2022 Impact factor 4.4
Particles and Fields

Eur. Phys. J. C 19, 455-461
DOI: 10.1007/s100520100636

Measuring the Higgs branching fraction into two photons at future linear e+e- colliders

E. Boos1, J.-C. Brient2, D.W. Reid3, H.J. Schreiber4 and R. Shanidze5

1  Institute of Nuclear Physics, Moscow State University, 119 899 Moscow, Russia
2  Laboratoire de Physique Nucléaire et des Hautes Energies, Ecole Polytechnique, IN2P3-CNRS, 91128 Palaiseau Cedex, France
3  NIKHEF, Postbus 41882, 1009 DB Amsterdam, The Netherlands
4  DESY Zeuthen, 15735 Zeuthen, Germany
5  High Energy Physics Institute, Tbilisi State University, 380086 Tbilisi, Georgia

(Received: 6 December 2000 / Revised version: 19 February 2001 / Published online: 23 March 2001 -© Springer-Verlag 2001)

We examine the prospects for a measurement of the branching fraction of the $\gamma \gamma$ decay mode of a Standard Model-like Higgs boson with a mass of 120 GeV$\!/c^2$ at the future TESLA linear e+e- collider, assuming an integrated luminosity of 1 ab-1 and centre-of-mass energies of 350 GeV and 500 GeV. A relative uncertainty on BF( $H \rightarrow \gamma \gamma$) of 16% can be achieved in unpolarised e+e- collisions at $\sqrt{s}$ = 500 GeV, while for $\sqrt{s}$ = 350 GeV the expected precision is slightly poorer. With appropriate initial state polarisations the uncertainty can be improved to 10%. If this measurement is combined with a measurement of the total Higgs width, a precision of 10% on the Higgs boson partial width for the $\gamma \gamma$ decay mode appears feasible.

© Società Italiana di Fisica, Springer-Verlag 2001