Measurement of the inelastic pp cross-section at a centre-of-mass energy of s√=7 TeV

R. Aaij (1) , Y. Amhis (2) , S. Barsuk (2) , M. Borsato (2) , O. Kochebina (2) , J. Lefrançois (2) , F. Machefert (2) , A. Martin Sanchez (2) , M. Nicol (2) , P. Robbe (2) , M.-H. Schune (2) , M. Teklishyn (2) , A. Vallier (2) , B. Viaud (2) , L. Beaucourt (3) , M. Chefdeville (3) , D. Decamp (3) , N. Déléage (3) , Ph. Ghez (3) , J.-P. Lees (3) , J.F. Marchand (3) , M.-N. Minard (3) , B. Pietrzyk (3) , W. Qian (3) , S. t'Jampens (3) , V. Tisserand (3) , E. Tournefier (3) , S. Akar (4) , E. Aslanides (4) , J. Cogan (4) , W. Kanso (4) , R. Legac (4) , O. Leroy (4) , G. Mancinelli (4) , A. Mordà (4) , M. Perrin-Terrin (4) , J. Serrano (4) , A. Tsaregorodtsev (4)

1 NIKHEF - National Institute for Subatomic Physics [Amsterdam]
2 LAL - Laboratoire de l'Accélérateur Linéaire
3 LAPP - Laboratoire d'Annecy de Physique des Particules
4 CPPM - Centre de Physique des Particules de Marseille

The cross-section for inelastic proton-proton collisions, with at least one prompt long-lived charged particle of transverse momentum pT>0.2 GeV/c in the pseudorapidity range 2.0<η<4.5, is measured by the LHCb experiment at a centre-of-mass energy of s√=7 TeV. The cross-section in this kinematic range is determined to be σaccinel=55.0±2.4 mb within the spectrometer acceptance with an experimental uncertainty that is dominated by systematic contributions. Extrapolation to the full phase space, using PYTHIA 6, yields σinel=66.9±2.9±4.4 mb, where the first uncertainty is experimental and the second is due to the extrapolation.

Domaines: Physique des Hautes Energies - Expérience [hep-ex]

R. Aaij, Y. Amhis, S. Barsuk, M. Borsato, O. Kochebina, et al.. Measurement of the inelastic pp cross-section at a centre-of-mass energy of s√=7 TeV. Journal of High Energy Physics, 2015, 2015 (02), pp.129. ⟨10.1007/JHEP02(2015)129⟩. ⟨in2p3-01094588⟩