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Laboratoire de Physique des Particules, IN2P3/CNRS et Université de Savoie, F-74941 Annecy-Le-Vieux, France.
Phys Rev Lett. 2007 May 4;98(18):181803. doi: 10.1103/PhysRevLett.98.181803. Epub 2007 May 2.
We present measurements of CP-violating asymmetries in the decay B(0)-->a(1)(+/-)(1260)pi(-/+) with a(1)(+/-)(1260)-->pi(-/+)pi(+/-)pi(+/-). The data sample corresponds to 384x10(6) BB[over ] pairs collected with the BABAR detector at the PEP-II asymmetric B factory at SLAC. We measure the CP-violating asymmetry A(CP)(a(1)pi)=-0.07+/-0.07+/-0.02, the mixing-induced CP violation parameter S(a(1)pi)=0.37+/-0.21+/-0.07, the direct CP violation parameter C(a(1)pi)=-0.10+/-0.15+/-0.09, and the parameters DeltaC(a(1)pi)=0.26+/-0.15+/-0.07 and DeltaS(a(1)pi)=-0.14+/-0.21+/-0.06. From these measured quantities we determine the angle alpha(eff)=78.6 degrees +/-7.3 degrees.
我们给出了在衰变(B^0\to a_1^{(\pm)}(1260)\pi^{(\mp)})（其中(a_1^{(\pm)}(1260)\to\pi^{(\mp)}\pi^{(\pm)}\pi^{(\pm)})）中CP破坏不对称性的测量结果。数据样本对应于在SLAC的PEP-II非对称B工厂用BABAR探测器收集的(384\times10^6)对(B\overline{B})。我们测量了CP破坏不对称性(A_{CP}(a_1\pi)= -0.07\pm0.07\pm0.02)，混合诱导的CP破坏参数(S(a_1\pi)= 0.37\pm0.21\pm0.07)，直接CP破坏参数(C(a_1\pi)= -0.10\pm0.15\pm0.09)，以及参数(\Delta C(a_1\pi)= 0.26\pm0.15\pm0.07)和(\Delta S(a_1\pi)= -0.14\pm0.21\pm0.06)。从这些测量量中我们确定有效角(\alpha_{eff}= 78.6^{\circ}\pm7.3^{\circ})。
