782 articles – 3139 references  [version française]
HAL: in2p3-00727742, version 1

Detailed view  Export this paper
Journal of High Energy Physics 11 (2012) 31
Measurement of the fraction of \Y1S originating from \chib1P decays 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, I. De Bonis3, D. Decamp3, Ph. Ghez3, P. Hopchev3, J.-P. Lees3, I.V. Machikhiliyan3, M.-N. Minard3, B. Pietrzyk3, S. T'Jampens3, V. Tisserand3, E. Tournefier3, C. Adrover4, E. Aslanides4, J. Cogan4, B. Khanji4, R. Le Gac4, O. Leroy4, G. Mancinelli4, E. Maurice4, M. Perrin-Terrin4, M. Sapunov4, J. Serrano4, A. Tsaregorodtsev4, Z J Ajaltouni5, E. Cogneras5, O. Deschamps5, I. El Rifai5, P. Henrard5, M. Hoballah5, M. Jahjah Hussein5, R. Lefèvre5, L. Li Gioi5, S. Monteil5, V. Niess5, Pascal Perret5, D. Roa Romero5, K. Sobczak5
For the LHCb collaboration(s)

The production of \chib1P mesons in $pp$ collisions at a centre-of-mass energy of $7\tev$ is studied using $32\invpb$ of data collected with the \lhcb detector. The $\chib1P$ mesons are reconstructed in the decay mode $\chib1P \to \Y1S\g \to \mumu\g$. The fraction of \Y1S originating from \chib1P decays in the \Y1S transverse momentum range $6 < \pt^{\Y1S} < 15\gevc$ and rapidity range $2.0 < y^{\Y1S} < 4.5$ is measured to be $(20.7\pm 5.7\pm 2.1^{+2.7}_{-5.4})%$, where the first uncertainty is statistical, the second is systematic and the last gives the range of the result due to the unknown \Y1S and \chib1P polarizations.
1:  LAL - Laboratoire de l'Accélérateur Linéaire
2:  LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
3:  LAPP - Laboratoire d'Annecy le Vieux de Physique des Particules
4:  CPPM - Centre de Physique des Particules de Marseille
5:  LPC - Laboratoire de Physique Corpusculaire [Clermont-Ferrand]
Physics/High Energy Physics - Experiment
Fulltext link: