Measurement of prompt J/ψand beauty hadron production cross sections at mid-rapidity in pp collisions at √s = 7 TeV


Journal Article

The ALICE experiment at the LHC has studied J/ψ production at midrapidity in pp collisions at √s = 7TeV through its electron pair decay on a data sample corresponding to an integrated luminosity Lint = 5.6 nb-1. The fraction of J/ψ from the decay of long-lived beauty hadrons was determined for J/ψ candidates with transverse momentum pt > 1.3GeV/c and rapidity |y| < 0.9. The cross section for prompt J/ψ mesons, i.e. directly produced J/ψ and prompt decays of heavier charmonium states such as the ψ(2S) and c resonances, is σprompt J/ψ (pt > 1.3 GeV/c, |y| < 0.9) = 8.3+0.8 (stat.)±} 1.1 (syst.) +1.5 -1.4 (syst. pol.) μb. The cross section for the production of b-hadrons decaying to J/ψ with pt > 1.3GeV/c and |y| < 0.9 is σJ/ψ←hB (pt > 1.3 GeV/c, |y| < 0.9) = 1.46±} 0.38 (stat.) +0.26 -0.32 (syst.) μb. The results are compared to QCD model predictions. The shape of the pt and y distributions of b-quarks predicted by perturbative QCD model calculations are used to extrapolate the measured cross section to derive the bb pair total cross section and dσ/dy at mid-rapidity. © SISSA 2012.

Full Text

Duke Authors

Cited Authors

  • Abelev, B; Adam, J; Adamova, D; Marshall Adare, A; Aggarwal, M; Aglieri Rinella, G; Gabor Agocs, A; Agostinelli, A; Aguilar Salazar, S; Ahammed, Z; Ahmad, A; Ahmad, N; Ahn, SA; Un Ahn, S; Akindinov, A; Aleksandrov, D; Alessandro, B; Molina, JRA; Alici, A; Alkin, A; Avina, EJA; Alme, J; Alt, T; Altini, V; Altinpinar, S; Altsybeev, I; Andrei, C; Andronic, A; Anguelov, V; Anielski, J; Anson, CD; Anticic, T; Antinori, F; Antonioli, P; Aphecetche, LB; Appelshauser, H; Arbor, N; Arcelli, S; Arend, A; Armesto, N; Arnaldi, R; Aronsson, TR; Arsene, IC; Arslandok, M; Asryan, A; Augustinus, A; Averbeck, RP; Awes, T; Aysto, JH; Azmi, MD; Bach, MJ; Badala, A; Baek, YW; Bailhache, RM; Bala, R; Ferroli, RB; Baldisseri, A; Baldit, A; Dos Santos Pedrosa, FB; Ban, J; Baral, RC; Barbera, R; Barile, F; Barnafoldi, GG; Barnby, LS; Barret, V; Bartke, JG; Basile, M; Bastid, N; Basu, S; Bathen, B; Batigne, G; Batyunya, B; Baumann, CH; Bearden, IG; Beck, H; Behera, NK; Belikov, I; Bellini, F; Bellwied, R; Belmont-Moreno, E; Bencedi, G; Beole, S; Berceanu, I; Bercuci, A; Berdnikov, Y; Berenyi, D; Bergognon, AAE; Berzano, D; Betev, L; Bhasin, A; Bhati, AK; Bhom, J; Bianchi, L; Bianchi, N; Bianchin, C; Bielcik, J; Bielcikova, J; Bilandzic, A

Published Date

  • January 1, 2012

Published In

Volume / Issue

  • 2012 / 11

Electronic International Standard Serial Number (EISSN)

  • 1029-8479

International Standard Serial Number (ISSN)

  • 1126-6708

Digital Object Identifier (DOI)

  • 10.1007/JHEP11(2012)065

Citation Source

  • Scopus