We review the physics of purely leptonic decays of 7π^±, K^±, D±, Ds±, and B± pseudoscalar mesons. The measured decay rates are related to the product of the relevant weak-interactionbased CK...We review the physics of purely leptonic decays of 7π^±, K^±, D±, Ds±, and B± pseudoscalar mesons. The measured decay rates are related to the product of the relevant weak-interactionbased CKM matrix element of the constituent quarks and a strong interaction parameter related to the overlap of the quark and antiquark wave-functions in the meson, called the decay constant .fp.展开更多
基金ACKNOWLEDGEMENTS We thank V. Cirigliano, C. Davies, A. El Khadra, A. Khodjamirian, J. Laiho, W. Marciano, M. Moulson, S. Narison, S. Sharpe, and Z.-G. Wang for useful discussions and references. We thank P. Boyle, M. Della Morte, D. Lin and S. Simula for providing information on the preliminary FLAG-3 lattice averages. We gratefully acknowledge support of the U. S. National Science Foundation and the U. S. Department of Energy through Grant No. DE-FG02-13ER41598. The work of J. L. R. was performed in part at the Aspen Center for Physics, which is supported by National Science Foundation grant PHY-1066293. Fermilab is operated by Fermi Research Alliance, LLC, under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy.
文摘We review the physics of purely leptonic decays of 7π^±, K^±, D±, Ds±, and B± pseudoscalar mesons. The measured decay rates are related to the product of the relevant weak-interactionbased CKM matrix element of the constituent quarks and a strong interaction parameter related to the overlap of the quark and antiquark wave-functions in the meson, called the decay constant .fp.
