Observation of a narrow resonance formed in e+e- annihilation at 9.46 GeV

Details Observation of a narrow resonance formed in e+e- annihilation at 9.46 GeV Observation of a narrow resonance formed in e+e- annihilation at 9.46 GeV

May 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978phlb...76..243b&link_type=abstract

Physics Letters B, Volume 76, Issue 2, p. 243-245.

Physics

90

Scientific paper

An experiment using the PLUTO detector has observed the formation of a narrow, high mass, resonance in e+e- annihilations at the DORIS storage ring. The mass is determined to be 9.46+/-0.01 GeV which is consistent with that of the Upsilon. The gaussian width σ is observed as 8+/-1 MeV and is equal to the DORIS energy resolution. This suggests that the resonance is a bound state of a new heavy quark-antiquark pair. An electronic width Γee=1.3+/-0.4 keV was obtained. In standard theoretical models, this favors a quark charge assignment of 1/3.

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