论文标题
魅力腐烂
Charm decays
论文作者
论文摘要
我讨论了$ d $介子的HADRONIC衰变，重点是最近发现$ d^0 \ to k^+k^ - ，π^+π^ - $衰减的魅力CP违规。测得的差异$ΔA_{cp} \，\ equiv \; a_ {cp}^{\ mathrm {dir}}（d^0 \ rightarrow k^+k^ - ） （-15.4 \ pm 2.9）\ CDOT 10^{ - 4} $两个直接CP不对称的$超过SM的预测。可能的解释是增强企鹅振幅输入$ a_ a_ a_ {cp}^{cp}^{cp}^{\ nathrm {dir dir}} $ by qccd的效果的增强。另外，$ΔA_{CP} $可以由新物理学的贡献主导。为了区分这两个假设，应测量进一步的CP不对称性。到此为止，由两个树级振幅的干扰产生的cp不对称，将auch作为$ a_ {cp}^{\ mathrm {dir}}（d^0 \ rightarrow k_sk_s）$或$ a_ {cp} 有趣的。
I discuss hadronic decays of $D$ mesons with emphasis on the recent discovery of charm CP violation in $D^0\to K^+K^-,π^+π^-$ decays. The measured difference $Δa_{CP} \, \equiv \; a_{CP}^{\mathrm{dir}}(D^0\rightarrow K^+K^-) - a_{CP}^{\mathrm{dir}}(D^0\rightarrowπ^+π^-) = \; (-15.4\pm 2.9)\cdot 10^{-4}$ of two direct CP asymmetries exceeds the SM prediction by a factor of 7. A possible explanation is an enhancement of the penguin amplitude entering $ a_{CP}^{\mathrm{dir}}$ by QCD effects which are not understood yet. Alternatively, $Δa_{CP}$ could be dominated by contributions from new physics. In order to distinguish these two hypotheses further CP asymmetries should be measured. To this end CP asymmetries resulting from the interference of two tree-level amplitudes auch as $a_{CP}^{\mathrm{dir}}(D^0\rightarrow K_SK_S)$ or $a_{CP}^{\mathrm{dir}}(D^0 \to K^{*0} K_S)$ are especially interesting.
