A Search for Excited Neutrinos in e-p Collisions at HERA

Abstract

A search for excited neutrinos is performed using the full $e^{-}p$ data sample collected by the H1 experiment at HERA at a centre-of-mass energy of 319 GeV, corresponding to a total luminosity of 184 pb${}^{-1}$.The electroweak decays of excited neutrinos ${\nu }^{\ast }\to \nu \gamma$, ${\nu }^{\ast }\to \nu Z$ and ${\nu }^{\ast }\to eW$ with subsequent hadronic or leptonic decays of the $W$ and $Z$ bosons are considered. No evidence for excited neutrino production is found. Mass dependent exclusion limits on ${\nu }^{\ast }$ production cross sections and on the ratio of the coupling to the compositeness scale $f/\Lambda$ are derived within gauge mediated models. A limit on $f/\Lambda$, independent of the relative couplings to the SU(2) and U(1) gauge bosons, is also determined. These limits extend the excluded region to higher masses than has been possible in previous excited neutrino searches.

18 pages, 4 figures, Submitted to Phys. Lett. B

References in corpus (14)

• New Generation of Parton Distributions with Uncertainties from Global QCD Analysis
• High-Energy-Physics Event Generation with PYTHIA 6.1
• Confidence Level Computation for Combining Searches with Small Statistics
• Successive Combination Jet Algorithm For Hadron Collisions
• CompHEP 4.4 - Automatic Computations from Lagrangians to Events
• Measurement and QCD Analysis of Neutral and Charged Current Cross Sections at HERA
• Measurement of Neutral and Charged Current Cross-Sections in Positron-Proton Collisions at Large Momentum Transfer
• GRAPE-Dilepton (version1.1), A Generator for Dilepton Production in ep Collisions
• Measurement of Dijet Cross Sections in Photoproduction at HERA
• Isolated electrons and muons in events with missing transverse momentum at HERA
• Searches for excited fermions in ep collisions at HERA
• Search for Excited Leptons at LEP
• Search for Excited Neutrinos at HERA
• Search for excited leptons in e+e- collisions at sqrt{s}=189-209 GeV

Cited by in corpus (11)

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• Analysis of excited neutrinos at the CLIC
• Search for Excited Quarks in ep Collisions at HERA
• Review of Searches for Rare Processes and Physics Beyond the Standard Model at HERA
• Single production of excited spin-3/2 neutrinos at linear colliders
• Electroweak and beyond the Standard Model results from HERA
• The impact of excited neutrinos on $\nu \bar{\nu }\to \gamma \gamma$ process
• High Q2 Cross Sections, Electroweak Measurements and Physics Beyond Standard Model at HERA
• Recent Results from the H1 Collaboration