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arXiv · 1103.0423

Measurement of J/psi production in pp collisions at sqrt(s)=7 TeV

LHCb Collaboration·R. Aaij·B. Adeva·M. Adinolfi·C. Adrover·A. Affolder·Z. Ajaltouni·J. Albrecht·F. Alessio·M. Alexander·P. Alvarez Cartelle·A. A. Alves Jr·S. Amato·Y. Amhis·J. Amoraal·J. Anderson·R. B. Appleby·O. Aquines Gutierrez·L. Arrabito·M. Artuso·E. Aslanides·G. Auriemma·S. Bachmann·D. S. Bailey·V. Balagura·W. Baldini·R. J. Barlow·C. Barschel·S. Barsuk·A. Bates·C. Bauer·Th. Bauer·A. Bay·I. Bediaga·K. Belous·I. Belyaev·E. Ben-Haim·M. Benayoun·G. Bencivenni·R. Bernet·M. -O. Bettler·M. van Beuzekom·S. Bifani·A. Bizzeti·P. M. Bjørnstad·T. Blake·F. Blanc·C. Blanks·J. Blouw·S. Blusk·A. Bobrov·V. Bocci·A. Bondar·N. Bondar·W. Bonivento·S. Borghi·A. Borgia·E. Bos·T. J. V. Bowcock·C. Bozzi·T. Brambach·J. van den Brand·J. Bressieux·S. Brisbane·M. Britsch·T. Britton·N. H. Brook·H. Brown·A. Büchler-Germann·A. Bursche·J. Buytaert·S. Cadeddu·J. M. Caicedo Carvajal·O. Callot·M. Calvi·M. Calvo Gomez·A. Camboni·P. Campana·A. Carbone·G. Carboni·R. Cardinale·A. Cardini·L. Carson·K. Carvalho Akiba·G. Casse·M. Cattaneo·M. Charles·Ph. Charpentier·N. Chiapolini·X. Cid Vidal·P. J. Clark·P. E. L. Clarke·M. Clemencic·H. V. Cliff·J. Closier·C. Coca·V. Coco·J. Cogan·P. Collins·F. Constantin
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Abstract

The production of J/psi mesons in proton-proton collisions at sqrt(s)=7 TeV is studied with the LHCb detector at the LHC. The differential cross-section for prompt J/psi production is measured as a function of the J/psi transverse momentum pT and rapidity y in the fiducial region 0<pT<14 GeV/c and 2.0<y<4.5. The differential cross-section and fraction of J/psi from b-hadron decays are also measured in the same pT and y ranges. The analysis is based on a data sample corresponding to an integrated luminosity of 5.2pb-1. The measured cross-sections integrated over the fiducial region are 10.52 +/- 0.04 +/- 1.40 +1.64/-2.20 mub for prompt J/psi production and 1.14 +/- 0.01 +/- 0.16 mub for J/psi from b-hadron decays, where the first uncertainty is statistical and the second systematic. The prompt J/psi production cross-section is obtained assuming no J/psi polarisation and the third error indicates the acceptance uncertainty due to this assumption.

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LHCb Collaboration, R. Aaij, B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio, M. Alexander, P. Alvarez Cartelle, A. A. Alves Jr, S. Amato, Y. Amhis, J. Amoraal, J. Anderson, R. B. Appleby, O. Aquines Gutierrez, L. Arrabito, M. Artuso, E. Aslanides, G. Auriemma, S. Bachmann, D. S. Bailey, V. Balagura, W. Baldini, R. J. Barlow, C. Barschel, S. Barsuk, A. Bates, C. Bauer, Th. Bauer, A. Bay, I. Bediaga, K. Belous, I. Belyaev, E. Ben-Haim, M. Benayoun, G. Bencivenni, R. Bernet, M. -O. Bettler, M. van Beuzekom, S. Bifani, A. Bizzeti, P. M. Bjørnstad, T. Blake, F. Blanc, C. Blanks, J. Blouw, S. Blusk, A. Bobrov, V. Bocci, A. Bondar, N. Bondar, W. Bonivento, S. Borghi, A. Borgia, E. Bos, T. J. V. Bowcock, C. Bozzi, T. Brambach, J. van den Brand, J. Bressieux, S. Brisbane, M. Britsch, T. Britton, N. H. Brook, H. Brown, A. Büchler-Germann, A. Bursche, J. Buytaert, S. Cadeddu, J. M. Caicedo Carvajal, O. Callot, M. Calvi, M. Calvo Gomez, A. Camboni, P. Campana, A. Carbone, G. Carboni, R. Cardinale, A. Cardini, L. Carson, K. Carvalho Akiba, G. Casse, M. Cattaneo, M. Charles, Ph. Charpentier, N. Chiapolini, X. Cid Vidal, P. J. Clark, P. E. L. Clarke, M. Clemencic, H. V. Cliff, J. Closier, C. Coca, V. Coco, J. Cogan, P. Collins, F. Constantin. 2011-05-19. Measurement of J/psi production in pp collisions at sqrt(s)=7 TeV. https://doi.org/10.1140/epjc%2Fs10052-011-1645-y

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