Tests of the standard model and constraints on new physics from measurements of fermion-pair production at 189 GeV at LEP
Cross-sections and angular distributions for hadronic and lepton pair final states in \({\rm e^+e^-}\) collisions at a centre-of-mass energy near 189 GeV, measured with the OPAL detector at LEP, are presented and compared with the predictions of the Standard Model. The results are used to measure th...
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| Veröffentlicht in: | The European physical journal. C, Particles and fields Particles and fields, 2000-04, Vol.13 (4), p.553-572 |
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| container_title | The European physical journal. C, Particles and fields |
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| creator | Abbiendi et al, G. |
| description | Cross-sections and angular distributions for hadronic and lepton pair final states in \({\rm e^+e^-}\) collisions at a centre-of-mass energy near 189 GeV, measured with the OPAL detector at LEP, are presented and compared with the predictions of the Standard Model. The results are used to measure the energy dependence of the electromagnetic coupling constant \(\alpha_{\rm em}\), and to place limits on new physics as described by four-fermion contact interactions or by the exchange of a new heavy particle such as a sneutrino in supersymmetric theories with R-parity violation. A search for the indirect effects of the gravitational interaction in extra dimensions on the \(\mu^+\mu^-\) and \(\tau^+\tau^-\) final states is also presented. |
| doi_str_mv | 10.1007/s100520000315 |
| format | Article |
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| ispartof | The European physical journal. C, Particles and fields, 2000-04, Vol.13 (4), p.553-572 |
| issn | 1434-6044 1434-6052 |
| language | eng |
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| source | SpringerLink Journals; Springer Nature OA Free Journals |
| subjects | Constraint modelling Dependence Electromagnetic coupling Energy measurement Fermions Gravitational effects Leptons Pair production Quarks |
| title | Tests of the standard model and constraints on new physics from measurements of fermion-pair production at 189 GeV at LEP |
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