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Search for pair-produced neutralinos in events with photons and missing energy from e+e- collisions at \(\sqrt s = 130 - 183\) GeV

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Abstract

The events with two photons and missing (transverse) energy collected by the DELPHI detector at centre-of-mass energies between 130 GeV and 183 GeV have been studied to search for processes of the type e+e- → YY with the subsequent decay Y → X7, where X is an undetectable neutral particle. Reactions of this kind are expected in supersymmetric models, where the Y particle can be either the lightest neutralino, decaying to a photon and a gravitino, or the next-to-lightest neutralino, decaying to a photon and the lightest neutralino. To study the case of long-lived Y particles, a search for single-photon events with the reconstructed photon axis pointing far from the beam interaction region has also been performed. No evidence for a deviation from Standard Model expectations has been observed in the data and upper limits have been derived on the signal cross-section as a function of the the X and Y masses and of the Y mean decay path.

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DELPHI Collaboration., Abreu, P., Adye, T. et al. Search for pair-produced neutralinos in events with photons and missing energy from e+e- collisions at \(\sqrt s = 130 - 183\) GeV. Eur. Phys. J. C 6, 371–384 (1999). https://doi.org/10.1007/s100529801044

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