Bibcode
Khachatryan, V.; Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Brondolin, E.; Dragicevic, M.; Erö, J.; Flechl, M.; Friedl, M.; Frühwirth, R.; Ghete, V. M.; Hartl, C.; Hörmann, N.; Hrubec, J.; Jeitler, M.; König, A.; Krätschmer, I.; Liko, D.; Matsushita, T.; Mikulec, I.; Rabady, D.; Rad, N.; Rahbaran, B.; Rohringer, H.; Schieck, J.; Strauss, J.; Waltenberger, W.; Wulz, C.-E.; Dvornikov, O.; Makarenko, V.; Zykunov, V.; Mossolov, V.; Shumeiko, N.; Suarez Gonzalez, J.; Alderweireldt, S.; De Wolf, E. A.; Janssen, X.; Lauwers, J.; Van De Klundert, M.; Van Haevermaet, H.; Van Mechelen, P.; Van Remortel, N.; Van Spilbeeck, A.; Abu Zeid, S.; Blekman, F.; D'Hondt, J.; Daci, N.; De Bruyn, I.; Deroover, K.; Lowette, S.; Moortgat, S.; Moreels, L.; Olbrechts, A.; Python, Q.; Tavernier, S.; Van Doninck, W.; Van Mulders, P.; Van Parijs, I.; Brun, H.; Clerbaux, B.; De Lentdecker, G.; Delannoy, H.; Fasanella, G.; Favart, L.; Goldouzian, R.; Grebenyuk, A.; Karapostoli, G.; Lenzi, T.; Léonard, A.; Luetic, J.; Maerschalk, T.; Marinov, A.; Randle-conde, A.; Seva, T.; Vander Velde, C.; Vanlaer, P.; Vannerom, D.; Yonamine, R.; Zenoni, F.; Zhang, F.; Cimmino, A.; Cornelis, T.; Dobur, D.; Fagot, A.; Garcia, G.; Gul, M.; Khvastunov, I.; Poyraz, D.; Salva, S.; Schöfbeck, R.; Sharma, A.; Tytgat, M.; Van Driessche, W.; Yazgan, E.; Zaganidis, N.; Bakhshiansohi, H.; Beluffi, C. et al.
Bibliographical reference
Physics Letters B, Volume 770, p. 357-379.
Advertised on:
7
2017
Citations
110
Refereed citations
81
Description
The production yields of ϒ(1S), ϒ(2S), and ϒ(3S)
quarkonium states are measured through their decays into muon pairs in
the CMS detector, in PbPb and pp collisions at the centre-of-mass energy
per nucleon pair of 2.76 TeV. The data correspond to integrated
luminosities of 166μb-1 and 5.4pb-1 for PbPb
and pp collisions, respectively. Differential production cross sections
are reported as functions of ϒ rapidity y up to 2.4, and
transverse momentum pT up to 20GeV / c. A strong
centrality-dependent suppression is observed in PbPb relative to pp
collisions, by factors of up to ≈2 and 8, for the ϒ(1S) and
ϒ(2S) states, respectively. No significant dependence of this
suppression is observed as a function of y or pT. The
ϒ(3S) state is not observed in PbPb collisions, which corresponds
to a suppression for the centrality-integrated data by at least a factor
of ≈7 at a 95% confidence level. The observed suppression is in
agreement with theoretical scenarios modeling the sequential melting of
quarkonium states in a quark gluon plasma.