Measurement of J/ψ production cross-sections in pp collisions at $$ \sqrt{s} $$ = 5 TeV



Aaij, R, Abdelmotteleb, ASW, Abellán Beteta, C, Ackernley, T, Adeva, B, Adinolfi, M, Afsharnia, H, Agapopoulou, C, Aidala, CA, Aiola, S
et al (show 992 more authors) (2021) Measurement of J/ψ production cross-sections in pp collisions at $$ \sqrt{s} $$ = 5 TeV. Journal of High Energy Physics, 2021 (11).

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Abstract

<jats:title>A<jats:sc>bstract</jats:sc> </jats:title><jats:p>The production cross-sections of <jats:italic>J/ψ</jats:italic> mesons in proton-proton collisions at a centre-of-mass energy of <jats:inline-formula><jats:alternatives><jats:tex-math>$$ \sqrt{s} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math></jats:alternatives></jats:inline-formula> = 5 TeV are measured using a data sample corresponding to an integrated luminosity of 9<jats:italic>.</jats:italic>13 ± 0<jats:italic>.</jats:italic>18 pb<jats:sup><jats:italic>−</jats:italic>1</jats:sup>, collected by the LHCb experiment. The cross-sections are measured differentially as a function of transverse momentum, <jats:italic>p</jats:italic><jats:sub>T</jats:sub>, and rapidity, <jats:italic>y</jats:italic>, and separately for <jats:italic>J/ψ</jats:italic> mesons produced promptly and from beauty hadron decays (nonprompt). With the assumption of unpolarised <jats:italic>J/ψ</jats:italic> mesons, the production cross-sections integrated over the kinematic range 0 <jats:italic>&lt; p</jats:italic><jats:sub>T</jats:sub><jats:italic>&lt;</jats:italic> 20 GeV/<jats:italic>c</jats:italic> and 2<jats:italic>.</jats:italic>0 <jats:italic>&lt; y &lt;</jats:italic> 4<jats:italic>.</jats:italic>5 are<jats:disp-formula><jats:alternatives><jats:tex-math>$$ {\displaystyle \begin{array}{c}{\sigma}_{\mathrm{prompt}}\ J/\psi =8.154\pm 0.010\pm 0.283\ \upmu \mathrm{b},\\ {}{\sigma}_{\mathrm{nonprompt}}\ J/\psi =0.820\pm 0.003\pm 0.034\ \upmu \mathrm{b},\end{array}} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mtable> <mml:mtr> <mml:mtd> <mml:msub> <mml:mi>σ</mml:mi> <mml:mtext>prompt</mml:mtext> </mml:msub> <mml:mspace /> <mml:mi>J</mml:mi> <mml:mo>/</mml:mo> <mml:mi>ψ</mml:mi> <mml:mo>=</mml:mo> <mml:mn>8.154</mml:mn> <mml:mo>±</mml:mo> <mml:mn>0.010</mml:mn> <mml:mo>±</mml:mo> <mml:mn>0.283</mml:mn> <mml:mspace /> <mml:mi>μb</mml:mi> <mml:mo>,</mml:mo> </mml:mtd> </mml:mtr> <mml:mtr> <mml:mtd> <mml:msub> <mml:mi>σ</mml:mi> <mml:mtext>nonprompt</mml:mtext> </mml:msub> <mml:mspace /> <mml:mi>J</mml:mi> <mml:mo>/</mml:mo> <mml:mi>ψ</mml:mi> <mml:mo>=</mml:mo> <mml:mn>0.820</mml:mn> <mml:mo>±</mml:mo> <mml:mn>0.003</mml:mn> <mml:mo>±</mml:mo> <mml:mn>0.034</mml:mn> <mml:mspace /> <mml:mi>μb</mml:mi> <mml:mo>,</mml:mo> </mml:mtd> </mml:mtr> </mml:mtable> </mml:math></jats:alternatives></jats:disp-formula></jats:p><jats:p>where the first uncertainties are statistical and the second systematic. These cross-sections are compared with those at <jats:inline-formula><jats:alternatives><jats:tex-math>$$ \sqrt{s} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math></jats:alternatives></jats:inline-formula> = 8 TeV and 13 TeV, and are used to update the measurement of the nuclear modification factor in proton-lead collisions for <jats:italic>J/ψ</jats:italic> mesons at a centre-of-mass energy per nucleon pair of <jats:inline-formula><jats:alternatives><jats:tex-math>$$ \sqrt{s_{\mathrm{NN}}} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:msub> <mml:mi>s</mml:mi> <mml:mi>NN</mml:mi> </mml:msub> </mml:msqrt> </mml:math></jats:alternatives></jats:inline-formula> = 5 TeV. The results are compared with theoretical predictions.</jats:p>

Item Type: Article
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 17 Jan 2022 09:16
Last Modified: 05 Oct 2022 20:21
DOI: 10.1007/jhep11(2021)181
Open Access URL: https://arxiv.org/pdf/2109.00220v2.pdf
URI: https://livrepository.liverpool.ac.uk/id/eprint/3146840