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

Session

Belle II

10 Nov 2021, 14:00

Virtually, worldwide

Conveners

Belle II: (All talks 12+3)

• José Francisco Zurita (IFIC - Univ. of Valencia and CSIC (ES))
• Louie Dartmoor Corpe (CERN)

Presentation materials

Recording

13. Probing charged lepton flavor violation with axion-like particles at Belle II

Zeren Simon Wang (National Tsing Hua University)

10/11/2021, 14:00

We study charged lepton flavor violation associated with a light leptophilic axion-like particle (ALP), $X$, at the $B$-factory experiment Belle II. We focus on production of the ALP in the tau decays $\tau \to X l$ with $l=e,\mu$, followed by its decay via $X\to l^- l^+$. The ALP can be either promptly decaying or long-lived. We perform Monte-Carlo simulations, recasting a prompt search at...

10. Long-lived Sterile Neutrinos at Belle II in Effective Field Theory

Julian Günther

10/11/2021, 14:15

At Belle II, large and clean samples of $\tau$ leptons are produced and may decay to sterile neutrinos. For the relevant mass range, such sterile neutrinos are typically long-lived, leading to displaced-vertex (DV) signatures at colliders. Here, we study a DV search of sterile neutrinos at Belle II in the framework of the sterile-neutrino-extended Standard Model Effective Field Theory...

12. Heavy QCD Axion at Belle II: Displaced and Prompt Signals

Vazha Loladze (Florida State University)

10/11/2021, 14:30

The QCD axion is a well-motivated addition to the standard model to solve the strong $CP$ problem. If the axion acquires mass dominantly from a hidden sector, it can be as heavy as $O(1)$ GeV, and the decay constant can be as low as $O(100)$ GeV without running into the axion quality problem. We propose new search strategies for such heavy QCD axions at the Belle II experiment, where the...

26. Displaced or Invisible? ALPs from B decays at Belle II

Ruth Schäfer

10/11/2021, 14:45

At collider experiments, long-lived particles may decay displaced within the detector or leave the detector as missing energy, depending on their lifetime and on the detector geometry. To exploit this complementarity, we propose a new search strategy for invisible ALPs in $B^+\to K^+ a$ decays at Belle II. We compare our predictions with existing and future searches for displaced vertices from...