Szczegóły publikacji
Opis bibliograficzny
Search for anomalous production of acoplanar di-lepton events in $e^{+}e^{-}$ collisions at $\sqrt{s}$=183 and 189 GeV / G. Abbiendi [et al.], M. PRZYBYCIEŃ [et al.] // The European Physical Journal. C, Particles and Fields ; ISSN 1434-6044. — 2000 — vol. 14 iss. 1, s. 51–71. — Bibliogr. s. 70–71, Abstr. — Publikacja dostępna online od: 2000-04-06. — M. Przybycień - pierwsza afiliacja: CERN, European Organisation for Particle Physics, Geneva, Switzerland
Autorzy (317)
- AGHPrzybycień Mariusz
- Abbiendi Giovanni
Dane bibliometryczne
| ID BaDAP | 10902 |
|---|---|
| Data dodania do BaDAP | 2002-11-21 |
| Tekst źródłowy | URL |
| DOI | 10.1007/s100520000335 |
| Rok publikacji | 2000 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Czasopismo/seria | European Physical Journal, C |
Abstract
A selection of di-lepton events with significant missing transverse momentum has been performed using a total data sample of 237.4 pb -1 at e + e - centre-of-rnass energies of approximately 183 GeV and 189 GeV. The observed numbers of events - 78 at 183 GeV and 301 at 189 GeV - are consistent with the numbers expected from Standard Model processes, which arise predominantly from W + W - production with both W bosons decaying leptonically. This topology is also an experimental signature for the pair production of new particles that decay to a charged lepton accompanied by one or more invisible particles. Discrimination techniques are described that optimise the sensitivity to particular new physics channels. No evidence for new phenomena is apparent. Upper limits on the production cross-section times branching ratio squared for sleptons and for leptonically decaying charginos and charged Higgs are presented in a manner intended to minimise the number of model assumptions. Assuming a 100% branching ratio for the decay ℓ̃ ± R → ℓ ± χ̃01 , where χ̃01 is the lightest neutralino, we exclude at 95% CL: right-handed smuons with masses below 82.3 GeV for m μ̃- - m χ̃01 > 3 GeV and right-handed staus with masses below 81.0 GeV for m τ̃- -m χ̃01 > 8 GeV. Right-handed selectrons are excluded at 95% CL for masses below 87.1 GeV for m ẽ - m χ̃01 > 5 GeV, within the framework of the Minimal Supersymmetric Standard Model assuming μ, < - 100 GeV and tan β= 1.5. Charged Higgs bosons, H ± , are excluded at 95% CL for masses below 82.8 GeV, assuming a 100% branching ratio for the decay H ± → τ ± v τ .
