Search for pair produced neutralinos in events with photons and missing energy from $e^{+} e^{-}$ collisions at $S^{(1/2)}$ = 130-GeV to 183-GeV

Abreu, P.; Adye, T.; Adzic, P.; Azhinenko, I.; Alekseev, G.D.; Alemany, R.; Allport, P.P.; Almehed, S.; Amaldi, U.; Amato, S.

doi:10.1007/s100529801044

Search for pair produced neutralinos in events with photons and missing energy from $e^{+} e^{-}$ collisions at $S^{(1/2)}$ = 130-GeV to 183-GeV

DELPHI

Collaboration

Sep, 1998

29 pages

Published in:

Eur.Phys.J.C 6 (1999) 371-384

DOI:

10.1007/s100529801044

Report number:

CERN-EP-98-142

Experiments:

CERN-LEP-DELPHI

View in:

reference search35 citations

Citations per year

Abstract: (Springer)

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.

electron positron: colliding beams
electron positron: annihilation
sparticle: search for
neutralino: pair production
neutralino: radiative decay
final state: (2photon missing-energy)
final state: (photon)
gravitino
channel cross section: upper limit
decay: path length

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Search for pair produced neutralinos in events with photons and missing energy from e+e−e^{+} e^{-}e+e− collisions at S(1/2)S^{(1/2)}S(1/2) = 130-GeV to 183-GeV

Citations per year

Search for pair produced neutralinos in events with photons and missing energy from $e^{+} e^{-}$ collisions at $S^{(1/2)}$ = 130-GeV to 183-GeV