期刊
PHYSICS LETTERS B
卷 513, 期 3-4, 页码 330-336出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0370-2693(01)00481-6
关键词
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We discuss a necessary nonvalence contribution in timelike exclusive processes. Following a Schwinger-Dyson type of approach, we relate the nonvalence contribution to an ordinary light-front wave function that has been extensively tested in the spacelike exclusive processes. A complicate four-body energy denominator is exactly cancelled in summing the light-front time-ordered amplitudes. Applying our method to K-l3 and D-0 --> K(-)l(+)nu (l) where a rather substantial nonvalence contribution is expected, we find not only an improvement in comparing with the experimental data but also a covariance (i.e., frame-independence) of existing light-front constituent quark model. (C) 2001 Elsevier Science B.V. All rights reserved.
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