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arXiv 1407.7044hep-ph
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$SU(2)\times U(1)$规范不变性和稀有$B$衰变中新物理的形状

$SU(2)\times U(1)$ gauge invariance and the shape of new physics in rare $B$ decays

Rodrigo Alonso, Benjamin Grinstein, Jorge Martin Camalich

摘要:

$B$衰变中的新物理效应通常通过在强和电磁规范对称性下不变的算子来模拟。假设新物理学的标度远高于电弱标度,我们进一步要求在完全标准模型规范对称性群下的不变性。保留高达6维运营商,我们揭示了新的约束不同的新物理运营商,假设是独立的标准唯象分析。我们通过分析罕见的$B_{q}$(半)轻子衰变对新物理的约束来说明这种方法。

英文摘要:

New physics effects in $B$ decays are routinely modeled through operators invariant under the strong and electromagnetic gauge symmetries. Assuming the scale for new physics is well above the electro-weak scale, we further require invariance under the full Standard-Model gauge symmetry group. Retaining up to dimension-6 operators, we unveil new constraints between different new-physics operators that are assumed to be independent in the standard phenomenological analyses. We illustrate this approach by analyzing the constraints on new physics from rare $B_{q}$ (semi-)leptonic decays.

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