CP mixed property of the Higgs-like particle in the decay channel $h\to Z{Z}^{\ast }\to 4l$

Abstract

Current experiments do not support, as ATLAS and CMS collaborations at the Large Hadron Collider reported, that the Higgs-like resonance discovered in July 2012 is a pure CP-odd state. We examine a general $hZZ$ vertex which contains CP-even and CP-odd couplings, by studying the process $h\to Z{Z}^{\ast }\to l_1^{+}{l}_1^{-}{l}_2^{+}{l}_2^{-}$ with $l_1,l_2=e$ or $\mu$, to explore the CP mixed property of the Higgs-like particle. One momentum asymmetry and two angular asymmetries have been analyzed in order to reveal the difference from different CP-couplings. Our study shows that these asymmetries could be interesting observables in the future precise experiments.

Comments: 13 pages, 6 figures, references and some discussion added