Coherent versus incoherent quark fragmentation picture |
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Authors: | M Anselmino P Kroll B Pire |
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Institution: | 1. Indiana University, 47401, Bloomington, IN, USA 2. University of Wuppertal, D-5600, Wuppertal, Federal Republic of Germany 3. CERN, CH-1211, Geneve 23, Switzerland
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Abstract: | We study the helicity density matrix of vector mesons produced ine + e ? interactions at high energies through the two step process \(e^ + e^ - \to q\bar q \to VX\) . Whereas in the usual incoherent fragmentation picture in which each quark decays independently, ρ(V) is predicted to be diagonal, we find that final state interactions (coherent fragmentation) give rise to a non-vanishing ρ1-1(V). Various corrections to the standard picture such as, e.g., gluon bremsstrahlung, quark masses, transverse momenta, are shown to be small. Therefore, any significant non-zero value of ρ1-1(V) found experimentally can be considered as a clear measurement of coherence effects. |
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