# A search for excited neutrinos in e−pe−p collisions at HERA - Zurich Open Repository and Archive

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.

## Citations

15 citations in Web of Science®
28 citations in Scopus®

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Item Type: Journal Article, refereed, original work 07 Faculty of Science > Physics Institute 530 Physics English 2008 19 Jan 2009 14:27 05 Apr 2016 12:50 Elsevier 0370-2693 https://doi.org/10.1016/j.physletb.2008.04.020 http://www.sciencedirect.com/science/journal/03702693 (Publisher)