Zeitschrift für Physik C

ISSN: 0170-9739 (printed version)
ISSN: 1431-5858 (electronic version)

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Abstract Volume 73 Issue 1 (1996) pp 61-72

Measurement of inclusive K$^{*0}$(892), $\phi$(1020) and K$_2^{*0}$(1430) production in hadronic Z decays

DELPHI Collaboration , P. Abreu et al. (21)

(21) LIP, IST, FCUL - Av. Elias Garcia, 14-1°, P-1000 Lisboa Codex, Portugal

Received: 24 June 1996

Abstract. The inclusive production of the neutral vector mesons K$^{*0}$(892) and $\phi(1020)$, and of the tensor meson K$^{*0}_2$(1430), in hadronic decays of the Z has been measured by the DELPHI detector at LEP. The average production rates per hadronic Z decay have been determined to be $0.77 \pm 0.08$ K$^{*0}$(892), $0.104 \pm 0.008$ $\phi(1020)$ and $0.079 \pm 0.040$ K$^{*0}_2$(1430). The ratio of the tensor-to-vector meson production yields, $\langle {\rm K}^{*0}_2(1430) \rangle/\langle {\rm K}^{*0}(892) \rangle = 0.10 \pm 0.05$, is smaller than the $\langle f_2(1270) \rangle/\langle \rho^0(770) \rangle$ and $\langle f^{'}_2(1525) \rangle$ $/\langle \phi(1020) \rangle $ ratios measured by DELPHI. The production rates and differential cross sections are compared with the predictions of JETSET 7.4 tuned to the DELPHI data and of HERWIG 5.8. The K$^{*0}$(892) and $\phi(1020)$ data are compatible with model predictions, but a large disagreement is observed for the K$^{*0}_2$(1430).

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