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Measurement of the \(\mathit{H Z\gamma}\) coupling at the future linear e + e - collider

  • M. Dubinin
  • H. J. Schreiber
  • A. Vologdin
theoretical physics

Abstract.

We examine the prospects for measuring the \(H Z \gamma\) coupling of a standard model-like Higgs boson with a mass between 120 and 160 GeV at the future TESLA linear e + e - collider, assuming an integrated luminosity of 1 ab-1 and a center-of-mass energy of 500 GeV. We consider the Higgs boson produced in association with \(\nu_e \bar{\nu_e}\) via the W W fusion reaction \(e^+e^- \rightarrow \nu_e \bar{\nu_e} H\), followed by the rare decay into a Z boson and a photon, \(H \rightarrow Z \gamma\). Accounting for all main background contributions, a precision of 27% can be achieved in unpolarized e + e - collisions for M H = 140 GeV. With appropriate initial state polarisations \(\Delta\)BF( \(H \rightarrow Z \gamma\))/BF( \(H \rightarrow Z \gamma\)), or the precisions on the \(H \rightarrow Z \gamma\) partial width, can be improved to 17% and provide valuable information on the \(H Z \gamma\) coupling. For M H = 120 and 160 GeV, the small significance of the signals in unpolarized collisions sets upper limits of 79% respectively 72% at 90% confidence level on the \(H \rightarrow Z \gamma\) branching fraction.

Keywords

Confidence Level Higgs Boson State Polarisation Fusion Reaction Small Significance 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin/Heidelberg 2003

Authors and Affiliations

  • M. Dubinin
    • 1
  • H. J. Schreiber
    • 2
  • A. Vologdin
    • 1
  1. 1.Institute of Nuclear PhysicsMoscow State UniversityMoscowRussia
  2. 2.DESY ZeuthenZeuthenGermany

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