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Measurement of the X(3872) production cross section via decays to J/psi pi pi in pp collisions at sqrt(s) = 7 TeV

S. Chatrchyan M. Besançon 1 S. Choudhury 1 M. Dejardin 1 D. Denegri 1 B. Fabbro 1 J.L. Faure 1 F. Ferri 1 S. Ganjour 1 A. Givernaud 1 P. Gras 1 G. Hamel de Monchenault 1 P. Jarry 1 E. Locci 1 J. Malcles 1 L. Millischer 1 A. Nayak 1 J. Rander 1 A. Rosowsky 1 M. Titov 1 S. Baffioni 2 F. Beaudette 2 L. Benhabib 2 L. Bianchini 2 M. Bluj 2 Pierre Busson 2 C. Charlot 2 N. Daci 2 T. Dahms 2 M. Dalchenko 2 L. Dobrzynski 2 A. Florent 2 R. Granier de Cassagnac 2 M. Haguenauer 2 P. Mine 2 C. Mironov 2 I.N. Naranjo 2 M. Nguyen 2 C. Ochando 2 P. Paganini 2 D. Sabes 2 R. Salerno 2 Y. Sirois 2 C. Veelken 2 A. Zabi 2 J.-L. Agram 3 J. Andrea 3 D. Bloch 3 D. Bodin 3 J.-M. Brom 3 M. Cardaci 3 E.C. Chabert 3 C. Collard 3 E. Conte 3 F. Drouhin 3 J.-C. Fontaine 3 D. Gele 3 U. Goerlach 3 P. Juillot 3 A.-C. Le Bihan 3 P. van Hove 3 S. Beauceron 4 N. Beaupere 4 O. Bondu 4 G. Boudoul 4 S. Brochet 4 J. Chasserat 4 R. Chierici 4 D. Contardo 4 P. Depasse 4 H. El Mamouni 4 J. Fay 4 S. Gascon 4 M. Gouzevitch 4 B. Ille 4 T. Kurca 4 M. Lethuillier 4 L. Mirabito 4 S. Perries 4 L. Sgandurra 4 V. Sordini 4 Y. Tschudi 4 P. Verdier 4 S. Viret 4 
Abstract : The production of the X(3872) is studied in pp collisions at sqrt(s) = 7 TeV, using decays to J/psi pi pi, where the J/psi decays to two muons. The data were recorded by the CMS experiment and correspond to an integrated luminosity of 4.8 inverse femtobarns. The measurements are performed in a kinematic range in which the X(3872) candidates have a transverse momentum 10 < pt < 50 GeV and rapidity abs(y) < 1.2. The ratio of the X(3872) and psi(2S) cross sections times their branching fractions into J/psi pi pi is measured as a function of pt. In addition, the fraction of X(3872) originating from B decays is determined. From these measurements the prompt X(3872) differential cross section times branching fraction as a function of pt is extracted. The pi pi mass spectrum of the J/psi pi pi system in the X(3872) decays is also investigated.
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Submitted on : Tuesday, February 19, 2013 - 7:19:31 AM
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S. Chatrchyan, M. Besançon, S. Choudhury, M. Dejardin, D. Denegri, et al.. Measurement of the X(3872) production cross section via decays to J/psi pi pi in pp collisions at sqrt(s) = 7 TeV. Journal of High Energy Physics, Springer, 2013, 04(2013), pp.154. ⟨10.1007/JHEP04(2013)154⟩. ⟨in2p3-00789895⟩

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