ISSN:
1434-6052
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01571395
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