Abstract
We present the first preliminary results for the semileptonic form factor hA1 (w = 1)/ρAj at zero recoil for the B → D*lv decay using lattice QCD with four flavors of sea quarks. We use the HISQ staggered action for the light valence and sea quarks (the MILC HISQ configurations), and the Oktay-Kronfeld (OK) action for the heavy valence quarks.
Highlights
The 4.1σ tension between recently updated values of the exclusive and inclusive |Vcb| [1, 2], and the 4.0σ tension between the standard model prediction of εK using the exclusive |Vcb| determined with lattice QCD inputs and the experimental value of εK [2] motivates highter precision lattice calculations of |Vcb|.At present, the largest error in exclusive |Vcb| comes from the about 1% heavy quark discretization error in the Fermilab action used in current calculations [3]
The largest error in exclusive |Vcb| comes from the about 1% heavy quark discretization error in the Fermilab action used in current calculations [3]
We present the first results on the semileptonic form factor hA1 (w = 1)/ρAj at zero recoil for the B → D∗ νdecay
Summary
The 4.1σ tension between recently updated values of the exclusive and inclusive |Vcb| [1, 2], and the 4.0σ tension between the standard model prediction of εK using the exclusive |Vcb| determined with lattice QCD inputs and the experimental value of εK [2] motivates highter precision lattice calculations of |Vcb|. The largest error in exclusive |Vcb| comes from the about 1% heavy quark discretization error in the Fermilab action used in current calculations [3]. In case of the Fermilab action, the coefficients of the dimension 5 counter terms added for improvement are independent of m0. It is straight-forward to determine κcrit by fitting the pion spectra with respect to am0. 3. Determine the OK action coefficients using κcrit and measure 2-point pion correlators with point sources and sinks. X pseudoscalar vector spin-average κc (a fπ+ ) 0.048349(35)(9)(4) 0.048338(62)(11)(0) 0.048341(51)(10)(1)
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