Coherent J/psi photoproduction at forward rapidity in ultra-peripheral Pb-Pb collisions at root s(NN)=5.02 TeV

Alice Collaboration

doi:10.1016/j.physletb.2019.134926

Coherent J/psi photoproduction at forward rapidity in ultra-peripheral Pb-Pb collisions at root s(NN)=5.02 TeV

Alice Collaboration

Eksperimentel subatomar fysik

11 Citationer (Scopus)

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Abstract

The ALICE collaboration performed the first rapidity-differential measurement of coherent J/ψ photoproduction in ultra-peripheral Pb–Pb collisions at a center-of-mass energy s_NN=5.02 TeV. The J/ψ is detected via its dimuon decay in the forward rapidity region (−4.0<y<−2.5) for events where the hadronic activity is required to be minimal. The analysis is based on an event sample corresponding to an integrated luminosity of about 750 μb⁻¹. The cross section for coherent J/ψ production is presented in six rapidity bins. The results are compared with theoretical models for coherent J/ψ photoproduction. These comparisons indicate that gluon shadowing effects play a role in the photoproduction process. The ratio of ψ^′ to J/ψ coherent photoproduction cross sections was measured and found to be consistent with that measured for photoproduction off protons.

Originalsprog	Engelsk
Artikelnummer	134926
Tidsskrift	Physics Letters B
Vol/bind	798
Antal sider	22
ISSN	0370-2693
DOI	https://doi.org/10.1016/j.physletb.2019.134926
Status	Udgivet - 10 nov. 2019

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10.1016/j.physletb.2019.134926Licens: CC BY

1-s2.0-S0370269319306483-mainForlagets udgivne version, 1,13 MB

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title = "Coherent J/psi photoproduction at forward rapidity in ultra-peripheral Pb-Pb collisions at root s(NN)=5.02 TeV",

abstract = "The ALICE collaboration performed the first rapidity-differential measurement of coherent J/ψ photoproduction in ultra-peripheral Pb–Pb collisions at a center-of-mass energy sNN=5.02 TeV. The J/ψ is detected via its dimuon decay in the forward rapidity region (−4.0−1. The cross section for coherent J/ψ production is presented in six rapidity bins. The results are compared with theoretical models for coherent J/ψ photoproduction. These comparisons indicate that gluon shadowing effects play a role in the photoproduction process. The ratio of ψ′ to J/ψ coherent photoproduction cross sections was measured and found to be consistent with that measured for photoproduction off protons.",

author = "S. Acharya and D. Adamova and SP Adhya and A. Adler and J Adolfsson and MM. Aggarwal and G.A. Rinella and Maria Agnello and N. Agrawal and Z. Ahammed and Ian Bearden and Bourjau, {Christian Alexander} and Marek Chojnacki and Ante Bilandzic and Katarina Gajdosova and Gaardh{\o}je, {Jens J{\o}rgen} and bsm989 bsm989 and rtc312 rtc312 and Freja Thoresen and Vojtech Pacik and Vytautas Vislavicius and You Zhou and Nielsen, {B{\o}rge Svane} and J{\"u}rgen Schukraft and {Alice Collaboration}",

year = "2019",

month = nov,

day = "10",

doi = "10.1016/j.physletb.2019.134926",

language = "English",

volume = "798",

journal = "Physics Letters B: Particle Physics, Nuclear Physics and Cosmology",

issn = "0370-2693",

publisher = "Elsevier",

}

TY - JOUR

T1 - Coherent J/psi photoproduction at forward rapidity in ultra-peripheral Pb-Pb collisions at root s(NN)=5.02 TeV

AU - Acharya, S.

AU - Adamova, D.

AU - Adhya, SP

AU - Adler, A.

AU - Adolfsson, J

AU - Aggarwal, MM.

AU - Rinella, G.A.

AU - Agnello, Maria

AU - Agrawal, N.

AU - Ahammed, Z.

AU - Bearden, Ian

AU - Bourjau, Christian Alexander

AU - Chojnacki, Marek

AU - Bilandzic, Ante

AU - Gajdosova, Katarina

AU - Gaardhøje, Jens Jørgen

AU - bsm989, bsm989

AU - rtc312, rtc312

AU - Thoresen, Freja

AU - Pacik, Vojtech

AU - Vislavicius, Vytautas

AU - Zhou, You

AU - Nielsen, Børge Svane

AU - Schukraft, Jürgen

AU - Alice Collaboration

PY - 2019/11/10

Y1 - 2019/11/10

N2 - The ALICE collaboration performed the first rapidity-differential measurement of coherent J/ψ photoproduction in ultra-peripheral Pb–Pb collisions at a center-of-mass energy sNN=5.02 TeV. The J/ψ is detected via its dimuon decay in the forward rapidity region (−4.0−1. The cross section for coherent J/ψ production is presented in six rapidity bins. The results are compared with theoretical models for coherent J/ψ photoproduction. These comparisons indicate that gluon shadowing effects play a role in the photoproduction process. The ratio of ψ′ to J/ψ coherent photoproduction cross sections was measured and found to be consistent with that measured for photoproduction off protons.

AB - The ALICE collaboration performed the first rapidity-differential measurement of coherent J/ψ photoproduction in ultra-peripheral Pb–Pb collisions at a center-of-mass energy sNN=5.02 TeV. The J/ψ is detected via its dimuon decay in the forward rapidity region (−4.0−1. The cross section for coherent J/ψ production is presented in six rapidity bins. The results are compared with theoretical models for coherent J/ψ photoproduction. These comparisons indicate that gluon shadowing effects play a role in the photoproduction process. The ratio of ψ′ to J/ψ coherent photoproduction cross sections was measured and found to be consistent with that measured for photoproduction off protons.

U2 - 10.1016/j.physletb.2019.134926

DO - 10.1016/j.physletb.2019.134926

M3 - Journal article

SN - 0370-2693

VL - 798

JO - Physics Letters B: Particle Physics, Nuclear Physics and Cosmology

JF - Physics Letters B: Particle Physics, Nuclear Physics and Cosmology

M1 - 134926

ER -

Coherent J/psi photoproduction at forward rapidity in ultra-peripheral Pb-Pb collisions at root s(NN)=5.02 TeV

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