We investigate constraints on neutrino nonstandard interactions (NSIs) in the effective field theory framework, using data from first measurement of solar <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mmultiscripts><a:mrow><a:mi mathvariant="normal">B</a:mi></a:mrow><a:mprescripts/><a:none/><a:mrow><a:mn>8</a:mn></a:mrow></a:mmultiscripts></a:mrow></a:math> neutrinos via coherent elastic neutrino-nucleus scattering (<d:math...

We study the impact of mixing (LR mixing) between standard model $W$ boson and its hypothetical, heavier right-handed parter ${W}_{R}$ on neutrinoless double beta decay ($0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ decay) rate. Our is done in minimal left-right symmetric assuming a type-II dominance scenario with charge conjugation as symmetry. then show that $0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ rate may be dominated by contribution proportional to this LR...

A coupling of a dark photon $A'$ from $U(1)_{A'}$ with the standard model (SM) particles can be generated through kinetic mixing represented by parameter $\epsilon$. non-zero $\epsilon$ also induces between and $Z$ if mass $m_{A'}$ is not zero. This large when close to $m_Z$ even small. Many efforts have been made constrain for low compared boson $m_Z$. We study search in $e^+e^- \to \gamma A' \mu^+ \mu^-$ as kinematically allowed at future $e^+e^-$ colliders. For $m_{A'}$, care should taken...

A weak singlet charged scalar exists in many new physics models beyond the Standard Model. In this work, we show that a light with mass above 65 GeV is still allowed by LEP and LHC data. The interactions of Model particles are described operators up to dimension 5. Dominant decay modes obtained, subtlety involving field redefinition gauge fixing due dimension-5 operator also clarified. We demonstrate it promising observe at LHC.

A new U(1)X gauge boson field X can have renormalizable kinetic mixing with the standard model (SM) U(1)Y Y. This induces interactions of SM particles even though starts as a dark photon without such interactions. If is not broken, both and are massless. One cannot determine which one them physical or by just looking at terms in Lagrangian. We revisit this issue show explicitly that when all contributions included, processes do depend on basis used effects up electromagnetic weak if only...

We introduce a scenario for $CP$-violating (CPV) dark photon interactions in the context of non-Abelian kinetic mixing. Assuming an effective field theory that extends Standard Model (SM) content with additional $U(1)$ gauge boson ($X$) and $SU(2{)}_{L}$ triplet scalar, we show there exist both $CP$-conserving CPV dimension five operators involving these new degrees freedom SM bosons. The former yields mixing between $X$ neutral (yielding photon), while latter induces particles. discuss...

A bstract We investigate neutrinoless double beta (0 νββ ) decay rates in minimal left-right symmetric models presence of relatively light right-handed neutrinos. By use an effective field theory approach, we systematically include all contributions the model as well dependence amplitude on masses In type-I and type-II seesaw scenarios, analyze impact neutrinos heavier than about 10 MeV, showing that this effect can lead to a detection 0 next-generation experiments even for normal hierarchy...

We investigate the quark-level effective operators related to neutrinoless double beta <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mo stretchy="false">(</a:mo><a:mn>0</a:mn><a:mi>ν</a:mi><a:mi>β</a:mi><a:mi>β</a:mi><a:mo stretchy="false">)</a:mo></a:math> decay process and their ultraviolet completions relevant chiral enhancement effects at hadronic level. have classified several kinds of leptoquark models, matching different standard model operators. Assuming...

In certain new physics scenarios, a singly charged Higgs boson can couple to both fermions and $W^\pm Z$ at tree level. We develop strategies beyond current experimental searches using $pp\to jjH^\pm$, $H^\pm \to tb $ the Large Hadron Collider (LHC). With effective W^\mp tb$ couplings we perform model-independent analysis collision energy $\sqrt{s}=13$~TeV with integrated luminosity of $3~\text{ab}^{-1}$. derive discovery prospects exclusion limits for in mass range from 200~GeV 1~TeV....

We consider the strangeness-changing decays of hyperons into another baryon and missing energy which is carried away by a pair invisible spinless bosons. Pursuing model-independent approach taking account constraints from kaon sector, we find that these hyperon modes can have large rates, especially if bosons parity-odd effective couplings to light quarks. In case rates could attain values are well within expected reach currently running BESIII experiment. Since branching fractions with tiny...

A bstract For a generic Higgs boson, measuring the relative sign and magnitude of its couplings with W Z bosons is essential in determining origin. Such test also indispensable for 125-GeV boson. We propose that ratio HW HZZ λ can be directly determined through + − H production, where denotes owing to tree-level interference effect. While this impractical at LHC due limited sensitivity, it done future e colliders, such as 500-GeV ILC beam polarization P ( , ) = (−0 . 8 +0 3) jjℓ ± bb ℓ ∓ jj...

We demonstrate how probes of $CP$-violating observables in Higgs boson ditau decays at prospective future lepton colliders could provide a test weak scale baryogenesis with significant discovery potential. Measurements the Circular Electron Positron Collider, for example, exclude $CP$ phase larger than 2.9\ifmmode^\circ\else\textdegree\fi{} (5.6\ifmmode^\circ\else\textdegree\fi{}) 68% (95%) C.L. assuming Standard Model value magnitude tau Yukawa coupling. Conversely, this sensitivity would...

We suggest that the forward-backward asymmetry $({A}_{FB})$ of charged leptons in $gg\ensuremath{\rightarrow}H\ensuremath{\rightarrow}\ensuremath{\gamma}Z\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\ell}}^{\ensuremath{-}}{\ensuremath{\ell}}^{+}$ process could be used to probe $CP$-violating $H\ensuremath{\gamma}Z$ coupling when interference from...

$\Delta L =2$ lepton number violation (LNV) at the TeV scale could provide an alternative interpretation of positive signal(s) in future neutrinoless double beta $(0\nu\beta\beta)$ decay experiments. An interesting class models from this point view are those that low energies give rise to dimension-9 vector operators and a dimension-7 operator, both whose $0\nu\beta\beta$-decay rates "chirally suppressed". We study compare sensitivities experiments LHC searches simplified model TeV-scale LNV...

The search for singlet fermion dark matter at high-energy colliders is commonly analyzed with a scalar mediator, which however violates the standard model (SM) gauge invariance, renormalizability and unitarity. These problems can be cured by introducing mixing between $s$ SM Higgs boson $h$. Thus one has to consider two mediators ${h}_{1}$ ${h}_{2}$, where identified as discovered 125 GeV boson. As specific example, we (DM) in $t\overline{t}+{\overline{)E}}_{T}$ channel. According masses of...

A weak singlet charged scalar exists in many new physics models beyond the standard model. The discovery potential of is explored at future lepton colliders, e.g., CEPC, ILC-350, and ILC-500. We demonstrate that one can discover up to 118 GeV CEPC with an integrated luminosity $5\text{ }\text{ }{\mathrm{ab}}^{\ensuremath{-}1}$. At ILC-350 ILC-500 $1\text{ }{\mathrm{ab}}^{\ensuremath{-}1}$ such a limit be further improved 136 160 GeV, respectively.

We study the complementary tests of lepton number violation in $0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$-decay experiments, long-lived particle (LLP) searches at LHC main detectors ATLAS/CMS, and a proposed far detector MATHUSLA. In context simplified model with scalar doublet $S$ Majorana fermion $F$, we show that while experiments can probe larger portion parameter space, LLP uniquely region smaller couplings masses if is TeV scale $F$ or below electroweak scale. also...

In the context of minimal left-right symmetric model, we study interplay between current and future neutrinoless double beta ($0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$) decay experiments, long-lived particle searches at LHC main detectors ATLAS/CMS, proposed far detector MATHUSLA. The heavy Majorana neutrino can be produced in association with an electron from $W$ boson for a nonzero mixing subsequently decays into another same charge jets. Owing to suppression large...

Nuclear matrix elements (NMEs) for neutrinoless double-beta (0νββ) decay in candidate nuclei play a crucial role interpreting results from current experiments and designing future ones. Accurate NME values serve as important nuclear inputs constraining parameters new physics, such neutrino mass the Wilson coefficients of lepton-number-violating (LNV) operators. In this study, we present comprehensive calculation NMEs 0νββ 76Ge, 82Se, 100Mo, 130Te, 136Xe, using wave functions obtained...

We revisit the contribution to strong <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>C</a:mi><a:mi>P</a:mi></a:math> parameter <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mover accent="true"><c:mi>θ</c:mi><c:mo stretchy="false">¯</c:mo></c:mover></c:math> from leptonic <g:math xmlns:g="http://www.w3.org/1998/Math/MathML" display="inline"><g:mi>C</g:mi><g:mi>P</g:mi></g:math> violation at one-loop level in minimal left-right symmetric...

In the context of left-right symmetric model, we study interplay neutrinoless double beta ($0\nu\beta\beta$) decay, parity-violating M{\o}ller scattering, and high-energy colliders, resulting from Yukawa interaction right-handed doubly-charged scalar to electrons, which could evade severe constraints charged lepton flavor violation. The $0\nu\beta\beta$ decay amplitude receives additional contributions sterile neutrinos. half-life, calculated in effective field theory (EFT) framework, allows...

We investigate the possibility of observable neutrinoless double beta decay $( 0 \nu \beta\beta)$ and viable leptogenesis within a low-scale extended inverse seesaw mechanism with additional sterile neutrinos. General effective field theory (EFT) considerations suggest that if there are experimentally signatures in $0 \beta \beta$-decay lepton asymmetry generated by heavy right-handed neutrino decays, thermal is likely to be unviable. However, this work, we show context leptogenesis, one can...

Abstract In this work, we study the potential of searching for triply charged Higgs boson originating from a complex quadruplet in final state with at least three same-sign leptons. A detailed collider analysis SM backgrounds and signals is performed 100 TeV pp mass below 1 vacuum expectation value $$v_\Delta $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>v</mml:mi> <mml:mi>Δ</mml:mi> </mml:msub> </mml:math> ranging $$1.5\times 10^{-9}~\text {GeV}$$...

A new $U(1)_X$ gauge boson field $X$ can have renormalizable kinetic mixing with the standard model (SM) $U(1)_Y$ $Y$. This induces interactions of SM particles even though starts as a dark photon without such interactions. If is not broken, both and $A$ are massless. One cannot determine which one them physical or by just looking at terms in Lagrangian. We revisit this issue show explicitly that when all contributions included, processes do depend on basis used effects up electromagnetic...

The neutral Higgs boson predicted from spontaneous breaking of electroweak symmetry in the standard model (SM) has been discovered. Precision test properties is one promising ways to study new physics beyond SM. Some most important information know whether there are additional bosons, neutral, singly charged and even multi-charged ones. In this work, we potential search for triply bosons final state with at least three same-sign leptons. A detailed collider analysis SM backgrounds signals a...