Conveners
WG2-Beyond the Standard Model: D1 - S2 - Parallel - 5
- Sushil Chauhan (Panjab University (IN))
- Pradipta Ghosh (Department of Physics, Indian Institute of Technology Delhi)
- Bhawna Gomber (University of Hyderabad, India)
- Santosh Rai (Harish-Chandra Research Institute)
WG2-Beyond the Standard Model: D2-S4 - Parallel - 2
- Santosh Rai (Harish-Chandra Research Institute)
- Pradipta Ghosh (Department of Physics, Indian Institute of Technology Delhi)
- Bhawna Gomber (University of Hyderabad, India)
- Sushil Chauhan (Panjab University (IN))
WG2-Beyond the Standard Model: D3-S5 - Parallel - 2
- Santosh Rai (Harish-Chandra Research Institute)
- Bhawna Gomber (University of Hyderabad, India)
- Sushil Chauhan (Panjab University (IN))
- Pradipta Ghosh (Department of Physics, Indian Institute of Technology Delhi)
WG2-Beyond the Standard Model: D3-S6 - Parallel - 2
- Santosh Rai (Harish-Chandra Research Institute)
- Sushil Chauhan (Panjab University (IN))
- Pradipta Ghosh (Department of Physics, Indian Institute of Technology Delhi)
- Bhawna Gomber (University of Hyderabad, India)
WG2-Beyond the Standard Model: D4-S7 - Parallel - 2
- Sushil Chauhan (Panjab University (IN))
- Pradipta Ghosh (Department of Physics, Indian Institute of Technology Delhi)
- Santosh Kumar Rai (Harish-Chandra Research Institute)
- Bhawna Gomber (University of Hyderabad, India)
The couplings of the Higgs boson (H) with massive gauge bosons of weak interaction (V = W, Z), can be probed in single Higgs boson production at the proposed future Large Hadron-Electron Collider (LHeC). In this talk, I will be presenting the collider reach on the new physics parameters of the HVV couplings assessed through the azimuthal angle correlation between missing energy (electron) and...
The non-thermally produced freeze-in dark matter is an attractive alternative to look beyond the weakly interacting massive particle (WIMP) paradigm. With the singlet-doublet dark matter model, a simple extension to the Standard Model (SM), we probe the light dark matter parameter space, assuming feeble couplings between SM particles and the dark matter candidate. We tried to show that in the...
Electroweak Symmetry Breaking (EWSB) is known to produce a massive universe that we live in. However, it may also provide an important boundary for freeze-in or freeze-out of dark matter (DM) connected to the Standard Model via the Higgs portal as processes contributing to DM relic differ across the boundary. We explore such possibilities in a two-component DM framework, where a massive...
We report on the results of new physics searches in a final state containing a photon and missing transverse energy called โmonophoton searchesโ in a p-p collision at โs =13TeV. The data correspond to an integrated luminosity of 138fb$^-$$^1$. In the Standard Model, the only process that results in the genuine signature of a single photon and large MET is Z + ฮณ production, in which the Z boson...
In this work we study a viable dark matter (DM) mass region in a non-supersymmetric $SO(10)$ GUT scalar dark matter model. The model comprises of a scalar singlet $S$ and an inert doublet $\phi$ which are odd under a discrete $Z_2$ matter parity $(-1)^{(B-L)}$. The DM is a mixture of $Z_2$ - odd scalar singlet $S$ and neutral component of doublet $\phi$ belonging to a new scalar 16...
In this work, we have explored a highly motivated beyond the Standard Model scenario, namely, R-parity violating supersymmetry, in the context of light neutrino mass and mixing. The R-parity is broken by only the lepton number violating the bilinear term. We try to fit two non-zero neutrino mass square differences and three mixing angle values obtained from the global chi-square analysis of...
The CMS and ATLAS experiments have made clear observations of a Standard Model (SM) Higgs boson candidate with a mass of 125 GeV. While its discovery has reaffirmed the SM, detailed measurements of its properties and searches for additional similar undiscovered particles are promising methods of discovering Beyond SM (BSM) physics. A search for the SM Higgs boson decaying to Z boson and a...
Various extensions of the standard model (SM) invoke the presence of more than one Higgs doublet in the SM Lagrangian. In particular, the two-Higgs doublet model assumes the presence of an additional $SU(2)_{L}$ complex doublet. We are looking for $H^{\pm}$ in the top-quark pair production process, where one top quark decays to a charged Higgs boson and a bottom quark, and the other to a $W$...
The inert Higgs-doublet model provides a simple framework to accommodate a viable Higgs portal scalar dark matter candidate, together with other heavier scalars of mass 100 GeV or more. We study the effect of next-to-leading order (NLO) QCD corrections in this scenario in the context of the Large Hadron Collider.
${\cal{O}}(\alpha_s)$ corrections to the gluon-gluon-Higgs effective coupling...
We consider a fermionic dark matter (DM) in the left-right symmetric framework by introducing a pair of vector-like (VL) doublets in the particle spectrum. The stability of the DM is ensured through an unbroken Z2 symmetry. We explore the parameter space of the model compatible with the observed relic density and direct and indirect detection cross sections. The presence of charged dark...
We present a search for the lepton flavor violating decays $B_s \rightarrow \ell \tau$; $\ell = e, \mu$ using the full data sample of 121.4 fb$^{-1}$ of data recorded on $\Upsilon(5S)$ resonance with the Belle detector at the KEKB asymmetric energy $e^+e^-$ collider. We use $B_s\bar{B_s}$ events in which one $B_s$ meson is reconstructed in a semileptonic $B_s \rightarrow D_s \ell \nu$ decay...
We present the results of a search for new physics in events with a photon, an electron or muon, and large missing transverse energy (MET). The study is based on a sample of proton-proton collisions at $\sqrt{s} = 13$ TeV corresponding to an integrated luminosity of 137 $fb^{-1}$ collected with the CMS detector in 2016-2018. Many models of new physics predict events with jets and significant...
The extension of SM with inert doublet and right-handed neutrinos is being studied. The
inert doublet which is odd under Z_2 does not take part in the electroweak symmetry breaking
(EWSB) and thus provides a viable dark matter candidate. The light neutrino mass is generated by the seesaw mechanism. It is observed that vacuum stability is rescued by the addition
of scalars i.e. doublet and...
Standard Model (SM) is a theory of fundamental particles and their interactions. Despite being a successful theory, SM is unable to offer explanation for the existence of Dark matter (DM), matter-antimatter asymmetry, hierarchy problem, neutrino masses etc. Many models beyond the SM have evolved over the time to explain these limitations. One such model is Supersymmetry (SUSY) which has been...
Electroweak Baryogenesis needs a Strong First-Order Electroweak Phase Transition as a pre-requisite to explain the observed Baryon asymmetry of the Universe. A strong first-order electroweak phase transition, single or multi-step, can be accommodated easily in supersymmetric models with singlet extensions. Confining ourselves in the context of the Next-to-Minimal Supersymmetric Standard Model...
After a decade of Higgs boson discovery by the ATLAS and the CMS experiment at the LHC, subsequent observation of ttH events, and study of Higgs decaying into a pairs of W(Z) boson and $\tau$ fermion, physics beyond the standard model still remains a puzzle. Vector-like quarks (VLQs) are hypothetical spin-1/2 particles of the fourth generation that have left and right-handed components...
In this work, we have considered an extension of the standard model (SM) with a $SU(2)_L$ singlet vector-like quark (VLQ) with electric charge $Q=+2/3$. The model also contains an additional local $U(1)_d$ symmetry group and the corresponding gauge boson is the dark photon. The VLQ is charged while all the SM particles are neutral under the new $U(1)_d$ gauge group. Even though in this model...
The ATLAS and CMS collaborations have measured the Higgs boson in a variety of production and decay modes. These measurements still leave room for exotic Higgs boson couplings proposed by simple extensions of the Standard Model (SM). In recent years much effort has been put into looking for the 125 GeV Higgs decaying to two light pseudoscalars which then decay to bb, mumu, tautau etc. In this...
The ATLAS and CMS experiments have analyzed about $140 fb^{-1}$ data which was collected during Run 2 of the LHC. There are several beyond standard model searches that are/will be carried out by these experiments. A brief summary of recent supersymmetry searches is presented. The talk discusses current limits on strongly produced SUSY particles, electroweakinos and sleptons. Some of the...
Rare baryonic decays induced by flavour changing neutral current (FCNC) have been of immense interest in recent years because of their sensitivities towards new physics (NP) beyond the standard model (SM). The exploration had been triggered with the observation of $ฮ_bโฮฮผ^+ ฮผ^-$ transition at the Fermilab [1] and the LHCb [2]. Theoretically these decays are also studied at different NP models...
We build different gauged $U(1)_X$ models ($X = B, L B+L$) by finding anomaly free solutions. We analyse their phenomenological implications focusing on proton decay. We find that the $U(1)_L$ model is the most interesting case. We analyse the possibility of the gauged $U(1)_L$ breaking to a residual Z_3 subgroup and show that it leads to novel proton decays. We find that the usual two-body...
We investigate a left-right symmetric model obeying $SU(3)_C \otimes SU(2)_L \otimes U(1)_L \otimes SU(2)_R \otimes U(1)_R$ local gauge symmetry. We consider the fermions of full $\bf{27}$-plet of $E_6$. Having one bi-doublet, two doublet and one singlet scalar is necessary for a complete symmetry breaking to Standard Model. Its rich particle sector is one of the reasons behind our interest in...
