Tests of Anomalous Higgs Boson Couplings through $e^-e^+ \to HZ$ and $Hγ$

Details Tests of Anomalous Higgs Boson Couplings through $e^-e^+ \to HZ$ and $Hγ$ Tests of Anomalous Higgs Boson Couplings through $e^-e^+ \to HZ$ and $Hγ$

1995-09-18

arxiv.org/abs/hep-ph/9509316v2

Nucl.Phys. B459 (1996) 51-74

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages + 9 figures in .uu files. revised version (corrected scales). (e-mail renard@lpmsun2.lpm.univ-montp2.fr)

Scientific paper

10.1016/0550-3213(95)00602-8

We show how the processes $e^- e^+ \to ZH, ~ \gamma H$, which will be studied at LEP2 and at high energy colliders, could be used to search for types of New Physics (NP) characterized by an effective NP scale in the few TeV range and affecting the scalar sector only. In particular, for $e^- e^+ \to Z H$, we propose the measurement of suitable azimuthal asymmetries determined from the angular distribution of the $Z$-decay plane with respect to the $Z$-production one. Such asymmetries, together with the $ZH$ angular distribution, may allow a complete disentangling of the five $dim=6$ operators $ {\cal O }_{UB}$, $ {\cal O }_{UW}$, $\overline{{\cal O }}_{UB}$, $\overline{{\cal O }}_{UW}$, ${\cal O }_{\Phi2}$, describing the residual NP effects to the Higgs couplings. We note that the first four of these operators contribute to processes relevant to LEP1 precision measurements only at the 1-loop level, while the last operator remains completely unconstrained at this level. The process $e^- e^+ \to \gamma H$ is also very sensitive to NP and should bring important independent information.

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