Speaker
Eram Syed Rizvi
(Queen Mary, University of London)
Description
A search for physics beyond the Standard Model in neutral current deep inelastic scattering at high negative four-momentum transfer squared Q2 is performed in ep collisions at HERA. The differential cross section d\sigma/dQ2 , measured using the full H1 data sample corresponding to an integrated luminosity of 446 pb-1, is compared to the Standard Model prediction. No signicant deviation is observed. Limits on various models predicting new phenomena at high Q2 are derived. For general four-fermion eeqq contact interaction models,
lower limits on the compositeness scale Lambda are set in the range 3:6 TeV to 7:2 TeV. Leptoquarks with masses MLQ and couplings lambda are constrained to M_LQ/lambda > 0:41-1.86 TeV and limits on squarks in R-parity violating supersymmetric models are derived. A lower
limit on the gravitational scale in (4+n) dimensions of MS > 0:9 TeV is established for low-scale quantum gravity effects in models with large extra dimensions. For the light quark radius an upper bound of Rq < 0:65 x10^-18 m is determined.
Author
Eram Syed Rizvi
(Queen Mary, University of London)
