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

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dc.creatorThe OPAL Collaboration
dc.creatoral, K. Ackerstaff et
dc.date1997-08-16
dc.date.accessioned2026-07-07T11:46:48Z
dc.date.available2026-07-07T11:46:48Z
dc.descriptionHelicity density matrix elements for inclusive K*(892)^0 mesons from hadronic Z^0 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 x_p values above 0.3, with the matrix element rho_00 rising to 0.66 +/- 0.11 for x_p > 0.7. The values of the real part of the off-diagonal element rho_1-1 are negative at large x_p, with a weighted average value of -0.09 +/- 0.03 for x_p > 0.3, in agreement with new theoretical predictions based on Standard Model parameters and coherent fragmentation of the qq(bar) system from the Z^0 decay. All other helicity density matrix elements measured are consistent with zero over the entire x_p 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 Z^0 decay.
dc.description19 pages, LaTeX, uses a4p.sty, pennames.sty, 4 eps figures included, submitted to Phys. Lett. B
dc.identifierhttps://arxiv.org/abs/hep-ex/9708022
dc.identifierhttp://arxiv.org/abs/hep-ex/9708022
dc.identifierPhys.Lett.B412:210-224,1997
dc.identifierdoi:10.1016/S0370-2693(97)01077-0
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/202354
dc.subjectHigh Energy Physics - Experiment
dc.titleSpin alignment of leading K*(892)^0 mesons in hadronic Z^0 decays
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