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Chinese Physics C> 2010, Vol. 34> Issue(8) : 1037-1044 DOI: 10.1088/1674-1137/34/8/001

Feasibility study on cross-section measurement of Υ(1S)→μ+μ－ by using early CMS data

  • One of the first physics results that CMS will hopefully obtain will be the analysis of heavy quarkonium productions, including the Υ cross-section measurement. Since the Υ production cross-section from p-p collisions is expected to be relatively large, the analysis should be viable with rather small datasets which will be available soon after the start-up of the LHC. This paper describes the methods and plans for measuring the differential cross-section of Υ (1S)→μ+μ－ production, by using data to be collected from the CMS detector in the first LHC run. In this study, about 80 thousand Υ are reconstructed corresponding to an integrated luminosity of 6.4 pb－1 in 10 TeV proton-proton collisions by using Monte Carlo data. The precision of this measurement is estimated to be about 16%, which is limited by the systematic errors.

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  • References

    [1] . Evans L, Bryant P. Journal of Instrumentation, 2008, 3:S080012. Chatrchyan S et al (CMS collaboration). Journal of Instrumentation, 2008, 3: S080043. Lansberg J P. International Journal of Modern Physics A,2006, 21(1920): 38574. The D0 collaboration. D0 Note 5089-conf5. YANG Z, QIAN S. Chinese Physics C, 2009, 33(8): 6096. https://twiki.cern.ch/twiki/bin/view/CMS/TriggerTables7. CMS collaboration. Physics Technical Design Report Vol.I, Chapter 9. CERN/LHCC 2006-021, 20068. https://twiki.cern.ch/twiki/bin/view/CMS/LumiWikiHome9. CDF collaboration. Phys. Rev. D, 2005, 71: 03200110. CDF collaboration. Phys. Rev. Lett., 2002, 88: 161802

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GUO Shuang, HU Zhen, QIAN Si-Jin, YANG Zong-Chang and LIU Lie. Feasibility study on cross-section measurement of Υ(1S)→μ+μ－ by using early CMS data[J]. Chinese Physics C, 2010, 34(8): 1037-1044. doi: 10.1088/1674-1137/34/8/001
GUO Shuang, HU Zhen, QIAN Si-Jin, YANG Zong-Chang and LIU Lie. Feasibility study on cross-section measurement of Υ(1S)→μ+μ－ by using early CMS data[J]. Chinese Physics C, 2010, 34(8): 1037-1044.  doi: 10.1088/1674-1137/34/8/001 shu
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Received: 2009-10-20
Revised: 2009-11-18
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Feasibility study on cross-section measurement of Υ(1S)→μ+μ－ by using early CMS data

    Corresponding author: QIAN Si-Jin,
  • Received Date: 2009-10-20
  • Accepted Date: 2009-11-18
  • Available Online: 2010-08-05

Abstract: 

One of the first physics results that CMS will hopefully obtain will be the analysis of heavy quarkonium productions, including the Υ cross-section measurement. Since the Υ production cross-section from p-p collisions is expected to be relatively large, the analysis should be viable with rather small datasets which will be available soon after the start-up of the LHC. This paper describes the methods and plans for measuring the differential cross-section of Υ (1S)→μ+μ－ production, by using data to be collected from the CMS detector in the first LHC run. In this study, about 80 thousand Υ are reconstructed corresponding to an integrated luminosity of 6.4 pb－1 in 10 TeV proton-proton collisions by using Monte Carlo data. The precision of this measurement is estimated to be about 16%, which is limited by the systematic errors.

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