Search for contact interactions in e(+/-)p collisions at HERA H1 Collaboration
H1 Collaboration (ukupan broj autora: 204)
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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(+/-)p collisions at HERA. The differential cross section d sigma/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 A 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 GT 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 GT 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 LT 0.65 . 10(-18) m is determined. (C) 2011 Elsevier B.V. All rights reserved.
Извор:Physics Letters B, 2011, 705, 1-2, 52-58
- Helmholtz Association (HGF) [VH-NG-401], European Social Fund, (EPEAEK II) - PYTHAGORAS II, UK Science and Technology Facilities Council, UK Particle Physics and Astronomy Research Council, FNRS-FWO-Vlaanderen, Romanian National Authority for Scientific Research [PN 09370101], Polish Ministry of Science and Higher Education [DPN/N168/DESY/2009], Bundesministerium fur Bildung und Forschung, FRG [05H09GUF, 05H09VHC, 05H09VHF, 05H16PEA], VEGA SR [2/7062/27], Swedish Natural Science Research Council, CONACYT, Mexico [48778-F], Russian Foundation for Basic Research (RFBR) [1329.2008.2], Deutsche Forschungsgemeinschaft, Ministry of Science of Montenegro [05-1/3-3352], Ministry of Education of the Czech Republic [LC527, INGO-LA09042, MSM0021620859], Swiss National Science Foundation, DESY directorate, IISN-IIKW, IWT, Interuniversity Attraction Poles Programme, Belgian Science Policy
ISSN: 0370-2693 (print)