Measurements of $SU(3)_f$ symmetry breaking in $B$ meson decay constants

De La Motte, S. A.; Zanotti, J. M.; Horsley, R.; Young, R. D.; Stüben, H.; Pleiter, D.; Jackson, P. D.; Perlt, H.; Nakamura, Y.; Schierholz, G.; Rakow, P. E. L.; Hollitt, S. E.

Preprint

PUBDB-2022-00330

Measurements of $SU(3)_f$ symmetry breaking in $B$ meson decay constants

De La Motte, S. A. (Corresponding author) ; Hollitt, S. E. (Corresponding author)Extern* ; Horsley, R. ; Jackson, P. D.Extern* ; Nakamura, Y. ; Perlt, H. ; Pleiter, D. ; Rakow, P. E. L. ; Schierholz, G.DESY* ; Stüben, H. ; Young, R. D. ; Zanotti, J. M.

2022

[10.3204/PUBDB-2022-00330]

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Please use a persistent id in citations: doi:10.3204/PUBDB-2022-00330

Report No.: ADP-22-3/T1174; DESY-22-011; LTH-1293; arXiv:2201.10779

Abstract: We present updates from QCDSF/UKQCD/CSSM on the $SU(3)_f$ breaking in $B$ meson decay constants. The $b$-quarks are generated with an anisotropic clover-improved action, and are tuned to match properties of the physical $B$ and $B^*$ mesons. Configurations are generated with $\overline{m}=(1/3)(2m_l+m_s)$ kept constant to control symmetry breaking effects. Various sources of systematic uncertainty will be discussed, including those from continuum extrapolations and extrapolations to the physical point. We also present new efforts to calculate $f_B$ and $f_{B_s}$ using weighted averages across multiple time fitting regions. The use of an automated weighted averaging technique over multiple fitting ranges allows for timely tuning of the $b$-quark and reduces the impact of systematic errors from fitting range biases in calculations of $f_B$ and $f_{B_s}$

Keyword(s): meson: decay ; time: multiple ; symmetry breaking: effect ; anisotropy ; SU(3)

Note: 15 pages, 7 figures, proceedings for The 38th International Symposium on Lattice Field Theory, LATTICE2021, 26th-30th July, 2021, Zoom/Gather@Massachusetts Institute of Technology

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