SU(3) breaking in hyperon transition vector form factors
Name
PhysRevD.92.074029.pdf
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454.61 KB
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Checksum (MD5)
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Author(s)
Cooke, A. N.
Horsley, R.
Nakamura, Yasunobu
Rakow, P. E. L.
Schierholz, G.
Thomas, A. W.
Young, R. D.
Zanotti, J. M.
Shanahan, Phiala
Date Issued
October 2015
Journal
Physical Review D
Publisher
American Physical Society
Citation
Shanahan, P. E., A. N. Cooke, R. Horsley, Y. Nakamura, P. E. L. Rakow, G. Schierholz, A. W. Thomas, R. D. Young, J. M. Zanotti. "SU(3) breaking in hyperon transition vector form factors." Phys. Rev. D 92, 074029 (October 2015). © 2015 American Physical Society
Version
Final published version
Abstract
We present a calculation of the SU(3)-breaking corrections to the hyperon transition vector form factors to O(p[superscript 4]) in heavy-baryon chiral perturbation theory with finite-range regularization. Both octet and decuplet degrees of freedom are included. We formulate a chiral expansion at the kinematic point Q[superscript 2] = -(M[subscript B[subscript 1]]-M[subscript B[subscript 2]])[superscript 2], which can be conveniently accessed in lattice QCD. The two unknown low-energy constants at this point are constrained by lattice QCD simulation results for the Σ[superscript -] → n and Ξ[superscript 0] → Σ[superscript +] transition form factors. Hence, we determine lattice-informed values of f[subscript 1] at the physical point. This work constitutes progress toward the precise determination of |V[subscript us]| from hyperon semileptonic decays.
MIT Department
Massachusetts Institute of Technology. Center for Theoretical Physics
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.92.074029
