Regular Article - Theoretical Physics
Two-particle kinematic distributions from new physics at an electron–positron collider with polarized beams
Centre for High Energy Physics, Indian Institute of Science, Bangalore, 560 012, India
2 Theoretical Physics Division, Physical Research Laboratory, Navrangpura, Ahmedabad, 380 009, India
Revised: 28 May 2008
Published online: 5 July 2008
The kinematic distributions in two-particle inclusive processes at an e+e- collider arising from standard-model s-channel exchange of a virtual γ or Z and the interference of the standard-model contribution with contributions from physics beyond the standard model involving s-channel exchanges are derived entirely in terms of the space-time signature of such new physics. Transverse as well as longitudinal polarizations of the electron and positron beams are taken into account. We show how these model-independent distributions can be used to deduce some general properties of the nature of the interaction. We then specialize to two specific two-particle final states, viz., ZH, where H is one of the Higgs bosons in a model with an extended Higgs sector, and ff̄, where f, f̄ are a pair of conjugate charged fermions, wherein distributions of two (of the possibly several) decay products are measured. We show how some of the properties of the distributions have been realized in the analysis of physics beyond the standard model in earlier work which made use of two-particle angular distributions.
© Springer-Verlag , 2008