J/ψ→μ<SUP>+</SUP>μ<SUP>－</SUP> reconstruction in the CMS experiment

YANG Zong-Chang; QIAN Si-Jin

doi:10.1088/1674-1137/33/3/001

Chinese Physics C> 2009, Vol. 33> Issue(3) : 161-169 DOI: 10.1088/1674-1137/33/3/001

J/ψ→μ⁺μ^－ reconstruction in the CMS experiment

YANG Zong-Chang ,
QIAN Si-Jin ^,

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Abstract：
In this paper the J/ψ→μ⁺μ^－ reconstruction performance in the CMS experiment at the LHC is studied in detail by using B_s→J/ψ φ→μμKK events. The reconstruction efficiencies of J/ψ mesons and their decay muons are obtained as a function of the transverse momentum p_T and the pseudo-rapidity η. We also study the muon trigger efficiency for this channel with the planned Level-1 trigger and High Level Trigger selection criteria. It was observed that the muon reconstruction efficiency decreases when the two decay muons have a small or large 3D angular separation, which further affects the overall J/ψ reconstruction efficiency.

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YANG Zong-Chang and QIAN Si-Jin. J/ψ→μ⁺μ^－ reconstruction in the CMS experiment[J]. Chinese Physics C, 2009, 33(3): 161-169. doi: 10.1088/1674-1137/33/3/001

YANG Zong-Chang and QIAN Si-Jin. J/ψ→μ⁺μ^－ reconstruction in the CMS experiment[J]. Chinese Physics C, 2009, 33(3): 161-169. doi: 10.1088/1674-1137/33/3/001 shu

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Received: 2008-08-06
Revised: 2008-08-30

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沈阳化工大学材料科学与工程学院沈阳 110142

J/ψ→μ⁺μ^－ reconstruction in the CMS experiment

YANG Zong-Chang
QIAN Si-Jin ^,

Corresponding author: QIAN Si-Jin,

Received Date: 2008-08-06
Accepted Date: 2008-08-30
Available Online: 2009-03-05

Abstract:

In this paper the J/ψ→μ⁺μ^－ reconstruction performance in the CMS experiment at the LHC is studied in detail by using B_s→J/ψ φ→μμKK events. The reconstruction efficiencies of J/ψ mesons and their decay muons are obtained as a function of the transverse momentum p_T and the pseudo-rapidity η. We also study the muon trigger efficiency for this channel with the planned Level-1 trigger and High Level Trigger selection criteria. It was observed that the muon reconstruction efficiency decreases when the two decay muons have a small or large 3D angular separation, which further affects the overall J/ψ reconstruction efficiency.