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BOHRINGER 1980B

Bohringer, T.; Costantini, F.; Dobbins, J.; Franzini, P.; Han, K.; Herb, S.W.; Kaplan, D.M.; Lederman, L.M.; Mageras, G.; Peterson, D.; Rice, E.; Yoh, J.K.; Finocchiaro, G.; Lee-Franzini, J.; Giannini, G.; Schamberger, R.D.; Sivertz, M.; Spencer, L.J.; Tuts, P.M.;
Observation of Υ, Υ^' and Υ^'' at the Cornell Electron Storage Ring
Phys. Rev. Lett. 44 (1980) 1111;

Reprinted in
The Physical Review - the First Hundred Years, AIP Press (1995) 924.

Abstracts
The Υ, Υ^', and Υ^'' states have been observed at the Cornell Electron Storage Ring as narrow peaks in σ(e⁺ e^– → hadrons) versus beam energy. Data were collected during a run with integrated luminosity of 1000 nb^-1, using the Columbia University-Stony Brook segmented NaI detector. The measured mass differences are M(Υ^')-M(Υ) = 559 ± 1 (± 3) MeV and M(Υ^'')-M(Υ) = 889 ± 1 (± 5) MeV, where the errors in parentheses represent systematic uncertainties. Preliminary values for the leptonic width ratios were also obtained.

Accelerator CESR Detectors CUSB

Related references
See also
E. Eichten et al., Phys. Rev. D21 (1980) 203;
E. Eichten et al., Phys. Rev. D17 (1978) 3090;
C. Quigg and J. L. Rosner, Phys. Lett. 71B (1977) 153;
G. Bhanot and S. Rudaz, Phys. Lett. 78B (1978) 119;
Analyse data from
C. W. Darden et al., Phys. Lett. 76B (1978) 246;
C. W. Darden et al., Phys. Lett. 78B (1978) 364;
F. H. Heimlich et al., Phys. Lett. 86B (1979) 399;
K. Ueno et al., Phys. Rev. Lett. 42 (1979) 486;
D. Andrews et al., Phys. Rev. Lett. 44 (1980) 1108;
C. Berger et al., Phys. Lett. 78B (1978) 176;
C. Berger et al., Phys. Lett. 76B (1978) 243;
W. R. Innes et al., Phys. Rev. Lett. 39 (1977) 1240;
S. W. Herb et al., Phys. Rev. Lett. 39 (1977) 252;
J. K. Bienlein et al., Phys. Lett. 78B (1978) 360;

Reactions

	e+ e– hadron (hadrons)	9.4-10.4 GeV (Ecm)	mass
	e+ e– Υ(1S)
	e+ e– Υ(2S)
	e+ e– Υ(3S)

Particles studied

	Υ(1S)	mass, pw
	Υ(2S)	mass, pw
	Υ(3S)	mass, pw
	b	qn

Record comments
Another confirmation of the Υ(3S).

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