测量 Ds±→ϕπ±衰变中的直接 CP 破坏电荷不对称性。
Measurement of the direct CP-violating charge asymmetry in Ds ± → ϕ π ± decays.
机构信息
Joint Institute for Nuclear Research, Dubna, Russia.
University of Oklahoma, Norman, Oklahoma 73019, USA.
出版信息
Phys Rev Lett. 2014 Mar 21;112(11):111804. doi: 10.1103/PhysRevLett.112.111804.
We present a measurement of the direct CP-violating charge asymmetry in Ds+ → ϕ π(±) decays where the ϕ meson decays to K(+)K(-), using the full Run II data set with an integrated luminosity of 10.4 fb-1 of proton-antiproton collisions collected using the D0 detector at the Fermilab Tevatron Collider. The normalized difference A(CP) in the yield of D(s)(+) and D(s)(-) mesons in these decays is measured by fitting the difference between their reconstructed invariant mass distributions. This results in an asymmetry of A(CP) = [-0.38 ± 0.27]%, which is the most precise measurement of this quantity to date. The result is consistent with the standard model prediction of zero CP asymmetry in this decay.
我们呈现了一个在 Ds+→ϕπ(±)衰变中直接 CP 破坏电荷不对称性的测量结果，其中 ϕ 介子衰变为 K(+)K(-)，使用了在费米实验室 Tevatron 对撞机上运行的 D0 探测器收集的 10.4 fb-1 质子-反质子碰撞的完整二期数据。通过拟合它们重建的不变质量分布之间的差异，测量了这些衰变中 D(s)(+)和 D(s)(-)介子的产额的归一化差异 A(CP)。这导致不对称性 A(CP)=[-0.38±0.27]%，这是迄今为止对该量最精确的测量。结果与该衰变中 CP 不对称性为零的标准模型预测一致。
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