A search for the Higgs boson in final states with one, two or three isolated photons has been performed based on data taken at LEP 2 by the DELPHI detector. The data analysed correspond to a total integrated luminosity of 67.5 pb(-1) at centre-of-mass energies of 161 GeV (9.7 pb(-1)), 172 GeV (10.1 pb(-1)) and 183 GeV (47.7 pb(-1)). No evidence for the processes e(+)e(-) --> H gamma with H --> b (b) over bar or gamma gamma and e(+)e(-) --> Hq (q) over bar with H --> gamma gamma was observed. Model-independent limits on sigma(e(+)e(-) --> H gamma) x BR(H --> b (b) over bar), sigma(e(+)e(-) --> Hq (q) over bar) x BR(H --> gamma gamma) and sigma(e(+)e(-) --> H gamma) x BR(H --> gamma gamma) are set, as well as model-dependent limits on Higgs boson anomalous couplings to vector bosons. (C) 1999 Published by Elsevier Science B.V. All rights reserved.
Search for the Higgs boson in events with isolated photons at LEP 2
AMAPANE, Nicola Carlo;MIGLIORE, Ernesto;ROMERO, Alessandra;
1999-01-01
Abstract
A search for the Higgs boson in final states with one, two or three isolated photons has been performed based on data taken at LEP 2 by the DELPHI detector. The data analysed correspond to a total integrated luminosity of 67.5 pb(-1) at centre-of-mass energies of 161 GeV (9.7 pb(-1)), 172 GeV (10.1 pb(-1)) and 183 GeV (47.7 pb(-1)). No evidence for the processes e(+)e(-) --> H gamma with H --> b (b) over bar or gamma gamma and e(+)e(-) --> Hq (q) over bar with H --> gamma gamma was observed. Model-independent limits on sigma(e(+)e(-) --> H gamma) x BR(H --> b (b) over bar), sigma(e(+)e(-) --> Hq (q) over bar) x BR(H --> gamma gamma) and sigma(e(+)e(-) --> H gamma) x BR(H --> gamma gamma) are set, as well as model-dependent limits on Higgs boson anomalous couplings to vector bosons. (C) 1999 Published by Elsevier Science B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.