|Vub| determination in Lattice QCD
- Publikationstyp:
- Konferenzbeitrag
- Metadaten:
-
- 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
Datenquelle: Crossref
- Andere Metadatenquellen:
-
- 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
Datenquelle: arXiv
- Beziehungen:
- Eigentum von