Conveners
BSM II
- Gil Paz (Wayne State University)
We study the discovery prospect of different three body lepton number violating~(LNV) meson decays $M_{1}^{-}\to\ell_{1}^{-}\ell_{2}^{-}M_{2}^{+}$ in the framework of right handed~(RH) neutrino extended Standard Model~(SM). We consider a number of ongoing experiments, such as, NA62 and LHCb at CERN, Belle II at SuperKEK, as well as at the proposed future experiments, SHiP, MATHUSLA and...
Rare decays of $K,B$ mesons provide a powerful probe of dark sectors with light new particles. We show that the pair production of $O(100\,{\rm MeV})$ dark states can be probed with the decays of $K_L$ mesons, owing to the enhanced two-body kinematics, $K_L\to X_1X_2$. If either or these two particles is unstable, {\em e.g.} $X_2\to X_1\pi^0$ or $X_{1,2}\to \gamma\gamma$, such decays could...
We explore a possibility that an inflaton, which drives the cosmological inflation in the early universe, can be detected by the recently approved FASER at the High-Luminosity LHC (HL-LHC). We consider nonminimal quartic inflation scenario in the minimal U(1)$_X$ extension of the Standard Model (SM) with the classical conformal invariance, where the inflaton is identified with the U(1)$_X$...
Many BSM scenarios predict the existence of new long-lived particles (LLPs). Several new experiments have been proposed to probe the long-lifetime regime at the LHC. One of these is MATHUSLA, a large-volume surface-level detector designed to detect neutral ultra-long lived particles. In this talk I will describe how information from MATHUSLA can be combined with main-detector events to...
Long-lived particle is well motivated for the new physics search both for collider phenomenology and dark sector. We make use of new variables related to position to search for long-lived, basing on current CMS detector and the Phase-2 Upgrade of the CMS endcap calorimeter which is a high granularity silicon-based calorimeter (HGCAL). We study the long-lived particle signal induced by...
A light CP-even scalar $S$ can be produced abundantly in the supernova core, via the nucleon bremsstrahlung process $N N \to N N S$ due to its mixing with the standard model (SM) Higgs boson. Taking into account the decay and re-absorption of $S$, we obtain the supernova luminosity constraints on the scalar mass $m_S$ and mixing angle $\sin\theta$ of $S$ with the SM Higgs. $\sin\theta$ is...
Traditionally, Dark Matter (DM) searches are dominantly focused on GeV – TeV mass window. However, though these experiments have reached unprecedented detection sensitivities, the successes only resulted in a push for stronger limits on parameters. This forces people to keep their minds open on other DM candidates, especially in different mass regime. If DM particle is an ultralight gauge...
This talk discusses new techniques to detect signatures potentially originating from long-lived particles in the CMS detector and present prospects for discovery at Run-3 and at the HL-LHC.
