We propose a type II seesaw model for light Dirac neutrinos to provide an explanation the recently reported anomaly in W boson mass by CDF collaboration with 7σ statistical significance. In minimal model, required enhancement is obtained at tree level due vacuum expectation value of real scalar triplet, which also plays role generating neutrino mass. Depending upon couplings and masses newly introduced particles, we can have thermally or non-thermally generated relativistic degrees freedom...

Motivated by the recently reported anomaly in W boson mass CDF collaboration with $7σ$ statistical significance, we consider a singlet-doublet (SD) Majorana fermion dark matter (DM) model where required correction to arises from radiative corrections induced SD fermions. While single generation of fermions, odd under an unbroken $Z_2$ symmetry, can not explain while being consistent DM phenomenology, two generations fermions do so heavier playing dominant role W-mass and lighter...

We study a scotogenic extension of the minimal gauged ${L}_{\ensuremath{\mu}}\ensuremath{-}{L}_{\ensuremath{\tau}}$ model including three right-handed singlet fermions and scalar doublet all odd under an in-built ${Z}_{2}$ symmetry to explain anomalous magnetic moments muon, CDF-II $W$-mass anomaly, 95 GeV excess reported by CMS collaboration. While can successfully muon ($g\ensuremath{-}2$) anomalies, required diphoton signal strength for scalar, together with that SM Higgs, cannot be...

We propose a new realization of light Dirac neutrino mass and dark matter (DM) within the framework non-Abelian discrete flavor symmetry based on <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msub><a:mi>A</a:mi><a:mn>4</a:mn></a:msub></a:math> group. In addition to <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:msub><c:mi>A</c:mi><c:mn>4</c:mn></c:msub></c:math>, we also consider <e:math xmlns:e="http://www.w3.org/1998/Math/MathML"...

We study an extension of the minimal gauged ${L}_{\ensuremath{\mu}}\ensuremath{-}{L}_{\ensuremath{\tau}}$ model including three right-handed singlet fermions and a scalar doublet to explain anomalous magnetic moments muon electron simultaneously. The presence in-built ${Z}_{2}$ symmetry under which $\ensuremath{\eta}$ are odd, gives rise stable dark matter candidate along with light neutrino mass in scotogenic fashion. In spite possibility having positive negative contributions...

Motivated by the recently reported excess in electron recoil events XENON1T collaboration, we propose an inelastic fermion dark matter (DM) scenario within framework of a gauged $L_{\mu}-L_{\tau}$ extension standard model which can also accommodate tiny neutrino masses as well anomalous muon magnetic moment $(g-2)_{\mu}$. A Dirac DM, naturally stabilised due to its chosen gauge charge, is split into two pseudo-Dirac mass eigenstates Majorana term induced singlet scalar takes part generating...

Motivated by the growing evidence for lepton flavour universality violation after first results from Fermilab's muon (g−2) measurement, we revisit one of most widely studied anomaly free extensions standard model namely, gauged Lμ−Lτ model, known to be providing a natural explanation (g−2). We also incorporate presence dark matter (DM) in this order explain recently reported electron recoil excess XENON1T collaboration. show that same neutral gauge boson responsible generating required can...

In this article, we investigate the stochastic gravitational waves (GWs) spectrum, resulting from emission of gravitons through bremsstrahlung, in decay particles produced by Hawking radiation. Although particle decays inevitably entail graviton due to associated width is notably suppressed Planck scale suppression coupling matter fields gravitons. Consequently, relic abundance such GWs constituted these undergoes a corresponding reduction. However, demonstrate that super-heavy particles,...

We propose a simple model in the type-III seesaw framework to explain neutrino mass, asymmetric dark matter (DM), and baryon asymmetry of Universe. extend Standard Model with vectorlike singlet lepton (<a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>χ</a:mi></a:math>) hypercharge zero scalar triplet (<c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mi mathvariant="normal">Δ</c:mi></c:math>) addition three fermions (<f:math...

We study the possibility of light Dirac neutrino portal dark matter (DM) in an effective field theory (EFT) setup. nature automatically includes its right chiral part $\nu_R$ which, our setup, also acts like a between DM and standard model (SM) particles. Considering fermion singlet stabilised by unbroken $Z_2$ symmetry, we write down all possible dimension-6 operators involving DM-$\nu_R$ as well $\nu_R$-SM which conserve $Z_2$, global lepton number SM gauge symmetries. thermalisation...

We propose a self-interacting dark matter (DM) scenario with right handed neutrino (RHN) portal to the standard model (SM). The sector consists of particle DM, assumed be Dirac fermion, and light mediator in terms Abelian vector boson give rise required velocity dependent self-interactions agreement astrophysical observations. Irrespective thermal or non-thermal production such its final relic remains under-abundant due efficient annihilation rates DM into mediators by virtue large...

We propose a self-interacting inelastic dark matter (DM) scenario as possible origin of the recently reported excess electron recoil events by XENON1T experiment. Two quasi-degenerate Majorana fermion DM interact within themselves via light hidden sector massive gauge boson and with standard model particles kinetic mixing. also consider an additional long-lived singlet scalar which helps in realising correct relic abundance hybrid setup comprising both freeze-in freeze-out mechanisms. While...

Self-interacting dark matter (SIDM) with a light mediator is promising scenario to alleviate the small-scale problems of cold paradigm while being consistent latter at large scales, as suggested by astrophysical observations. This, however, leads an under-abundant SIDM relic due annihilation rates into particles, often requiring extension simplest thermal or non-thermal generation mechanism. In this work, we consider singlet-doublet fermion where singlet scalar gives rise velocity-dependent...

We propose a hybrid scoto-seesaw model based on the <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msub><a:mi>A</a:mi><a:mn>4</a:mn></a:msub><a:mo>×</a:mo><a:msub><a:mi>Z</a:mi><a:mn>4</a:mn></a:msub><a:mo>×</a:mo><a:msub><a:mi>Z</a:mi><a:mn>3</a:mn></a:msub><a:mo>×</a:mo><a:msub><a:mi>Z</a:mi><a:mn>2</a:mn></a:msub></a:math> non-Abelian discrete flavor symmetry. Light neutrino masses come from tree-level type-I seesaw mechanism, and one-loop scotogenic contribution...

We study the possibility of generating dark matter (DM) and baryon asymmetry Universe (BAU) simultaneously in an asymmetric DM framework, which also alleviates small-scale structure issues cold DM. While thermal relic such self-interacting remains underabundant due to efficient annihilation into light mediators, a nonzero sector can lead survival required Universe. The existence mediator leads self-interactions at small scales while keeping properties similar large scales. It ensures that...

We present a self-interacting boosted dark matter (DM) scenario as possible explanation of the recently reported excess electron recoil events by XENON1T experiment. The Standard Model (SM) has been extended with two vector-like fermion singlets charged under $U(1)_D$ gauge symmetry to describe sector. While presence light vector boson mediator leads sufficient DM self-interactions address small scale issues cold matter, model sub-GeV can explain via elastic scattering component electrons at...

Light dark matter (DM) in the GeV ballpark faces weaker constraint from direct detection experiments. If such DM also has sufficient self-interactions due to a light mediator, it can alleviate small-scale problems of cold (CDM) paradigm while being consistent with latter at large scales, as suggested by astrophysical observations. However, generating correct thermal relic for is challenging. While scale CDM typically leads overproduction absence annihilation channels, self-interacting (SIDM)...

We propose a type II seesaw model for light Dirac neutrinos to provide an explanation the recently reported anomaly in W boson mass by CDF collaboration with $7σ$ statistical significance. In minimal model, required enhancement is obtained at tree level due vacuum expectation value of real scalar triplet, which also plays role generating neutrino mass. Depending upon couplings and masses newly introduced particles, we can have thermally or non-thermally generated relativistic degrees freedom...

In an endeavor to explain the light neutrino masses and dark matter (DM) simultaneously, we study a gauged $U(1)_{\rm B-L}$ extension of standard model (SM). The are generated through variant type-II seesaw mechanism in which one scalar triplets has mass scale that is accessible at present generation colliders. Three SM singlet right chiral fermions $\chi_{iR}$($i=e,\mu,\tau$) with $\rm B-L$ charges -4, +5 invoked cancel gauge anomalies lightest among these three becomes viable DM candidate...

We propose a novel and minimal framework where light scalar field can give rise to dark matter (DM) self-interactions, while enhancing the CP symmetry required for successful baryon asymmetry of Universe via leptogenesis route. For demonstration purpose we choose work in scotogenic seesaw scenario lightest among right handed neutrinos (RHN), introduced generating neutrino masses radiatively, play role DM heavier two non-trivial roles relic as well lepton asymmetry. While self-interactions...

In this paper, we put forward a connection between the self-interacting dark matter and Dirac nature of neutrinos. Our exploration involves <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msub><a:mi>Z</a:mi><a:mn>4</a:mn></a:msub><a:mo stretchy="false">⊗</a:mo><a:msubsup><a:mi>Z</a:mi><a:mn>4</a:mn><a:mo>′</a:mo></a:msubsup></a:math> discrete symmetry, wherein neutrino mass is produced through type-I seesaw mechanism. This symmetry not only contributes to generation...

A bstract We study the possibility of generating light Dirac neutrino mass via scotogenic mechanism where singlet-doublet fermion Dark Matter (DM) plays non-trivial role in one-loop mass, anomalous magnetic moment muon: ( g − 2) μ as well additional relativistic degrees freedom ∆ N eff within reach cosmic microwave background (CMB) experiments. show that nature neutrinos can bring interesting correlations parameter space satisfying , DM relic density and effective . While we stick to thermal...

Abstract In this article, we investigate the stochastic gravitational waves (GWs) spectrum, resulting from emission of gravitons through bremsstrahlung, in decay particles produced by Hawking radiation. Although particle decays inevitably entail graviton due to associated width is notably suppressed Planck scale suppression coupling matter fields gravitons. Consequently, relic abundance such GWs constituted these undergoes a corresponding reduction. However, demonstrate that super-heavy...

We propose a novel and comprehensive particle physics framework that addresses multiple cosmological tensions observed in recent measurements of the Hubble parameter, $S_8$, Lyman-$\alpha$ forest data. Our model, termed `{\bf SIDR$+\boldsymbol{z_t}$}' (Self Interacting Dark Radiation with transition redshift), is based on an inelastic dark matter (IDM) scenario coupled radiation, governed by $U(1)_D$ gauge symmetry. This naturally incorporates cold (DM), strongly interacting radiation...