New Results on the Theoretical Precision of the LEP/SLC Luminosity

Details New Results on the Theoretical Precision of the LEP/SLC Luminosity New Results on the Theoretical Precision of the LEP/SLC Luminosity

1998-11-04

arxiv.org/abs/hep-ph/9811245v3

Phys.Lett. B450 (1999) 262-266

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 3 figures, 1 table, 1998 Rochester Conference presentation, corrected Ref. 12, improved reference to Ref. 10, correct

Scientific paper

10.1016/S0370-2693(99)00104-5

We consider the error budget for the calculation of the LEP/SLC luminosity in the Monte Carlo event generator BHLUMI4.04 from the standpoint of new calculations of the exact result for the O(alpha) correction to the process e+ e- -> e+ e- + gamma in the low angle luminosity regime at SLC/LEP energies, for the double bremsstrahlung effect e+ e- -> e+ e- + gamma gamma in this regime, and for the size of the two-loop virtual correction to e+ e- -> e+ e- in this regime in context of Yennie-Frautschi-Suura exponentiation. We find that the error on the O(alpha**2) photonic correction can be reduced from the currently published value 0.1% to the value 0.027%. This leads to an over-all precision tag for the currently available program BHLUMI4.04 of 0.061%. This reduction of the precision of the calculation is important for the final LEP1 EW precision Z physics tests of the Standard Model.

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