Search for nearly mass degenerate charginos and neutralinos at LEP

G Abbiendi, Georgios Anagnostou, Paul Bell, Ian Bloodworth, David Charlton, Christopher Hawkes, Roger Homer, Predrag Jovanovic, Thomas McMahon, Stephen O'Neale, Miriam Watson, Peter Watkins, Alan Watson, Nigel Watson, John Wilson

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

A search was performed for charginos with masses close to the mass of the lightest neutralino in e(+)e(-) collisions at centre-of-mass energies of 189-209 GeV recorded by the OPAL detector at LEP. Events were selected if they had an observed high-energy photon from initial state radiation, reducing the dominant background from two-photon scattering to a negligible level. No significant excess over Standard Model expectations has been observed in the analysed data set corresponding to an integrated luminosity of 570 pb(-1). Upper limits were derived on the chargino pair-production cross-section, and lower limits on the chargino mass were derived in the context of the Minimal Supersymmetric Extension of the Standard Model for the gravity- and anomaly-mediated Supersymmetry breaking scenarios.
Original languageEnglish
Pages (from-to)479-489
Number of pages11
JournalEuropean Physical Journal C
Volume29
Issue number4
DOIs
Publication statusPublished - 1 Aug 2003

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