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Logarithmically Enhanced Corrections to the Decay Rate and Forward Backward Asymmetry in $\bar{B} \to X_s \ell^+ \ell^-$

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 $\bar{B} \to X_s \ell^+ \ell^-$. As expected, the relative effect of these corrections...

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Detalles Bibliográficos
Autores principales: Huber, Tobias, Hurth, Tobias, Lunghi, Enrico
Lenguaje:eng
Publicado: 2007
Materias:
Acceso en línea:https://dx.doi.org/10.1016/j.nuclphysb.2008.04.028
http://cds.cern.ch/record/1076473
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author Huber, Tobias
Hurth, Tobias
Lunghi, Enrico
author_facet Huber, Tobias
Hurth, Tobias
Lunghi, Enrico
author_sort Huber, Tobias
collection CERN
description 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 $\bar{B} \to X_s \ell^+ \ell^-$. 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 $(q_0^2)_{\mu\mu} = (3.50 \pm 0.12) \gev^2$. For the high dilepton invariant mass region, we have ${\cal B}(\bar B\to X_s\mu\mu)_{\rm high} = (2.40^{+0.69}_{-0.62}) \times 10^{-7}$. The dominant uncertainty is due to the $1/m_b$ corrections and can be significantly reduced in the future. For the low dilepton invariant mass region, we confirm previous results up to small corrections.
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institution Organización Europea para la Investigación Nuclear
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spelling cern-10764732019-09-30T06:29:59Zdoi:10.1016/j.nuclphysb.2008.04.028http://cds.cern.ch/record/1076473engHuber, TobiasHurth, TobiasLunghi, EnricoLogarithmically Enhanced Corrections to the Decay Rate and Forward Backward Asymmetry in $\bar{B} \to X_s \ell^+ \ell^-$Particle Physics - PhenomenologyWe 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 $\bar{B} \to X_s \ell^+ \ell^-$. 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 $(q_0^2)_{\mu\mu} = (3.50 \pm 0.12) \gev^2$. For the high dilepton invariant mass region, we have ${\cal B}(\bar B\to X_s\mu\mu)_{\rm high} = (2.40^{+0.69}_{-0.62}) \times 10^{-7}$. The dominant uncertainty is due to the $1/m_b$ corrections and can be significantly reduced in the future. For the low dilepton invariant mass region, we confirm previous results up to small corrections.arXiv:0712.3009CERN-PH-TH-2007-177SLAC-PUB-12859ZU-TH-30-07FERMILAB-PUB-07-639-TPITHA-07-21oai:cds.cern.ch:10764732007-12-19
spellingShingle Particle Physics - Phenomenology
Huber, Tobias
Hurth, Tobias
Lunghi, Enrico
Logarithmically Enhanced Corrections to the Decay Rate and Forward Backward Asymmetry in $\bar{B} \to X_s \ell^+ \ell^-$
title Logarithmically Enhanced Corrections to the Decay Rate and Forward Backward Asymmetry in $\bar{B} \to X_s \ell^+ \ell^-$
title_full Logarithmically Enhanced Corrections to the Decay Rate and Forward Backward Asymmetry in $\bar{B} \to X_s \ell^+ \ell^-$
title_fullStr Logarithmically Enhanced Corrections to the Decay Rate and Forward Backward Asymmetry in $\bar{B} \to X_s \ell^+ \ell^-$
title_full_unstemmed Logarithmically Enhanced Corrections to the Decay Rate and Forward Backward Asymmetry in $\bar{B} \to X_s \ell^+ \ell^-$
title_short Logarithmically Enhanced Corrections to the Decay Rate and Forward Backward Asymmetry in $\bar{B} \to X_s \ell^+ \ell^-$
title_sort logarithmically enhanced corrections to the decay rate and forward backward asymmetry in $\bar{b} \to x_s \ell^+ \ell^-$
topic Particle Physics - Phenomenology
url https://dx.doi.org/10.1016/j.nuclphysb.2008.04.028
http://cds.cern.ch/record/1076473
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