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@prefix dct: <http://purl.org/dc/terms/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix vcard: <http://www.w3.org/2006/vcard/ns#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

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              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 $B_s \\to \\mu^+\\mu^-$.}
            """ ;
    dct:identifier "hal-00763339" ;
    dct:issued "2026-06-01T00:23:31.315276"^^xsd:dateTime ;
    dct:language "en" ;
    dct:modified "2026-06-01T00:23:31.315284"^^xsd:dateTime ;
    dct:publisher <https://rec.harvest-normandie.data4citizen.com/organization/cce9db95-46d9-4dc2-84b6-764215d0a002> ;
    dct:title "$|V_{ub}|$ determination in lattice QCD" ;
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            vcard:fn "CCSD" ] ;
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    dcat:keyword "infoeu-reposemanticspreprint",
        "physhlatphysics-physicshigh-energy-physics---lattice-hep-lat",
        "preprints-working-papers-" ;
    dcat:landingPage <https://hal.science/hal-00763339> .

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    dct:issued "2026-06-01T00:23:31.373923"^^xsd:dateTime ;
    dct:modified "2026-06-01T00:23:31.299007"^^xsd:dateTime ;
    dct:title "$|V_{ub}|$ determination in lattice QCD" ;
    dcat:accessURL <https://hal.science/hal-00763339> .

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