Search for contact interactions in deep inelastic $e^+p\to e^+X$ scattering at HERA

The ZEUS Collaboration:     J. Breitweg - et al.

doi:doi:10.1007/s100520000336

EPJ

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2023 Impact factor 4.2

Particles and Fields

Eur. Phys. J. C 14, 239-254
DOI 10.1007/s100520000336

Search for contact interactions in deep inelastic $e^+p\to e^+X$ scattering at HERA

The ZEUS Collaboration

J. Breitweg - et al.

Argonne National Laboratory, Argonne, IL, USA

Received: 18 May 1999 / Revised version: 14 January 2000 /
Published online: 25 February 2000 - © Springer-Verlag 2000

Abstract
In a search for signatures of physics processes beyond the Standard Model, various eeqq vector contact-interaction hypotheses have been tested using the high-Q² deep inelastic neutral-current e⁺p scattering data collected with the ZEUS detector at HERA. The data correspond to an integrated luminosity of $47.7\,{pb}^{-1}$ of e⁺p interactions at $300\, {{Ge}{V\/}}$ center-of-mass energy. No significant evidence of a contact-interaction signal has been found. Limits at the $95\%$ confidence level are set on the contact-interaction amplitudes. The effective mass scales $\Lambda$ corresponding to these limits range from $1.7\, {{Te}{V\/}}$ to $5\, {{Te}{V\/}}$ for the contact-interaction scenarios considered.