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    TH Meeting on Particle Physics Phenomenology

    Calculating hadronic matrix elements of exclusive B decays in QCD

    by Alexander KHODJAMIRIAN (CERN-TH)

    → Europe/Zurich
    TH Auditorium (CERN)

    TH Auditorium

    CERN
    Description
    I will explain how the hadronic amplitudes of various exclusive B decays are calculated in the framework of QCD light-cone sum rules. This approximate analytical method allows to take into account both nonperturbative (soft) and perturbative (hard) contributions within one and the same framework. The already known applications of light-cone sum rules include heavy-to-light form factors, such as the B -> p form factor. The result is used to extract |Vub| from the measured B -> p l n width. I will also describe a new method allowing to calculate hadronic matrix elements of nonleptonic B decays from light-cone sum rules. Among the first results, the nonperturbative 1/m b corrections to the factorization approximation are estimated for the phenomenologically very important B -> pp channel.