Direct fragmentation of quarkonia including Fermi motionusing light-cone wave function
Department of Physics, Faculty of Science, Razi University, Kermanshah, Iran
2 The Center for Theoretical Physics and Mathematics, A.E.O.I., Chamran Building, P.O. Box 11365-8486, Tehran, Iran
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We investigate the effect of Fermi motion on the direct fragmentation of the and states employing a light-cone wave function. Consistent with such a wave function we set up the kinematics of a heavy quark fragmenting into quarkonia such that the Fermi motion of the constituents splits into a longitudinal as well as a transverse direction and thus calculate the fragmentation functions for these states. In the framework of our investigation, we estimate that the fragmentation probabilities of and may increase at least up to 14 percent when including this degree of freedom.
© Springer-Verlag, 2005