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Evidence for isospin violation and measurement of $$CP$$ asymmetries in $$B to K^{ast}(892)gamma$$

$$B to K^{ast}(892) gamma$$におけるアイソスピンの破れの証拠と$$CP$$非対称性の測定

堀口 朋裕*; 谷田 聖   ; Belle Collaboration*; 他191名*

Horiguchi, Tomohiro*; Tanida, Kiyoshi; Belle Collaboration*; 191 of others*

We report the first evidence for isospin violation in $$B to K^{ast}(892) gamma$$ and the first measurement of the difference of $$CP$$ asymmetries between $$B^+ to K^{ast+} gamma$$ and $$B^0 to K^{ast0} gamma$$. This analysis is based on the data sample containing $$772times10^6$$ $$Bbar{B}$$ pairs that was collected with the Belle detector at the KEKB energy-asymmetric $$e^+e^-$$ collider. We find evidence for the isospin violation with a significance of $$3.1sigma$$, $$Delta_{0+}=[+6.2 pm 1.5 ({rm stat}) pm 0.6 ({rm syst}) pm 1.2(f_{+-}/f_{00})]%$$, where the third uncertainty is due to the uncertainty on the fraction of $$B^+B^-$$ to $$B^0bar{B}^0$$ production in $$Upsilon(4S)$$ decays. The measured value is consistent with predictions of the standard model. The result for the difference of $$CP$$ asymmetries is $$Delta A_{CP}=[+2.4 pm 2.8 ({rm stat}) pm 0.5 ({rm syst})]%$$, consistent with zero. The measured branching fractions and $$CP$$ asymmetries for charged and neutral $$B$$ meson decays are the most precise to date. We also calculate the ratio of branching fractions of $$B^0 to K^{ast0} gamma$$ to $$B_s^0 to phi gamma$$.

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パーセンタイル:74.18

分野:Physics, Multidisciplinary

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