signature=308636a8c0500f38ffe57f87248a6c07,Signals for supersymmetry at HERA

摘要：

We consider the baryon parity signals at HERA for the case of the MSSM production mechanisms and the decays via the lepton number violating couplings LiQD. We can probe very small Yukawa couplings λ′ ⪆ 3 · 10−6, limited only by the decay length of the LSP. We assume the LSP to be the lightest neutralino and study its decays in detail. We present the matrix element squared for the tree-level decay amplitude of a generally mixed neutralino explicitly. We find that the braching fraction to charged leptons strongly depends on the SUSY parameters and can differ significantly from the naively expected 50%. The SUSY mass reaches of the studied processes in the ZEUS detector at HERA were found to be : (m(≈e, ≈v) + m (t∼q)) ⩽ 170 GeV, 195 GeV and 205 GeV for the LτQD, LμQDand LeQD couplings respectively. These are well above existing limits on R-parity violating SUSY from previous experiments. We conclude that HERA offers a very promising discovery potential for SUSY.

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