Search for new physics in e±q contact interactions at HERA.

Adloff, C. and Andreev, V. and Andrieu, B. and Anthonis, T. and Astvatsatourov, A. and Babaev, A. and Bähr, J. and Baranov, P. and Barrelet, E. and Bartel, W. and Baumgartner, S. and Becker, J. and Beckingham, M. and Beglarian, A. and Behnke, O. and Belousov, A. and Berger, Ch. and Berndt, T. and Bizot, J.C. and Böhme, J. and H1 Collaboration, . (2003) Search for new physics in e±q contact interactions at HERA. Physics Letters B, 568 (1-2). pp. 35-47. ISSN 0370-2693

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Deep-inelastic e±p scattering at high squared momentum transfer Q2 up to 30 000 GeV2 is used to search for eq contact interactions associated to scales far beyond the centre of mass energy. The neutral current cross section measurements dσ/dQ2, corresponding to integrated luminosities of 16.4 pb−1 of e−p data and 100.8 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 are set on compositeness scales Λ ranging between 1.6–5.5 TeV. Couplings and masses of leptoquarks and squarks in R-parity violating supersymmetry are constrained to M/λ>0.3–1.4 TeV. A search for low scale quantum gravity effects in models with large extra dimensions provides limits on the effective Planck scale of MS>0.8 TeV. A form factor analysis yields a bound on the radius of light quarks of Rq<1.0×10−18 m.

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Journal Article
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Physics Letters B
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15 Jul 2008 15:42
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17 Sep 2023 23:58