Observation of associated production of a Z boson with a D meson in the forward region

R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio, M. Alexander, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A. A. Alves, S. Amato, S. Amerio, Y. Amhis, L. Anderlini, J. Anderson, R. Andreassen, M. Andreotti, J. E. AndrewsR. B. Appleby, O. Aquines Gutierrez, F. Archilli, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, M. Baalouch, S. Bachmann, J. J. Back, A. Badalov, V. Balagura, W. Baldini, R. J. Barlow, C. Barschel, S. Barsuk, W. Barter, V. Batozskaya, Th. Bauer, A. Bay, J. Beddow, F. Bedeschi, Laurence Carson, P. E. L. Clarke, G. A. Cowan, Daniel Craik, S. Eisenhardt, F. Muheim, M. Needham, S. Playfer, LHCb collab

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Abstract

A search for associated production of a Z boson with an open charm meson is presented using a data sample, corresponding to an integrated luminosity of 1.0 fb(-1) of proton-proton collisions at a centre-of-mass energy of 7 TeV, collected by the LHCb experiment. Seven candidate events for associated production of a Z boson with a D-0 meson and four candidate events for a Z boson with a D+ meson are observed with a combined significance of 5.1 standard deviations. The production cross-sections in the forward region are measured to be

sigmaZ ->mu+mu-,D0 = 2.50 +/- 1.12 +/- 0.22 pb

sigmaZ ->mu+mu-,D+ = 0.44 +/- 0.23 +/- 0.03 pb,

where the first uncertainty is statistical and the second systematic.

Original languageEnglish
Article number91
Number of pages17
JournalJournal of High Energy Physics
Issue number4
DOIs
Publication statusPublished - 14 Apr 2014

Keywords

  • Hadron-Hadron Scattering
  • Heavy quark production
  • Forward physics
  • Particle and resonance production
  • DOUBLE-PARTON SCATTERING
  • PAIR PRODUCTION
  • PP COLLISIONS
  • LHC
  • TEV
  • DISTRIBUTIONS

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