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Karlsruhe 2024 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 114: Standard model 4 (strong/QCD)

T 114.2: Vortrag

Freitag, 8. März 2024, 09:15–09:30, Geb. 30.23: 2/0

Observation of antihelium and antihypertriton in pp collisions with LHCb — •Hendrik Jage, Dan Moise, Valery Zhukov, and Stefan Schael — I. Physikalisches Institut B, RWTH Aachen

The first observation at the LHCb experiment of hypertritons and antihypertritons is reported. The used dataset consists of pp collisions at √s = 13 TeV, collected between 2016 and 2018, and corresponds to an integrated luminosity of 5.5 fb−1. The hypertriton candidates are reconstructed via the two-body decay into helium-3 and a charged pion. The corresponding helium nuclei are identified with a technique that is innovative at the LHCb experiment and mainly exploits ionisation losses in the LHCb silicon sensors. A total of 1.1×105 prompt helium and antihelium candidates are identified with negligible background contamination and 107±11 hypertriton candidates are found, paving the way for a rich programme of precise measurements of QCD and astrophysical interest to be performed on the available data.

Keywords: Hypertriton; Helium; Particle Identification; LHCb

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