Constraints on the CKM angle α in the B → ρρ decays

被引：0
|
作者：
Li, HB [1 ]
机构：
[1] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA
来源：
INTERNATIONAL JOURNAL OF MODERN PHYSICS A | 2005年 / 20卷 / 15期
关键词：
time-dependent-asymmetry; CKM angle; longitudinal polarization;
D O I：
10.1142/S0217751X05027011
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
Using a data sample of 122 million Upsilon(4S) -> B (B) over bar decays collected with BABAR detector at the PEP-II asymmetric B factory at SLAC, we measure the time-dependent-asymmetry parameters of the longitudinally polarized component in the B-0 rho(+)rho(-)decay as C-L = -0.23 +/- 0.24(stat) +/- 0.14(syst) and S-L = -0.19 +/- 0.33(stat) +/- 0.11(syst). The B-0 -> rho(0)rho(0) decay mode is also searched for in a data sample of about 227 million BR pairs. No significant signal is observed, and an upper limit of 1.1 x 10(-6) (90% C.L.) on the branching fraction is set. The penguin contribution to the CKM angle alpha uncertainty is measured to be 11 degrees. All results are preliminary.
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收藏
页码：3578 / 3580
页数：3
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