Leptoquark on P→ℓ+ν, FCNC and LFV
作者： Rachid Benbrik , Chuan-Hung Chen
DOI: 10.1016/J.PHYSLETB.2009.01.011
关键词:
摘要: Abstract Motivated by the disagreement between experimental data and lattice calculations on decay constant of D s meson, we investigate leptoquark (LQ) contributions to purely leptonic decays a pseudoscalar (P). We concentrate LQs which only couple second-generation quarks before electroweak symmetry breaking discuss in detail how flavor effects are brought into extension Standard Model after spontaneous breaking. show that assumption hermiticity for fermion mass matrices cannot reproduce correct Cabibbo–Kobayashi–Maskawa Maki–Nakagawa–Sakata matrices, but also reduce number independent mixing lead V f R = L with ( ) denoting chirality f-type fermion. Accordingly, it is found , d → l + ν B τ c have strong correlation parameters. predict meson calculated could be less than 23%. Intriguingly, resultant upper limits branching ratios μ − π 0 η ′ ρ ω around 5.1 × 10 −7 2.6 1.5 0.6 7.4 4.8 −8 below close current bounds, respectively.
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