Leptoquarks And Compositeness Scales From A Contact Interaction Analysis Of Deep-Inelastic E(+/-)P Scattering At Hera

Abstract A contact interaction analysis is presented to search for new phenomena beyond the Standard Model in deep inelastic e ± p → e ± hadrons scattering. The data are collected with the H1 detector at HERA and correspond to integrated luminosities of 0.909 pb −1 and 2.947 pb −1 for electron and positron beams, respectively. The differential cross sections dσ/d Q 2 are measured in the Q 2 range between 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.