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arXiv 1804.09006hep-phhep-exhep-lat
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宇称加倍作为右手电流双稳的工具

Parity Doubling as a Tool for Right-handed Current Searches

James Gratrex, Roman Zwicky

摘要:

弱相互作用的V-A结构导致$b \to (d,s)γ$和$b \to (d,s) \ell \bar{\ell}$介导的重-轻排斥衰变中确定的振幅等级。然而,右手电流的提取超出了标准模型被泄漏到右手振幅的V-A长距离贡献所污染。我们建议,这些量子数变化的长距离的贡献,可以通过考虑几乎宇称简并矢量介子的最终状态,利用相反的相对符号的左,右手振幅控制。例如,测量$B \to (V,A) γ$中一对矢量$V(J^P=1^-)$和轴向$A(1^+)$介子的含时速率,在理论不确定度预测的基础上,得到了高达一个数量级的增益,并受长距离与右手振幅之比的控制。这使得这些衰减干净的探针,从理论方面为空测试。

英文摘要:

The V-A structure of the weak interactions leads to definite amplitude hierarchies in exclusive heavy-to-light decays mediated by $b \to (d,s)γ$ and $b \to (d,s) \ell \bar{\ell}$. However, the extraction of right-handed currents beyond the Standard Model is contaminated by V-A long-distance contributions leaking into right-handed amplitudes. We propose that these quantum-number changing long-distance contributions can be controlled by considering the almost parity-degenerate vector meson final states by exploiting the opposite relative sign of left- versus right-handed amplitudes. For example, measuring the time-dependent rates of a pair of vector $V(J^P=1^-)$ and axial $A(1^+)$ mesons in $B \to (V,A) γ$, up to an order of magnitude is gained on the theory uncertainty prediction, controlled by long-distance ratios to the right-handed amplitude. This renders these decays clean probes to null tests, from the theory side.

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