Work

Appraising constrained second-order power corrections in HQET with Λ b → Λ c l ν

Year: 2025

Type: article

Abstract: We derive the Λ b → Λ c form factors for the Standard Model and beyond at second order in heavy quark effective theory, applying the recently proposed residual chiral expansion to reduce the set of unknown subsubleading hadronic functions to a single, highly constrained function, that is fully determined by hadron mass parameters at zero recoil. We fit a form factor parametrization based on these results to all available lattice QCD predictions and experimental data. We find that the constrained and predictive structure of the form factors under the residual chiral expansion is in excellent agreement with lattice QCD predictions and experimental data, as well as prior heavy-quark-effective-theory-based fits.

Source: Physical review. D/Physical review. D.

DOI: 10.1103/physrevd.111.036001

Authors: Florian U. Bernlochner, Michele Papucci, Dean J. Robinson

Institutions: University of Bonn, California Institute of Technology, Lawrence Berkeley National Laboratory, University of California, Berkeley

Language: English

Topic: Quantum Chromodynamics and Particle Interactions

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid