Exclusive J/ψ photoproduction off protons in ultra-peripheral p-Pb collisions at sNN−−−√=5.02 TeV

We present the first measurement at the LHC of exclusive J=ψ photoproduction off protons, in pffiffiffiffiffiffiffi ultraperipheral proton-lead collisions at sNN 1⁄4 5.02 TeV. Events are selected with a dimuon pair produced either in the rapidity interval, in the laboratory frame, 2.5 < y < 4 (p-Pb) or −3.6 < y < −2.6 (Pb-p), and no other particles observed in the ALICE acceptance. The measured cross sections σðγ þ p → J=ψ þ pÞ are 33.2 2.2ðstatÞ 3.2ðsystÞ 0.7ðtheorÞ nb in p-Pb and 284 36ðstatÞþ27ðsystÞ −32 26ðtheorÞ nb in Pb-p collisions. We measure this process up to about 700 GeV in the γp center of mass, which is a factor of two larger than the highest energy studied at HERA. The data are consistent with a power law dependence of the J=ψ photoproduction cross section in γp energies from about 20 to 700 GeV, or equivalently, from Bjorken x scaling variable between ∼2 × 10−2 and ∼2 × 10−5, thus indicating no significant change in the gluon density behavior of the proton between HERA and LHC energies.

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09 Nisan 2024 11:31
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Eser Adı
(dc.title)
Exclusive J/ψ photoproduction off protons in ultra-peripheral p-Pb collisions at sNN−−−√=5.02 TeV
Yayın Türü
(dc.type)
Makale
Yazar/lar
(dc.contributor.author)
KARASU UYSAL, Ayben
Yazar/lar
(dc.contributor.author)
ALICE Collaboration
DOI Numarası
(dc.identifier.doi)
http://dx.doi.org/10.1103/PhysRevLett.113.232504
Atıf Dizini
(dc.source.database)
Wos
Atıf Dizini
(dc.source.database)
Scopus
Konu Başlıkları
(dc.subject)
ALICE
Konu Başlıkları
(dc.subject)
LHC
Konu Başlıkları
(dc.subject)
J/psi Photoproduction
Yayın Tarihi
(dc.date.issued)
2014
Kayıt Giriş Tarihi
(dc.date.accessioned)
2019-07-05T11:18:26Z
Açık Erişim tarihi
(dc.date.available)
2019-07-05T11:18:26Z
Orcid
(dc.identifier.orcid)
0000-0001-6297-2532
Özet
(dc.description.abstract)
We present the first measurement at the LHC of exclusive J=ψ photoproduction off protons, in pffiffiffiffiffiffiffi ultraperipheral proton-lead collisions at sNN 1⁄4 5.02 TeV. Events are selected with a dimuon pair produced either in the rapidity interval, in the laboratory frame, 2.5 < y < 4 (p-Pb) or −3.6 < y < −2.6 (Pb-p), and no other particles observed in the ALICE acceptance. The measured cross sections σðγ þ p → J=ψ þ pÞ are 33.2 2.2ðstatÞ 3.2ðsystÞ 0.7ðtheorÞ nb in p-Pb and 284 36ðstatÞþ27ðsystÞ −32 26ðtheorÞ nb in Pb-p collisions. We measure this process up to about 700 GeV in the γp center of mass, which is a factor of two larger than the highest energy studied at HERA. The data are consistent with a power law dependence of the J=ψ photoproduction cross section in γp energies from about 20 to 700 GeV, or equivalently, from Bjorken x scaling variable between ∼2 × 10−2 and ∼2 × 10−5, thus indicating no significant change in the gluon density behavior of the proton between HERA and LHC energies.
Tek Biçim Adres
(dc.identifier.uri)
https://hdl.handle.net/20.500.12498/499
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