Feasibility study of a J/ψ cross section measurement with early CMS data

  • We report the methods and plans for measuring the differential cross section of J/ψ→μ+μ production, using data to be collected in the first LHC run by the CMS detector. Making use of the large B-hadron lifetime, we show how to separate the promptly produced J/ψ's from those coming from B-hadron decays. Since the J/ψ production cross section is expected to be large, the analysis should be viable with relatively small data sets, that will become available early in the startup of the LHC. We also address effects of a non-perfect detector alignment, as well as systematic uncertainties.
    About 70 thousand J/ψ decays are reconstructed from Monte Carlo data, which corresponds to an integrated luminosity of 3 pb-1 in 14 TeV collisions, in the range of ptJ/ψ between 5 and 40 GeV/c. The precision of the result is limited by systematic uncertainties, and is at the 15% level.

  • [1] Evans L, Bryant P (editors). Journal of Instrumentation, 2008, 3: S080012 Chatrchyan S et al. (CMS Collaboration). Journal of Instrumentation, 2008, 3: S080043 Brambilla N et al. CERN Yellow Report, CERN-2005-005 [hep-ph/0412158]4 Lansberg J P. Int. J. Mod. Phys. A, 2006, 21: 3857 [hepph/0602091]5 Kramer M. Prog. Part. Nucl. Phys., 2001, 47: 141 [hepph/0106120]6 Abe F et al. (CDF Collaboration). Phys. Rev. Lett., 1997, 79: 5727 Abe F et al. (CDF Collaboration). Phys. Rev. Lett., 1997, 79: 5788 CDF Collaboration. Phys. Rev. D, 2005, 71: 032001 [hepex/ 0412071]9 CDF Collaboration. Phys. Rev. Lett., 2007, 99: 132001 [arXiv:0704.0638]10 D0 Collaboration. Preliminary Result, Conference Note 5089-CONF, July 200711 Campbell J, Maltoni F, Tramontano F. Phys. Rev. Lett., 2007, 98: 25200212 Artoisenet P, Lansberg J P, Maltoni F. Phys. Lett. B, 2007, 653: 6013 Haberzettl H, Lansberg J P. Phys. Rev. Lett., 2008, 100: 03200614 Lansberg J P, Cudell J R, Kalinovsky Y L. Phys. Lett. B, 2006, 633: 30115 PYTHIA 6.409: Sjostrand T, Mrenna S, Skands P. JHEP, 2006, 0605: 02616 Bargiotti M, Vagnoni V. LHCb-2007-042 17 CMS Collaboration. The Trigger and Data Acquisition Project, Vol. II, CERN/LHCC 2002-02618 CMS Collaboration. CMS Physics: Technical Design Report Volume 1, CERN/LHCC 2006-00119 CDF Collaboration. Journal of Phys. G, 2007, 34: 2457 [hep-ex 0508029]20 BaBar Collaboration. Phys. Rev. D, 2003, 67: 032002 [hepex/0207097]
  • [1] Evans L, Bryant P (editors). Journal of Instrumentation, 2008, 3: S080012 Chatrchyan S et al. (CMS Collaboration). Journal of Instrumentation, 2008, 3: S080043 Brambilla N et al. CERN Yellow Report, CERN-2005-005 [hep-ph/0412158]4 Lansberg J P. Int. J. Mod. Phys. A, 2006, 21: 3857 [hepph/0602091]5 Kramer M. Prog. Part. Nucl. Phys., 2001, 47: 141 [hepph/0106120]6 Abe F et al. (CDF Collaboration). Phys. Rev. Lett., 1997, 79: 5727 Abe F et al. (CDF Collaboration). Phys. Rev. Lett., 1997, 79: 5788 CDF Collaboration. Phys. Rev. D, 2005, 71: 032001 [hepex/ 0412071]9 CDF Collaboration. Phys. Rev. Lett., 2007, 99: 132001 [arXiv:0704.0638]10 D0 Collaboration. Preliminary Result, Conference Note 5089-CONF, July 200711 Campbell J, Maltoni F, Tramontano F. Phys. Rev. Lett., 2007, 98: 25200212 Artoisenet P, Lansberg J P, Maltoni F. Phys. Lett. B, 2007, 653: 6013 Haberzettl H, Lansberg J P. Phys. Rev. Lett., 2008, 100: 03200614 Lansberg J P, Cudell J R, Kalinovsky Y L. Phys. Lett. B, 2006, 633: 30115 PYTHIA 6.409: Sjostrand T, Mrenna S, Skands P. JHEP, 2006, 0605: 02616 Bargiotti M, Vagnoni V. LHCb-2007-042 17 CMS Collaboration. The Trigger and Data Acquisition Project, Vol. II, CERN/LHCC 2002-02618 CMS Collaboration. CMS Physics: Technical Design Report Volume 1, CERN/LHCC 2006-00119 CDF Collaboration. Journal of Phys. G, 2007, 34: 2457 [hep-ex 0508029]20 BaBar Collaboration. Phys. Rev. D, 2003, 67: 032002 [hepex/0207097]
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YANG Zong-Chang and QIAN Si-Jin. Feasibility study of a J/ψ cross section measurement with early CMS data[J]. Chinese Physics C, 2009, 33(8): 609-616. doi: 10.1088/1674-1137/33/8/002
YANG Zong-Chang and QIAN Si-Jin. Feasibility study of a J/ψ cross section measurement with early CMS data[J]. Chinese Physics C, 2009, 33(8): 609-616.  doi: 10.1088/1674-1137/33/8/002 shu
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Received: 2008-11-24
Revised: 2008-12-18
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Feasibility study of a J/ψ cross section measurement with early CMS data

    Corresponding author: QIAN Si-Jin,

Abstract: 

We report the methods and plans for measuring the differential cross section of J/ψ→μ+μ production, using data to be collected in the first LHC run by the CMS detector. Making use of the large B-hadron lifetime, we show how to separate the promptly produced J/ψ's from those coming from B-hadron decays. Since the J/ψ production cross section is expected to be large, the analysis should be viable with relatively small data sets, that will become available early in the startup of the LHC. We also address effects of a non-perfect detector alignment, as well as systematic uncertainties.
About 70 thousand J/ψ decays are reconstructed from Monte Carlo data, which corresponds to an integrated luminosity of 3 pb-1 in 14 TeV collisions, in the range of ptJ/ψ between 5 and 40 GeV/c. The precision of the result is limited by systematic uncertainties, and is at the 15% level.

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