arXiv subjects

Andreas Juettner

Publications and source records attributed to Andreas Juettner.

3 recordsLinked to original sources

arXiv2021

Form factors for semileptonic $B\toπ$, $B_s\to K$ and $B_s\to D_s$ decays

We report on our determinations of $B\to π\ellν$, $B_s\to K \ell ν$ and $B_s\to D_s \ell ν$ semileptonic form factors. In addition we discuss the determination of $R$-ratios testing lepton-flavor universality and suggest an improved ratio. Our calculations are based on the set of 2+1 flavor domain-wall Iwasaki gauge field configurations generated by the RBC/UKQCD collaboration with three lattice spacings of $1/a = 1.78$, $2.38$, and $2.79\,\text{GeV}$. We use the relativistic heavy quark action for $b$ quarks and charm quarks are simulated with the Möbius domain-wall fermion action.

hep-lat↗

arXiv2015

Towards the physical point hadronic vacuum polarisation from Moebius DWF

We present steps towards the computation of the leading-order hadronic contribution to the muon anomalous magnetic moment on RBC/UKQCD physical point DWF ensembles. We discuss several methods for controlling and reducing uncertainties associated to the determination of the HVP form factor.

hep-lat↗

arXiv2003

A precise determination of the decay constant of the Ds-meson in quenched QCD

We present a lattice determination of the leptonic decay constant F_Ds of the Ds-meson using its mass and F_K as experimental input. Setting the scale with F_K=160 MeV, our final result is F_Ds = 252(9) MeV. The error contains all uncertainties apart from the quenched approximation. Setting the scale with the nucleon mass instead leads to an increase of 3(1) MeV of the leptonic decay constant which might indicate a small quenching error.

hep-lat↗