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arXiv 0910.2491hep-ex
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在BABAR测量CKM角度α

Measurements of the CKM Angle alpha at BABAR

Simone Stracka

摘要:

我们提出了B 0--> pi+ pi-,B 0--> pi 0 pi 0和B+ --> rho+ rho 0衰变中分支分数和CP不对称性的改进测量,这影响了α的测定。我们发现S(pi+ pi-)= -0.68 +/- 0.10 +/- 0.03 C(pi+ pi-)= -0.25 +/- 0.08 +/- 0.02 C(pi 0 pi 0)= -0.43 +/- 0.26 +/- 0.05 BF(B0 --> pi0 pi0)=(1.83 +/- 0.21 +/- 0.13)x 10^{-6}(B --> pi pi衰变),B -> rho rho衰变的BF(B+ -> rho+ rho 0)=(23.7 +/- 1.4 +/- 1.4)× 10^{-6} f_L(rho+ rho 0)= 0.950 +/- 0.015 +/- 0.006 α(rho rho)=(92.4 + 6.0/-6.5)^{o}。首次测量了B → K_1 π衰变的合并分支分数,并对B_0 → a_1(1260)+ π衰变通道的α进行了新的测定。我们得到BF(B0 --> K_1(1270)+ pi- + K_1(1400)+ pi-)=(3.1 + 0.8/-0.7)x 10^{-5} BF(B+ --> K_1(1270)0 π + + K_1(1400)0 π +)=(2.8 + 2.9/-1.7)x 10^{-5} alpha(a_1π)=(79 +/- 7 +/- 11)^{o}。这些测量是使用在PEP-II B工厂的BaBar探测器收集的最终数据集进行的。

英文摘要:

We present improved measurements of the branching fractions and CP-asymmetries in the B0 --> pi+ pi-, B0 --> pi0 pi0, and B+ --> rho+ rho0 decays, which impact the determination of alpha. We find S(pi+ pi-) = -0.68 +/- 0.10 +/- 0.03 C(pi+ pi-) = -0.25 +/- 0.08 +/- 0.02 C(pi0 pi0) = -0.43 +/- 0.26 +/- 0.05 BF(B0 --> pi0 pi0) = (1.83 +/- 0.21 +/- 0.13) x 10^{-6} for B --> pi pi decays, and BF(B+ --> rho+ rho0) = (23.7 +/- 1.4 +/- 1.4) x 10^{-6} f_L(rho+ rho0) = 0.950 +/- 0.015 +/- 0.006 alpha(rho rho) = (92.4 +6.0/-6.5)^{o} for B --> rho rho decays. The combined branching fractions of B --> K_1 pi decays are measured for the first time and allow a novel determination of alpha in the B0 --> a_1(1260)+ pi- decay channel. We obtain BF(B0 --> K_1(1270)+ pi- + K_1(1400)+ pi-) = (3.1 +0.8/-0.7) x 10^{-5} BF(B+ --> K_1(1270)0 pi+ + K_1(1400)0 pi+) = (2.8 +2.9/-1.7) x 10^{-5} alpha(a_1π) = (79 +/- 7 +/- 11)^{o}. These measurements are performed using the final dataset collected by the BaBar detector at the PEP-II B-factory.

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