A study of the reaction e(+)e(-)->mu(+)mu(-)gamma(ISR) at LEP and search for new physics at annihilation energies near 80 GeV
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DELPHI Collaboration; Ferrer Soria, Antonio; Higón Rodríguez, Emilio; Castillo Giménez, María Victoria; Martí García, Salvador; Alemany Fernández, Reyes; Cabrera Urbán, Susana; Cortina Gil, Eduardo; Fuster Verdú, Juan A.; García García, Carmen; Hernández Rey, Juan José; Lacasta Llácer, Carlos; Martínez Vidal, Fernando; Navas Concha, Sergio; Salt Cairols, José
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Aquest document és un/a article, creat/da en: 1997
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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.
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