Measurement of the ratio of prompt chi(c) to J/psi production in pp collisions at root s=7 TeV

LHCb collaboration; Valerie Gibson

doi:10.1016/j.physletb.2012.10.068

Measurement of the ratio of prompt chi(c) to J/psi production in pp collisions at root s=7 TeV

LHCb collaboration
, Valerie Gibson^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

Abstract

The prompt production of charmonium chi(c) and J/psi states is studied in proton-proton collisions at a centre-of-mass energy of root s = 7 TeV at the Large Hadron Collider. The chi(c) and J/psi mesons are identified through their decays chi(c) -> J/psi gamma and J/psi -> mu(+)mu(-) using 36 pb(-1) of data collected by the LHCb detector in 2010. The ratio of the prompt production cross-sections for chi(c) and J/psi, sigma(chi(c) -> J/psi gamma)/sigma(J/psi). is determined as a function of the J/psi, transverse momentum in the range 2 < P-T(J/psi) < 15 GeV/c. The results are in excellent agreement with next-to-leading order non-relativistic expectations and show a significant discrepancy compared with the colour singlet model prediction at leading order, especially in the low P-T(J/psi) region. (C) 2012 CERN. Published by Elsevier B.V. All rights reserved.

Original language	English
Pages (from-to)	431-440
Number of pages	10
Journal	Physics Letters B
Volume	718
Issue number	2
DOIs	https://doi.org/10.1016/j.physletb.2012.10.068
Publication status	Published - 5 Dec 2012
Externally published	Yes

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@article{46bf6918e7414b27883a2b208b99d52f,

title = "Measurement of the ratio of prompt chi(c) to J/psi production in pp collisions at root s=7 TeV",

abstract = "The prompt production of charmonium chi(c) and J/psi states is studied in proton-proton collisions at a centre-of-mass energy of root s = 7 TeV at the Large Hadron Collider. The chi(c) and J/psi mesons are identified through their decays chi(c) -> J/psi gamma and J/psi -> mu(+)mu(-) using 36 pb(-1) of data collected by the LHCb detector in 2010. The ratio of the prompt production cross-sections for chi(c) and J/psi, sigma(chi(c) -> J/psi gamma)/sigma(J/psi). is determined as a function of the J/psi, transverse momentum in the range 2 < P-T(J/psi) < 15 GeV/c. The results are in excellent agreement with next-to-leading order non-relativistic expectations and show a significant discrepancy compared with the colour singlet model prediction at leading order, especially in the low P-T(J/psi) region. (C) 2012 CERN. Published by Elsevier B.V. All rights reserved.",

author = "R. Aaij and C.A. Beteta and B. Adeva and M. Adinolfi and C. Adrover and A. Affolder and Z. Ajaltouni and J. Albrecht and F. Alessio and M. Alexander and S. Ali and G. Alkhazov and P.A. Cartelle and A.A. Alves and S. Amato and Y. Amhis and J. Anderson and R.B. Appleby and O.A. Gutierrez and F. Archilli and L. Arrabito and A. Artamonov and M. Artuso and E. Aslanides and G. Auriemma and S. Bachmann and J.J. Back and V. Balagura and W. Baldini and R.J. Barlow and C. Barschel and S. Barsuk and W. Barter and A. Bates and C. Bauer and T. Bauer and A. Bay and I. Bediaga and S. Belogurov and K. Belous and I. Belyaev and E. Ben-Haim and M. Benayoun and G. Bencivenni and S. Benson and J. Benton and R. Bernet and M.O. Bettler and \{van Beuzekom\}, M. and \{van den Brand\}, J. and \{LHCb collaboration\} and Valerie Gibson",

year = "2012",

month = dec,

day = "5",

doi = "10.1016/j.physletb.2012.10.068",

language = "English",

volume = "718",

pages = "431--440",

journal = "Physics Letters B",

issn = "0370-2693",

publisher = "Elsevier B.V.",

number = "2",

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TY - JOUR

T1 - Measurement of the ratio of prompt chi(c) to J/psi production in pp collisions at root s=7 TeV

AU - Aaij, R.

AU - Beteta, C.A.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Adrover, C.

AU - Affolder, A.

AU - Ajaltouni, Z.

AU - Albrecht, J.

AU - Alessio, F.

AU - Alexander, M.

AU - Ali, S.

AU - Alkhazov, G.

AU - Cartelle, P.A.

AU - Alves, A.A.

AU - Amato, S.

AU - Amhis, Y.

AU - Anderson, J.

AU - Appleby, R.B.

AU - Gutierrez, O.A.

AU - Archilli, F.

AU - Arrabito, L.

AU - Artamonov, A.

AU - Artuso, M.

AU - Aslanides, E.

AU - Auriemma, G.

AU - Bachmann, S.

AU - Back, J.J.

AU - Balagura, V.

AU - Baldini, W.

AU - Barlow, R.J.

AU - Barschel, C.

AU - Barsuk, S.

AU - Barter, W.

AU - Bates, A.

AU - Bauer, C.

AU - Bauer, T.

AU - Bay, A.

AU - Bediaga, I.

AU - Belogurov, S.

AU - Belous, K.

AU - Belyaev, I.

AU - Ben-Haim, E.

AU - Benayoun, M.

AU - Bencivenni, G.

AU - Benson, S.

AU - Benton, J.

AU - Bernet, R.

AU - Bettler, M.O.

AU - van Beuzekom, M.

AU - van den Brand, J.

AU - LHCb collaboration

AU - Gibson, Valerie

PY - 2012/12/5

Y1 - 2012/12/5

N2 - The prompt production of charmonium chi(c) and J/psi states is studied in proton-proton collisions at a centre-of-mass energy of root s = 7 TeV at the Large Hadron Collider. The chi(c) and J/psi mesons are identified through their decays chi(c) -> J/psi gamma and J/psi -> mu(+)mu(-) using 36 pb(-1) of data collected by the LHCb detector in 2010. The ratio of the prompt production cross-sections for chi(c) and J/psi, sigma(chi(c) -> J/psi gamma)/sigma(J/psi). is determined as a function of the J/psi, transverse momentum in the range 2 < P-T(J/psi) < 15 GeV/c. The results are in excellent agreement with next-to-leading order non-relativistic expectations and show a significant discrepancy compared with the colour singlet model prediction at leading order, especially in the low P-T(J/psi) region. (C) 2012 CERN. Published by Elsevier B.V. All rights reserved.

AB - The prompt production of charmonium chi(c) and J/psi states is studied in proton-proton collisions at a centre-of-mass energy of root s = 7 TeV at the Large Hadron Collider. The chi(c) and J/psi mesons are identified through their decays chi(c) -> J/psi gamma and J/psi -> mu(+)mu(-) using 36 pb(-1) of data collected by the LHCb detector in 2010. The ratio of the prompt production cross-sections for chi(c) and J/psi, sigma(chi(c) -> J/psi gamma)/sigma(J/psi). is determined as a function of the J/psi, transverse momentum in the range 2 < P-T(J/psi) < 15 GeV/c. The results are in excellent agreement with next-to-leading order non-relativistic expectations and show a significant discrepancy compared with the colour singlet model prediction at leading order, especially in the low P-T(J/psi) region. (C) 2012 CERN. Published by Elsevier B.V. All rights reserved.

U2 - 10.1016/j.physletb.2012.10.068

DO - 10.1016/j.physletb.2012.10.068

M3 - Article

SN - 0370-2693

VL - 718

SP - 431

EP - 440

JO - Physics Letters B

JF - Physics Letters B

IS - 2

ER -

Measurement of the ratio of prompt chi(c) to J/psi production in pp collisions at root s=7 TeV

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