Measurement of the CP-violating phase ? s and the B s 0 meson decay width difference with B s 0 ? J/?? decays in ATLAS
Measurement of the CP-violating phase ? s and the B s 0 meson decay width difference with B s 0 ? J/?? decays in ATLAS
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CP 破坏相的测量 ?
DOI：
10.1007/jhep08(2016)147
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发表时间：
2016
影响因子：
5.4
通讯作者：
Aad G
中科院分区：
文献类型：
--
作者：
Aad G
本文介绍了利用ATLAS探测器收集的8 TeVpp碰撞的14.3fb ~（-1）积分光度测量B_0 ~ s → J/J ~（-1）通道中B_0 ~ s衰变参数的方法。测量的参数包括CP破坏相位τ s、衰变宽度τ s和质量本征态宽度差Δ τ s。物理参数的测量值与7 TeV的4.9fb ~（-1）的测量值进行统计组合，得到Φs= -0.090 ± 0.078（stat.）±（系统）rad ΔΓs= 0.085 ± 0.011（静态）± 0.007（系统）ps-1Γs= 0.675 ± 0.003（静态）± 0.03（系统）ps ~（-1）在分析中，参数Δ r被约束为正值。在ε s-Δ r平面中，ε s和Δ r萨雷的结果也显示为68%和95%的似然等高线。在这个衰变通道中还测量了横向振幅和相应的强相位。所有的测量结果都与标准模型的预测一致。
A measurement of the B0sdecay parameters in the B0s→ J/ψϕ channel using an integrated luminosity of 14.3 fb-1collected by the ATLAS detector from 8 TeV pp collisions at the LHC is presented. The measured parameters include the CP-violating phase ϕs, the decay width Γsand the width difference between the mass eigenstates ΔΓs. The values measured for the physical parameters are statistically combined with those from 4.9 fb-1of 7 TeV data, leading to the following: Φs= -0.090 ± 0.078 (stat.) ± (syst.) rad ΔΓs= 0.085 ± 0.011 (stat.) ± 0.007 (syst.) ps-1Γs= 0.675 ± 0.003 (stat.) ± 0.03 (syst.) ps-1In the analysis the parameter ΔΓsis constrained to be positive. Results for ϕsand ΔΓsare also presented as 68% and 95% likelihood contours in the ϕs-ΔΓsplane. Also measured in this decay channel are the transversity amplitudes and corresponding strong phases. All measurements are in agreement with the Standard Model predictions.