Published January 1, 2012
| Version v1
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Suppression of non-prompt J/psi, prompt J/psi, and Upsilon(1S) in PbPb collisions at root s(NN)=2.76 TeV
Creators
- Chatrchyan, S.1
- Khachatryan, V.1
- Sirunyan, A. M.1
- Tumasyan, A.1
- Adam, W.2
- Bergauer, T.2
- Dragicevic, M.2
- Eroe, J.2
- Fabjan, C.2
- Friedl, M.2
- Fruehwirth, R.2
- Ghete, V. M.2
- Hammer, J.2
- Hoch, M.2
- Hoermann, N.2
- Hrubec, J.2
- Jeitler, M.2
- Kiesenhofer, W.2
- Krammer, M.2
- Mikulec, D. Liko I.2
- Mikulec, D. Liko I.2
- 1. Yerevan Phys Inst, Yerevan 375036, Armenia
- 2. Inst Hochenergiephys OeAW, Vienna, Austria
Description
Yields of prompt and non-prompt J/psi ,as well as Upsilon(1S) mesons, are measured by the CMS experiment via their mu(+)mu(-) decays in PbPb and pp collisions at root s(NN) - 2.76TeV for quarkonium rapidity |y| < 2.4. Differential cross sections and nuclear modification factors are reported as functions of y and transverse momentum p(T), as well as collision centrality. For prompt J/psi with relatively high p(T) (6.5 < p(T) < 30 GeV/c), a strong, centrality-dependent suppression is observed in PbPb collisions, compared to the yield in pp collisions scaled by the number of inelastic nucleon-nucleon collisions. In the same kinematic range, a suppression of non-prompt J/psi, which is sensitive to the in-medium b-quark energy loss, is measured for the first time. Also the low-p(T) Upsilon(1S) mesons are suppressed in PbPb collisions.
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