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Hi, using the variations suggested by Riccardo (+-100% on resonant and +-30% on non-resonant) I got -4.3% +3.1% as systematics. The 35-40% of this systematics is due to the non-resonant component. Symmetrizing, the systematic uncertainty is +-3.7% Daniele p.s. I assumed correlation 1 between resonant and nonresonant component variation in order to be more conservative On Wed, 26 Mar 2003, Riccardo Faccini wrote: > Hi, > here is the result of my investigation in the references of my thesis. > > The ssbar popping parameter is, in jetset, parj(2) and is also known as > gamma_s. > > It has been measured by TASSO and JADE at center of mass energies between > 12 and 36 GeV: > > > A DETAILED STUDY OF STRANGE PARTICLE PRODUCTION IN E+ E- ANNIHILATION AT > HIGH-ENERGY. > By TASSO Collaboration (M. Althoff et al.). DESY-84-093, Sep 1984. 34pp. > Published in Z.Phys.C27:27,1985 > > > CHARGED PARTICLE AND NEUTRAL KAON PRODUCTION IN E+ E- ANNIHILATION AT > PETRA. > By JADE Collaboration (W. Bartel et al.). DESY 83/042, Jun 1983. 50pp. > Published in Z.Phys.C20:187,1983 > > > The paper from Jade has also a plot (18a) which shows the extrapolation of > the jetset model down to sqrt(S)=3GeV (i.e. a jet energy -equivalent > to Mx - down to 1.5 GeV) compared with the data from MARK I > > K0 PRODUCTION IN E+ E- ANNIHILATION. > By V. Luth et al. > SLAC-PUB-1947, LBL-6465, Jun 1977. 14pp. > Published in Phys.Lett.B70:120,1977 > > The scaling seems to be ok down to our energies. > > The results of the two papers are > > gamma_s=0.35+/-0.05 Tasso > gamma_s=0.27+/-0.06 Jade > > To account for extrapolation errors I would take as 1 sigma interval the > sum of the two intervals, gamma_s=0.21-0.40, i.e. a 30% error on this > parameter. > > > So the suggestion is to do the systematic error on ss~ popping varying by > 100% the resonant component and by 30% the non resonant one > ciao > ric > >