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Lattice calculation of form factors for B meson decays

Published on:

8 January 2024

Primary Category:

High Energy Physics - Lattice

Paper Authors:

Aurora Melis,

Francesco Sanfilippo,

Silvano Simula

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Key Details

Performed lattice QCD calculation of hadronic susceptibilities for b → c transitions

Used Nf = 2+1+1 twisted mass gauge configurations with approximately physical light quark masses

Extrapolated to physical b quark mass using meson mass data

Preliminary results indicate small nonperturbative condensate contributions

AI generated summary

Lattice calculation of form factors for B meson decays

This paper presents a lattice quantum chromodynamics determination of quantities called hadronic susceptibilities, which can be used to constrain the form factors that appear in semileptonic B meson decays like B → D(∗)lνl. Using gauge configurations that incorporate four flavors of quarks, including approximately physical up, down, strange and charm quarks, the authors evaluate susceptibilities related to vector and axial vector currents carrying bottom and charm quark quantum numbers. After extrapolating to the physical b quark mass, these quantities can be combined with unitarity and analyticity to predict the form factors' momentum transfer dependence without using models. The results suggest condensate terms are small in the method's operator product expansion.

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