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Helicity selection rules and noninterference for BSM amplitudes

机译:BSM振幅的螺旋选择规则和不干扰

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Precision studies of scattering processes at colliders provide powerful indirect constraints on new physics. We study the helicity structure of scattering amplitudes in the standard model (SM) and in the context of an effective Lagrangian description of beyond-the-SM (BSM) dynamics. Our analysis reveals a novel set of helicity selection rules according to which, in the majority of 2 → 2 scattering processes at high energy, the SM and the leading BSM effects do not interfere. In such situations, the naive expectation that dimension-6 operators represent the leading BSM contribution is compromised, as corrections from dimension-8 operators can become equally (if not more) important well within the validity of the effective field theory approach.
机译:对撞机散射过程的精确研究为新物理学提供了强大的间接约束。我们研究了标准模型(SM)中散射振幅的螺旋结构,并在有效的拉格朗日描述中描述了超越SM(BSM)动力学的情况。我们的分析揭示了一套新颖的螺旋选择规则,根据该规则,在高能下的2→2散射过程中,SM和主要的BSM效应不会相互干扰。在这种情况下,因为在有效场论方法的有效性范围内,来自8维运算符的更正变得同等重要(即使不是更多),对6维运算符代表BSM领先贡献的天真期望也受到了损害。

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