# Search for excited quarks in ep collisions at HERA

Aaron, F D; Alexa, C; Aliumjiang, K; Andreev, V; Müller, K; Nowak, K; Robmann, P; Schmitz, C; Straumann, U; Truöl, P; H1 Collaboration (2009). Search for excited quarks in ep collisions at HERA. Physics Letters B, 678(4):335-343.

## Abstract

A search for excited quarks is performed using the full e±p data sample collected by the H1 experiment at HERA, corresponding to a total integrated luminosity of 475 pb−1. The electroweak decays of excited quarks q*→qγ, q*→qZ and q*→qW with subsequent hadronic or leptonic decays of the W and Z bosons are considered. No evidence for first generation excited quark production is found. Mass dependent exclusion limits on q* production cross sections and on the ratio f/Λ of the coupling to the compositeness scale are derived within gauge mediated models. These limits extend the excluded region compared to previous excited quark searches.

A search for excited quarks is performed using the full e±p data sample collected by the H1 experiment at HERA, corresponding to a total integrated luminosity of 475 pb−1. The electroweak decays of excited quarks q*→qγ, q*→qZ and q*→qW with subsequent hadronic or leptonic decays of the W and Z bosons are considered. No evidence for first generation excited quark production is found. Mass dependent exclusion limits on q* production cross sections and on the ratio f/Λ of the coupling to the compositeness scale are derived within gauge mediated models. These limits extend the excluded region compared to previous excited quark searches.

## Citations

8 citations in Web of Science®
12 citations in Scopus®

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Item Type: Journal Article, refereed, original work 07 Faculty of Science > Physics Institute 530 Physics English 2009 25 Nov 2009 14:03 05 Apr 2016 13:33 Elsevier 0370-2693 10.1016/j.physletb.2009.06.044 http://arxiv.org/abs/0904.3392v2
Permanent URL: http://doi.org/10.5167/uzh-23959