PoS - Proceedings of Science
Volume 449 - The European Physical Society Conference on High Energy Physics (EPS-HEP2023) - T06 QCD and Hadronic Physics
Observation of antihelium and antihypertriton in pp collisions with LHCb
H. Jage*  on behalf of the LHCb collaboration
Full text: pdf
Pre-published on: February 23, 2024
Published on: March 21, 2024
The first observation at the LHCb experiment of hypertritons and antihypertritons is reported.
The used dataset consists of $pp$ collisions at $\sqrt{s} = 13\,\mathrm{Te\kern -0.1em V}$, collected between 2016 and 2018, and corresponds to an integrated luminosity of $5.5\,\mathrm{fb}^{-1}$.
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 $1.1\times10^5$ prompt helium and antihelium candidates are identified with negligible background contamination and $107\pm11$ 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.
DOI: https://doi.org/10.22323/1.449.0254
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