Search for excited quarks in ep collisions at HERA
Abstract
A search for excited quarks is performed using the full ep data sample collected by the H1 experiment at HERA, corresponding to a total integrated luminosity of 475 pb. 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.
- Publication:
-
Physics Letters B
- Pub Date:
- July 2009
- DOI:
- 10.1016/j.physletb.2009.06.044
- arXiv:
- arXiv:0904.3392
- Bibcode:
- 2009PhLB..678..335H
- Keywords:
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- High Energy Physics - Experiment
- E-Print:
- Revised version, with small changes to the text. 19 pages, 5 figures