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Deep Inelastic Scattering$
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Robin Devenish and Amanda Cooper-Sarkar

Print publication date: 2003

Print ISBN-13: 9780198506713

Published to Oxford Scholarship Online: January 2010

DOI: 10.1093/acprof:oso/9780198506713.001.0001

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Beyond the Standard Model

Beyond the Standard Model

Chapter:
(p.343) 12 Beyond the Standard Model
Source:
Deep Inelastic Scattering
Author(s):

Robin Devenish

Amanda Cooper-Sarkar

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780198506713.003.0012

This chapter explains the techniques used in deep inelastic scattering to search for BSM signals and to set limits. The discussion concentrates on high energy ep scattering at HERA. All methods rely on accurate measurement of cross-sections at large Q2. The mass and coupling scales that can be probed are limited by the statistical and systematic errors of the measurements and ultimately by the energy of the HERA collider. The topics covered are: setting limits on possible compositeness scales of quarks using the classic form factor technique; direct searches for leptoquark resonances; the use of the contact interaction approach for indirect searches; and consideration of a possible BSM signal in events with a high-pT muon or electron and large missing energy. The Standard Model source for such events is W production. There is a hint of an excess event in one of the HERA experiments. An appendix outlines lepto-quark classification and contact interaction couplings.

Keywords:   BSM signals, form factor technique, leptoquark resonances

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