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A search for excited neutrinos in e−pe−p collisions at HERA


Aaron, F D; Alexa, C; Andreev, V; Antunovic, B; Aplin, S; Müller, K; Nowak, K; Robmann, P; Schmitz, C; Schöning, A; Straumann, U; Truöl, P; H1 Collaboration; et al (2008). A search for excited neutrinos in e−pe−p collisions at HERA. Physics Letters B, 663(5):382-389.

Abstract

A search for first generation 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 ν*→νγ, ν*→νZ and ν*→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 ν* production cross sections and on the ratio of the coupling to the compositeness scale f/Λ are derived within gauge mediated models. A limit on f/Λ, 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.

Abstract

A search for first generation 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 ν*→νγ, ν*→νZ and ν*→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 ν* production cross sections and on the ratio of the coupling to the compositeness scale f/Λ are derived within gauge mediated models. A limit on f/Λ, 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.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2008
Deposited On:19 Jan 2009 14:27
Last Modified:06 Dec 2017 16:54
Publisher:Elsevier
ISSN:0370-2693
Publisher DOI:https://doi.org/10.1016/j.physletb.2008.04.020
Related URLs:http://www.sciencedirect.com/science/journal/03702693 (Publisher)

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