New ways to search for right-handed current in B→ρℓ$ar{ν}$ decay
New ways to search for right-handed current in B→ρℓ$ar{ν}$ decay
复制标题
在 B→ρℓ$ar{ν}$ 衰减中搜索右手电流的新方法
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
S. Turczyk
中科院分区：
文献类型：
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作者：
F. Bernlochner;Z. Ligeti;S. Turczyk
缓解|V_{ub}|不同测定之间的紧张关系的一种有趣的可能性是允许右手对标准模型弱电流的一小部分贡献。目前对这样一种贡献的限制相当薄弱。我们提出了在半轻子B>；Rho ell nu衰变中寻找这种超标准模型贡献的新方法。引入了一个、两个或三个角度变量的广义不对称性作为判别器，它不需要对全微分分布进行非二进制分析，并对相应的理论不确定性进行了详细的研究。下面讨论入库测量如何获取所有角度信息，这在B-&>Rho ell nu和B->；K^*ell^+ell^-中都是有用的，并且可能在前一次由于背景而导致的衰变中是必不可少的。从可用的Babar和Belle数据集以及预期的50 ab^{-1}Belle II数据中探索了可实现的灵敏度。
An interesting possibility to ease the tension between various determinations of |V_{ub}| is to allow a small right-handed contribution to the standard model weak current. The present bounds on such a contribution are fairly weak. We propose new ways to search for such a beyond standard model contribution in semileptonic B -> rho ell nu decay. Generalized asymmetries in one, two, or three angular variables are introduced as discriminators, which do not require an unbinned analysis of the fully differential distribution, and a detailed study of the corresponding theoretical uncertainties is performed. A discussion on how binned measurements can access all the angular information follows, which may be useful in both B -> rho ell nu and B -> K^* ell^+ ell^-, and possibly essential in the former decay due to backgrounds. The achievable sensitivity from the available BaBar and Belle data sets is explored, as well as from the anticipated 50 ab^{-1} Belle II data.