Электронный каталог

Статья

Tumasyan, A.
Probing Small Bjorken-x Nuclear Gluonic Structure Via Coherent J/*q Photoproduction in Ultraperipheral Pb-Pb Collisions at *%s&sub(NN) = 5.02 TeV / A.Tumasyan, S.Afanasiev, D.Budkouski, I.Golutvin, I.Gorbunov, V.Karjavine, V.Korenkov, A.Lanev, A.Malakhov, V.Matveev, V.Palichik, V.Perelygin, M.Savina, V.Shalaev, S.Shmatov, S.Shulha, V.Smirnov, O.Teryaev, N.Voytishin, B.S.Yuldashev, A.Zarubin, I.Zhizhin, N.Krasnikov, Z.Tsamalaidze, [CMS Collab.] // Physical Review Letters [Electronic resource]. – 2023. – Vol. 131, No. 26. – P. 262301. – URL: https://doi.org/10.1103/PhysRevLett.131.262301. – Bibliogr.: 71.

Quasireal photons exchanged in relativistic heavy ion interactions are powerful probes of the gluonic structure of nuclei. The coherent J/*q photoproduction cross section in ultraperipheral lead-lead collisions is measured as a function of photon-nucleus center-of-mass energies per nucleon (W&sup(Pb)&sub(*g⁢N)) over a wide range of 40 < W&sup(Pb)&sub(*g⁢N) < 400  GeV. Results are obtained using data at the nucleon-nucleon center-of-mass energy of 5.02 TeV collected by the CMS experiment at the CERN LHC, corresponding to an integrated luminosity of 1.52  nb*−*1. The cross section is observed to rise rapidly at low W&sup(Pb)&sub(*g⁢N) , and plateau above W&sup(Pb)&sub(*g⁢N) *~ 40  GeV, up to 400  GeV, entering a new regime of small Bjorken-𝑥 (*~6 x 10*−*5) gluons being probed in a heavy nucleus. The observed energy dependence is not predicted by current quantum chromodynamic models.



Спец.(статьи,препринты) = С 343 е2 - Взаимодействие релятивистских ядер с ядрами
ОИЯИ = ОИЯИ (JINR)2023