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Search for nearly mass-degenerate charginos and neutralinos at LEP

  • experimental physics
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Abstract.

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.

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Received: 26 July 2002, Published online: 11 July 2003

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The OPAL Collaboration. Search for nearly mass-degenerate charginos and neutralinos at LEP. Eur. Phys. J. C 29, 479–489 (2003). https://doi.org/10.1140/epjc/s2003-01237-x

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