Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands.
Phys Rev Lett. 2012 Mar 16;108(11):111602. doi: 10.1103/PhysRevLett.108.111602. Epub 2012 Mar 12.
A search for time-integrated CP violation in D(0)→h(-)h(+) (h=K, π) decays is presented using 0.62 fb(-1) of data collected by LHCb in 2011. The flavor of the charm meson is determined by the charge of the slow pion in the D(+)→D(0)π(+) and D(-)→Dover ¯π(-) decay chains. The difference in CP asymmetry between D(0)→K(-)K(+) and D(0)→π(-)π(+), ΔA(CP)≡A(CP)(K(-)K(+))-A(CP)(π(-)π(+)), is measured to be [-0.82±0.21(stat)±0.11(syst)]%. This differs from the hypothesis of CP conservation by 3.5 standard deviations.
使用 LHCb 在 2011 年收集的 0.62 fb(-1)的数据，对 D(0)→h(-)h(+) (h=K, π)衰变中的时间积分 CP 破坏进行了搜索。通过 D(+)→D(0)π(+) 和 D(-)→Dover ¯π(-)衰变链中慢介子的电荷确定了魅子介子的味道。D(0)→K(-)K(+)和 D(0)→π(-)π(+)之间的 CP 不对称性差异，ΔA(CP)≡A(CP)(K(-)K(+))-A(CP)(π(-)π(+))，被测量为[-0.82±0.21(stat)±0.11(syst)]%。这与 CP 守恒的假设相差 3.5 个标准差。
