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

YANG Zong-Chang; QIAN Si-Jin

doi:10.1088/1674-1137/33/8/002

Chinese Physics C> 2009, Vol. 33> Issue(8) : 609-616 DOI: 10.1088/1674-1137/33/8/002

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

YANG Zong-Chang ,
QIAN Si-Jin ^,

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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 p_t^J/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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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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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

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

Corresponding author: QIAN Si-Jin,

Received Date: 2008-11-24

Accepted Date: 2008-12-18

Available Online: 2009-08-05

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

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