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Published February 1, 2025 | Version Published
Journal Article Open

Appraising constrained second-order power corrections in HQET with Λb→Λclν

Creators

  • 1. ROR icon University of Bonn
  • 2. ROR icon California Institute of Technology
  • 3. ROR icon Lawrence Berkeley National Laboratory

Abstract

We derive the Λb→Λc 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. Published by the American Physical Society 2025

Copyright and License

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

Acknowledgement

We thank Zoltan Ligeti for many insightful discussions and comments on the manuscript. F. B. is supported by DFG Emmy-Noether Grant No. BE 6075/1-1 and BMBF Grant No. 05H21PDKBA. D. J. R. is supported by the Office of High Energy Physics of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. M. P. is supported by the U.S. Department of Energy, Office of High Energy Physics, under Grant Award No. DE-SC0011632 and by the Walter Burke Institute for Theoretical Physics.

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Additional details

Funding

Deutsche Forschungsgemeinschaft
BE 6075/1-1
Federal Ministry of Education and Research
05H21PDKBA
Office of High Energy Physics
DE-AC02-05CH11231
Office of High Energy Physics
DE-SC0011632
California Institute of Technology
Walter Burke Institute for Theoretical Physics -

Dates

Accepted
2024-10-17
Accepted
Available
2025-02-03
Published online

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Caltech groups
Walter Burke Institute for Theoretical Physics
Publication Status
Published