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Two-particle Bose–Einstein correlations in pp collisions at √s=13 TeV measured with the ATLAS detector at the LHC
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Two-particle Bose–Einstein correlations in pp collisions at √s=13 TeV measured with the ATLAS detector at the LHC

G. Aad, B. Abbott, D.C. Abbott, A. Abed Abud, K. Abeling, D.K. Abhayasinghe, S.H. Abidi, O.S. AbouZeid, N.L. Abraham, H. Abramowicz, …
European Physical Journal C, 卷.82(7), 608
07/2022
DOI: https://doi.org/10.1140/epjc/s10052-022-10472-0

摘要

Engineering (miscellaneous) Physics and Astronomy (miscellaneous)
This paper presents studies of Bose–Einstein correlations (BEC) in proton–proton collisions at a centre-of-mass energy of 13 TeV, using data from the ATLAS detector at the CERN Large Hadron Collider. Data were collected in a special low-luminosity configuration with a minimum-bias trigger and a high-multiplicity track trigger, accumulating integrated luminosities of 151 μ b <sup>- 1</sup> and 8.4 nb <sup>- 1</sup> , respectively. The BEC are measured for pairs of like-sign charged particles, each with | η| < 2.5 , for two kinematic ranges: the first with particle p <sub>T</sub> > 100 MeV and the second with particle p <sub>T</sub> > 500 MeV. The BEC parameters, characterizing the source radius and particle correlation strength, are investigated as functions of charged-particle multiplicity (up to 300) and average transverse momentum of the pair (up to 1.5 GeV). The double-differential dependence on charged-particle multiplicity and average transverse momentum of the pair is also studied. The BEC radius is found to be independent of the charged-particle multiplicity for high charged-particle multiplicity (above 100), confirming a previous observation at lower energy. This saturation occurs independent of the transverse momentum of the pair.

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