English

Forward--Backward Asymmetry in B -> X_s l^+ l^- at the NNLL Level

High Energy Physics - Phenomenology 2009-11-07 v2

Abstract

We report the results of a new calculation of soft-gluon corrections in B -> X_s l^+ l^- decays. In particular, we present the first calculation of bremsstrahlung and corresponding virtual terms to the lepton forward-backward asymmetry, which allows us to systematically include all contributions to this observable beyond the lowest non-trivial order. The new terms are important, for instance the position of the zero of the asymmetry receives corrections of O(10%). Using a different method, we also provide an independent check of recently published results on bremsstrahlung and infrared virtual corrections to the dilepton-invariant mass distribution.

Keywords

Cite

@article{arxiv.hep-ph/0208088,
  title  = {Forward--Backward Asymmetry in B -> X_s l^+ l^- at the NNLL Level},
  author = {A. Ghinculov and T. Hurth and G. Isidori and Y. -P. Yao},
  journal= {arXiv preprint arXiv:hep-ph/0208088},
  year   = {2009}
}

Comments

20 pages, 5 figures. v2: typo in (4.26) corrected; discussion on mu-dependence modified