According to quantum chromodynamics, at sufficiently high energy, the structure of hadrons reveals a dynamic equilibrium between gluon splitting and gluon recombination - a phenomenon known as saturation. The process of diffractive photonuclear production of a J/ψ vector meson provides a direct insight into the gluon composition of hadrons. The J/ψ production as a function of momentum transferred in the interaction, quantified by the Mandelstam-t variable, serves as an excellent probe for studying the structure of hadrons within the impact-parameter plane, because different ranges in t are sensitive to the dynamics of the gluon field at varying spatial size scales. The ALICE Collaboration has measured the energy dependence of incoherent photonuclear production of J/ψ mesons off lead ions, at sNN=5.02 TeV, for three Mandelstam-t intervals. The energy dependence of the photonuclear cross section at the highest |t| range measured, (0.81<|t|<1.44) GeV2, is sensitive to subnucleonic structures of the Pb target. The increase of the cross section with energy at large |t| shows evidence of suppression with respect to the increase seen at low |t|. The observed pattern of the energy evolution in data is similar to that of gluon saturation models.

Evidence for J/psi Suppression in Incoherent Photonuclear Production / Acharya, S., Agarwal, A., Aglieri Rinella, G., Aglietta, L., Agnello, M., Agrawal, N., Ahammed, Z., Ahmad, S., Ahn, S. u., Ahuja, I., Akindinov, A., Akishina, V., Al-Turany, M., Aleksandrov, D., Alessandro, B., Alfanda, H. m., Alfaro Molina, R., Ali, B., Alici, A., Alizadehvandchali, N., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 137:5(2026), pp. 052301.052301-052301.052301. [10.1103/jmwb-75m7]

Evidence for J/psi Suppression in Incoherent Photonuclear Production

Bruno, G.  E.;Palasciano, A.;Triloki, T.;
2026

Abstract

According to quantum chromodynamics, at sufficiently high energy, the structure of hadrons reveals a dynamic equilibrium between gluon splitting and gluon recombination - a phenomenon known as saturation. The process of diffractive photonuclear production of a J/ψ vector meson provides a direct insight into the gluon composition of hadrons. The J/ψ production as a function of momentum transferred in the interaction, quantified by the Mandelstam-t variable, serves as an excellent probe for studying the structure of hadrons within the impact-parameter plane, because different ranges in t are sensitive to the dynamics of the gluon field at varying spatial size scales. The ALICE Collaboration has measured the energy dependence of incoherent photonuclear production of J/ψ mesons off lead ions, at sNN=5.02 TeV, for three Mandelstam-t intervals. The energy dependence of the photonuclear cross section at the highest |t| range measured, (0.81<|t|<1.44) GeV2, is sensitive to subnucleonic structures of the Pb target. The increase of the cross section with energy at large |t| shows evidence of suppression with respect to the increase seen at low |t|. The observed pattern of the energy evolution in data is similar to that of gluon saturation models.
2026
Evidence for J/psi Suppression in Incoherent Photonuclear Production / Acharya, S., Agarwal, A., Aglieri Rinella, G., Aglietta, L., Agnello, M., Agrawal, N., Ahammed, Z., Ahmad, S., Ahn, S. u., Ahuja, I., Akindinov, A., Akishina, V., Al-Turany, M., Aleksandrov, D., Alessandro, B., Alfanda, H. m., Alfaro Molina, R., Ali, B., Alici, A., Alizadehvandchali, N., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 137:5(2026), pp. 052301.052301-052301.052301. [10.1103/jmwb-75m7]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/309421
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