A Study of the reaction e+ e- ---> mu+ mu- gamma (ISR) at LEP and search for new physics at annihilation energies near 80-GeV
(1997) Zeitschrift für Physik. C, Particles and fields — Vol. 75, n° 4, p. 581-592 (1997)
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- Abstract
- (en) A study of the channel e + e - → μ + μ γ ISR, where γ ISR 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 Z 0 peak is obtained by using the events with relatively hard initial state radiative photon(s) (E γ > 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 https://static-content.springer.com/image/art%3A10.1007%2Fs002880050504/MediaObjects/288_2014_1_Fig1_HTML.gif , 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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Citations
Abreu, P., Cortina Gil, E., DELPHI Collaboration, & et al. (1997). A Study of the reaction e+ e- ---> mu+ mu- gamma (ISR) at LEP and search for new physics at annihilation energies near 80-GeV. Zeitschrift für Physik. C, Particles and fields, 75(4), 581-592. https://doi.org/10.1007/s002880050504 (Original work published 1997)