ON THE VALUE OF R=GAMMA(H) GAMMA(L) AT LEP

Citation
M. Consoli et F. Ferroni, ON THE VALUE OF R=GAMMA(H) GAMMA(L) AT LEP, Physics letters. Section B, 349(3), 1995, pp. 375-378
Citations number
7
Categorie Soggetti
Physics
Journal title
ISSN journal
03702693
Volume
349
Issue
3
Year of publication
1995
Pages
375 - 378
Database
ISI
SICI code
0370-2693(1995)349:3<375:OTVORG>2.0.ZU;2-N
Abstract
We show that the present experimental LEP average R=Gamma(h)/Gamma(l)= 20.795+/-0.040 is not unambiguous due to the presence of substantial s ystematic effects which cannot be interpreted within gaussian statisti cs. We find by Monte Carlo simulation that the C.L. of the original LE P sample is only 3.8 . 10(-4). We suggest that a reliable estimate of the true R-value is 20.60 < R < 20.98 which produces only a very poor determination of the strong coupling constant at the Z mass scale,0.10 < alpha(s)(M(z)) < 0.15.