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Al-Turany, M.; Alessandro, B.; Arratia, M.; Bala, R.; Barlou, M.; Barret, V.; Basu, S.; Bhasin, A.; Bianchi, A.; Bianchi, L.; Biswas, S.; Blair, J. T.; Blau, D.; Blume, C.; Bolozdynya, A.; Bond, P. M.; Borel, H.; Bossi, H.; Bregant, M.; Bugnon, O.; Buthelezi, Z.; Camacho, R. S.; Christakoglou, P.; Ciupek, M. R.; Contreras, J. G.; Das, P.; Das, P.; Dash, S.; De Pasquale, S.; Do, J.; Eulisse, G.; Fokin, S.; Fusco Girard, M.; Garner, K.; Gianotti, P.; Grabski, V.; Groettvik, O. S.; Hassan, H.; Havener, L. B.; Herman, T.; Ivanov, M.; Jonas, F.; Karasu Uysal, A.; Khan, A. M.; Khanzadeev, A.; Kim, T.; Knospe, A. G.; Kobdaj, C.; Konig, J.; Kovalenko, O.; Gajdosova, K. Krizkova; Krüger, M.; Kurashvili, P.; Lettrich, M.; Lunardon, M.; Malik, Q. W.; Mao, Y.; Matonoha, O.; Meninno, E.; Menon, A. S.; Munhoz, M. G.; Musa, L.; Noh, S.; Nystrand, J.; Oskarsson, A.; Perez, G. M.; Ramello, L.; Raniwala, S.; Rath, R.; Rehman, A.; Riabov, A.; Ristea, C.; Røed, K.; Rzesa, W.; Sadovsky, S.; Schmidt, M. O.; Sekiguchi, Y.; Selyuzhenkov, I.; Serebryakov, D.; Sharma, A.; Sharma, N.; Sheibani, O.; Shigaki, K.; Shimomura, M.; Shirinkin, S.; Silva, T. F. D.; Sitta, M.; Smirnov, N.; Tang, Z.; Tarhini, M.; Tripathy, T.; Tumkin, A.; Urioni, M.; Valle, N.; Vargas, A.; Vasiliev, A.; Vermunt, L.; Verweij, M.; Voscek, D.; Wright, J. R.
The European physical journal. C, Particles and fields, 08/2021, Letnik: 81, Številka: 8Journal Article
The coherent photoproduction of J / ψ and ψ ′ mesons was measured in ultra-peripheral Pb–Pb collisions at a center-of-mass energy s NN = 5.02 TeV with the ALICE detector. Charmonia are detected in the central rapidity region for events where the hadronic interactions are strongly suppressed. The J / ψ is reconstructed using the dilepton ( l + l - ) and proton–antiproton decay channels, while for the ψ ′ the dilepton and the l + l - π + π - decay channels are studied. The analysis is based on an event sample corresponding to an integrated luminosity of about 233 μ b - 1 . The results are compared with theoretical models for coherent J / ψ and ψ ′ photoproduction. The coherent cross section is found to be in a good agreement with models incorporating moderate nuclear gluon shadowing of about 0.64 at a Bjorken- x of around 6 × 10 - 4 , such as the EPS09 parametrization, however none of the models is able to fully describe the rapidity dependence of the coherent J / ψ cross section including ALICE measurements at forward rapidity. The ratio of ψ ′ to J / ψ coherent photoproduction cross sections was also measured and found to be consistent with the one for photoproduction off protons.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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