Searching for long-lived particles at the LHC and beyond: Twelfth workshop of the LLP Community

Session

New ideas: Searches, pheno, theory

4 Nov 2022, 14:00

CERN

Conveners

New ideas: Searches, pheno, theory

• Mason Proffitt (University of Washington (US))
• José Francisco Zurita (IFIC - Univ. of Valencia and CSIC (ES))

New ideas: Searches, pheno, theory

• José Francisco Zurita (IFIC - Univ. of Valencia and CSIC (ES))
• Mason Proffitt (University of Washington (US))

10. Atmospheric axion-like particles at Super-Kamiokande

Zeren Simon Wang (National Tsing Hua University)

04/11/2022, 14:00

We consider a muonphilic axion-like-particle (ALP), denoted as $a$, lighter than twice the muon mass. ALPs of this mass range dominantly decay into a pair of photons, induced by a triangular muon loop. Such light muonphilic ALPs are naturally long-lived. At the atmosphere, the ALPs are copiously produced from charged-meson decays in air showers, such as $\pi^\pm \to \mu^\pm \nu a$, via the...

12. Shedding light on the electroweak phase transition from exotic Higgs boson decays at the lifetime frontiers

Wei Liu (Nanjing University of Science and Technology)

04/11/2022, 14:20

We study the scenarios where a strongly first-order electroweak phase transition (EWPT) is triggered by a light singlet scalar, which has feeble interactions to the Higgs. Since the singlet scalar is light and has weak couplings, it can decay at a macroscopic distance away from the collision point. Therefore, it can be regarded as a long-lived particle (LLP) in such scenarios. We perform the...

29. Analysing some long-lived NSLP signatures in the NMSSM

Amandip De

04/11/2022, 14:40

The Next to Minimal Supersymmetric Standard Model (NMSSM) with singlino-like neutralino as the lightest supersymmetric particle (LSP) can open up possibilities for long-lived electroweakinos. We identify such regions in the NMSSM parameter space where the next to lightest supersymmetric particle (NLSP) is a long-lived bino-like electroweakino, consistent with dark matter direct detection and...

23. Coscattering in micrOMEGAs: LLP implications in the singlet-triplet dark matter model

Gael Alguero

04/11/2022, 15:10

In scenarios with very small dark matter (DM) couplings and small mass splittings between the DM and other dark-sector particles, so-called "coscattering" or "conversion-driven freeze-out" can be the dominant mechanism for DM production. They hence also tend to feature long-lived dark-sector particles with longer lifetimes than in the well-known coannihilation case. In this talk, we present...

9. Searching for Heavy QCD Axions via Dimuon Final States

Soubhik Kumar (UC Berkeley)

04/11/2022, 15:30

Heavy QCD axions are well-motivated BSM candidates that can address both the strong CP problem and the axion quality problem. The defining gluon coupling can lead to significant production of such axions in beam dump and forward facilities. Additionally, if axions couple to SM leptons, as can easily happen within UV frameworks, the produced axions can exhibit long-lived decay into a pair of...