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| VOLUME 119 (2024) | ISSUE 11 | PAGE 796 |
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Double parton scattering versus jet quenching
S. P. Baranov+, A. V. Lipatov*× 1), M. A. Malyshev*× 1), A. M. Snigirev*× 1)
+P. N. Lebedev Institute of Physics, 119991 Moscow, Russia *Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119991 Moscow, Russia ×Joint Institute for Nuclear Research, 141980 Dubna, Russia
Abstract
A novel observable, the double nuclear modification factor, is proposed to probe simultaneously the initial and final state effects in nucleus-nucleus collisions. An interesting competition between the combinatorial enhancement in the double parton scattering and the suppression due to parton energy loss can be observed in the production rate of two hard particles. In particular, the production of J/ψ mesons in association with a W boson is not suppressed but is enhanced in the region of moderate transverse momenta, unlike the case of unassociated (inclusive) J/ψ production. At the same time, in the region of high enough transverse momenta the nuclear modification factor for associated J/ψ+W production converges to that of unassociated J/ψ. |