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arXiv 0705.0308hep-ph
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$ K_L^0 \to e^{\mp} μ^{\pm}, B^0 \to e^{\mp} τ^{\pm} $衰变中标量和规范轻夸克的质量极限

Mass limits for scalar and gauge leptoquarks from $ K_L^0 \to e^{\mp} μ^{\pm}, B^0 \to e^{\mp} τ^{\pm} $ decays

A. D. Smirnov

备注：
9 pages, 2 figures. To be published in Mod. Phys. Lett. A
发表信息：
Mod.Phys.Lett.A22:2353-2363,2007
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摘要：

在类矢量四色对称和手征四色对称模型中，用夸克-轻子质量分裂的Higgs机制计算了标量和规范轻夸克对$K^0_L \to e^{\mp} μ^{\pm}$，$B^0 \to e^{\mp} τ^{\pm}$衰变宽度的贡献.根据$K^0_L$和$B^0$衰变的现有数据，得到了标量和手征轻夸克的质量极限以及更新的矢量轻夸克质量极限。结果表明，与规范轻夸克不同，标量轻夸克的质量极限是弱的，量级或低于它们的直接质量极限。在大型强子对撞机上寻找这样的标量轻夸克和进一步寻找轻子衰变$ B^0 \to l^+_i l^-_j $是令人感兴趣的。

英文摘要：

The contributions of scalar and gauge leptoquarks into widths of $K^0_L \to e^{\mp} μ^{\pm}$, $B^0 \to e^{\mp} τ^{\pm}$ decays are calculated in the models with the vectorlike and chiral four color symmetry and with the Higgs mechanism of the quark-lepton mass splitting. From the current data on $K^0_L$ and $B^0$ decays the mass limits for scalar and chiral leptoquarks and the updated vector leptoquark mass limits are obtained. It is shown that unlike the gauge leptoquarks the scalar leptoquark mass limits are weak, of order or below their direct mass limits. The search for such scalar leptoquarks at LHC and the further search for leptonic decays $ B^0 \to l^+_i l^-_j $ are of interest.

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