Z0 Bozonu'nun hadronik bozunumunda ?±(770) mezonu ölçümü

The inclusive production rate of the charged vector meson ±(770) in hadronic Z decays is measured with the ALEPH detector at the LEP collider. A total of 3,239,746 hadronic events are selected from data recorded by ALEPH from the 1991 to 1995 running periods. Decays of ± 0 + ± are reconstructed for xE > 0.05 and xp > 0.05 where xE = E/Ebeam and xp = p/pbeam. The ± multiplicity per hadronic event is evaluated to be: = 2.59 ± 0.03 ± 0.15 ± 0.04 where the first error is statistical and the second systematic. The third error is from the extrapolation to the xp = xE =0. The rates and differential cross-section are compared with Monte Carlo model predictions and OPAL measurements. Key words: ± meson production, ALEPH, LEP, hadronic Z decays