A search for gamma-gamma decays of a Higgs boson is performed in the data sample collected at LEP with the ALEPH detector between 1991 and 1999. This corresponds to an integrated luminosity of 672 pb-1 at centre-of-mass energies ranging from 88 to 202 GeV.The search is based on topologies arising from a Higgs boson produced in association with a fermion pair via the Higgs-strahlung process Image , with Image or Image . Twenty-two events are selected in the data, while 28 events are expected from standard model processes. An upper limit is derived, as a function of the Higgs boson mass, on the product of the Image cross section and the H→γγ branching fraction. In particular, a fermiophobic Higgs boson produced with the standard model cross section is excluded at 95% confidence level for all masses below 100.7 GeV/c2.
|Titolo:||Search for gamma gamma decays of a Higgs boson produced in association with a fermion pair in e+ e- collisions at LEP|
|Parole Chiave:||standard model ; Higgs boson ; elementary particle physics ; LEP ; accelerators|
|Settore Scientifico Disciplinare:||Settore FIS/01 - Fisica Sperimentale|
|Data di pubblicazione:||2000|
|Digital Object Identifier (DOI):||10.1016/S0370-2693(00)00821-2|
|Appare nelle tipologie:||01 - Articolo su periodico|