论文标题
异常耦合的单位性约束
Unitarity Constraints on Anomalous Quartic Couplings
论文作者
论文摘要
我们在最低维度有效的操作员上获得了部分波浪的限制，该操作员会产生异常的四分音量规耦合，但使三量规耦合不受影响。我们考虑使用电动对称性的线性和非线性实现的操作员扩展，并探索相关操作员系数的多维参数空间：20位线性扩展中的dimension-eight运算符，5 $ {\ cal O}（p^4）（p^4）$在衍生性扩展中的操作员。我们研究了所有耦合通道和所有可能的螺旋性振幅的电动仪表玻色子和希格斯玻色子的两到两个散射，$ j = 0,1 $ partial波。通常，当几个操作员系数同时考虑到不变时，界限会因少数因素而降低。但是，这需要考虑一些$ j = 0 $和$ j = 1 $ partial Wave的约束，对于某些运营商。
We obtain the partial-wave unitarity constraints on the lowest-dimension effective operators which generate anomalous quartic gauge couplings but leave the triple gauge couplings unaffected. We consider operator expansions with linear and nonlinear realizations of the electroweak symmetry and explore the multidimensional parameter space of the coefficients of the relevant operators: 20 dimension-eight operators in the linear expansion and 5 ${\cal O}(p^4)$ operators in the derivative expansion. We study two-to-two scattering of electroweak gauge bosons and Higgs bosons taking into account all coupled channels and all possible helicity amplitudes for the $J=0,1$ partial waves. In general, the bounds degrade by factors of a few when several operator coefficients are considered non-vanishing simultaneously. However, this requires to consider constraints from both $J=0$ and $J=1$ partial waves for some sets of operators.
