Observation of J/psi-pair production in pp collisions at root s=7 TeV
- Aaij, R.
- Adeva, B.
- Adinolfi, M.
- Adrover, C.
- Affolder, A.
- Ajaltouni, Z.
- Albrecht, J.
- Alessio, F.
- Alexander, M.
- Alkhazov, G.
- Alvarez Cartelle, P.
- Alves, A. A.
- Amato, S.
- Amhis, Y.
- Appleby, R. B.
- Aquines Gutierrez, O.
- Archilli, F.
- Arrabito, L.
- Artamonov, A.
- Artuso, M.
- Aslanides, E.
- Auriemma, G.
- Bachmann, S.
- Back, J. J.
- Bailey, D. S.
- Balagura, V.
- Baldini, W.
- Barlow, R. J.
- Barschel, C.
- Barsuk, S.
- Barter, W.
- Bates, A.
- Bauer, C.
- Bauer, Th.
- Bediaga, I.
- Belous, K.
- Belyaev, I.
- Ben-Haim, E.
- Benayoun, M.
- Bencivenni, G.
- Benson, S.
- Benton, J.
- Bernet, R.
- Bettler, M. -O
- van Beuzekom, M.
- Bien, A.
- Bifani, S.
- Bizzeti, A.
- Bjornstad, P. M.
- Pellegrino, A.
Publication date
January 2012
DOIAbstract
The production of J/psi pairs in proton-proton collisions at a centre-of-mass energy of 7 TeV has been observed using an integrated luminosity of 37.5 pb(-1) collected with the LHCb detector. The production cross-section for pairs with both J/psi in the rapidity range 2 <y(J/psi) <4.5 and transverse momentum p(T)(J/psi) <10 GeV/c is sigma(J/psi J/psi) = 5.1 +/- 1.0 +/- 1.1 nb, where the first uncertainty is statistical and the second systematic. (C) 2011 CERN. Published by Elsevier B.V. All rights reserved
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