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Off-diagonal helicity density matrix elements for vector mesons produced in polarized \(e^+e^-\) processes

  • M. Anselmino
  • M. Bertini
  • F. Caruso
  • F. Murgia
  • P. Quintairos
Theoretical physics

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.

Keywords

Matrix Element Density Matrix Opal Data Vector Meson Density Matrix Element 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1999

Authors and Affiliations

  • M. Anselmino
    • 1
  • M. Bertini
    • 2
  • F. Caruso
    • 3
  • F. Murgia
    • 4
  • P. Quintairos
    • 5
  1. 1.Dipartimento di Fisica Teorica, Università di Torino and INFN, Sezione di Torino, Via P. Giuria 1, 10125 Torino, Italy IT
  2. 2.Theoretical Physics, Lund University, Sölvegatan 14a, 223 62 Lund, Sweden SE
  3. 3.Centro Brasileiro de Pesquisas Físicas, R. Dr. Xavier Sigaud 150, 22290-180 Rio de Janeiro, Brazil BR
  4. 4.INFN, Sezione di Cagliari and Dipartimento di Fisica, Università di Cagliari, C.P. 170, 09042 Monserrato (CA), Italy IT
  5. 5.Instituto de Física Teórica – UNESP, Rua Pamplona 145, 01405-900 São Paulo, Brazil BR

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