Evidence for a spin-1 gluon in three-jet events
Abstract
High-energy e +e --annihilation events obtained in the TASSO detector at PETRA have been used to determine the spin of the gluon in the reaction e +e - → qqbarg. We analysed angular correlations between the three jet axes. While vector gluons are consistent with the data (55% confidence limit), scalar gluons are disfavoured by 3.8 standard deviations, corresponding to a confidence level of about 10 -4. Our conclusion is free of possible biases due to uncertainties in the fragmentation process or in determining the qqbarg kinematics from the observed hadrons.
- Publication:
-
Physics Letters B
- Pub Date:
- December 1980
- DOI:
- 10.1016/0370-2693(80)90639-5
- Bibcode:
- 1980PhLB...97..453B