Study of Electron-Positron Collisions at Center-of-Mass Energies of 27.4 and 27.7 GeV at PETRA
Year: 1979
Type: article
Abstract: This paper reports on the first results of the study of ${e}^{+}{e}^{\ensuremath{-}}$ collisions at $\sqrt{s}=27.4$ GeV and $\sqrt{s}=27.7$ GeV at PETRA, using the $4\ensuremath{\pi}$-sr electromagnetic and calorimetric detector MARK-J. We obtain an average $R=\frac{\ensuremath{\sigma}({e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\mathrm{hadrons})}{\ensuremath{\sigma}({e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}})}=3.8\ifmmode\pm\else\textpm\fi{}0.3 (\mathrm{statistical})\ifmmode\pm\else\textpm\fi{}0.6 (\mathrm{systematic})$ and a relative $R=1.0\ifmmode\pm\else\textpm\fi{}0.2$ between the two energies. The $R$ values, the measured thrust distribution, and average spherocity show no evidence for the production of new quark flavors.
Source: Physical Review Letters
Authors: D. P. Barber, U. Becker, H. Benda, A. Boehm, J. G. Branson, J. Bron, D. Buikman, J. Burger, C. C. Chang, M. Chen, C. P. Cheng, Y. S. Chu, R. Clare, P. Duinker, H. Fesefeldt, D. Fong, M. Fukushima, G. Herten, M. C. Ho, H. K. Hsu, T. T. Hsu, R. W. Kadel, W. Krenz, D. Luckey, C. M. Ma, G. G. G. Massaro, T. Matsuda, H. Newman, J. Paradiso, F. P. Poschmann, J. P. Revol, M. Rohde, H. Rykaczewski, K. Sinram, H. W. Tang, Samuel C. C. Ting, K. L. Tung, F. Vannucci, M. White, T. W. Wu, P. C. Yang
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W1995814728