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in this work, we present a systematic search for stellar groups in the taurus field by applying the dbscan algorithm to the data from gaia dr2. we find 22 groups, consisting of 8 young groups (groups 1-8) at ages of 2-4 myr and distances of ∼130-170 pc, and 14 old groups (groups 9-22) at ages of 8-49 myr and distances ... | the old moving groups in the field of taurus |
signatures of x-ray reprocessing (reflection) out of an accretion disk are commonly observed in the high-energy spectrum of accreting black holes, and can be used to probe the strong gravity region around these objects. in this paper, we extend previous work in the literature and we employ a full emission model for rel... | testing the kerr metric using x-ray reflection spectroscopy: spectral analysis of gx 339-4 |
warps are common features in both stellar and gaseous discs of nearby spiral galaxies with the latter usually easier to detect. several theories have been proposed in the literature to explain their formation and prevalence, including tidal interactions with external galaxies. observational correlations also suggest th... | tidally induced warps of spiral galaxies in illustristng |
the hunt is on for dozens of protoplanets hypothesized to reside in protoplanetary discs with imaged gaps. how bright these planets are, and what they will grow to become, depend on their accretion rates, which may be in the runaway regime. using 3d global simulations, we calculate maximum gas accretion rates for plane... | the maximum accretion rate of a protoplanet: how fast can runaway be? |
tidal disruption of stars in dense nuclear star clusters containing supermassive central black holes (smbh) is modeled by high-accuracy direct n-body simulation. stars getting too close to the smbh are tidally disrupted, and a tidal disruption event (tde) happens. the tdes probe the properties of smbhs, their accretion... | revisit the rate of tidal disruption events: the role of the partial tidal disruption event |
in order to evaluate the impacts made by super-eddington accretors on their environments precisely, it is essential to guarantee a large enough simulation box and long computational time to avoid any artefacts from numerical settings as much as possible. in this paper, we carry out axisymmetric two-dimensional radiatio... | large-scale outflow structure and radiation properties of super-eddington flow: dependence on the accretion rates |
context. tidal ring galaxies (trgs) are rarely observed in the local universe due to their intrinsically transient nature. the tidal ring structures are the result of strong interactions between gas-rich stellar disks and smaller galactic systems, and do not last longer than ∼500 myr. therefore, these are perfect scena... | a giant umbrella-like stellar stream around the tidal ring galaxy ngc 922 |
stars form from the gravitational collapse of turbulent, magnetized molecular cloud cores. our non-ideal mhd simulations reveal that the intrinsically anisotropic magnetic resistance to gravity during the core collapse naturally generates dense gravo-magneto-sheetlets within inner protostellar envelopes -- disrupted ve... | protostellar disks fed by dense collapsing gravo-magneto-sheetlets |
magnetorotational instability-driven (mri-driven) turbulence and dynamo phenomena are analyzed using direct statistical simulations. our approach begins by developing a unified mean-field model that combines the traditionally decoupled problems of the large-scale dynamo and angular momentum transport in accretion disks... | unified treatment of mean-field dynamo and angular-momentum transport in magnetorotational instability-driven turbulence |
the growth process of protoplanets can be sped up by accreting a large number of solid, pebble-sized objects that are still present in the protoplanetary disc. it is still an open question on how efficient this process works in realistic turbulent discs. we investigate the accretion of pebbles in turbulent discs that a... | particle accretion onto planets in discs with hydrodynamic turbulence |
context. recent alma observations suggest that the highest velocity part of molecular protostellar jets (≳80 km s-1) are launched from the dust-sublimation regions of the accretion disks (≲0.3 au). however, the formation and survival of molecules in inner protostellar disk winds, in the presence of a harsh far-ultravio... | molecule formation in dust-poor irradiated jets. i. stationary disk winds |
hot dust-obscured galaxies (hot dogs) are a population of hyper-luminous infrared galaxies identified by the wide-field infrared survey explorer (wise) mission from their very red mid-ir colors, and characterized by hot dust temperatures (t > 60 k). several studies have shown clear evidence that the ir emission in t... | hot dust obscured galaxies with excess blue light: dual agn or single agn under extreme conditions? |
according to various models, the orbital and the epicyclic frequencies of particles moving on a circular orbit around compact objects are related to the quasi-periodic oscillations observed in the x-ray flux of some pulsars or black hole candidates. it is expected that they originate from the inner edge of the accretio... | orbital and epicyclic frequencies around neutron and strange stars in r^2 gravity |
we use atacama large millimeter/submillimeter array co (2-1) observations of six low-redshift palomar-green quasars to study the distribution and kinematics of the molecular gas of their host galaxies at kiloparsec-scale resolution. while the molecular gas content, molecular gas fraction, and star formation rates are s... | compact molecular gas distribution in quasar host galaxies |
type-c quasi-periodic oscillations (qpos) in x-ray binaries have been often interpreted as a consequence of relativistic lense-thirring precession around a spinning black hole and they potentially offer a way to measure black hole spins and masses. the connection between relativistic precession and the resulting qpos h... | on the different flavours of lense-thirring precession around accreting stellar mass black holes |
geometrically thick tori with constant specific angular momentum have been widely used in the last decades to construct numerical models of accretion flows on to black holes. such discs are prone to a global non-axisymmetric hydrodynamic instability, known as papaloizou-pringle instability (ppi), which can redistribute... | papaloizou-pringle instability suppression by the magnetorotational instability in relativistic accretion discs |
we present a new monte carlo code for comptonisation in astrophysics (moca). to our knowledge moca is the first code that uses a single photon approach in a full special relativity scenario, and including also klein-nishina effects as well as polarisation. in this paper we describe in detail how the code works, and sho... | moca: a monte carlo code for comptonisation in astrophysics. i. description of the code and first results |
aims: we investigate accretion models for the newly discovered pulsating ultraluminous x-ray source (ulx) ngc 300 ulx1.methods: we analyzed broadband xmm-newton and nustar observations of ngc 300 ulx1, performing phase-averaged and phase-resolved spectroscopy. using the bayesian framework, we compared two physically mo... | investigating ulx accretion flows and cyclotron resonance in ngc 300 ulx1 |
the iron kα line commonly observed in the x-ray spectrum of both stellar-mass and supermassive black hole (bh) candidates originates from x-ray fluorescence of the inner accretion disk. accordingly, it can be used to map the spacetime geometry around these objects. in this paper, we extend previous work using the iron ... | testing the kerr nature of black hole candidates using iron line spectra in the cpr framework |
the existence of massive galaxies lacking a classical bulge has often been proposed as a challenge to λcdm. however, recent simulations propose that a fraction of massive disc galaxies might have had very quiescent merger histories, and also that mergers do not necessarily build classical bulges. we test these ideas wi... | ngc 5746: formation history of a massive disc-dominated galaxy |
diffuse ionized gas (dig) is an important component of the interstellar medium that can provide insights into the different physical processes affecting the gas in galaxies. we utilize optical ifu observations of 71 gas-stripped and control galaxies from the gas stripping phenomena in galaxies (gasp) survey, to analyze... | gasp xxxv: characteristics of the diffuse ionised gas in gas-stripped galaxies |
we modelled optical light curves of sco x-1 obtained by the kepler space telescope during the k2 mission. modelling was performed for the case of strong heating of the optical star and accretion disc by x-rays. in the model considered, the optical star fully filled its roche lobe. we investigated the inverse problem in... | parameters of the x-ray binary system scorpius x-1 |
we present a one-dimensional, local thermodynamic equilibrium homogeneous analysis of 132 stars observed at high resolution with espadons. this represents the largest sample observed at high resolution (r ~ 40 000) from the pristine survey. this sample is based on the first version of the pristine catalogue and covers ... | the pristine survey - xv. a cfht espadons view on the milky way halo and disc populations |
observations have shown that the disk frequency and the fraction of accreting pre-main-sequence stars decrease with the age of the population and that some stars appear to have disks while their accretion has stopped. still, it is unclear how disk-bearing stars stop their accretion. to provide insight into the last sta... | a census of the low accretors. i. the catalog |
we study x-ray and soft gamma-ray spectra from the hard state of the accreting black hole binary maxi j1820+070. we perform an analysis of joint spectra from hxmt, nustar, and integral. we find an overall agreement between the spectra from all three satellites. satisfactory fits to the data require substantial spectral... | insight-hxmt, nustar, and integral data show disk truncation in the hard state of the black hole x-ray binary maxi j1820+070 |
we analyse the evolution of the oxygen abundance gradient of star-forming galaxies with stellar mass ${\rm m_{\ast }}\ge 10^{9}\rm m_{\odot }$ in the eagle simulation over the redshift range z = [0, 2.5]. we find that the median metallicity gradient of the simulated galaxies is close to zero at all z, whereas the scatt... | the evolution of the oxygen abundance gradients in star-forming galaxies in the eagle simulations |
anomalies in semileptonic b-meson decays present interesting patterns that might be revealing the shape of the new physics to come. under the assumption that neutrino and charged lepton mass terms are the only sources of flavor violation and given the hierarchy between the two, we find that charged lepton universality ... | lepton universality violation with lepton flavor conservation in b-meson decays |
we study a flavor model with a4 symmetry which originates from s4 modular group. in s4 symmetry, z2 subgroup can be anomalous, and then s4 can be violated to a4. starting with a s4 symmetric lagrangian at the tree level, the lagrangian at the quantum level has only a4 symmetry when z2 in s4 is anomalous. we obtain modu... | new a4 lepton flavor model from s4 modular symmetry |
this is a review article about neutrino mass and mixing and flavour model building strategies based on modular symmetry. after an introduction to neutrino mass and lepton mixing, we then turn to the main subject of this review, namely a pedagogical introduction to modular symmetry as a candidate for family symmetry, fr... | neutrino mass and mixing with modular symmetry |
in this paper, we study the implications of the modular a4 flavor symmetry in constructing a supersymmetric minimal type-(i+ii) seesaw model, in which only one right-handed neutrino and two higgs triplets are introduced to account for the tiny neutrino masses, flavor mixing and cp violation. we consider the most econom... | lepton flavor mixing and cp violation in the minimal type-(i+ii) seesaw model with a modular a4 symmetry |
we explore alternative descriptions of the charged lepton sector in modular invariant models of lepton masses and mixing angles. in addition to the modulus, the symmetry breaking sector of our models includes ordinary flavons. neutrino mass terms depend only on the modulus and are tailored to minimize the number of fre... | modular invariant models of lepton masses at levels 4 and 5 |
we discuss the modular a4 invariant model of leptons combining with the generalized cp symmetry. in our model, both cp and modular symmetries are broken spontaneously by the vacuum expectation value of the modulus τ. the source of the cp violation is a non-trivial value of re[τ] while other parameters of the model are ... | spontaneous cp violation by modulus τ in a4 model of lepton flavors |
in the modular invariant flavor model of a4, we study the hierarchical structure of lepton/quark flavors at nearby fixed points of τ =i and τ =ω of the modulus, which are in the fundamental domain of psl (2 ,z ). these fixed points correspond to the residual symmetries z2s={i ,s } and z3s t={i ,s t ,(s t )2} of a4, whe... | modular invariant flavor model of a4 and hierarchical structures at nearby fixed points |
we show how quark and lepton mass hierarchies can be reproduced in the framework of modular symmetry. the mechanism is analogous to the froggatt-nielsen (fn) mechanism, but without requiring any abelian symmetry to be introduced, nor any standard model (sm) singlet flavon to break it. the modular weights of fermion fie... | fermion mass hierarchies from modular symmetry |
in modular-invariant models of flavour, hierarchical fermion mass matrices may arise solely due to the proximity of the modulus τ to a point of residual symmetry. this mechanism does not require flavon fields, and modular weights are not analogous to froggatt-nielsen charges. instead, we show that hierarchies depend on... | fermion mass hierarchies, large lepton mixing and residual modular symmetries |
we study quark and lepton mass matrices with the common modulus $\tau$ in the $a_4$ modular symmetry. the viable quark mass matrices are composed of modular forms of weights $2$, $4$ and $6$. it is remarked that the modulus $\tau$ is close to $i$, which is a fixed point in the fundamental region of sl$(2,z)$, and the c... | quark and lepton flavors with common modulus $\\tau$ in $a_4$ modular symmetry |
modular symmetry offers the possibility to provide an origin of discrete flavor symmetry and to break it along particular symmetry preserving directions without introducing flavons or driving fields. it is also possible to use a weighton field to account for charged fermion mass hierarchies rather than a froggatt-niels... | modular s4×s u (5 ) gut |
we study quark and lepton mass matrices in the $a_4$ modular symmetry towards the unification of the quark and lepton flavors. we adopt modular forms of weights $2$ and $6$ for quarks and charged leptons, while we use modular forms of weight $4$ for the neutrino mass matrix which is generated by the weinberg operator. ... | towards unification of quark and lepton flavors in $a_4$ modular invariance |
we consider a flavor model based on the a4 modular group to account for both lepton and quark parameters (masses and mixing). the inverse seesaw mechanism is considered to produce the light neutrino masses. lepton masses and mixing are obtained in terms of yukawa coupling ratios and values of the modulus τ nearby some ... | fermion masses and flavor mixing in modular a4 symmetry |
we analyze the neutrino mass spectrum and discuss the extra-dimensional interpretation of a three-site pati-salam model which i) unifies all families of quark and leptons, ii) provides a natural description of the standard model yukawa couplings, iii) could account for the recent b-physics anomalies. the key feature of... | flavor non-universal pati-salam unification and neutrino masses |
we study parameter degeneracies that can occur in long-baseline neutrino appearance experiments due to nonstandard interactions (nsi) in neutrino propagation. for a single off-diagonal nsi parameter, and neutrino and antineutrino measurements at a single l /e , there exists a continuous four-fold degeneracy (related to... | degeneracies in long-baseline neutrino experiments from nonstandard interactions |
we study the matter effect caused by nonstandard neutrino interactions (nsi) in the next generation long-baseline neutrino experiments, dune, t2hk and t2hkk. if multiple nsi parameters are nonzero, the potential of these experiments to detect cp violation, determine the mass hierarchy and constrain nsi is severely impa... | nonstandard neutrino interactions at dune, t2hk and t2hkk |
we discuss sensitivities to lepton flavor violating (and conserving) interactions at future muon colliders, especially at μ+μ+ colliders. compared with the searches for rare decays of μ and τ, we find that the tev-scale future colliders have better sensitivities depending on the pattern of hierarchy in the flavor mixin... | lepton flavor physics at μ+μ+ colliders |
we propose a gauged u(1) b - l extended two higgs doublet model to explain both neutrino mass and lepton anomalous magnetic moments (g - 2). neutrino mass is generated via an inverse seesaw mechanism by introducing singlet fermions. especially, we update the result of muon (g - 2) in light of the very recent report by ... | inverse seesaw and (g - 2) anomalies in b - l extended two higgs doublet model |
it is known that there are ads vacua obtained from compactifying the sm to 2 or 3 dimensions. the existence of such vacua depends on the value of neutrino masses through the casimir effect. using the weak gravity conjecture, it has been recently argued by ooguri and vafa that such vacua are incompatible with the sm emb... | constraining neutrino masses, the cosmological constant and bsm physics from the weak gravity conjecture |
neutrino event generators are an essential tool needed for the extraction of neutrino mixing parameters, the mass hierarchy and a cp violating phase from long-baseline experiments. in this article i first describe the theoretical basis and the approximations needed to get to any of the generators. i also discuss the st... | neutrino event generators: foundation, status and future |
we propose a one-loop induced radiative neutrino mass model with anomaly free flavour dependent gauge symmetry: μ minus τ symmetry u(1) μ- τ . a neutrino mass matrix satisfying current experimental data can be obtained by introducing a weak isospin singlet scalar boson that breaks u(1) μ- τsymmetry, an inert doublet sc... | flavour dependent gauged radiative neutrino mass model |
we propose two different seesaw models namely, type i and inverse seesaw to realise light dirac neutrinos within the framework of a4 discrete flavour symmetry. the additional fields and their transformations under the flavour symmetries are chosen in such a way that naturally predicts the hierarchies of different eleme... | a4 flavour model for dirac neutrinos: type i and inverse seesaw |
we explore the possibility that the semi-leptonic b decay ratios {r}_{k^{(*)}} which violate μ - e universality are related to the origin of the fermion yukawa couplings in the standard model. some time ago, a vector-like fourth family (without a z') was used to generate fermion mass hierarchies and mixing patterns wit... | {r}_{k^{(*)}} and the origin of yukawa couplings |
quasielastic neutrino scattering is an important aspect of the experimental program to study fundamental neutrino properties including neutrino masses, mixing angles, mass hierarchy, and charge-conjugation parity (cp)- violating phase. proper interpretation of the experiments requires reliable theoretical calculations ... | quantum monte carlo calculation of neutral-current ν -12c inclusive quasielastic scattering |
we propose a linear seesaw model to realise light dirac neutrinos within the framework of a4 discrete flavour symmetry. the additional fields and their transformations under the flavour symmetries are chosen in such a way that naturally predicts the hierarchies of different elements of the seesaw mass matrix and also k... | linear seesaw for dirac neutrinos with a4 flavour symmetry |
we discuss a linear seesaw model with a field content as minimum as possible, introducing a modular $ s_4 $ using gauged $ u(1)_{b-l} $ symmetries. owing to the rank two neutrino mass matrix, we obtain a vanishing neutrino mass eigenvalue, and only the normal mass hierarchy of neutrinos is favored via the modular $ s_4... | linear seesaw model with a modular s 4 flavor symmetry |
we study a zee model applying a modular $a_4$ symmetry, where we construct our lepton model as minimum modular weight as possible. we show our predictions on phases and neutrino masses through our $\delta \chi^2$ analysis. we find that normal hierarchy is favored, and $\tau$ is localized to 2.3$i$ that is close to a fi... | zee model in a modular $a_4$ symmetry |
we propose a supersymmetric radiative seesaw model with modular $a_4$ symmetry. thanks to contributions of supersymmetric partners to one-loop diagrams generating neutrino masses, we successfully fit neutrino data and obtain predictions in case of normal hierarchy in a minimal framework that would not be realized in a ... | a radiative seesaw model in a supersymmetric modular $a_4$ group |
this paper reports the first measurement using the nova detectors of νμ disappearance in a νμ beam. the analysis uses a 14 kton-equivalent exposure of 2.74 ×1020 protons-on-target from the fermilab numi beam. assuming the normal neutrino mass hierarchy, we measure δ m322=(2.52-0.18+0.20)×10-3 ev2 and sin2θ23 in the ran... | first measurement of muon-neutrino disappearance in nova |
we investigate the implications of one light ev scale sterile neutrino on the physics potential of the proposed long-baseline experiment dune. if the future short-baseline experiments confirm the existence of sterile neutrinos, then it can affect the mass hierarchy (mh) and cp-violation (cpv) searches at dune. the mh s... | physics reach of dune with a light sterile neutrino |
we investigate the viability of predictive schemes for quark-lepton yukawa ratios and nucleon decay in non-supersymmetric su(5) grand unified theories (guts) where neutrino masses are generated by a type ii seesaw mechanism. the scalar sector of the considered scenario contains 5-, 24- and 45-dimensional representation... | viable quark-lepton yukawa ratios and nucleon decay predictions in su(5) guts with type-ii seesaw |
we propose a viable theory based on the s u (3 )c×s u (3 )l×u (1 )x gauge group supplemented by the s4 discrete group together with other various symmetries, whose spontaneous breaking gives rise to the current standard model (sm) fermion mass and mixing hierarchy. in the proposed theory the small light active neutrino... | fermion masses and mixings and some phenomenological aspects of a 3-3-1 model with linear seesaw mechanism |
we propose a renormalizable theory based on the $su(3)_c\times su(3)_l\times u(1)_x$ gauge symmetry, supplemented by the spontaneously broken $u(1)_{l_g}$ global lepton number symmetry and the $s_3 \times z_2 $ discrete group, which successfully describes the observed sm fermion mass and mixing hierarchy. in our model ... | fermion spectrum and $g-2$ anomalies in a low scale 3-3-1 model |
in this work, we have proposed a modular a4 symmetric model of neutrino mass which, simultaneously, explains observed baryon asymmetry of the universe (bau). in minimal extension of the standard model (sm) with two right-handed neutrinos we work in a supersymmetric framework. at type-i seesaw level, the model predicts ... | broken scaling neutrino mass matrix and leptogenesis based on a4 modular invariance |
we discuss gauge models incorporating μ-τ flavored cp symmetry (called cp μτin the text) in combination with lμ- lτinvariance to understand neutrino mixings and discuss their phenomenological implications. we show that viable leptogenesis in this setting requires that the lightest right-handed neutrino mass must be bet... | implications of μ- τ flavored cp symmetry of leptons |
we propose a two-higgs-doublet model where the symmetry is extended by s3⊗z3⊗z3'⊗z14 and the field content is enlarged by extra s u (2 )l singlet scalar fields. s3 makes the model predictive and leads to viable fermion masses and mixing. the observed hierarchy of the quark masses arises from the z3' and z14 symmetries.... | fermion and scalar phenomenology of a two-higgs-doublet model with s3 |
it was recently proposed that the electroweak hierarchy problem is absent if the generation of the higgs potential stems exclusively from quantum effects of heavy right-handed neutrinos which can also generate active neutrino masses via the type-i seesaw mechanism. hence, in this framework dubbed the "neutrino option,"... | conformal realization of the neutrino option |
in this addendum we complement the remarks made in ref[1] constraining the value of the cosmological constant $\lambda_4$ in terms of neutrino masses. those were based on a sharpened version of the weak gravity conjecture as applied to compactifications of the sm to lower dimensions. we argue that the same line of reas... | constraining the ew hierarchy from the weak gravity conjecture |
the two long-baseline experiments t2k and no νa have recently presented new findings. t2k has shown the first νbare appearance data while no νa has released the first νe appearance results. these data are of particular importance because they allow us to probe for the first time in a direct (or manifest) way the lepton... | 3-flavor and 4-flavor implications of the latest t2k and noνa electron (anti-)neutrino appearance results |
in this paper we discuss $su(5)^{3}$ with cyclic symmetry as a possible grand unified theory (gut). the basic idea of such a tri-unification is that there is a separate $su(5)$ for each fermion family, with the light higgs doublet(s) arising from the third family $su(5)$, providing a basis for charged fermion mass hier... | tri-unification: a separate $su(5)$ for each fermion family |
we show that a conformal extension of the standard model with local b -l symmetry and two complex scalars breaking b -l can provide a unified description of neutrino mass, origin of matter, and dark matter. there are two hierarchical b -l breaking vacuum expectation value (vev) scales in the model, the higher denoted b... | conformal b -l and pseudo-goldstone dark matter |
we propose an extension of the three-higgs-doublet model (3hdm), where the standard model (sm) particle content is enlarged by the inclusion of two inert su2l scalar doublets, three inert and two active electrically neutral gauge singlet scalars, charged vector like fermions and majorana neutrinos. these additional par... | fermion mass hierarchy and g − 2 anomalies in an extended 3hdm model |
after the higgs boson discovery, it was established that the higgs mechanism explains electroweak symmetry breaking and generates the masses of all particles in the standard model, with the possible exception of neutrino masses. the hierarchies among fermion masses and mixing angles, however, remain unexplained. we pro... | creating the fermion mass hierarchies with multiple higgs bosons |
we propose a non-minimal left-right symmetric model with parity symmetry where the fermion mixings arise as a result of imposing an s3⊗ z2 flavor symmetry, and an extra ze2 symmetry is considered in the lepton sector. then the neutrino mass matrix possesses approximately the μ -τ symmetry. the breaking of the μ -τ symm... | non-minimal flavored {s}3⊗ {z}2 left-right symmetric model |
we study the impact of one light sterile neutrino on the prospective data expected to come from the two presently running long-baseline experiments t2k and no va when they will accumulate their full planned exposure. introducing for the first time, the bi-probability representation in the 4-flavor framework, commonly u... | discovery potential of t2k and no va in the presence of a light sterile neutrino |
we consider a 4-higgs-doublet model in which each higgs doublet gives mass to one of the fermion sets {mt}, {mb, mτ, mc}, {mμ, ms}, and {md, mu, me}. the sets have the feature that within each of them the masses are similar. our model explains the mass hierarchies of the sets by hierarchies of the vacuum expectation va... | multi-higgs-doublet models and singular alignment |
the minimal type i seesaw model cannot explain the observed neutrino masses and the baryon asymmetry of the universe via hierarchical thermal leptogenesis without ceding naturalness. we show that this conclusion can be avoided by adding a second higgs doublet with tan β ≳4 . the models considered naturally accommodate ... | natural leptogenesis and neutrino masses with two higgs doublets |
we propose a renormalizable theory based on the s u (3) c×s u (3) l×u (1) x gauge symmetry, supplemented by the spontaneously broken u (1) l g global lepton number symmetry and the s3×z2 discrete group, which successfully describes the observed sm fermion mass and mixing hierarchy. in our model the top and exotic quark... | fermion spectrum and g -2 anomalies in a low scale 3-3-1 model |
we consider the feasibility of interpreting the r k (*) anomaly in the colored zee-babu model. the model generates neutrino masses at two loops with the help of a scalar leptoquark s ∼ (3 , 3 , - 1/3) and a scalar diquark ω ∼ (6 , 1 , - 2/3), and contributes to the transition b → sℓ-ℓ+ via the exchange of a leptoquark ... | interpreting the r k (*) anomaly in the colored zee-babu model |
this letter reports new results on muon neutrino disappearance from nova, using a 14 kton detector equivalent exposure of 6.05 ×1 020 protons on target from the numi beam at the fermi national accelerator laboratory. the measurement probes the muon-tau symmetry hypothesis that requires maximal θ23 mixing (θ23=π /4 ). a... | measurement of the neutrino mixing angle θ23 in nova |
we perform a comprehensive analysis of the most distinctive and important phenomenological implications of the recently proposed mechanism of sequential loop generation of strong hierarchies in the standard model (sm) fermion mass spectra. this mechanism is consistently realized at the level of renormalizable interacti... | phenomenology of an extended idm with loop-generated fermion mass hierarchies |
this letter reports new results on muon neutrino disappearance from nova, using a 14 kton detector equivalent exposure of $6.05\times10^{20}$ protons-on-target from the numi beam at the fermi national accelerator laboratory. the measurement probes the muon-tau symmetry hypothesis that requires maximal mixing ($\theta_{... | measurement of the neutrino mixing angle $\\theta_{23}$ in nova |
the vanishing of the higgs quartic coupling of the standard model at high energies may be explained by spontaneous breaking of higgs parity. taking higgs parity to originate from the left-right symmetry of the so(10) gauge group, leads to a new scheme for precision gauge coupling unification that is consistent with pro... | higgs parity grand unification |
jiangmen underground neutrino observatory (juno) is a next generation liquid scintillator neutrino experiment under construction phase in south china. thanks to the anti-neutrinos produced by the nearby nuclear power plants, juno will be able to study the neutrino mass hierarchy, one of the open key questions in neutri... | embedded readout electronics r&d for the large pmts in the juno experiment |
it has been recently argued that an embedding of the sm into a consistent theory of quantum gravity may imply important constraints on the mass of the lightest neutrino and the cosmological constant λ4. the constraints come from imposing the absence of any non-susy ads stable vacua obtained from any consistent compacti... | ads-phobia, the wgc, the standard model and supersymmetry |
compactifying the sm down to 3d or 2d one may obtain ads vacua depending on the neutrino mass spectrum. it has been recently shown that, by insisting in the absence of these vacua, as suggested by weak gravity conjecture (wgc) arguments, intriguing constraints on the value of the lightest neutrino mass and the 4d cosmo... | the fundamental need for a sm higgs and the weak gravity conjecture |
we present a mechanism that addresses the electroweak, the strong cp, and the flavor hierarchies of the standard model (including neutrino masses) in a unified way. the naturalness of the electroweak scale is solved together with the strong cp problem by the nelson-barr relaxion: the relaxion field is identified with t... | the hierarchion, a relaxion addressing the standard model's hierarchies |
we revisit the a_4 model for leptons in light of the new result of nufit 3.2. we introduce a new flavon η transforming as an a_4 singlet 1' or 1'', which couples to both charged leptons and neutrinos in next-to-leading-order operators. the model consists of five parameters: the lightest neutrino mass m_1, the vacuum ex... | revisiting the a4 model for leptons in light of nufit 3.2 |
we study the minimal seesaw model, where two right-handed majorana neutrinos are introduced, focusing on the cp violating phase. in addition, we take the trimaximal mixing pattern for the neutrino flavor where the charged lepton mass matrix is diagonal. owing to this symmetric framework, the 3 × 2 dirac neutrino mass m... | towards the minimal seesaw model via cp violation of neutrinos |
we consider the generation of neutrino masses via a singly-charged scalar singlet. under general assumptions we identify two distinct structures for the neutrino mass matrix. this yields a constraint for the antisymmetric yukawa coupling of the singly-charged scalar singlet to two left-handed lepton doublets, irrespect... | the singly-charged scalar singlet as the origin of neutrino masses |
in this paper, we consider the possibility of generating the observed baryon asymmetry of the universe via leptogenesis in the context of a triplet fermion-mediated type-iii seesaw model of neutrino mass. with a hierarchical spectrum of the additional fermions, the lower bound on the lightest triplet mass is ∼1010 gev ... | lowering the scale of fermion triplet leptogenesis with two higgs doublets |
we present theories of "natural neutrinos" in which neutral fermionic top partner fields are simultaneously the right-handed neutrinos (rhn), linking seemingly disparate aspects of the standard model structure: (a) the rhn top partners are responsible for the observed small neutrino masses, (b) they help ameliorate the... | neutrino masses from neutral top partners |
in this work, we derive a quantum information theoretic quantity similar to the leggett-garg inequality, which can be defined in terms of neutrino transition probabilities. for the case of νμ →νe /νbarμ →νbare transitions, this quantity is sensitive to cp violating effects as well as the neutrino mass-hierarchy, namely... | a quantum information theoretic quantity sensitive to the neutrino mass-hierarchy |
we investigate the performance of t2hk in the presence of a light ev scale sterile neutrino. we study in detail its influence in resolving fundamental issues like mass hierarchy, cp-violation (cpv) induced by the standard cp-phase δ 13 and new cp-phase δ 14, and the octant ambiguity of θ 23. we show for the first time ... | signatures of a light sterile neutrino in t2hk |
we study a second cp symmetry compatible with the a4 flavor group, which interchanges the representations 1‧ and 1″. we analyze the lepton mixing patterns arising from the a4 and cp symmetry broken to residual subgroups z3 and z2 × cp in the charged lepton and neutrino sectors respectively. one phenomenologically viabl... | a4 and cp symmetry and a model with maximal cp violation |
we study the cp violation in the deviation from the tri-bimaximal (tbm) mixing of neutrinos. we examine nontrivial relations among the mixing angles and the cp violating dirac phase in the typical four cases of the deviation from the tbm. the first two cases are derived by the additional rotation of the 2-3 or 1-3 gene... | predicting cp violation in deviation from tri-bimaximal mixing of neutrinos |
we propose a natural s 4 × so(10) supersymmetric grand unified theory of flavour with an auxiliary z_4^2× z_4^r symmetry, based on small higgs representations (nothing larger than an adjoint) and hence a type-i seesaw mechanism. the yukawa structure of all fermions is determined by the hierarchical vacuum expectation v... | a natural s 4 × so(10) model of flavour |
we describe a minimal extension of the standard model (sm) by three right-handed neutrinos, a scalar doublet, and a scalar singlet (the "ν dfsz ") which serves as an existence proof that weakly coupled high-scale physics can naturally explain phenomenological shortcomings of the sm. the ν dfsz can explain neutrino mass... | technically natural nonsupersymmetric model of neutrino masses, baryogenesis, the strong c p problem, and dark matter |
we study the minimal type-iii seesaw model in which we extend the standard model by adding two s u (2 )l triplet fermions with zero hypercharge to explain the origin of the nonzero neutrino masses. we show that the naturalness conditions and the limits from lepton flavor violating decays provide very stringent bounds o... | constraining the minimal type-iii seesaw model with naturalness, lepton flavor violation, and electroweak vacuum stability |
we propose a complex extension of μτ permutation antisymmetry in the neutrino majorana matrix mν . the latter can be realized for the lagrangian by appropriate cp transformations on the neutrino fields. the resultant form of mνis shown to be simply related to that with a complex (cp) extension of μτ permutation symmetr... | consequences of minimal seesaw with complex μτ antisymmetry of neutrinos |
neutrinos are the fundamental particles, blind to all kind of interactions except the weak and gravitational. hence, they can propagate very long distances without any deviation. this characteristic property can thus provide an ideal platform to investigate planck suppressed physics through their long distance propagat... | exploring the effect of lorentz invariance violation with the currently running long-baseline experiments |
we propose an extension of the three-higgs-doublet model (3hdm), where the standard model (sm) particle content is enlarged by the inclusion of two inert $su_{2l}$ scalar doublets, three inert and two active electrically neutral gauge singlet scalars, charged vector like fermions and majorana neutrinos. these additiona... | fermion mass hierarchy and g-2 anomalies in an extended 3hdm model |
we make a scalar extension of the b-l gauge model where the s3 non-abelian discrete group drives mainly the yukawa sector. motived by the large and small hierarchies among the quark and active neutrino masses, respectively, the quark and lepton families are not treated on the same footing under the assignment of the di... | b-l model with s3 symmetry |
we propose a multiscalar singlet extension of the singlet-triplet higgs model capable of explaining the sm fermion mass spectrum and mixing parameters. our model is based on the δ (27) family symmetry, supplemented by cyclic symmetries, which are spontaneously broken thus yielding the observed hierarchy of the sm charg... | δ(27) flavor singlet-triplet higgs model for fermion masses and mixings |
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