A search is performed for the central exclusive production of pairs of charmonia produced in proton-proton collisions. Using data corresponding to an integrated luminosity of 3 fb-1 collected at centre-of-mass energies of 7 and 8 TeV, J/ψJ/ψ and J/ψψ (2S) pairs are observed, which have been produced in the absence of any other activity inside the LHCb acceptance that is sensitive to charged particles in the pseudorapidity ranges (-3.5, -1.5) and (1.5, 5.0). Searches are also performed for pairs of P-wave charmonia and limits are set on their production. The cross-sections for these processes, where the dimeson system has a rapidity between 2.0 and 4.5, are measured to be σJ/ψJ/ψ = 58 ± 10(stat) ± 6(syst) pb, σJ/ψψ(2S) = 63-18+27 (stat) ± 10(syst) pb, σψ(2S)ψ(2S) < 237 pb, σχc0χc0 < 69 nb, σχc1χc1 < 45 pb, σχc2χc2 141 pb, where the upper limits are set at the 90% confidence level. The measured J/ψJ/ψ and J/ψψ (2S) cross-sections are consistent with theoretical expectations.

Observation of charmonium pairs produced exclusively in pp collisions / R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, J. Albrecht, F. Alessio, M. Alexander, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A.A. Alves, S. Amato, S. Amerio, Y. Amhis, L. An, L. Anderlini, J. Anderson, R. Andreassen, M. Andreotti, J.E. Andrews, R.B. Appleby, O. Aquines Gutierrez, F. Archilli, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, M. Baalouch, S. Bachmann, J.J. Back, A. Badalov, W. Baldini, R.J. Barlow, C. Barschel, S. Barsuk, W. Barter, V. Batozskaya, V. Battista, A. Bay, L. Beaucourt, J. Beddow, F. Bedeschi, I. Bediaga, S. Belogurov, K. Belous, I. Belyaev, E. Ben Haim, G. Bencivenni, S. Benson, J. Benton, A. Berezhnoy, R. Bernet, M.O. Bettler, M. Van Beuzekom, A. Bien, S. Bifani, T. Bird, A. Bizzeti, P.M. Bjørnstad, T. Blake, F. Blanc, J. Blouw, S. Blusk, V. Bocci, A. Bondar, N. Bondar, W. Bonivento, S. Borghi, A. Borgia, M. Borsato, T.J.V. Bowcock, E. Bowen, C. Bozzi, T. 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Zhang, A. Zhelezov, A. Zhokhov, L. Zhong, A. Zvyagin. - In: JOURNAL OF PHYSICS. G, NUCLEAR AND PARTICLE PHYSICS. - ISSN 0954-3899. - 41:11(2014 Nov), pp. UNSP 115002.1-UNSP 115002.17. [10.1088/0954-3899/41/11/115002]

Observation of charmonium pairs produced exclusively in pp collisions

N. Neri;F. Palombo;
2014

Abstract

A search is performed for the central exclusive production of pairs of charmonia produced in proton-proton collisions. Using data corresponding to an integrated luminosity of 3 fb-1 collected at centre-of-mass energies of 7 and 8 TeV, J/ψJ/ψ and J/ψψ (2S) pairs are observed, which have been produced in the absence of any other activity inside the LHCb acceptance that is sensitive to charged particles in the pseudorapidity ranges (-3.5, -1.5) and (1.5, 5.0). Searches are also performed for pairs of P-wave charmonia and limits are set on their production. The cross-sections for these processes, where the dimeson system has a rapidity between 2.0 and 4.5, are measured to be σJ/ψJ/ψ = 58 ± 10(stat) ± 6(syst) pb, σJ/ψψ(2S) = 63-18+27 (stat) ± 10(syst) pb, σψ(2S)ψ(2S) < 237 pb, σχc0χc0 < 69 nb, σχc1χc1 < 45 pb, σχc2χc2 141 pb, where the upper limits are set at the 90% confidence level. The measured J/ψJ/ψ and J/ψψ (2S) cross-sections are consistent with theoretical expectations.
charmonia; diffraction; QCD; Nuclear and High Energy Physics
Settore FIS/04 - Fisica Nucleare e Subnucleare
nov-2014
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/268184
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