An excess of J/ψyield at very low transverse momentum (pT<0.3GeV/c), originating from coherent photoproduction, is observed in peripheral and semicentral hadronic Pb–Pbcollisions at a center-of-mass energy per nucleon pair of √sNN=5.02TeV. The measurement is performed with the ALICE detector via the dimuon decay channel at forward rapidity (2.5 <4). The nuclear modification factor at very low pTand the coherent photoproduction cross section are measured as a function of centrality down to the 10% most central collisions. These results extend the previous study at √sNN=2.76TeV, confirming the clear excess over hadronic production in the pTrange 0 −0.3GeV/cand the centrality range 70–90%, and establishing an excess with a significance greater than 5σalso in the 50–70% and 30–50% centrality ranges. The results are compared with earlier measurements at √sNN=2.76TeV and with different theoretical predictions aiming at describing how coherent photoproduction occurs in hadronic interactions with nuclear overlap.

Photoproduction of low-pT J/ψ from peripheral to central Pb–Pb collisions at 5.02 TeV / Acharya, S., Adamova, D., Adler, A., Aglieri Rinella, G., Agnello, M., Agrawal, N., Ahammed, Z., Ahmad, S., Ahn, S.U., Ahuja, I., Akindinov, A., Al-Turany, M., Aleksandrov, D., Alessandro, B., Alfanda, H.M., Alfaro Molina, R., Ali, B., Ali, Y., Alici, A., Alizadehvandchali, N., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 846:(2023). [10.1016/j.physletb.2022.137467]

Photoproduction of low-pT J/ψ from peripheral to central Pb–Pb collisions at 5.02 TeV

Bruno G. E.;Colella D.;
2023

Abstract

An excess of J/ψyield at very low transverse momentum (pT<0.3GeV/c), originating from coherent photoproduction, is observed in peripheral and semicentral hadronic Pb–Pbcollisions at a center-of-mass energy per nucleon pair of √sNN=5.02TeV. The measurement is performed with the ALICE detector via the dimuon decay channel at forward rapidity (2.5 <4). The nuclear modification factor at very low pTand the coherent photoproduction cross section are measured as a function of centrality down to the 10% most central collisions. These results extend the previous study at √sNN=2.76TeV, confirming the clear excess over hadronic production in the pTrange 0 −0.3GeV/cand the centrality range 70–90%, and establishing an excess with a significance greater than 5σalso in the 50–70% and 30–50% centrality ranges. The results are compared with earlier measurements at √sNN=2.76TeV and with different theoretical predictions aiming at describing how coherent photoproduction occurs in hadronic interactions with nuclear overlap.
2023
Photoproduction of low-pT J/ψ from peripheral to central Pb–Pb collisions at 5.02 TeV / Acharya, S., Adamova, D., Adler, A., Aglieri Rinella, G., Agnello, M., Agrawal, N., Ahammed, Z., Ahmad, S., Ahn, S.U., Ahuja, I., Akindinov, A., Al-Turany, M., Aleksandrov, D., Alessandro, B., Alfanda, H.M., Alfaro Molina, R., Ali, B., Ali, Y., Alici, A., Alizadehvandchali, N., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 846:(2023). [10.1016/j.physletb.2022.137467]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/262922
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