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- W4378945437 abstract "The cross section for coherent photonuclear production of J/$psi$ 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 $sqrt{s_{mathrm{NN}}}=5.02$ TeV. Cross sections are presented in five different J/$psi$ rapidity ranges within $|y|<4$, with the J/$psi$ reconstructed via its dilepton decay channels. In some events the J/$psi$ 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 $17 < W_{gamma, mathrm{Pb, n}} <920$ GeV, where $W_{gamma, mathrm{Pb, n}}$ is the centre-of-mass energy per nucleon of the $gamma,mathrm{Pb}$ system. This range corresponds to a Bjorken-$x$ interval spanning about three orders of magnitude: $ 1.1times10^{-5}<x<3.3times 10^{-2}$. In addition to the ultra-peripheral and photonuclear cross sections, the nuclear suppression factor is obtained. These measurements point to a strong depletion of the gluon distribution in Pb nuclei over a broad, previously unexplored, energy range. These results, together with previous ALICE measurements, provide unprecedented information to probe quantum chromodynamics at high energies." @default.
- W4378945437 created "2023-06-01" @default.
- W4378945437 creator A5076559706 @default.
- W4378945437 date "2023-05-30" @default.
- W4378945437 modified "2023-09-29" @default.
- W4378945437 title "Energy dependence of coherent photonuclear production of J/$psi$ mesons in ultra-peripheral Pb-Pb collisions at $sqrt{s_{mathrm{NN}}}$=5.02 TeV" @default.
- W4378945437 doi "https://doi.org/10.48550/arxiv.2305.19060" @default.
- W4378945437 hasPublicationYear "2023" @default.
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