Articles

Measurement of the 𝐡_𝑠^0 β†’ πœ‡πœ‡ effective lifetime with the ATLAS detector

Aad, G.; Abbott, B.; Abeling, K.; Abicht, N. J.; Abidi, S. H.; Aboulhorma, A.; Abramowicz, H.; Abreu, H.; Abulaiti, Y.; Acharya, B. S.; Adam Bourdarios, C.; Adamczyk, L.; Addepalli, S. V.; Addison, M. J.; Adelman, J.; Adiguzel, A.; Adye, T.; Affolder, A. A.; Afik, Y.; Agaras, M. N.; Agarwala, J.; Aggarwal, A.; Agheorghiesei, C.; Ahmad, A.; Ahmadov, F.; Ahmed, W. S.; Ahuja, S.; Ai, X.; Aielli, G.; Aikot, A.; Ait Tamlihat, M.; Aitbenchikh, B.; Aizenberg, I.; Akbiyik, M.; Γ…kesson, T. P. A.; Akimov, A. V.; Akiyama, D.; Akolkar, N. N.; Al Khoury, Konie; Alberghi, G. L.

This paper reports the first ATLAS measurement of the 𝐡_𝑠^0 β†’ πœ‡πœ‡ effective lifetime. The measurement is based on the data collected in 2015–2016, amounting to 26.3 fb⁻¹ of 13 TeV LHC proton-proton collisions. The proper decay-time distribution of 58 Β± 13 background-subtracted signal candidates is fit with simulated signal templates parameterised as a function of the 𝐡_𝑠^0 effective lifetime, with statistical uncertainties extracted through a Neyman construction. The resulting effective measurement of the 𝐡_𝑠^0 β†’ πœ‡πœ‡ lifetime is 0.99⁻⁰˙⁴²/β‚Šβ‚€.₀₇ (stat.) Β± 0.17 (syst.) ps and it is found to be consistent with the Standard Model.

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Also Published In

Title
Journal of High Energy Physics
DOI
https://doi.org/10.1007/JHEP09(2023)199

More About This Work

Academic Units
Physics
Published Here
January 29, 2025

Notes

B Physics, Hadron-Hadron Scattering