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Al-Turany, M.; Altsybeev, I.; Andrei, C.; Barret, V.; Battistini, D.; Beattie, C.; Bianchi, N.; Bize, N.; Blume, C.; Bond, P. M.; Bouziani, Y. E. M.; Braun-Munzinger, P.; Buthelezi, Z.; Caliva, A.; Castillo Castellanos, J.; Clai, G.; Conesa Balbastre, G.; Contreras, J. G.; Cortese, P.; Das, S.; Ehlers, R. J.; Eulisse, G.; Ferrer, M. B.; Foertsch, S.; Furget, C.; Furs, A.; Gaardhøje, J. J.; Gangadharan, D. R.; Garcia-Solis, E.; Giacalone, M.; Giubellino, P.; Gorgon, M.; Guilbaud, M.; Gupta, R.; Hatzifotiadou, D.; Hellbär, E.; Ji, S.; Jimenez, A. A. P.; Junique, A.; Kalinak, P.; Karavichev, O.; Khanzadeev, A.; Kim, B.; Kim, C.; Kim, T.; Kiselev, S.; Klein-Bösing, C.; Kushpil, S.; Lamanna, M.; Liu, A.; Loizides, C.; Lokos, S.; Luparello, G.; Ma, Y. G.; Mallick, D.; Mazzaschi, F.; Mhlanga, S.; Molander, M. A.; Mordasini, C.; Moreira De Godoy, D. A.; Nania, R.; Naydenov, M. N.; Nellen, L.; Neskovic, G.; Nikolaev, S.; Otwinowski, J.; Patley, Y.; Planinic, M.; Quishpe, R. E.; Read, K. F.; Redelbach, A. R.; Riedel, A. A.; Saha, S.; Sahu, D.; Schmidt, H. R.; Schröter, A.; Šerkšnytė, L.; Shaba, T. J.; Sharma, A.; Sheibani, O.; Shou, Q.; Singh, V. K.; Sinha, T.; Smirnov, N.; Soramel, F.; Stratmann, P.; Takahashi, J.; Tauro, A.; Thomas, D.; Tkacik, T.; Toppi, M.; Tumkin, A.; Ulukutlu, B.; Volpe, G.; Xu, R.; Yamaguchi, Y.; Yuncu, A.; Zardoshti, N.; Zhou, D.; Zhu, J.
The journal of high energy physics, 10/2023, Volume: 2023, Issue: 10Journal Article
A bstract The cross section for coherent photonuclear production of J/ ψ is presented as a function of the electromagnetic dissociation (EMD) of Pb. The measurement is performed with the ALICE detector in ultra-peripheral Pb-Pb collisions at a centre-of-mass energy per nucleon pair of s NN = 5.02 TeV. Cross sections are presented in five different J/ ψ rapidity ranges within | y | < 4, with the J/ ψ reconstructed via its dilepton decay channels. In some events the J/ ψ is not accompanied by EMD, while other events do produce neutrons from EMD at beam rapidities either in one or the other beam direction, or in both. The cross sections in a given rapidity range and for different configurations of neutrons from EMD allow for the extraction of the energy dependence of this process in the range 17 < W γ Pb , n < 920 GeV, where W γ Pb , n is the centre-of-mass energy per nucleon of the γ Pb system. This range corresponds to a Bjorken- x interval spanning about three orders of magnitude: 1.1 × 10 − 5 < x < 3.3 × 10 − 2 . In addition to the ultra-peripheral and photonuclear cross sections, the nuclear suppression factor is obtained. These measurements point to a strong depletion of the gluon distribution in Pb nuclei over a broad, previously unexplored, energy range. These results, together with previous ALICE measurements, provide unprecedented information to probe quantum chromodynamics at high energies.
