Measurement of Prompt ψ(2S) Production Cross Sections in Proton-Lead and Proton-Proton Collisions at √sNN = 5.02 TeV

Physics Letters B 2019
Viesturs Veckalns, et al 100

Measurements of prompt ψ(2S) meson production cross sections in proton–lead (pPb) and proton–proton (pp) collisions at a nucleon–nucleon center-of-mass energy of s NN =5.02TeV are reported. The results are based on pPb and pp data collected by the CMS experiment at the LHC, corresponding to integrated luminosities of 34.6 nb −1 and 28.0 pb −1 , respectively. The nuclear modification factor R pPb is measured for prompt ψ(2S) in the transverse momentum range 4<p T <30GeV/c and the center-of-mass rapidity range −2.4<y CM <1.93. The results on ψ(2S) R pPb are compared to the corresponding modification factor for prompt J/ψ mesons. The results point to different nuclear effects at play in the production of the excited charmonium state compared to the ground state, in the region of backward rapidity and for p T <10GeV/c.

Keywords
CMS, pPb, ψ(2S)
DOI
10.1016/j.physletb.2019.01.058
Hyperlink
https://www.sciencedirect.com/science/article/pii/S0370269319300838?via%3Dihub

Veckalns, V., 100, e. Measurement of Prompt ψ(2S) Production Cross Sections in Proton-Lead and Proton-Proton Collisions at √sNN = 5.02 TeV. Physics Letters B, 2019, Vol. 790, pp.509-532. ISSN 0370-2693. Available from: doi:10.1016/j.physletb.2019.01.058

Publication language
English (en)