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 √sNN =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<30GeV/c and the center-of-mass rapidity range −2.4<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.
Measurement of prompt ψ(2S) production cross sections in proton–lead and proton–proton collisions at √sNN =5.02TeV
Ravera F.;Amapane N.;Argiro S.;Bellan R.;Costa M.;Covarelli R.;Kiani B.;Migliore E.;Monaco V.;Monteil E.;Obertino M. M.;Pacher L.;Pinna Angioni G. L.;Romero A.;Sacchi R.;Shchelina K.;Sola V.;Solano A.;Rumerio P.;
2019-01-01
Abstract
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 √sNN =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<30GeV/c and the center-of-mass rapidity range −2.4<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.File | Dimensione | Formato | |
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