The relative yields of mesons produced in pp and Pb-Pb collisions at sNN=5.02 TeV and reconstructed via the dimuon decay channel are measured using data collected by the CMS experiment. Double ratios are formed by comparing the yields of the excited states, (2S) and (3S), to the ground state, (1S), in both Pb-Pb and pp collisions at the same center-of-mass energy. The double ratios, [(nS)/(1S)]Pb-Pb/[(nS)/(1S)]pp, are measured to be 0.308±0.055(stat)±0.019(syst) for the (2S) and less than 0.26 at 95% confidence level for the (3S). No significant (3S) signal is found in the Pb-Pb data. The double ratios are studied as a function of collision centrality, as well as transverse momentum and rapidity. No significant dependencies are observed.

Sirunyan, A., Tumasyan, A., Adam, W., Asilar, E., Bergauer, T., Brandstetter, J., et al. (2018). Suppression of Excited States Relative to the Ground State in Pb-Pb Collisions at s NN=5.02 TeV. PHYSICAL REVIEW LETTERS, 120(14) [10.1103/PhysRevLett.120.142301].

Suppression of Excited States Relative to the Ground State in Pb-Pb Collisions at s NN=5.02 TeV

Dinardo M. E.;Ghezzi A.;Govoni P.;Paganoni M.;Ragazzi S.;Tabarelli De Fatis T.;Lucchini M. T.;Gerosa R.;Massironi A.;De Guio F.;
2018

Abstract

The relative yields of mesons produced in pp and Pb-Pb collisions at sNN=5.02 TeV and reconstructed via the dimuon decay channel are measured using data collected by the CMS experiment. Double ratios are formed by comparing the yields of the excited states, (2S) and (3S), to the ground state, (1S), in both Pb-Pb and pp collisions at the same center-of-mass energy. The double ratios, [(nS)/(1S)]Pb-Pb/[(nS)/(1S)]pp, are measured to be 0.308±0.055(stat)±0.019(syst) for the (2S) and less than 0.26 at 95% confidence level for the (3S). No significant (3S) signal is found in the Pb-Pb data. The double ratios are studied as a function of collision centrality, as well as transverse momentum and rapidity. No significant dependencies are observed.
Articolo in rivista - Articolo scientifico
Standard Model
English
2018
120
14
142301
none
Sirunyan, A., Tumasyan, A., Adam, W., Asilar, E., Bergauer, T., Brandstetter, J., et al. (2018). Suppression of Excited States Relative to the Ground State in Pb-Pb Collisions at s NN=5.02 TeV. PHYSICAL REVIEW LETTERS, 120(14) [10.1103/PhysRevLett.120.142301].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/309551
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