Search for contact interactions in e^{}p collisions at HERA
Abstract
A search for physics beyond the Standard Model in neutral current deep inelastic scattering at high negative fourmomentum transfer squared Q^{} is performed in e^{}p collisions at HERA. The differential cross section dσ/dQ^{}, measured using the full H1 data sample corresponding to an integrated luminosity of 446 pb^{}, is compared to the Standard Model prediction. No significant deviation is observed. Limits on various models predicting new phenomena at high Q^{} are derived. For general fourfermion eeqq contact interaction models, lower limits on the compositeness scale Λ are set in the range 3.6 TeV to 7.2 TeV. Leptoquarks with masses M_{} and couplings λ are constrained to M_{}/λ>0.411.86 TeV and limits on squarks in Rparity violating supersymmetric models are derived. A lower limit on the gravitational scale in 4+n dimensions of M_{}>0.9 TeV is established for lowscale quantum gravity effects in models with large extra dimensions. For the light quark radius an upper bound of R_{}<0.65ṡ10^{} m is determined.
 Publication:

Physics Letters B
 Pub Date:
 November 2011
 DOI:
 10.1016/j.physletb.2011.09.109
 arXiv:
 arXiv:1107.2478
 Bibcode:
 2011PhLB..705...52H
 Keywords:

 High Energy Physics  Experiment
 EPrint:
 20 pages, 6 figures and 5 tables