The precision Monte Carlo event generator KK for twofermion final states in e ^{+}e ^{} collisions
Abstract
We present the Monte Carlo event generator KK version 4.13 for precision predictions of the Electroweak Standard Model for the process e ^{+}e ^{}→f f̄+nγ , f=μ,τ,d,u,s,c,b , at centreofmass energies from τ lepton threshold to 1 TeV, that is for LEP, SLC, future Linear Colliders, b,c,τ factories, etc. Effects due to photon emission from initial beams and outgoing fermions are calculated in QED up to second order, including all interference effects, within Coherent Exclusive Exponentiation (CEEX), which is based on YennieFrautschiSuura exponentiation. Electroweak corrections are included in first order, with higherorder extensions, using the DIZET 6.21 library. Finalstate quarks hadronize according to the parton shower model using JETSET. Beams can be polarized longitudinally and transversely. Decay of the τ leptons is simulated using the TAUOLA library, taking into account spin polarization effects as well. In particular the complete spin correlations density matrix of the initialstate beams and final state τ 's is incorporated in an exact manner. Effects due to beamstrahlung are simulated in a realistic way. The main improvements with respect to KORALZ are: (a) inclusion of the initialfinal state QED interference, (b) inclusion of the exact matrix element for two photons, and (c) inclusion of the transverse spin correlations in τ decays (as in KORALB).
 Publication:

Computer Physics Communications
 Pub Date:
 August 2000
 DOI:
 10.1016/S00104655(00)000485
 arXiv:
 arXiv:hepph/9912214
 Bibcode:
 2000CoPhC.130..260J
 Keywords:

 High Energy Physics  Phenomenology
 EPrint:
 Source code available from http://home.cern.ch/jadach