TY - JOUR

T1 - Form factors for Λb → Λ transitions from lattice QCD

AU - Detmold, William

AU - Lin, C. J.David

AU - Meinel, Stefan

AU - Wingate, Matthew

N1 - Funding Information:
Acknowledgments: This work is supported by the U.S. Department of Energy under cooperative research agreement Contract Number DE-FG02-94ER40818. Numerical computations were performed using resources at NERSC (funded by DOE grant number DE-AC02-05CH11231) and XSEDE resources at NICS (funded by NSF grant number OCI-1053575).

PY - 2012

Y1 - 2012

N2 - The rare baryonic decays Lb Lm+m and Lb Lg can complement rare B meson decays in constraining models of new physics. In this work, we calculate the relevant Lb-L transition form factors at leading order in heavy-quark effective theory using lattice QCD. Our analysis is based on RBC/UKQCD gauge field ensembles with 2+1 flavors of domain-wall fermions, and with lattice spacings of a-0:11 fm and a-0:08 fm. We compute appropriate ratios of three-point and two-point correlation functions for a wide range of source-sink separations, and extrapolate to infinite separation in order to eliminate excited-state contamination. We then extrapolate the form factors to the continuum limit and to the physical values of the light-quark masses.

AB - The rare baryonic decays Lb Lm+m and Lb Lg can complement rare B meson decays in constraining models of new physics. In this work, we calculate the relevant Lb-L transition form factors at leading order in heavy-quark effective theory using lattice QCD. Our analysis is based on RBC/UKQCD gauge field ensembles with 2+1 flavors of domain-wall fermions, and with lattice spacings of a-0:11 fm and a-0:08 fm. We compute appropriate ratios of three-point and two-point correlation functions for a wide range of source-sink separations, and extrapolate to infinite separation in order to eliminate excited-state contamination. We then extrapolate the form factors to the continuum limit and to the physical values of the light-quark masses.

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M3 - Conference article

AN - SCOPUS:85030107077

SN - 1824-8039

VL - Part F130497

JO - Proceedings of Science

JF - Proceedings of Science

M1 - 106

T2 - 30th International Symposium on Lattice Field Theory, Lattice 2012

Y2 - 24 June 2012 through 29 June 2012

ER -