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首页> 外文期刊>Computer physics communications >The precision Monte Carlo event generator KK for two-fermion final states in e~+e~- collisions
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The precision Monte Carlo event generator KK for two-fermion final states in e~+e~- collisions

机译：精确的蒙特卡洛事件生成器KK，用于e〜+ e〜-碰撞中的两个费米子最终状态

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摘要

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-bar + 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).
机译：我们介绍了蒙特卡洛事件发生器KK版本4.13，用于对过程e〜+ e〜-→ff-bar +nγ，f =μ，τ，d，u，s，c，b，在LEP，SLC，未来线性对撞机，b，c，τ工厂等从τ轻子阈值到1 Tev的质心能量处进行计算。在基于Yennie-Frautschi-Suura指数的相干互斥（CEEX）内，QED高达二阶，包括所有干扰效应。使用DIZET 6.21库，可将电子弱校正包含在第一阶中，并具有更高阶的扩展名。最终状态夸克根据使用JETSET的parton淋浴模型强化。光束可以纵向和横向极化。使用TAUOLA库模拟τ轻子的衰变，同时考虑自旋极化效应。特别地，以精确的方式结合了初始状态光束和最终状态τ的完整的自旋相关密度矩阵。以逼真的方式模拟了由于束流效应引起的效应。关于KORALZ的主要改进包括：（a）包含初始最终状态QED干扰;（b）包含两个光子的精确矩阵元素;以及（c）包含τ衰减中的横向自旋相关性（如在KORALB）。

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