2007/12/31 by Tobias Huber, Tobias Hurth, Enrico Lunghi
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-ph
paper · pdf · doi:10.1016/j.nuclphysb.2008.04.028
published as Nucl.Phys.B802:40-62,2008 · 26 pages, 3 figures, minor changes, published version
openalex publication_date 2008/05/10 · arxiv created 2008/05/19 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We study logarithmically enhanced electromagnetic corrections to the decay rate in the high dilepton invariant mass region as well as corrections to the forward–backward asymmetry (FBA) of the inclusive rare decay B¯→Xsℓ+ℓ−. As expected, the relative effect of these corrections in the high dilepton mass region is around −8% for the muonic final state and therefore much larger than in the low dilepton mass region. We also present a complete phenomenological analysis, to improved NNLO accuracy, of the dilepton mass spectrum and the FBA integrated in the low dilepton mass region, including a new approach to the zero of the FBA. The latter represents one of the most precise predictions in flavour physics with a theoretical uncertainty of order 5%. We find (q02)μμ=(3.50±0.12) GeV2. For the high dilepton invariant mass region, we have B(B¯→Xsμμ)high=(2.40−0.62+0.69)×10−7. The dominant uncertainty is due to the 1/mb corrections and can be significantly reduced in the future. For the low dilepton invariant mass region, we confirm previous results up to small corrections.