Search for nearly mass-degenerate charginos and neutralinos at LEP
A search was performed for charginos with masses close to the mass of the lightest neutralino in \(\mathrm{e}^{+}\mathrm{e}^{-}\) 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 st...
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| Veröffentlicht in: | The European physical journal. C, Particles and fields Particles and fields, 2003-08, Vol.29 (4), p.479-489 |
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| container_title | The European physical journal. C, Particles and fields |
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| creator | The OPAL Collaboration |
| description | A search was performed for charginos with masses close to the mass of the lightest neutralino in \(\mathrm{e}^{+}\mathrm{e}^{-}\) 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. |
| doi_str_mv | 10.1140/epjc/s2003-01237-x |
| format | Article |
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| identifier | ISSN: 1434-6044 |
| ispartof | The European physical journal. C, Particles and fields, 2003-08, Vol.29 (4), p.479-489 |
| issn | 1434-6044 1434-6052 |
| language | eng |
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| source | SpringerLink Journals - AutoHoldings; Springer Nature OA Free Journals |
| subjects | Background radiation Fermions Luminosity Photons Supersymmetry |
| title | Search for nearly mass-degenerate charginos and neutralinos at LEP |
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