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Measurements of the Lambda_b0 -> J/psi Lambda decay amplitudes and the Lambda_b0 polarisation in pp collisions at sqrt(s) = 7 TeV

By R. Aaij, Y. Amhis, S. Barsuk, O. Callot, J. He, O. Kochebina, J. Lefrançois, F. Machefert, A. Martin Sanchez, Marie Nicol, P. Robbe, M.-H. Schune, M. Teklishyn, B. Viaud, E. Ben-Haim, M. Benayoun, P. David, L. Del Buono, A. Martens, F. Polci, Ziad Ajaltouni, O. Deschamps, E. Cogneras, I. El Rifai, M. Grabalosa Gándara, Pierre Henrard, M. Hoballah, R. Lefèvre, L. Li Gioi, S. Monteil, V. Niess, Pascal Perret, Diego Alejandro Roa Romero, I. De Bonis, D. Decamp, Ph. Ghez, P. Hopchev, J.-P. Lees, I.V. Machikhiliyan, M.-N. Minard, B. Pietrzyk, W. Qian, S. T'Jampens, V. Tisserand, E. Tournefier, C. Adrover, E. Aslanides, J. Cogan, R. Legac, O. Leroy, G. Mancinelli, E. Maurice, M. Perrin-Terrin, M. Sapunov, J. Serrano and A. Tsaregorodtsev

Abstract

Submitted to Physics Letters B - See paper for full list of authorsAn angular analysis of Lambda_b0 -> J/psi Lambda decays is performed using a data sample corresponding to 1.0 fb^{-1} collected in pp collisions at sqrt(s) = 7 TeV with the LHCb detector at the LHC. A parity violating asymmetry characterising the Lambda_b0 -> J/psi Lambda decay of -0.04 +/- 0.17 +/- 0.07 and a Lambda_b0 transverse production polarisation of 0.05 +/- 0.07 +/- 0.02 are measured, where the first uncertainty is statistical and the second systematic

Topics: [ PHYS.HEXP ] Physics [physics]/High Energy Physics - Experiment [hep-ex]
Publisher: Elsevier
Year: 2013
DOI identifier: 10.1016/j.physletb.2013.05.041
OAI identifier: oai:HAL:in2p3-00794266v1
Provided by: Hal-Diderot
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