The production of the ηc(1S) state in proton proton collisions is probed via its decay to the p p final state with the LHCb detector, in the rapidity range 2.0 < y < 4.5 and in the meson transverse-momentum range pT > 6.5 GeV/c. The cross-section for prompt production of ηc(1S) mesons relative to the prompt J/ψ cross section is measured, for the first time, to be σηc(1S)/σJ/ψ = 1.74 ± 0.29 ± 0.28 ± 0.18B at a centre-of-mass energy √s = 7 TeV using data corresponding to an integrated luminosity of 0.7 fb−1, and σηc(1S)/σJ/ψ = 1.60±0.29±0.25±0.17B at √s = 8 TeV using 2.0 fb−1. The uncertainties quoted are, in order, statistical, systematic, and that on the ratio of branching fractions of the ηc(1S) and J/ψ decays to the p p final state. In addition, the inclusive branching fraction of b-hadron decays into ηc(1S) mesons is measured, for the first time, to be B(b→ηcX) = (4.88 ± 0.64 ± 0.29 ± 0.67B) × 10−3, where the third uncertainty includes also the uncertainty on the J/ψ inclusive branching fraction from bhadron decays. The difference between the J/ψ and ηc(1S) meson masses is determined to be 114.7±1.5±0.1 MeV/c2

Measurement of the η<inf>c</inf>(1S) production cross-section in proton–proton collisions via the decay η<inf>c</inf>(1S) → pp / 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., Anderson, J., et al.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - 75:7(2015). [10.1140/epjc/s10052-015-3502-x]

Measurement of the ηc(1S) production cross-section in proton–proton collisions via the decay ηc(1S) → pp

Casse, G.;SARTI, ALESSIO;SCIUBBA, Adalberto;
2015

Abstract

The production of the ηc(1S) state in proton proton collisions is probed via its decay to the p p final state with the LHCb detector, in the rapidity range 2.0 < y < 4.5 and in the meson transverse-momentum range pT > 6.5 GeV/c. The cross-section for prompt production of ηc(1S) mesons relative to the prompt J/ψ cross section is measured, for the first time, to be σηc(1S)/σJ/ψ = 1.74 ± 0.29 ± 0.28 ± 0.18B at a centre-of-mass energy √s = 7 TeV using data corresponding to an integrated luminosity of 0.7 fb−1, and σηc(1S)/σJ/ψ = 1.60±0.29±0.25±0.17B at √s = 8 TeV using 2.0 fb−1. The uncertainties quoted are, in order, statistical, systematic, and that on the ratio of branching fractions of the ηc(1S) and J/ψ decays to the p p final state. In addition, the inclusive branching fraction of b-hadron decays into ηc(1S) mesons is measured, for the first time, to be B(b→ηcX) = (4.88 ± 0.64 ± 0.29 ± 0.67B) × 10−3, where the third uncertainty includes also the uncertainty on the J/ψ inclusive branching fraction from bhadron decays. The difference between the J/ψ and ηc(1S) meson masses is determined to be 114.7±1.5±0.1 MeV/c2
2015
Transverse Momentum, Systematic Uncertainty, Kinematic Region, Uncertainty Component, Hadron Decay
01 Pubblicazione su rivista::01a Articolo in rivista
Measurement of the η<inf>c</inf>(1S) production cross-section in proton–proton collisions via the decay η<inf>c</inf>(1S) → pp / 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., Anderson, J., et al.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - 75:7(2015). [10.1140/epjc/s10052-015-3502-x]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/836134
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