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.
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
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Pre-published on:
February 23, 2024
Published on:
March 21, 2024
Abstract
DOI: https://doi.org/10.22323/1.449.0254
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Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.