Szczegóły publikacji
Opis bibliograficzny
Search for anomalous photonic events with missing energy in $e^{+}e^{-}$ collisions at $\sqrt{s}$=130,136 and 183 GeV / G. Abbiendi [et al.], M. Przybycień [et al.] // The European Physical Journal. C, Particles and Fields ; ISSN 1434-6044. — 1999 — vol. 8 iss. 1, s. 23–40. — Bibliogr. s. 40, Abstr. — Publikacja dostępna online od: 1999-03-01. — M. Przybycień - afiliacja: CERN, Geneva, Switzerland
Autorzy (320)
- Abbiendi Giovanni
- Przybycień Mariusz
Dane bibliometryczne
| ID BaDAP | 2739 |
|---|---|
| Data dodania do BaDAP | 2001-04-18 |
| Tekst źródłowy | URL |
| DOI | 10.1007/s100520050442 |
| Rok publikacji | 1999 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Creative Commons | |
| Czasopismo/seria | European Physical Journal, C |
Abstract
Photonic events with large missing energy have been observed in e(+)e(-) collisions at centre-of-mass energies of 130, 136 and 183 GeV collected in 1997 using the OPAL detector at LEP. Results are presented for event topologies with a single photon and missing transverse energy or with an acoplanar photon pair. Cross-section measurements are performed within the kinematic acceptance of each selection. These results are compared with the expectations from the Standard Model process e(+)e(-) –> v (v) over bar + photon(s). No evidence is observed for new physics contributions to these final states. Using the data at root s = 183 GeV, upper limits on sigma(e(+)e(-) –> XY) BR(X –> Y gamma) and sigma(e(+)e(-) –> XX) BR2 (X –> Y gamma) are derived for the case of stable and invisible Y. These limits apply to single and pair production of excited neutrinos (X = nu*,Y = nu), to neutralino production (X = <(chi)over tilde>(0)(2), Y = <(chi)over tilde>(0)(1)) and to supersymmetric models in which X = <(chi)over tilde>(0)(1) and Y = (G) over bar is a light gravitino.
