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Manuscript Title: NLLjet: a Monte-Carlo code for e+e- QCD jets including next-to- leading order terms.
Authors: K. Kato, T. Munehisa
Program title: NLLjet
Catalogue identifier: ABZA_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 64(1991)67
Programming language: Fortran.
Computer: FACOM-M780.
Operating system: OSIV/F4 MSP.
RAM: 187K words
Word size: 32
Peripherals: disc.
Keywords: Particle physics, Elementary, Qcd, Perturbative qcd, Jets in e+e- Annihilation, Parton shower, Monte carlo simulation.
Classification: 11.5.

Nature of problem:
For the study of jets in high energy reactions, a Monte-Carlo event generator of QCD is indispensable. In order to determine the QCD fundamental parameter, i.e., the strong coupling constant, the parton- shower method including next-to-leading order terms is required.

Solution method:
Based on the formulation of QCD parton shower beyond the leading order, all terms up to the next-to-leading order are implemented into NLLjet. Detailed discussion on kinematics of parton shower is presented in this paper.

Running time:
On FACOM-M780, NLLjet generates 120 events/s of parton shower for W= 91 GeV and Qo**2 = 1GeV**2. When it is linked with the LUND6.3 hadronization model with a set of typical parameters, 24 hadronic events are generated per second.