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

LHCb Collaboration; 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. 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; C. Baesso; W. Baldini; R. J. Barlow; C. Barschel; S. Bifani; N. Farley; P. Griffith; P. Ilten; I. R. Kenyon; C. Lazzeroni; A. Mazurov; J. McCarthy; C. J. Parkinson; L. Pescatore; D. Popov; N. K. Watson

doi:10.1140/epjc/s10052-015-3502-x

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

LHCb Collaboration, 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. AnderliniJ. 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, C. Baesso, W. Baldini, R. J. Barlow, C. Barschel, S. Bifani, N. Farley, P. Griffith, P. Ilten, I. R. Kenyon, C. Lazzeroni, A. Mazurov, J. McCarthy, C. J. Parkinson, L. Pescatore, D. Popov, N. K. Watson

Physics and Astronomy

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Abstract

The production of the η_c(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_T > 6.5 GeV/c. The cross-section for prompt production of η_c(1S) mesons relative to the prompt J/ψ cross-section is measured, for the first time, to be σ_ηc(1S)/σ_J/ψ = 1.74±0.29±0.28±0. 18_B at a centre-of-mass energy √s=7 TeV using data corresponding to an integrated luminosity of 0.7 fb^-1, and σ_ηc(1S)/σJ/ψ = 1.60±0.29±0.25±0.17_B 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 η_c(1S) and J/ψ decays to the pp^- final state. In addition, the inclusive branching fraction of b-hadron decays into η_c(1S) mesons is measured, for the first time, to be B(b→η_cX)=(4.88±0.64±0.29±0.67_B)×^10-3, 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_c(1S) meson masses is determined to be 114.7±1.5±0.1MeV/c².

Original language	English
Article number	311
Number of pages	12
Journal	European Physical Journal C
Volume	75
Issue number	7
DOIs	https://doi.org/10.1140/epjc/s10052-015-3502-x
Publication status	Published - 4 Jul 2015

Keywords

Transverse Momentum
Systematic Uncertainty
Kinematic Region
Uncertainty Component
Hadron Decay

ASJC Scopus subject areas

Engineering (miscellaneous)
Physics and Astronomy (miscellaneous)

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Cite this

LHCb Collaboration, 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., ... Watson, N. K. (2015). Measurement of the η_c(1S) production cross-section in proton–proton collisions via the decay η_c(1S) → pp^-. European Physical Journal C, 75(7), Article 311. https://doi.org/10.1140/epjc/s10052-015-3502-x

@article{12b90ea53b3844a18b707cacdce64c1c,

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

abstract = "The production of the ηc(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 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 pp- 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 b-hadron decays. The difference between the J/ψ and ηc(1S) meson masses is determined to be 114.7±1.5±0.1MeV/c2.",

keywords = "Transverse Momentum, Systematic Uncertainty, Kinematic Region, Uncertainty Component, Hadron Decay",

author = "{LHCb Collaboration} and R. Aaij and Beteta, {C. Abell{\'a}n} and B. Adeva and M. Adinolfi and A. Affolder and Z. Ajaltouni and S. Akar and J. Albrecht and F. Alessio and M. Alexander and S. Ali and G. Alkhazov and {Alvarez Cartelle}, P. and Alves, {A. A.} and S. Amato and S. Amerio and Y. Amhis and L. An and L. Anderlini and J. Anderson and R. Andreassen and M. Andreotti and Andrews, {J. E.} and Appleby, {R. B.} and {Aquines Gutierrez}, O. and F. Archilli and A. Artamonov and M. Artuso and E. Aslanides and G. Auriemma and M. Baalouch and S. Bachmann and Back, {J. J.} and A. Badalov and C. Baesso and W. Baldini and Barlow, {R. J.} and C. Barschel and S. Bifani and N. Farley and P. Griffith and P. Ilten and Kenyon, {I. R.} and C. Lazzeroni and A. Mazurov and J. McCarthy and Parkinson, {C. J.} and L. Pescatore and D. Popov and Watson, {N. K.}",

year = "2015",

month = jul,

day = "4",

doi = "10.1140/epjc/s10052-015-3502-x",

language = "English",

volume = "75",

journal = "European Physical Journal C",

issn = "1434-6044",

publisher = "Springer",

number = "7",

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LHCb Collaboration, Aaij, R, Beteta, CA, Adeva, B, Adinolfi, M, Affolder, A, Ajaltouni, Z, Akar, S, Albrecht, J, Alessio, F, Alexander, M, Ali, S, Alkhazov, G, Alvarez Cartelle, P, Alves, AA, Amato, S, Amerio, S, Amhis, Y, An, L, Anderlini, L, Anderson, J, Andreassen, R, Andreotti, M, Andrews, JE, Appleby, RB, Aquines Gutierrez, O, Archilli, F, Artamonov, A, Artuso, M, Aslanides, E, Auriemma, G, Baalouch, M, Bachmann, S, Back, JJ, Badalov, A, Baesso, C, Baldini, W, Barlow, RJ, Barschel, C, Bifani, S, Farley, N, Griffith, P, Ilten, P, Kenyon, IR, Lazzeroni, C, Mazurov, A, McCarthy, J, Parkinson, CJ, Pescatore, L, Popov, D & Watson, NK 2015, 'Measurement of the η_c(1S) production cross-section in proton–proton collisions via the decay η_c(1S) → pp^-', European Physical Journal C, vol. 75, no. 7, 311. https://doi.org/10.1140/epjc/s10052-015-3502-x

TY - JOUR

T1 - Measurement of the ηc(1S) production cross-section in proton–proton collisions via the decay ηc(1S) → pp-

AU - LHCb Collaboration

AU - Aaij, R.

AU - Beteta, C. Abellán

AU - Adeva, B.

AU - Adinolfi, M.

AU - Affolder, A.

AU - Ajaltouni, Z.

AU - Akar, S.

AU - Albrecht, J.

AU - Alessio, F.

AU - Alexander, M.

AU - Ali, S.

AU - Alkhazov, G.

AU - Alvarez Cartelle, P.

AU - Alves, A. A.

AU - Amato, S.

AU - Amerio, S.

AU - Amhis, Y.

AU - An, L.

AU - Anderlini, L.

AU - Anderson, J.

AU - Andreassen, R.

AU - Andreotti, M.

AU - Andrews, J. E.

AU - Appleby, R. B.

AU - Aquines Gutierrez, O.

AU - Archilli, F.

AU - Artamonov, A.

AU - Artuso, M.

AU - Aslanides, E.

AU - Auriemma, G.

AU - Baalouch, M.

AU - Bachmann, S.

AU - Back, J. J.

AU - Badalov, A.

AU - Baesso, C.

AU - Baldini, W.

AU - Barlow, R. J.

AU - Barschel, C.

AU - Bifani, S.

AU - Farley, N.

AU - Griffith, P.

AU - Ilten, P.

AU - Kenyon, I. R.

AU - Lazzeroni, C.

AU - Mazurov, A.

AU - McCarthy, J.

AU - Parkinson, C. J.

AU - Pescatore, L.

AU - Popov, D.

AU - Watson, N. K.

PY - 2015/7/4

Y1 - 2015/7/4

N2 - The production of the ηc(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 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 pp- 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 b-hadron decays. The difference between the J/ψ and ηc(1S) meson masses is determined to be 114.7±1.5±0.1MeV/c2.

AB - The production of the ηc(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 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 pp- 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 b-hadron decays. The difference between the J/ψ and ηc(1S) meson masses is determined to be 114.7±1.5±0.1MeV/c2.

KW - Transverse Momentum

KW - Systematic Uncertainty

KW - Kinematic Region

KW - Uncertainty Component

KW - Hadron Decay

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U2 - 10.1140/epjc/s10052-015-3502-x

DO - 10.1140/epjc/s10052-015-3502-x

M3 - Article

AN - SCOPUS:84940556641

SN - 1434-6044

VL - 75

JO - European Physical Journal C

JF - European Physical Journal C

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