TY - JOUR
T1 - Search for nearly mass degenerate charginos and neutralinos at LEP
AU - Abbiendi, G
AU - Anagnostou, Georgios
AU - Bell, Paul
AU - Bloodworth, Ian
AU - Charlton, David
AU - Hawkes, Christopher
AU - Homer, Roger
AU - Jovanovic, Predrag
AU - McMahon, Thomas
AU - O'Neale, Stephen
AU - Watson, Miriam
AU - Watkins, Peter
AU - Watson, Alan
AU - Watson, Nigel
AU - Wilson, John
PY - 2003/8/1
Y1 - 2003/8/1
N2 - 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.
AB - 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.
U2 - 10.1140/epjc/s2003-01237-x
DO - 10.1140/epjc/s2003-01237-x
M3 - Article
VL - 29
SP - 479
EP - 489
JO - European Physical Journal C
JF - European Physical Journal C
IS - 4
ER -