Computer Physics Communications Program LibraryPrograms in Physics & Physical Chemistry |

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Manuscript Title: Upgrade of the Monte Carlo program BHLUMI for Bhabha scattering at
low angles to version 4.04. | ||

Authors: S. Jadach, W. Placzek, E. Richter-Was, B.F.L. Ward, Z. Was | ||

Program title: BHLUMI version 4.04 | ||

Catalogue identifier: ACHI_v2_0Distribution format: tar.gz | ||

Journal reference: Comput. Phys. Commun. 102(1997)229 | ||

Programming language: Fortran. | ||

Computer: IBM RS6000. | ||

Operating system: UNIX. | ||

RAM: 5M words | ||

Word size: 32 | ||

Keywords: Particle physics, Elementary, Corrections radiative, Monte carlo simulation, Bhabha scattering, Bremsstrahlung, Quantum electrodynamics, Electroweak theory, Structure functions. | ||

Classification: 11.4. | ||

Nature of problem:The small-angle Bhabha scattering process is used in all electron- positron colliders to calculate machine luminosity. This process is subject to QED radiative corrections, which have to be known for arbitrary cut-offs and/or acceptance with a precision at least a factor of 2 better than the pure experimental precision. This means that the level of 0.05% should be reached. A realistic simulation should include emission of the bremsstrahlung photons. | ||

Solution method:The Monte Carlo simulation of the small-angle process is an ideal solution. It provides the integrated cross-section for arbitrary cuts. Direct simulation of the final state electrons and photons is precisely what is needed for detector simulation purposes. | ||

Restrictions:The overall precision of the QED calculation is restricted to 0.11%, for a typical LEP/SLC luminometer angular range of 1o < theta < 3o, where theta is the scattering angle. | ||

Running time:The efficiency for multi-photon sub-generator is typically 6 million variable-weight events and 4 million constant-weight events per hour for an HP9000-735/100 MHz machine. |

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