Effects of Final-State Interactions on Inclusive Spin-Half Baryon Production from Time-Like Photon Fragmentation |
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Authors: | Wei LU Hai-Ming HU Yong-Bin HE |
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Institution: | 1. Institute of High Energy Physics, Academia Sinica, P. O. Box 918(4), Beijing 100039, China;
2. CCAST (World Laboratory), P. O. Box 8730, Beijing 100080, China;
3. Department of Physics, Peking University, Beijing 100871, China |
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Abstract: | In contrast to the hadronic tensor in the deeply inelastic scattering, we find that owing to the final-state interactions, time reversal invariance cannot make any constraint to the general expression of the photon fragmentation tensor for inclusive spin-half bafyon production. Correspondingly, there exists a novel fragmentation structure function F(z, Q2) that has no correspondence to any hadronic structure functions in the hadronic tensor of the deeply inelastic electron scattering off the spin-half baryon. Phenomenologically, F(z, Q2) determines the transverse polarization of the inclusively detected baryon in unpolarized electron-positron annihilation. In relation to the large transverse A polarization puzzle in fixed-target experiments, we suggest measuring the Λ polarization in e- + e+ → Λ + X . |
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