A study of the ν̅ -jet mass spectrum in e+p⃗ν̅ X events at a center-of-mass energy 300 GeV has been performed with the ZEUS detector at the HERA collider at DESY using an integrated luminosity of 47.7 pb-1. The mass spectrum is in good agreement with that expected from standard model processes over the ν̅ -jet mass range studied. No significant excess attributable to the decay of a narrow resonance is observed. By using both e+p⃗e+X and e+p⃗ν̅ X data, mass-dependent limits are set on the s-channel production of scalar and vector resonant states. Couplings to first-generation quarks are considered and limits are presented as a function of the e+q and ν̅ q branching ratios. These limits are used to constrain the production of leptoquarks and R-parity violating squarks.
Search for resonance decays to a ν̅ plus jet in e+p scattering at DESY HERA
GARFAGNINI, ALBERTO;BRUGNERA, RICCARDO;CARLIN, ROBERTO;L. Stanco;STROILI, ROBERTO;
2001
Abstract
A study of the ν̅ -jet mass spectrum in e+p⃗ν̅ X events at a center-of-mass energy 300 GeV has been performed with the ZEUS detector at the HERA collider at DESY using an integrated luminosity of 47.7 pb-1. The mass spectrum is in good agreement with that expected from standard model processes over the ν̅ -jet mass range studied. No significant excess attributable to the decay of a narrow resonance is observed. By using both e+p⃗e+X and e+p⃗ν̅ X data, mass-dependent limits are set on the s-channel production of scalar and vector resonant states. Couplings to first-generation quarks are considered and limits are presented as a function of the e+q and ν̅ q branching ratios. These limits are used to constrain the production of leptoquarks and R-parity violating squarks.Pubblicazioni consigliate
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