Searches at HERA for Squarks in R-Parity Violating Supersymmetry

Details Searches at HERA for Squarks in R-Parity Violating Supersymmetry Searches at HERA for Squarks in R-Parity Violating Supersymmetry

2001-02-28

arxiv.org/abs/hep-ex/0102050v1

Eur.Phys.J.C20:639-657,2001

Physics

High Energy Physics

High Energy Physics - Experiment

32 pages, 14 figures, 3 tables

Scientific paper

10.1007/s100520100716

A search for squarks in R-parity violating supersymmetry is performed in e^+p collisions at HERA at a centre of mass energy of 300 GeV, using H1 data corresponding to an integrated luminosity of 37 pb^(-1). The direct production of single squarks of any generation in positron-quark fusion via a Yukawa coupling lambda' is considered, taking into account R-parity violating and conserving decays of the squarks. No significant deviation from the Standard Model expectation is found. The results are interpreted in terms of constraints within the Minimal Supersymmetric Standard Model (MSSM), the constrained MSSM and the minimal Supergravity model, and their sensitivity to the model parameters is studied in detail. For a Yukawa coupling of electromagnetic strength, squark masses below 260 GeV are excluded at 95% confidence level in a large part of the parameter space. For a 100 times smaller coupling strength masses up to 182 GeV are excluded.

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