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Hard quark-quark scattering with exclusive reactions [electronic resource].

Published:
Upton, N.Y. : Brookhaven National Laboratory, 1984.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:
Pages: 10 : digital, PDF file
Additional Creators:
Brookhaven National Laboratory and United States. Department of Energy. Office of Scientific and Technical Information
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Summary:
We have begun a program designed to study hard quark-quark scattering with exclusive reactions, focusing on quasi-elastic two-body reactions with all possible quark flavor exchanges. Examples are ..pi../sup -/p ..-->.. ..pi../sup -/p, rho/sup -/p, ..pi../sup +/..delta../sup -/, K/sup +/..sigma../sup -/, or K..lambda... Of the two-body exclusives, only elastic scattering had been measured at such large t previous to our experiment. By comparing the relative importance of different final states, the energy dependence of the production ratios of these states, the prominence of resonances such as rho/sup -/ over background in this region, and measuring polarizations where accessible, we have collected a large body of data on hard scattering in a completely new domain. Previously, essential all short distance QCD tests have been for inclusive processes. We have taken data with both negative and positive incident beam at 10 GeV/c on a hydrogen target and will present the first results, for ..pi../sup -/p ..-->.. ..pi../sup -/p and rho/sup -/p at THETA/sub cm/ = 90/sup 0/, -t = 9 GeV/sup 2//c/sup 2/. The apparatus consists of a magnetic spectrometer, with Cerenkov particle identification, which selects stable charged particles (protons in this case) at high momentum near 90/sup 0/ in the center-of-mass. A large aperture array of PWCs observes the recoil particle or charged decay products. Cross sections are extremely low, approximately a 1 nb/(GeV/c)/sup 2/ for elastic scattering. We will report on a sample of more than 1000 ..pi../sup -/p elastic events, and on rho/sup -/p, where the rho/sup -/ decay distribution was observed. We find a surprisingly large rho/sup -/p cross section in this large momentum transfer region, with rho/sup -/p about half the elastic cross section, and a striking spin alignment of the rho/sup -/.
Report Numbers:
E 1.99:bnl-34932
E 1.99: conf-840757-3
conf-840757-3
bnl-34932
Subject(s):
Other Subject(s):
Note:
Published through SciTech Connect.
07/19/1984.
"bnl-34932"
" conf-840757-3"
"DE84014375"
22. international conference on high energy physics, Leipzig, German D.R., 19 Jul 1984.
Barton, D.S.; Carroll, A.S.; Bunce, G.M.; Makdisi, Y.I.; Marshak, M.L.; Blazey, G.C.; Heller, K.J.; Baller, B.; Courant, H.; Heppelmann, S.
Funding Information:
AC02-76CH00016
View MARC record | catkey: 14716032