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arXiv 1802.04867hep-ex
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在PDMATHAAC 7和8 TeV的pp碰撞中$Λ_b\to J/ψ\, Λ$衰变的$Λ_b$极化和角参数的测量

Measurement of the $Λ_b$ polarization and angular parameters in $Λ_b\to J/ψ\, Λ$ decays from pp collisions at $\sqrt{s}=$ 7 and 8 TeV

CMS Collaboration

摘要:

对衰变$Λ_b \to J/ψ(\toμ^+μ^-)Λ(\to p π^-)$衰变进行分析,以测量LHC CMS实验收集的$\sqrt{s} =$ 7和8 TeV pp碰撞数据中的$Λ_b \to J/ψ(\toμ^+μ^-)Λ(\to p π^-)$极化和三个角度参数。测量$Λ_b$极化为0.00 $\pm$ 0.06(stat)$\pm$ 0.06(syst),并且确定奇偶违反不对称参数为0.14 $\pm$ 0.14(stat)$\pm$ 0.10(syst)。的测量进行比较,各种理论预测,包括那些从微扰量子色动力学。

英文摘要:

An analysis of the decay $Λ_b \to J/ψ(\toμ^+μ^-)Λ(\to p π^-)$ decay is performed to measure the $Λ_b$ polarization and three angular parameters in data from pp collisions at $\sqrt{s} =$ 7 and 8 TeV, collected by the CMS experiment at the LHC. The $Λ_b$ polarization is measured to be 0.00 $\pm$ 0.06 (stat) $\pm$ 0.06 (syst) and the parity-violating asymmetry parameter is determined to be 0.14 $\pm$ 0.14 (stat) $\pm$ 0.10 (syst). The measurements are compared to various theoretical predictions, including those from perturbative quantum chromodynamics.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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