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arXiv 1207.4495hep-phhep-ex
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b -> s跃迁中的新物理和B_{d,s} ^0 -> V_1 V_2角分析

New Physics in b -> s Transitions and the B_{d,s}^0 -> V_1 V_2 Angular Analysis

Alakabha Datta, Murugeswaran Duraisamy, David London

摘要:

我们假设在b → s跃迁中存在新物理(NP),并考察了它对B_q^0 → V_1V_2(q=d,s)角分布的影响,其中V_{1,2}为矢量介子.我们发现,在这样的NP的存在下,公式有关的参数的未标记的,时间积分的角分布到某些可观的(极化分数,CP违反三重产品不对称性,CP保守的干扰项)必须从他们的标准模型形式进行修改。这种变化部分是由于B^0_q-Bbar^0_q的宽度差不为零,这只对B^0_s衰变有意义。我们重新分析B^0_s -> phi phi数据以查看这些修改的效果。当(Delta Gamma_s/2)/Gamma_s ~ 10%时,导出的观测量变化率为O(10%)。这些都不是很大,但可能是重要的,因为人们正在寻找NP的信号。此外,如果NP对b -> s衰变有贡献,则未标记的时间相关角分布的测量提供了足够的信息来提取所有NP参数。

英文摘要:

We suppose that there is new physics (NP) in b -> s transitions, and examine its effect on the angular distribution of B_q^0 -> V_1 V_2 (q=d,s), where V_{1,2} are vector mesons. We find that, in the presence of such NP, the formulae relating the parameters of the untagged, time-integrated angular distribution to certain observables (polarization fractions, CP-violating triple-product asymmetries, CP-conserving interference term) must be modified from their standard-model forms. This modification is due in part to a nonzero B^0_q-Bbar^0_q width difference, which is significant only for B^0_s decays. We re-analyze the B^0_s -> phi phi data to see the effect of these modifications. As (Delta Gamma_s/2)/Gamma_s ~ 10%, there are O(10%) changes in the derived observables. These are not large, but may be important given that one is looking for signals of NP. In addition, if the NP contributes to the b -> s decay, the measurement of the untagged time-dependent angular distribution provides enough information to extract all the NP parameters.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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