NNLO leptonic and hadronic corrections to Bhabha scattering and luminosity monitoring at meson factories
Abstract
Virtual fermionic N f = 1 and N f = 2 contributions to Bhabha scattering are combined with realistic real corrections at next-to-next-to-leading order in QED. The virtual corrections are determined by the package bha_nnlo_hf, and real corrections with the Monte Carlo generators B hagen-1P h, H elac-P hegas and E khara. Numerical results are discussed at the energies of and with realistic cuts used at the Φ factory DANE, at the B factories PEP-II and KEK, and at the charm/τ factory BEPC II. We compare these complete calculations with the approximate ones realized in the generator B abaY aga@NLO used at meson factories to evaluate their luminosities. For realistic reference event selections we find agreement for the NNLO leptonic and hadronic corrections within 0.07% or better and conclude that they are well accounted for in the generator by comparison with the present experimental accuracy.
- Publication:
-
Journal of High Energy Physics
- Pub Date:
- July 2011
- DOI:
- 10.1007/JHEP07(2011)126
- arXiv:
- arXiv:1106.3178
- Bibcode:
- 2011JHEP...07..126C
- Keywords:
-
- NLO Computations;
- Electromagnetic Processes and Properties;
- High Energy Physics - Phenomenology;
- High Energy Physics - Experiment
- E-Print:
- 38 pages, 12 figures, 13 tables