Measurement of the b-quark production cross-section in 7 and 13 TeV pp collisions

R. Aaij , L. Beaucourt (1) , M. Chefdeville (1) , D. Decamp (1) , N. Déléage (1) , P. Ghez (1) , J.P. Lees (1) , J.-F. Marchand (1) , M.-N. Minard (1) , B. Pietrzyk (1) , S. t'Jampens (1) , V. Tisserand (1) , E. Tournefier (1) , S. Akar (2) , J. Arnau Romeu (2) , E. Aslanides (2) , J. Cogan (2) , K. De Bruyn (2) , W. Kanso (2) , R. Legac (2) , O. Leroy (2) , G. Mancinelli (2) , M. Martin (2) , A. Mordà (2) , J. Serrano (2) , A. Tayduganov (2) , A. Tsaregorodtsev (2) , Z.J. Ajaltouni (3) , M. Baalouch (3) , E. Cogneras (3) , O. Deschamps (3) , G. Gazzoni (3) , M. Grabalosa Gándara (3) , C. Hadjivasiliou (3) , P. Henrard (3) , M. Kozeiha (3) , R. Lefèvre (3) , S. Monteil (3) , P. Perret (3) , M. Vernet (3)

1 LAPP - Laboratoire d'Annecy de Physique des Particules
2 CPPM - Centre de Physique des Particules de Marseille
3 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand

Measurements of the cross-section for producing \bquark quarks in the reaction pp→bb¯¯X are reported in 7 and 13 TeV collisions at the LHC as a function of the pseudorapidity η in the range 2<η<5 covered by the acceptance of the LHCb experiment. The measurements are done using semileptonic decays of b-flavored hadrons decaying into a ground-state charmed hadron in association with a muon. The cross-sections in the covered η range are 72.0±0.3±6.8 μb and 154.3±1.5±14.3 μb for 7 and 13 TeV. The ratio is 2.14±0.02±0.13, where the quoted uncertainties are statistical and systematic, respectively. The agreement with theoretical expectation is good at 7 TeV, but differs somewhat at 13 TeV. The measured ratio of cross-sections is larger at lower η than the model prediction.

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

R. Aaij, L. Beaucourt, M. Chefdeville, D. Decamp, N. Déléage, et al.. Measurement of the b-quark production cross-section in 7 and 13 TeV pp collisions. Physical Review Letters, 2017, 118, pp.052002. ⟨10.1103/PhysRevLett.118.052002⟩. ⟨in2p3-01417845⟩