Phys. Rev. Lett. 79, 4083 - 4087 (1997)
Search for Light Gluinos via the Spontaneous Appearance of π+π- Pairs with an 800 GeV/c Proton Beam at Fermilab
J. Adams et al. (KTeV Collaboration)
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J. Adams11, A. Alavi-Harati12, I. F. Albuquerque10, T. Alexopoulos12, M. Arenton11, K. Arisaka2, S. Averitte10, A. R. Barker5, L. Bellantoni7, A. Bellavance9, J. Belz10, R. Ben-David7, E. Blucher4, G. J. Bock7, C. Bown4, J. D. Bricker10, S. Bright4, E. Cheu1, S. Childress7, R. Coleman7, M. D. Corcoran9, G. Corti11, B. Cox11, M. B. Crisler7, A. R. Erwin12, R. Ford7, G. Graham4, J. Graham4, K. Hagan11, E. Halkiadakis10, K. Hanagaki8, S. Hidaka8, V. Jejer11, J. Jennings2, D. A. Jensen7, P. Johnson7, R. Kessler4, H. G. E. Kobrak3, J. LaDue5, A. Lath10, A. Ledovskoy11, A. P. McManus11, P. Mikelsons5, E. Monnier4, T. Nakaya7, U. Nauenberg5, K. S. Nelson11, H. Nguyen7, V. O'Dell7, M. Pang7, R. Pordes7, V. Prasad4, C. Qiao4, B. Quinn4, E. Ramberg7, R. E. Ray7, A. Ronzhin7, A. Roodman4, M. Sadamoto8, S. Schnetzer10, K. Senyo8, P. Shanahan7, P. Shawhan4, W. Slater2, N. Solomey4, S. V. Somalwar10, R. L. Stone10, E. C. Swallow4,6, R. A. Swanson3, R. J. Tesarek10, G. B. Thomson10, R. Tschirhart7, Y. W. Wah4, H. B. White7, J. Whitmore7, B. Winstein4, R. Winston4, J.-Y. Wu5, T. Yamanaka8, and E. D. Zimmerman4 (KTeV Collaboration)
1University of Arizona, Tucson, Arizona 85721
2University of California at Los Angeles, Los Angeles, California 90095
3University of California at San Diego, La Jolla, California 92093
4The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637
5University of Colorado, Boulder, Colorado 80309
6Elmhurst College, Elmhurst, Illinois 60126
7Fermi National Accelerator Laboratory, Batavia, Illinois 60510
8Osaka University, Toyonaka, Osaka 560 Japan
9Rice University, Houston, Texas 77005
10Rutgers University, Piscataway, New Jersey 08855
11University of Virginia, Charlottesville, Virginia 22901
12University of Wisconsin, Madison, Wisconsin 53706
Received 18 July 1997
We searched for the appearance of π+π- pairs with invariant mass ≥648 MeV/c2 in a neutral beam. Such an observation could signify the decay of a long-lived light neutral particle. We find no evidence for this decay. Our null result severely constrains the existence of an R0 hadron, which is the lightest bound state of a gluon and a light gluino (gg̃), and thereby also the existence of a light gluino. Depending on the photino mass, we exclude the R0 in the mass and lifetime ranges of 1.2–4.6 GeV/c2 and 2×10-10–7×10-4 s, respectively.
©1997 The American Physical Society
URL: http://link.aps.org/abstract/PRL/v79/p4083
DOI: 10.1103/PhysRevLett.79.4083
PACS: 13.85.Rm, 13.25.Es, 14.40.Aq, 14.80.Ly
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