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Indications of suppression of excited Upsilon states in PbPb collisions at sqrt(s_NN) = 2.76 TeV

S. Chatrchyan D. Sillou 1 M. Besancon 2 S. Choudhury 2 M. Dejardin 2 D. Denegri 2 B. Fabbro 2 J.L. Faure 2 F. Ferri 2 S. Ganjour 2 F.X. Gentit 2 A. Givernaud 2 P. Gras 2 G. Hamel de Monchenault 2 P. Jarry 2 E. Locci 2 J. Malcles 2 M. Marionneau 2 L. Millischer 2 J. Rander 2 A. Rosowsky 2 I. Shreyber 2 M. Titov 2 P. Verrecchia 2 S. Baffioni 3 F. Beaudette 3 L. Benhabib 3 L. Bianchini 3 M. Bluj 3 C. Broutin 3 Pierre Busson 3 C. Charlot 3 T. Dahms 3 L. Dobrzynski 3 S. Elgammal 3 R. Granier de Cassagnac 3 M. Haguenauer 3 P. Mine 3 C. Mironov 3 C. Ochando 3 P. Paganini 3 D. Sabes 3 R. Salerno 3 Y. Sirois 3 C. Thiebaux 3 B. Wyslouch 3 A. Zabi 3 J.-L. Agram 4 J. Andrea 4 D. Bloch 4 D. Bodin 4 J.-M. Brom 4 M. Cardaci 4 E.C. Chabert 4 C. Collard 4 E. Conte 4 F. Drouhin 4 C. Ferro 4 J.-C. Fontaine 4 D. Gele 4 U. Goerlach 4 S. Greder 4 P. Juillot 4 M. Karim 4 A.-C. Le Bihan 4 Y. Mikami 4 P. van Hove 4 F. Fassi 5 D. Mercier 5 C. Baty 6 S. Beauceron 6 N. Beaupere 6 M. Bedjidian 6 O. Bondu 6 G. Boudoul 6 D. Boumediene 6 H. Brun 6 J. Chasserat 6 R. Chierici 6 D. Contardo 6 P. Depasse 6 H. El Mamouni 7 J. Fay 6 S. Gascon 6 B. Ille 6 T. Kurca 6 T. Le Grand 6 M. Lethuillier 6 L. Mirabito 6 S. Perries 6 V. Sordini 6 S. Tosi 6 Y. Tschudi 6 P. Verdier 6
Abstract : A comparison of the relative yields of Upsilon resonances in the mu(+) mu(-) decay channel in PbPb and pp collisions at a centre-of-mass energy per nucleon pair of 2.76 TeV, is performed with data collected with the CMS detector at the LHC. Using muons of transverse momentum above 4 GeV/c and pseudorapidity below 2.4, the double ratio of the Upsilon(2S) and Upsilon(3S) excited states to the Upsilon(1S) ground state in PbPb and pp collisions,(Upsilon(2S+3S)/Upsilon(1S)[PbPb])/(Upsilon(2S+3S)/Upsilon(1S)[pp]), is found to be 0.31 - 0.15 + 0.19 (stat.) +/- 0.03 (syst.). The probability to obtain the measured value, or lower, if the true double ratio is unity, has been calculated to be less than 1%.
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Submitted on : Thursday, May 26, 2011 - 7:46:24 AM
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S. Chatrchyan, D. Sillou, M. Besancon, S. Choudhury, M. Dejardin, et al.. Indications of suppression of excited Upsilon states in PbPb collisions at sqrt(s_NN) = 2.76 TeV. Physical Review Letters, American Physical Society, 2011, 107, pp.052302. ⟨10.1103/PhysRevLett.107.052302⟩. ⟨in2p3-00595955⟩

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