Kaon distribution amplitude from lattice QCD and the flavor SU(3) symmetry

Rui Zhang; Jiunn-Wei Chen; Luchang Jin; Huey-Wen Lin; Andreas Schäfer; Peng Sun; Yi-Bo Yang; Jian-Hui Zhang; Yong Zhao

Nuclear Physics B (Feb 2019)

Kaon distribution amplitude from lattice QCD and the flavor SU(3) symmetry

Rui Zhang,
Jiunn-Wei Chen,
Luchang Jin,
Huey-Wen Lin,
Andreas Schäfer,
Peng Sun,
Yi-Bo Yang,
Jian-Hui Zhang,
Yong Zhao

Affiliations

Rui Zhang: Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA; Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China; School of Physical Sciences, University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, China
Jiunn-Wei Chen: Department of Physics, Center for Theoretical Physics, and Leung Center for Cosmology and Particle Astrophysics, National Taiwan University, Taipei, 106, Taiwan; Corresponding authors.
Luchang Jin: Physics Department, University of Connecticut, Storrs, CT 06269-3046, USA; RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, NY 11973, USA
Huey-Wen Lin: Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA; Department of Computational Mathematics, Michigan State University, East Lansing, MI 48824, USA; Corresponding authors.
Andreas Schäfer: Institut für Theoretische Physik, Universität Regensburg, D-93040 Regensburg, Germany
Peng Sun: Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA
Yi-Bo Yang: Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA; Corresponding authors.
Jian-Hui Zhang: Institut für Theoretische Physik, Universität Regensburg, D-93040 Regensburg, Germany; Corresponding authors.
Yong Zhao: Center for Theoretical Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA

Journal volume & issue: Vol. 939
pp. 429 – 446

Abstract

Read online

We present the first lattice-QCD calculation of the kaon distribution amplitude using the large-momentum effective theory (LaMET) approach. The momentum-smearing technique has been implemented to improve signals at large meson momenta. We subtract the power divergence due to Wilson line to high precision using multiple lattice spacings. The kaon structure clearly shows an asymmetry of the distribution amplitude around x=1/2, a clear sign of its skewness. Our result also prefers a broader distribution than the asymptotic form. We also study the leading SU(3) flavor symmetry breaking relations for the pion, kaon and eta meson distribution amplitudes, and the results are consistent with the prediction from chiral perturbation theory.

Published in Nuclear Physics B

ISSN: 0550-3213 (Print); 1873-1562 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Science: Physics: Nuclear and particle physics. Atomic energy. Radioactivity
Website: http://www.journals.elsevier.com/nuclear-physics-b/

About the journal