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Search for new physics phenomena in ep contact interactions at HERA |
| Reference |
Juergen Scheins, talk presented at Recontres de Physique de la Vallee d'Aoste, march 2002, March 2002 |
| Document |
Conference paper
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| Contact |
Uli Martyn, Juergen Scheins |
| Abstract |
Deep-inelastic e^+- p scattering at high momentum transfer Q^2 is used to search for eq contact interactions associated to scales not directly accessible at Hera. The cross section measurements d sigma / d Q^2, corresponding to integrated luminosities of 16.4 pb^-1 of e^-p data and 98.6 pb^-1 of e^+p data, are well described by the Standard Model and are analysed to set constraints on new phenomena. For conventional contact interactions lower limits can be set on compositeness scales Lambda at 1.8 - 5.4 TeV and on couplings to leptoquarks and R-parity violating squarks of M/lambda > 0.3 - 1.4 TeV. A search for low scale quantum gravity effects in models with large extra dimensions gives limits on the effective Planck scale of M_S > 0.8 TeV. A form factor analysis yields a radius of R_q < 0.8 10^-18 m for the light quarks. |
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