Spin alignment of leading K*(892)0 mesons in hadronic Z0 decays

The OPAL Collaboration

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


Helicity density matrix elements for inclusive K*(892)0 mesons from hadronic Z0 decays have been measured over the full range of K*0 momentum using data taken with the OPAL experiment at LEP. A preference for occupation of the helicity zero state is observed at all scaled momentum xp values above 0.3, with the matrix element ρ00 rising to 0.66 ± 0.11 for xp > 0.7. The values of the real part of the off-diagonal element ρ1-1 are negative at large xp, with a weighted average value of -0.09 ± 0.03 for xp > 0.3, in agreement with new theoretical predictions based on Standard Model parameters and coherent fragmentation of the qq system from the Z0 decay. All other helicity density matrix elements measured are consistent with zero over the entire xp range. The K*0 fragmentation function has also been measured and the total rate determined to be 0.74 ± 0.02 ± 0.02 K*(892)0 mesons per hadronic Z0 decay.

Original languageEnglish
Pages (from-to)210-224
Number of pages15
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number1-2
StatePublished - 23 Oct 1997
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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