|Vub| determination in Lattice QCD

Publication type:
Conference
Metadata:
Autoren
  • Fabio Bernardoni
DOI
10.22323/1.174.0424
Zeitschrift
Proceedings of 36th International Conference on High Energy Physics — PoS(ICHEP2012)
Name of conference
36th International Conference on High Energy Physics
Datum der Veröffentlichung
2013
Status
Published
Herausgeber
Sissa Medialab
Herausgeber URL
http://dx.doi.org/10.22323/1.174.0424
Datum der Datenerfassung
2018
Conference start date
2012
Titel
|Vub| determination in Lattice QCD

Data source: Crossref

Other metadata sources:
Abstract
The 2012 PDG reports a tension at the level of $3 \sigma$ between two exclusive determinations of $|V_{ub}|$. They are obtained by combining the experimental branching ratios of $B \to \tau \nu$ and $B \to \pi l \nu$ (respectively) with a theoretical computation of the hadronic matrix elements $\fB$ and the $B \to \pi$ form factor $f_+(q^2)$. To understand the tension, improved precision and a careful analysis of the systematics involved are necessary. We report the results of the ALPHA collaboration for $\fB$ from the lattice with 2 flavors of $O(a)$ improved Wilson fermions. We employ HQET, including $1/m_b$ corrections, with pion masses ranging down to $\approx$ 190 MeV. Renormalization and matching were performed non-perturbatively, and three lattice spacings reaching $a^{-1}\approx 4.1$ GeV are used in the continuum extrapolation. We also present progress towards a computation of $f_+(q^2)$, to directly compare two independent exclusive determinations of $|V_{ub}|$ with each other and with inclusive determinations. Additionally, we report on preliminary results for $\fBq{s}$, needed for the analysis of $B_s \to \mu^+\mu^-$.}
Autoren
  • F Bahr
  • F Bernardoni
  • B Blossier
  • J Bulava
  • M Della Morte
  • P Fritzsch
  • N Garron
  • A Gérardin
  • J Heitger
  • G von Hippel
  • A Ramos
  • H Simma
  • R Sommer
Autoren-URL
http://arxiv.org/abs/1211.6327v1
Schlüsselwörter
  • hep-lat
  • hep-lat
Datum der Veröffentlichung
2012
Datum der Datenerfassung
2012
Datum, an dem der Datensatz öffentlich gemacht wurde
2012
Titel
$|V_{ub}|$ determination in lattice QCD

Files

1211.6327v1.pdf

Data source: arXiv

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