# Search for Contact Interactions in $e^{\pm}p$ Collisions at HERA

Abstract : A search for physics beyond the Standard Model in neutral current deep inelastic scattering at high negative four-momentum transfer squared Q^2 is performed in e^{\pm}p collisions at HERA. The differential cross section ds/dQ^2, measured using the full H1 data sample corresponding to an integrated luminosity of 446 pb^{-1}, is compared to the Standard Model prediction. No significant deviation is observed. Limits on various models predicting new phenomena at high Q^2 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 M_{LQ} 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 M_{S} > 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 R_q< 0.65 10^{-18} m is determined.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00635902
Contributor : Sabine Starita <>
Submitted on : Wednesday, October 26, 2011 - 11:45:06 AM
Last modification on : Wednesday, September 16, 2020 - 4:20:32 PM

### Citation

F.D. Aaron, C. Alexa, V. Andreev, S. Backovic, A. Baghdasaryan, et al.. Search for Contact Interactions in $e^{\pm}p$ Collisions at HERA. Physics Letters B, Elsevier, 2011, 705, pp.52-58. ⟨10.1016/j.physletb.2011.09.109⟩. ⟨in2p3-00635902⟩

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