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arXiv 1407.7374hep-phhep-ex
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单Cabibbo抑制D衰变的新物理

New physics in singly Cabibbo-suppressed D decays

Mchael Gronau

摘要:

最近导出了$D^0 \to π^+K^-$、$K^+π^-$、$K^+K^-, π^+π^-$四个振幅比之间的U自旋关系,包括一阶、二阶和三阶U自旋破缺,其精度为$10^{-3}$。我们研究了新的$|ΔC|=1$算子对这种关系的影响。我们发现它不受U自旋标量算符的影响,包括QCD企鹅算符和色磁偶极算符。用新的$U=1$算符修正了该关系,使其对二阶U自旋破缺的灵敏度仅为百分之几。将这种关系与$D^0\to K^+K^-, π^+π^-$中的CP不对称性相结合,会导致对$U=1$算子的约束比单独的不对称性更可靠。

英文摘要:

A U-spin relation among four ratios of amplitudes for $D^0 \to π^+K^-$, $K^+π^-$, $K^+K^-, π^+π^-$, including first, second and third order U-spin breaking, has been derived recently with a precision of $10^{-3}$. We study effects of new $|ΔC|=1$ operators on this relation. We find that it is not affected by U-spin scalar operators, including QCD penguin and chromomagnetic dipole operators occurring in supersymmetric and extra-dimensional models. The relation is modified by new $U=1$ operators with a sensitivity of a few percent characteristic of second order U-spin breaking. Combining this relation with CP asymmetries in $D^0\to K^+K^-, π^+π^-$ leads to a more solid constraint on $U=1$ operators than from asymmetries alone.

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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