PHENOMENOLOGICAL CONSTRAINTS ON POSSIBLE NEW HADRONIC MASS SCALES (THEORETICAL, PARTICLE, PHYSICS).

摘要

The effects of spin 3/2 excited quarks are considered as probes of a possible new hadronic mass scale (WEDGE). A specific model is developed which describes virtual spin 3/2 quarks of mass of O((WEDGE)). Induced effects, which are corrections to the standard SU(2) x U(1) electroweak model, include right handed charged currents and flavour changing neutral currents. A model independent classification of all SU(3) x SU(2) x U(1) invariant quark operators of dimension six or less is also presented. Ambiguities in converting this analysis and existing experiments to a definitive lower bound for (WEDGE) are discussed. It is found, depending on the strengths of certain Higgs couplings and the underlying global flavour symmetries in the absence of Higgs couplings, that a lower bound as small as (WEDGE) > 500 Gev or as large as (WEDGE) > 100 Tev are possible.;In addition, the general form for deep inelastic cross-sections obtained from all SU(3) x SU(2) x U(1) invariant operators of dimension six or less is presented.