2022 Impact factor 4.4
Particles and Fields
Eur. Phys. J. C 14, 457-468
DOI 10.1007/s100520000366

Prospects of measuring general Higgs couplings
at e+e- linear colliders

K. Hagiwara1 - S. Ishihara1,2 - J. Kamoshita3 - B.A. Kniehl4

1 Theory Group, KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
2 Department of Physics, Hyogo University of Education, 941-1 Shimokume, Yashiro, Kato, Hyogo 673-1494, Japan
3 Department of Physics, Ochanomizu University, 2-1-1 Otsuka, Bunkyo, Tokyo 112-8610, Japan
4 II. Institut für Theoretische Physik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany

Received: 4 February 2000 / Published online: 6 April 2000 - © Springer-Verlag 2000

We examine how accurately the general HZV couplings, with $V=Z,\gamma$, may be determined by studying $e^+e^-\to Hf\bar{f}$ processes at future e+e-linear colliders. By using the optimal-observable method, which makes use of all available experimental information, we find out which combinations of the various HZVcoupling terms may be constrained most efficiently with high luminosity. We also assess the benefits of measuring the tau-lepton helicities, identifying the bottom-hadron charges, polarizing the electron beam and running at two different collider energies. The HZZ couplings are generally found to be well constrained, even without these options, while the $HZ\gamma$ couplings are not. The constraints on the latter may be significantly improved by beam polarization.

Copyright Società Italiana di Fisica, Springer-Verlag 2000