Measurement of psi(2S) meson production in pp collisions at sqrt(s)=7 TeV

R. Aaij; S. Barsuk; O. Callot; J. He; B. Jean-Marie; J. Lefrançois; F. Machefert; A. Martin Sanchez; M. Nicol; P. Robbe; M.-H. Schune; B. Viaud; I. Videau; E. Ben-Haim; M. Benayoun; P. David; L. Del Buono; A. Martens; Z. Ajaltouni; O. Deschamps; P. Henrard; M. Jahjah Hussein; R. Lefèvre; L. Li Gioi; S. Monteil; V. Niess; P. Perret; D. Roa Romero; K. Sobczak; C. Adrover; E. Aslanides; J. Cogan; B. Khanji; R. Legac; O. Leroy; G. Mancinelli; E. Maurice; M. Perrin-Terrin; M. Sapunov; J. Serrano; A. Tsaregorodtsev; I. De Bonis; D. Decamp; Ph. Ghez; P. Hopchev; J.-P. Lees; I.V. Machikhiliyan; M.-N. Minard; B. Pietrzyk; S. T'Jampens; V. Tisserand; E. Tournefier

HAL: in2p3-00737843, version 1

arXiv: 1204.1258

DOI: 10.1140/epjc/s10052-012-2100-4

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European Physical Journal C: Particles and Fields 72 (2012) 2100

Measurement of psi(2S) meson production in pp collisions at sqrt(s)=7 TeV

R. Aaij, S. Barsuk¹, O. Callot¹, J. He¹, B. Jean-Marie¹, J. Lefrançois¹, F. Machefert¹, A. Martin Sanchez¹, M. Nicol¹, P. Robbe¹, M.-H. Schune¹, B. Viaud¹, I. Videau¹, E. Ben-Haim², M. Benayoun², P. David², L. Del Buono², A. Martens², Z. Ajaltouni³, O. Deschamps³, P. Henrard³, M. Jahjah Hussein³, R. Lefèvre³, L. Li Gioi³, S. Monteil³, V. Niess³, P. Perret³, D. Roa Romero³, K. Sobczak³, C. Adrover⁴, E. Aslanides⁴, J. Cogan⁴, B. Khanji⁴, R. Legac⁴, O. Leroy⁴, G. Mancinelli⁴, E. Maurice⁴, M. Perrin-Terrin⁴, M. Sapunov⁴, J. Serrano⁴, A. Tsaregorodtsev⁴, I. De Bonis⁵, D. Decamp⁵, Ph. Ghez⁵, P. Hopchev⁵, J.-P. Lees⁵, I.V. Machikhiliyan⁵, M.-N. Minard⁵, B. Pietrzyk⁵, S. T'Jampens⁵, V. Tisserand⁵, E. Tournefier⁵

For the LHCb collaboration(s)

(2012)

The differential cross-section for the inclusive production of psi(2S) mesons in pp collisions at sqrt(s)=7 TeV has been measured with the LHCb detector. The data sample corresponds to an integrated luminosity of 36 pb-1. The psi(2S) mesons are reconstructed in the decay channels psi(2S) -> mu+ mu- and psi(2S) -> J/psi pi+ pi-, with the J/psi meson decaying into two muons. Results are presented both for promptly produced psi(2S) mesons and for those originating from b-hadron decays. In the kinematic range pT(psi(2S)) <= 16 GeV/c and 2 < y(psi(2S)) <= 4.5 we measure 1.44 +- 0.01 +- 0.12+0.2-0.4 mub for prompt psi(2S) production and 0.25 +- 0.01 +- 0.02 mub for psi(2S) from b-hadron decays, where the last uncertainty on the prompt cross-section is due to the unknown psi(2S) polarization. Recent QCD calculations are found to be in good agreement with our measurements. Combining the present result with the LHCb J/psi measurements we determine the inclusive branching fraction B(b -> psi(2S) X) = (2.73 +- 0.06 +- 0.16 +- 0.24) x 10^(-3), where the last uncertainty is due to the B(b -> J/psi X), B(J/psi -> mu+ mu-) and B(psi(2S) -> e+ e-) branching fraction uncertainties.

1:	LAL - Laboratoire de l'Accélérateur Linéaire

2:	LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies

3:	LPC-CLERMONT - Laboratoire de Physique Corpusculaire de Clermont-Ferrand

4:	CPPM - Centre de Physique des Particules de Marseille

5:	LAPP - Laboratoire d'Annecy le Vieux de Physique des Particules

Subject(s)

Physics/High Energy Physics - Experiment

Fulltext link:

http://fr.arXiv.org/abs/1204.1258


in2p3-00737843, version 1
http://hal.in2p3.fr/in2p3-00737843
oai:hal.in2p3.fr:in2p3-00737843
From: Françoise Marechal <>
Submitted on: Tuesday, 2 October 2012 16:33:01
Updated on: Tuesday, 23 October 2012 15:10:07