Phys. Rev. Lett. 39, 1240 - 1242 (1977)Observation of Structure in the ϒ Region |
W. R. Innes, J. A. Appel, B. C. Brown, C. N. Brown, K. Ueno, and T. Yamanouchi
Fermi National Accelerator Laboratory, Batavia, Illinois 60510
S. W. Herb, D. C. Hom, L. M. Lederman, J. C. Sens *, H. D. Snyder, and J. K. Yoh
Columbia University, New York, New York 10027
R. J. Fisk, A. S. Ito, H. Jöstlein, D. M. Kaplan, and R. D. Kephart
State University of New York at Stony Brook, Stony Brook, New York 11794
See Also: Erratum
Received 9 September 1977
The properties of the dimuon enhancement seen in 400-GeV proton-nucleus collisions have been clarified by a threefold increase in data. We find two peaks whose widths are consistent with our resolution: M1=9.4 GeV with B dσ / dy|y=0=1.8×10-37 cm2/nucleon and M2=10.0 GeV with B dσ / dy|y=0=0.7×10-37 cm2/nucleon. Evidence for the possible existence of a third peak near 10.4 GeV is discussed as are the comparisons with the properties of a qq̅ system, where q is a new heavy quark.
©1977 The American Physical Society
URL: http://link.aps.org/abstract/PRL/v39/p1240
DOI: 10.1103/PhysRevLett.39.1240
* Permanent address: Foundation for Fundamental Research on Matter, The Netherlands.
See Also
Erratum: W. R. Innes, J. A. Appel, B. C. Brown, C. N. Brown, K. Ueno, T. Yamanouchi, S. W. Herb, D. C. Hom, L. M. Lederman, J. C. Sens, H. D. Snyder, J. K. Yoh, R. J. Fisk, A. S. Ito, H. Jöstlein, D. M. Kaplan, and R. D. Kephart, Observation of Structure in the ϒ Region., Phys. Rev. Lett. 39, 1640 (1977)
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