Measurement of the η<inf>c</inf>(1S) production cross-section in proton–proton collisions via the decay η<inf>c</inf>(1S) → pp

R. Aaij, C. Abellán Beteta, 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. AndersonR. 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, C. Baesso, 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. Brambach, J. Bressieux, D. Brett, M. Britsch, T. Britton, J. Brodzicka, N. H. Brook, H. Brown, A. Bursche, G. Busetto, J. Buytaert, S. Cadeddu, R. Calabrese, M. Calvi, M. Calvo Gomez, P. Campana, D. Campora Perez, A. Carbone, G. Carboni

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Abstract

© 2015, CERN for the benefit of the LHCb collaboration. The production of the η<inf>c</inf>(1S) state in proton-proton collisions is probed via its decay to the pp final state with the LHCb detector, in the rapidity range 2.0 < y < 4.5 and in the meson transverse-momentum range p<inf>T</inf> > 6.5 GeV/c. The cross-section for prompt production of η<inf>c;</inf>(1S) mesons relative to the prompt J/ψ cross-section is measured, for the first time, to be σ<inf>ηc(1S)</inf>/σ<inf>J/ψ</inf> = 1.74±0.29±0.28±0. 18<inf>B</inf> at a centre-of-mass energy (Formula presented.) using data corresponding to an integrated luminosity of 0.7 fb<sup>-1</sup>, and σ<inf>ηc</inf>(1S)/σJ/ψ = 1.60±0.29±0.25±0.17<inf>B</inf> at (Formula presented.) using 2.0 fb<sup>-1</sup>. The uncertainties quoted are, in order, statistical, systematic, and that on the ratio of branching fractions of the η<inf>c</inf>(1S) and J/ψ decays to the pp final state. In addition, the inclusive branching fraction of b-hadron decays into η<inf>c</inf>(1S) mesons is measured, for the first time, to be B(b→η<inf>c</inf>X)=(4.88±0.64±0.29±0.67<inf>B</inf>)×<sup>10-3</sup>, where the third uncertainty includes also the uncertainty on the J/ψ inclusive branching fraction from b-hadron decays. The difference between the J/ψ and η<inf>c</inf>(1S) meson masses is determined to be 114.7±1.5±0.1MeV/c<sup>2</sup>.
Original languageEnglish
JournalEuropean Physical Journal C
DOIs
Publication statusPublished - 28 Jul 2015
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Engineering (miscellaneous)
  • Physics and Astronomy (miscellaneous)

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    Aaij, R., Beteta, C. A., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Ali, S., Alkhazov, G., Alvarez Cartelle, P., Alves, A. A., Amato, S., Amerio, S., Amhis, Y., An, L., Anderlini, L., ... Carboni, G. (2015). Measurement of the η<inf>c</inf>(1S) production cross-section in proton–proton collisions via the decay η<inf>c</inf>(1S) → pp. European Physical Journal C. https://doi.org/10.1140/epjc/s10052-015-3502-x