Production properties of K*(892)+- vector mesons and their spin alignment as measured in the NOMAD experiment

2006
First measurements of K*(892) mesonsproduction properties and their spin alignment in nu_mu charged current(CC) and neutral current(NC) interactions are presented. The analysis of the full data sample of the NOMAD experiment is performed in different kinematic regions. For K*+ and K*- mesonsproduced in nu_mu CC interactions and decaying into K0 pi+/- we have found the following yields per event: (2.6 +/- 0.2 ( stat.) +/- 0.2 (syst.))% and (1.6 +/- 0.1 ( stat.) +/- 0.1 (syst.))% respectively, while for the K*+ and K*- mesonsproduced in nu NC interactions the corresponding yields per event are: (2.5 +/- 0.3 ( stat.) +/- 0.3 (syst.))% and (1.0 +/- 0.3 ( stat.) +/- 0.2 (syst.))%. The results obtained for the rho00 parameter, 0.40 +/- 0.06 ( stat) +/- 0.03 (syst) and 0.28 +/- 0.07 ( stat) +/- 0.03 (syst) for K*+ and K*- produced in nu_mu CC interactions, are compared to theoretical predictions tuned on LEP measurements in e+e- annihilation at the Z0 pole. For K*+ mesonsproduced in nu NC interactions the measured rho00 parameter is 0.66 +/- 0.10 ( stat) +/- 0.05 (syst).
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