6533b823fe1ef96bd127f367
RESEARCH PRODUCT
A study of the reaction e(+)e(-)->mu(+)mu(-)gamma(ISR) at LEP and search for new physics at annihilation energies near 80 GeV
Delphi CollaborationAntonio Ferrer SoriaEmilio Higón RodríguezMaría Victoria Castillo GiménezSalvador Martí GarcíaReyes Alemany FernándezSusana Cabrera UrbánEduardo Cortina GilJuan A. Fuster VerdúCarmen García GarcíaJuan José Hernández ReyCarlos Lacasta LlácerFernando Martínez VidalSergio Navas ConchaJosé Salt Cairolssubject
Col·lisions (Física nuclear)Partícules (Física nuclear)description
A study of the channel e+e− → μ+μ−γ scISR, where γ\scISR is an initial state radiation photon, is presented using data collected by the DELPHI experiment from 1991 to 1994. The total cross-section at effective annihilation energies (s′−−√) below the Z0 peak is obtained by using the events with relatively hard initial state radiative photon(s) (Eγ > ~1~GeV). The differential cross-section as a function of the muon polar production angle is also determined in order to extract the forward-backward asymmetries for the reaction e+e−→μ+μ− at energies s′−−√ between 20 and 87~GeV. The ratio of the helicity cross-sections σLL+σRRσRL+σLR, where the two subscripts stand for the helicities of the incoming e− and outgoing μ− respectively, is extracted from the differential cross-sections in order to test the Standard Model and to look for new physics near 80 GeV. No deviations from the Standard Model were found.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1997-01-01 |