8-12 September 2014
Vienna University of Technology
Europe/Vienna timezone

B-->pi form factors from Alpha collaboration

10 Sep 2014, 10:05
EI 10 lecture hall (Vienna University of Technology)

EI 10 lecture hall

Vienna University of Technology



Mr Felix Bahr (DESY Zeuthen)


We present the current status of the ongoing work of the ALPHA collaboration on the computation of the form factor $f_+ (q^2)$ for the semi-leptonic decay $\textnormal B_\textnormal s \to \textnormal K \ell \nu$. We simulate on lattices generated as part of the Coordinated Lattice Simulations (CLS) effort which have $N_\textnormal f=2$ non-perturbatively $O(a)$ improved Wilson fermions that satisfy $m_\pi L \geq 4$ and have sea pion masses down to $\approx 250 \,\textnormal{MeV}$. The heavy quark is treated in non-perturbative Heavy Quark Effective Theory (HQET). We discuss how to extract physical information from our raw measurement data and present first results in the form of a data point for the form factor at $q^2=21.23\,\textnormal{GeV}^2$ extrapolated to the continuum. We also address the inclusion of next-to-leading order terms in HQET and chiral extrapolation, which have yet to be performed.

Presentation Materials