SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 2: Flavor I

T 2.1: Vortrag

Montag, 20. März 2023, 16:30–16:45, HSZ/0004

Search for ³He and _Λ³H at LHCb — •Hendrik Jage¹, Razvan-Daniel Moise¹, Gediminas Sarpis², Valery Zhukov¹, and Stefan Schael¹ — ¹I. Physikalisches Institut B, RWTH Aachen University — ²University of Edinburgh

In recent presentations, AMS-02 has reported the observation of several anti-helium candidates in cosmic rays. In 2020, it has been suggested by M. Winkler and T. Linden that dark matter annihilation into b-quarks could produce a detectable ³He flux in cosmic rays via Λ_b⁰ decays.

The LHCb detector at CERN is an experiment dedicated to the study of b-hadrons, which are abundantly produced in the proton-proton collisions at the Large Hadron Collider (LHC). Therefore, the large sample of Λ_b⁰ decays, collected by LHCb until 2018, provides a unique opportunity to study the potential displaced production of ³He via Λ_b⁰ decays.

While prompt ³He from proton-proton collisions as well as from _Λ³H→³Heπ⁻ decays has already been observed at the LHC by the ALICE Collaboration in the central region (|y|<0.5), prompt and displaced ³He has not previously been searched for at LHCb (2 < η < 5). In this talk, the possibility of identifying ³He with the LHCb tracking system is discussed and the status of the on-going analysis is presented.