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arXiv 1105.2296hep-ph
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超对称性中的U(2)和最小味破坏

U(2) and Minimal Flavour Violation in Supersymmetry

Riccardo Barbieri, Gino Isidori, Joel Jones-Perez, Paolo Lodone, David M. Straub

摘要:

而不是坚持完整的$U(3)^3$近似对称性通常调用最小味违反,我们分析了一个适当的破$U(2)^3$对称性作用于前两代夸克和方的当前味数据的后果。$ΔF=2$波幅$\cM(K^0 \to \bar K^0)$、$\cM(B_d \to \bar B_d)$和$\cM(B_s \to \bar B_s)$之间存在一定的相关性,可以分辨出$\cM(K^0 \to \bar K^0)$和$\cM(B_d \to \bar B_d)$之间的电流张力,同时预测$\cM(B_s \to \bar B_s)$。特别地,在$B_s \to ψϕ$中的CP违反不对称性被预测为正的并且高于其标准模型值($0.05 \lsim S_{ψϕ} \lsim 0.2$)。对于胶子和左手sbottom质量来说,最好的区域是低于大约$1÷1.5$ TeV。给出了实现图中$U(2)^3$的动力学模型的存在性证明。

英文摘要:

Rather than sticking to the full $U(3)^3$ approximate symmetry normally invoked in Minimal Flavour Violation, we analyze the consequences on the current flavour data of a suitably broken $U(2)^3$ symmetry acting on the first two generations of quarks and squarks. A definite correlation emerges between the $ΔF=2$ amplitudes $\cM(K^0 \to \bar K^0)$, $\cM(B_d \to \bar B_d)$ and $\cM(B_s \to \bar B_s)$, which can resolve the current tension between between $\cM(K^0 \to \bar K^0)$ and $\cM(B_d \to \bar B_d)$, while predicting $\cM(B_s \to \bar B_s)$. In particular, the CP violating asymmetry in $B_s \to ψϕ$ is predicted to be positive and above its Standard Model value ($0.05 \lsim S_{ψϕ} \lsim 0.2$). The preferred region for the gluino and the left-handed sbottom masses is below about $1÷1.5$ TeV. An existence proof of a dynamical model realizing the $U(2)^3$ pictured is outlined.

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