## KK

swMATH ID: | 10792 |

Software Authors: | Jadach, S.; Ward, B.F.L.; Wa̧s, Z. |

Description: | The precision Monte Carlo event generator KK for two-fermion final states in \(e^+ e^-\) collisions. We present the Monte Carlo event generator 𝒦𝒦 version 4.13 for precision predictions of the electroweak standard model for the process e + e - →ff ¯+nγ, f=μ,τ,d,u,s,c,b, at centre-of-mass 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 Yennie-Frautschi-Suura exponentiation. Electroweak corrections are included in first order, with higher-order extensions, using the DIZET 6.21 library. Final-state 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 initial-state 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 initial-final 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). |

Homepage: | http://www.cpc.cs.qub.ac.uk/summaries/ADMD_v1_0.html |

Keywords: | coherent exclusive exponentiation; electroweak corrections; Yennie-Frautschi-Suura exponentiation; parton shower model; spin polarization effects |

Related Software: | YFSWW3; KoralW; TAUOLA; KorWan; QCDNUM16; EvolFMC; NEXTCALIBUR; HELAC; WWGENPV; CompHep; PHEGAS; PHOTOS; JETSET; DIZET; KORALZ; BASES/SPRING; Foam |

Cited in: | 8 Publications |

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### Cited by 10 Authors

6 | Jadach, Stanisław |

3 | Placzek, Wieslaw |

3 | Skrzypek, Maciej |

3 | Ward, Bennie F. L. |

3 | Wąs, Zbigniew |

1 | Gazeau, Jean-Pierre |

1 | Masáková, Zuzana |

1 | Pelantová, Edita |

1 | Sablonnière, Paul |

1 | Stokłosa, P. |

### Cited in 3 Serials

5 | Computer Physics Communications |

1 | BIT |

1 | Nuclear Physics. B. Proceedings Supplements |

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