Abstract.
Final-state \(q \bar q\) interactions give origin to nonzero values of the off-diagonal element \(\rho_{1,-1}\) of the helicity density matrix of vector mesons produced in \(e^+ e^-\) annihilations, as has been confirmed by recent OPAL data on \(\phi\), \(D^*\), and \(K^*\). New predictions are given for \(\rho_{1,-1}\) of several mesons produced at large \(x_{_\mathrm{E}}\) and small \(p_\mathrm{T}\)– i.e., collinear with the parent jet – in the annihilation of polarized \(e^+\) and \(e^-\); the results depend strongly on the elementary dynamics and allow further nontrivial tests of the standard model.
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Received: 2 April 1999 / Revised version: 2 July 1999 / Published online: 22 October 1999
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Anselmino, M., Bertini, M., Caruso, F. et al. Off-diagonal helicity density matrix elements for vector mesons produced in polarized \(e^+e^-\) processes. Eur. Phys. J. C 11, 529–537 (1999). https://doi.org/10.1007/s100529900200
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DOI: https://doi.org/10.1007/s100529900200