Study of exclusive photoproduction of charmonium in ultra-peripheral lead-lead collisions



Aaij, R, Abdelmotteleb, ASW, Beteta, C Abellan, Abudinen, F, Ackernley, T, Adeva, B, Adinolfi, M, Afsharnia, H, Agapopoulou, C, Aidala, CA
et al (show 1057 more authors) (2023) Study of exclusive photoproduction of charmonium in ultra-peripheral lead-lead collisions. JOURNAL OF HIGH ENERGY PHYSICS, 2023 (6).

Access the full-text of this item by clicking on the Open Access link.

Abstract

<jats:title>A<jats:sc>bstract</jats:sc> </jats:title><jats:p>The cross-sections of exclusive (coherent) photoproduction <jats:italic>J/ψ</jats:italic> and <jats:italic>ψ</jats:italic>(2S) mesons in ultra-peripheral PbPb collisions at a nucleon-nucleon centre-of-mass energy of 5<jats:italic>.</jats:italic>02 TeV are measured using a data sample corresponding to an integrated luminosity of 228 ± 10 μb<jats:sup><jats:italic>−</jats:italic>1</jats:sup>, collected by the LHCb experiment in 2018. The differential cross-sections are measured separately as a function of transverse momentum and rapidity in the nucleus-nucleus centre-of-mass frame for <jats:italic>J/ψ</jats:italic> and <jats:italic>ψ</jats:italic>(2S) mesons. The integrated cross-sections are measured to be <jats:inline-formula><jats:alternatives><jats:tex-math>$$ {\sigma}_{J/\psi}^{\textrm{coh}} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>σ</mml:mi> <mml:mrow> <mml:mi>J</mml:mi> <mml:mo>/</mml:mo> <mml:mi>ψ</mml:mi> </mml:mrow> <mml:mi>coh</mml:mi> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula> = 5<jats:italic>.</jats:italic>965 <jats:italic>±</jats:italic> 0<jats:italic>.</jats:italic>059 <jats:italic>±</jats:italic> 0<jats:italic>.</jats:italic>232 <jats:italic>±</jats:italic> 0<jats:italic>.</jats:italic>262 mb and <jats:inline-formula><jats:alternatives><jats:tex-math>$$ {\sigma}_{\psi (2S)}^{\textrm{coh}} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>σ</mml:mi> <mml:mrow> <mml:mi>ψ</mml:mi> <mml:mfenced> <mml:mrow> <mml:mn>2</mml:mn> <mml:mi>S</mml:mi> </mml:mrow> </mml:mfenced> </mml:mrow> <mml:mi>coh</mml:mi> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula> = 0<jats:italic>.</jats:italic>923 <jats:italic>±</jats:italic> 0<jats:italic>.</jats:italic>086 <jats:italic>±</jats:italic> 0<jats:italic>.</jats:italic>028 <jats:italic>±</jats:italic> 0<jats:italic>.</jats:italic>040 mb, where the first listed uncertainty is statistical, the second systematic and the third due to the luminosity determination. The cross-section ratio is measured to be <jats:inline-formula><jats:alternatives><jats:tex-math>$$ {\sigma}_{\psi (2S)}^{\textrm{coh}}/{\sigma}_{J/\psi}^{\textrm{coh}} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>σ</mml:mi> <mml:mrow> <mml:mi>ψ</mml:mi> <mml:mfenced> <mml:mrow> <mml:mn>2</mml:mn> <mml:mi>S</mml:mi> </mml:mrow> </mml:mfenced> </mml:mrow> <mml:mi>coh</mml:mi> </mml:msubsup> <mml:mo>/</mml:mo> <mml:msubsup> <mml:mi>σ</mml:mi> <mml:mrow> <mml:mi>J</mml:mi> <mml:mo>/</mml:mo> <mml:mi>ψ</mml:mi> </mml:mrow> <mml:mi>coh</mml:mi> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula> = 0<jats:italic>.</jats:italic>155 <jats:italic>±</jats:italic> 0<jats:italic>.</jats:italic>014 <jats:italic>±</jats:italic> 0<jats:italic>.</jats:italic>003, where the first uncertainty is statistical and the second is systematic. These results are compatible with theoretical predictions.</jats:p>

Item Type: Article
Uncontrolled Keywords: Heavy Ion Experiments, Heavy-Ion Collision, Photon Production, Quarkonium
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 24 Jul 2023 14:32
Last Modified: 18 Sep 2023 08:48
DOI: 10.1007/JHEP06(2023)146
Open Access URL: https://link.springer.com/content/pdf/10.1007/JHEP...
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3171847