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Coherent ψ(2S) photo-production in ultra-peripheral Pb–Pb collisions at √sNN = 2.76 TeV

Karasu Uysal, Ayben; ALICE, Collaboration
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Date
2015
URI
https://hdl.handle.net/20.500.12498/521
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Abstract
We have performed the first measurement of the coherent ψ(2S) photo-production cross section in ultra- peripheral Pb–Pb collisions at the LHC. This charmonium excited state is reconstructed via the ψ(2S)→ l+l− and ψ(2S)→J/ψπ+π− decays, where the J/ψ decays into two leptons. The analysis is based on an event sample corresponding to an integrated luminosity of about 22 μb−1. The cross section for coherent ψ (2S) production in the rapidity interval −0.9 < y < 0.9 is dσ coh /d y = 0.83 ± 0.19������stat + syst����� mb. The ψ (2S) ψ (2S) to J/ψ coherent cross section ratio is 0.34+0.08 (stat + syst). The obtained results are compared to theoretical models....  Show more  Show less
Keyword
ψ(2S) photo-production, LHC, ALICE
Item type
Article
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  • Scopus İndeksli Yayınlar Koleksiyonu [897]
  • Web of Science ve Scopus Atıf Dizinlerindeki Yayınlar [258]
  • WoS İndeksli Yayınlar Koleksiyonu [709]

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