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ANDREWS 1980B

CLEO Collaboration; Andrews, D. et al.
Observation of a Fourth Upsilon State in e⁺ e^– Annihilations
Phys. Rev. Lett. 45 (1980) 219;

Abstracts
A fourth state in the upsilon energy region has been seen in e⁺ e^– collisions at the Cornell Electron Storage Ring. A resonance is observed with a mass 1112 ± 5 MeV above the lowest upsilon state. The 9.6 MeV rms width is greater than the 4.6 MeV energy resolution of the e⁺ e^– beams. The observed characteristics of the new state make it a likely candidate for the 4³S state of the b anti-b system, lying above the threshold for the production of B mesons.

Accelerator CESR Detectors CLEO

Related references
More (earlier) information appears in
D. Andrews et al., Phys. Rev. Lett. 44 (1980) 1108;
Analyse data from
S. W. Herb et al., Phys. Rev. Lett. 39 (1977) 252;
W. R. Innes et al., Phys. Rev. Lett. 39 (1977) 1240;
G. Finocchiaro et al., Phys. Rev. Lett. 45 (1980) 222;
C. W. Darden et al., Phys. Lett. 76B (1978) 246;
C. W. Darden et al., Phys. Lett. 78B (1978) 364;
J. K. Bienlein et al., Phys. Lett. 78B (1978) 360;
T. Bohringer et al., Phys. Rev. Lett. 44 (1980) 1111;
C. Berger et al., Phys. Lett. 76B (1978) 243;

Reactions

	e+ e– Υ(4S)	10.46-10.64 GeV (Ecm)
	Υ(4S) 2hadron (hadrons)

Particles studied

Υ(4S)

ex, mass

Record comments
Evidence for the Υ(4S).

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