Leptoquarks and Compositeness Scales from a Contact Interaction Analysis of Deep Inelastic $e^{\pm }p$ Scattering at HERA

Abstract

A contact interaction analysis is presented to search for new phenomena beyond the Standard Model in deep inelastic $e^{\pm }p\to e^{\pm }hadrons$ scattering. The data are collected with the H1 detector at HERA and correspond to integrated luminosities of $0.909{\mathrm{pb}}^{-1}$ and $2.947{\mathrm{pb}}^{-1}$ for electron and positron beams, respectively. The differential cross sections $d\sigma /d{Q}^2$ are measured in the $Q^2$ range bet\-ween $160 \ \GeV^2$ and $20,000 \ \GeV^2$. The absence of any significant deviation from the Standard Model prediction is used to constrain the couplings and masses of new leptoquarks and to set limits on electron--quark compositeness scales and on the radius of light quarks.

16 pages, latex, 2 figures appended as uuencoded file