Measurement of the prompt-production cross-section ratio σ(χ<sub><i>c</i>2</sub>)/σ(χ<sub><i>c</i>1</sub>) in <i>p</i>Pb collisions at √<i>s<sub>NN</sub></i>=8.16 TeV



Aaij, R, Abellan Beteta, C, Ackernley, T, Adeva, B, Adinolfi, M, Afsharnia, H, Aidala, CA, Aiola, S, Ajaltouni, Z, Akar, S
et al (show 946 more authors) (2021) Measurement of the prompt-production cross-section ratio σ(χ<sub><i>c</i>2</sub>)/σ(χ<sub><i>c</i>1</sub>) in <i>p</i>Pb collisions at √<i>s<sub>NN</sub></i>=8.16 TeV. PHYSICAL REVIEW C, 103 (6). 064905-.

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Abstract

This Letter reports the first measurement of prompt $\chi_{c1}$ and $\chi_{c2}$ charmonium production in nuclear collisions at Large Hadron Collider energies. The cross-section ratio $\sigma(\chi_{c2}) / \sigma(\chi_{c1})$ is measured in $p$Pb collisions at $\sqrt{s_{NN}}$ = 8.16 TeV, collected with the LHCb experiment. The $\chi_{c1,2}$ states are reconstructed via their decay to a $\rm{J}/\psi$ meson, subsequently decaying into a pair of oppositely charged muons, and a photon, which is reconstructed in the calorimeter or via its conversion in the detector material. The cross-section ratio is consistent with unity in the two considered rapidity regions. Comparison with a corresponding cross-section ratio previously measured by the LHCb collaboration in $pp$ collisions suggests that $\chi_{c1}$ and $\chi_{c2}$ states are similarly affected by nuclear effects occurring in $p$Pb collisions.

Item Type: Article
Additional Information: All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2020-048.html (LHCb public pages)
Uncontrolled Keywords: hep-ex, hep-ex, nucl-ex
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 02 Sep 2021 08:59
Last Modified: 13 Oct 2023 19:14
DOI: 10.1103/PhysRevC.103.064905
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3134982