/ Experiment-HEP hep-ex/0501030

Search for light gravitinos in events with photons and missing transverse momentum at HERA

Aktas, A. ; Andreev, V. ; Anthonis, T. ; Asmone, A. ; Babaev, A. ; Backovic, S. ; Bahr, J. ; Baranov, P. ; Barrelet, E. ; Bartel, W. ; Baumgartner, S. ; Becker, J. ; Beckingham, M. ; Behnke, O. ; Behrendt, O. ; Belousov, A. ; Berger, Ch. ; Berger, N. ; Berndt, T. ; Bizot, J.C. ; Bohme, J. ; Boenig, M.-O. ; Boudry, V. ; Bracinik, J. ; Brisson, V.

Published in: Phys.Lett.
Year: 2005
Vol.: B616
Page No: 31-42
Pages: 15

Abstract: A search for gravitinos produced in ep collisions is performed using the H1 detector at HERA. The data were taken at a centre-of-mass energy of 319 GeV and correspond to an integrated luminosity of 64.3 pb^{-1} for e^+p collisions and 13.5 pb^{-1} for e^-p collisions. If R-parity is not conserved, the t-channel exchange of a selectron can produce a neutralino, which, in models where the gravitino is the lightest supersymmetric particle, subsequently decays into a photon and a light gravitino. The resulting event signature, which involves an isolated photon, a jet and missing transverse energy, is analysed for the first time at HERA. No deviation from the Standard Model is found. Exclusion limits on the cross section and on R-parity-violating Yukawa couplings are derived in a Gauge Mediated Supersymmetry Breaking scenario. The results are independent of the squark sector. Neutralinos and supersymmetric partners of the left-handed electron with masses up to 112 GeV and 164 GeV, respectively, can be ruled out at the 95% confidence level for R-parity-violating couplings lambda' equal to 1.

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