Phys. Rev. Lett.
86,
4773–4777
(2001)
Observation of Color-Transparency in Diffractive Dissociation of Pions
E. M. Aitala et al. (Fermilab E791 Collaboration)
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E. M. Aitala9, S. Amato1, J. C. Anjos1, J. A. Appel5, D. Ashery14, S. Banerjee5, I. Bediaga1, G. Blaylock8, S. B. Bracker15, P. R. Burchat13, R. A. Burnstein6, T. Carter5, H. S. Carvalho1, N. K. Copty12, L. M. Cremaldi9, C. Darling18, K. Denisenko5, S. Devmal3, A. Fernandez11, G. F. Fox12, P. Gagnon2, S. Gerzon14, C. Gobel1, K. Gounder9, A. M. Halling5, G. Herrera4, G. Hurvits14, C. James5, P. A. Kasper6, S. Kwan5, D. C. Langs12, J. Leslie2, J. Lichtenstadt14, B. Lundberg5, S. MayTal-Beck14, B. Meadows3, J. R. T. de Mello Neto1, D. Mihalcea7, R. H. Milburn16, J. M. de Miranda1, A. Napier16, A. Nguyen7, A. B. d'Oliveira3,11, K. O'Shaughnessy2, K. C. Peng6, L. P. Perera3, M. V. Purohit12, B. Quinn9, S. Radeztsky17, A. Rafatian9, N. W. Reay7, J. J. Reidy9, A. C. dos Reis1, H. A. Rubin6, D. A. Sanders9, A. K. S. Santha3, A. F. S. Santoro1, A. J. Schwartz3, M. Sheaff17, R. A. Sidwell7, A. J. Slaughter18, M. D. Sokoloff3, J. Solano1, N. R. Stanton7, R. J. Stefanski5, K. Stenson17, D. J. Summers9, S. Takach18, K. Thorne5, A. K. Tripathi7, S. Watanabe17, R. Weiss-Babai14, J. Wiener10, N. Witchey7, E. Wolin18, S. M. Yang7, D. Yi9, S. Yoshida7, R. Zaliznyak13, and C. Zhang7 (Fermilab E791 Collaboration)
1Centro Brasileiro de Pesquisas Físicas, Rio de Janeiro, Brazil
2University of California, Santa Cruz, California 95064
3University of Cincinnati, Cincinnati, Ohio 45221
4CINVESTAV, Mexico City, Mexico
5Fermilab, Batavia, Illinois 60510
6Illinois Institute of Technology, Chicago, Illinois 60616
7Kansas State University, Manhattan, Kansas 66506
8University of Massachusetts, Amherst, Massachusetts 01003
9University of Mississippi-Oxford, University, Mississippi 38677
10Princeton University, Princeton, New Jersey 08544
11Universidad Autonoma de Puebla, Puebla, Mexico
12University of South Carolina, Columbia, South Carolina 29208
13Stanford University, Stanford, California 94305
14Tel Aviv University, Tel Aviv, Israel
15Box 1290, Enderby, British Columbia, Canada VOE 1V0
16Tufts University, Medford, Massachusetts 02155
17University of Wisconsin, Madison, Wisconsin 53706
18Yale University, New Haven, Connecticut 06511
Received 18 October 2000; published in the issue dated 21 May 2001
We have studied the diffractive dissociation into dijets of 500GeV/c pions scattering coherently from carbon and platinum targets. Extrapolating to asymptotically high energies (where tmin→0), we find that when the per-nucleus cross section for this process is parametrized as σ = σ0Aα, α has values near 1.6, the exact result depending on jet transverse momentum. These values are in agreement with those predicted by theoretical calculations of color-transparency.
© 2001 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.86.4773
DOI:
10.1103/PhysRevLett.86.4773
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