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Anomalous low mass e/sup +/e/sup -/ pair production in 17 GeV/c. pi. /sup -/p collisions

Description: An experiment was performed at the Multiparticle Spectrometer using 17 GeV/c ..pi../sup -/ from the BNL AGS, triggering upon inclusive e/sup +/e/sup -/ production. Electron identification was based on two transition radiator detectors and lead-scintillator shower detectors. Good acceptance for the e/sup +/e/sup -/ pair covered the region x/sub F/ > 0.3 for all p/sub T/ and pair masses. Charged particles and photons associated with the e/sup +/e/sup -/ pair are detected over a large solid ang… more
Date: January 1, 1980
Creator: Abshire, G; Adams, M & Brown, C
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Partner: UNT Libraries Government Documents Department
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N and. delta. resonances: an experimental review

Description: Experimental progress in N and ..delta.. resonances since the Oxford baryon conference is reviewed. The review concentrates on hadronic channels, and on developments of the last one or two years. The topics reviewed include the antiproton lifetime; the ..delta../sup + +/ magnetic moment; measurements of ..pi..N elastic and charge-exchange scattering in the ..delta.. region, the eta n threshold region, and the high-mass region; partial wave analyses of ..pi..N ..-->.. ..pi..N; measurements of tw… more
Date: July 1, 1980
Creator: Kelly, R.L.
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Partner: UNT Libraries Government Documents Department
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Search for narrow states produced in the reaction. pi. /sup -/p. -->. n +. gamma. 's at 13 GeV/c

Description: A double arm lead-glass lead-scintillator calorimeter system was used to search for narrow states, such as the eta/sub c/, produced in the exclusive reactions ..pi../sup -/p ..-->.. ..gamma gamma..n, ..pi../sup -/p ..-->.. ..pi../sup 0/..gamma..n, and ..pi../sup -/p ..-->.. ..pi../sup 0/..pi../sup 0/n at 13 GeV/c. A 90% c.l. upper limit sigma.BR < 260 pb was found for ..gamma gamma.. states with masses from 2.6 to 3.1 GeV/c/sup 2/. Corresponding limits on narrow ..pi../sup 0/..gamma… more
Date: July 7, 1980
Creator: Chiang, I. H.; Johnson, R. A. & Kwan, B.
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Partner: UNT Libraries Government Documents Department
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Theory of spin dependence at very high energies. [Review, S matrix]

Description: The point of view taken is to introduce a number of topics for possible discussion during the course of this workshop. Some of the theoretical expectations for polarization phenomena are reviewed assuming that hadrons are composite. Polarization phenomena are considered from an S-matrix point of view.
Date: January 1, 1977
Creator: Thomas, G. H.
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Partner: UNT Libraries Government Documents Department
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Production of. gamma. ,. pi. /sup 0/ and eta at large transverse momenta

Description: A measurement of direct photon production, as well as of ..pi../sup 0/ and eta meson production, has been performed at Fermilab. Data were taken for 200 GeV/c p and ..pi../sup +/ incident on Be, C and Al targets. The ratio of ..gamma../..pi../sup 0/ inclusive cross sections is presented for transverse momenta between 2 and 5 GeV/c.
Date: January 1, 1982
Creator: Biel, J.; Bromberg, C. & Brown, B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Pion-induced scattering above the 3,3 resonance

Description: Results of Gluaber model calculations of elastic, inelastic, single- and double-charge exchange reactions from light nuclei of pions having energy of 300 to 1200 MeV are presented. Experimental {pi}N phase shifts including {ell}=0 through 5 were used in the calculation. 25 refs., 6 figs.
Date: January 1, 1991
Creator: Oset, E. (Valencia Univ. (Spain)) & Strottman, D. (Los Alamos National Lab., NM (United States))
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Partner: UNT Libraries Government Documents Department
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Measurement of the doubly differential cross section for. pi. /sup -/p. -->. pi. /sup +/. pi. /sup -/n near threshold

Description: The doubly differential cross sections for the ..pi../sup +/ from the reaction ..pi../sup -/p ..-->.. ..pi../sup +/..pi../sup -/n were measured at about twenty points for each of five energies between 245 MeV and 356 MeV. The experiment was carried out at the Clinton P. Anderson Meson Physics Facility, where a double focusing magnetic spectrometer detected the ..pi../sup +/ mesons produced in a liquid hydrogen target. The measurements were normalized by comparison with ..pi../sup -/p elastic sc… more
Date: May 1, 1980
Creator: Walter, J.B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Search for narrow anti pp states in the reaction. pi. /sup -/p. -->. p. pi. /sup -/ anti pp at 16 GeV/c

Description: A sensitive (greater than or equal to 5 events/nb) search for narrow anti pp states was carried out at the BNL Multiparticle Spectrometer. No evidence of narrow anti pp states was found at 2020 and 2200 MeV in the reaction ..pi../sup -/p ..-->.. p..pi../sup -/ anti pp at 16 GeV/c. 2 sigma upper limits of less than or equal to 3 nb are quoted for these states in the data. Based on the cross sections of the CERN ..cap omega.. experiment at 12 GeV/c and assuming baryon-exchange processes for th… more
Date: 1980~
Creator: Chung, S. U.; Etkin, A. & Fernow, R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Informal Technical Progress Report and Budget for Incremental Funding

Description: The principal activities during the last year were related to LAMPF experiments, a newly initiated radiochemical search for Glashow particles, and the writing up of experimental work completed at FERMILAB studying the interaction of 400-MeV protons and 150-MeV pions with complex nuclei. Collaboration is proceeding with Los Alamos on heavy methanes as atmospheric tracers and in proposing a geological search for enhanced solar neutrinos in past geological times.
Date: March 25, 1982
Creator: Turkevich, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Measurement of the analyzing power for pion proton elastic scattering between 471 and 687 MeV/c

Description: The analyzing power, A/sub N/, has been measured for ..pi../sup + -/p..--> pi../sup + -/p at 471, 547, 625, and 687 MeV/c in an angular range corresponding to -0.9 less than or equal to cos theta/sub cm/ less than or equal to 0.8. A polarized proton target with polarization axis normal to the scattering plane was used. The scattered pion and recoil proton were detected in coincidence, using a magnetic spectrometer and a wire chamber/scintillator array, except in cases where one of the particles… more
Date: June 1, 1985
Creator: Mokhtari-Amirmajdi, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The creation of high energy densities with antimatter beams

Description: The use of antiprotons (and antideuterons) for the study of the behavior of nuclear matter at high energy density is considered. It is shown that high temperatures and high energy densities can be achieved for small volumes. Also investigated is the strangeness production in antimatter annihilation. It is found that the high rate of Lambda production seen in a recent experiment is easily understood. The Lambda and K-short rapidity distributions are also reproduced by the model considered. 11 re… more
Date: January 1, 1989
Creator: Gibbs, W.R.; Kruk, J.W. (Los Alamos National Lab., NM (USA) & Rice Univ., Houston, TX (USA). Bonner Nuclear Labs.)
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Partner: UNT Libraries Government Documents Department
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Interaction of pions and kaons with nucleons and nuclei

Description: A brief outline of hadronic reactions is given with emphasis on interactions of pions and K/sup + -/ with nucleons and nuclei. Primary consideration is given to energies less than 800 MeV. The paper is in the form of transparencies of an invited conference talk. (SDF)
Date: January 1, 1977
Creator: Dover, C. B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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pi. pi. scattering by pole extrapolation methods. [2. 67 GeV/c, angular distribution, Chew-Low and Durr-Pilkum methods, OPE model, isospin]

Description: A 25-inch hydrogen bubble chamber was used at the Lawrence Berkeley Laboratory Bevatron to produce 300,000 pictures of ..pi../sup +/p interactions at an incident momentum of the ..pi../sup +/ of 2.67 GeV/c. The 2-prong events were processed using the FSD and the FOG-CLOUDY-FAIR data reduction system. Events of the nature ..pi../sup +/p ..-->.. ..pi../sup +/p..pi../sup 0/ and ..pi../sup +/p ..-->.. ..pi../sup +/..pi../sup +/n with values of momentum transfer to the proton of -t less than or equa… more
Date: December 9, 1977
Creator: Lott, F.W. III
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Polarized target experiment at Fermilab. [Polarization, 100 GeV]

Description: Preliminary results are given for polarization measurements for ..pi../sup +/p and ..pi../sup -/p elastic scattering at 100 GeV. Results are not yet given for pp scattering also studied. It is noted that strictly speaking it is the asymmetry in the scattering off polarized protons that is measured. One relies on time-reversal invariance when this asymmetry is termed polarization. The values of the polarization are everywhere very small at this energy. These results appear to show no significant… more
Date: January 1, 1977
Creator: Chamberlain, O.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Glueballs in the reaction. pi. /sup -/p. -->. phi phi n at 22 GeV/c

Description: The current favorite candidate theory of strong interactions is Quantum Chromodynamics. In this theory, bound states of two or more gluons, called glueballs, must exist. Experimentally, the detection of glueballs (all of which are massive enough to decay quickly to ordinary q anti q hadrons) is complicated by the lack of any explicit signature. The calculation of the mass of the low-lying glueballs by lattice gauge methods and the MIT bag model at present give only a rough guide to experimental… more
Date: January 1, 1983
Creator: Love, W.A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Progress report for 1979-1980. [Duke Univ. , 1979-1980]

Description: This basically administrative report describes research in the following areas: ..pi..-neon interactions at 200 GeV; direct ..gamma.. and e/sup +/e/sup -/ pair production; studies of photon production in 16-GeV/c ..pi../sup +/-p interactions; ..gamma..-p interactions at 20 GeV; and computer and hardware development. References are given to published work. An expenditure statement is included. (RWR)
Date: September 16, 1980
Creator: Walker, W. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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delta. -nucleus interactions. CTP No. 887

Description: The theoretical description of pion-nucleus interactions, specifically in the intermediate-energy region dominated ..delta..-excitation, is discussed. Attention is focused on the interaction with and propagation through the nucleus of pions and ..delta..'s. The approach followed basically consists of viewing the ..delta..-nucleus system, formed by pion excitation of a nucleon, as a doorway for the pion-nucleus reaction. Analysis of the interacting ..delta..-nucleus system then leads to new dyna… more
Date: October 1, 1980
Creator: Moniz, E.J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Opening address (for the International Conference on Hadron Spectroscopy)

Description: Some historical perspective and comments are presented on some aspects of the present state of the field of hadron interactions and its potential future. Included in the discussion are the results of pion-nucleon cross sections measurements of the 1950's, the ''double pole'' of the A2 (which later was found to be wrong), and the local gauge invariant SU(3)/sub color/ and QCD. 9 refs., 9 figs. (LEW)
Date: January 1, 1985
Creator: Lindenbaum, S. J.
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Partner: UNT Libraries Government Documents Department
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A perspective on lepton-photon physics

Description: This paper reviews some key experiments of the past in which the same basic physical processes are attacked both through lepton-photon interaction and by using hadron machines as primary tools. Not surprisingly, it is concluded that the basic distinction between lepton-photon physics and elementary particle physics in general is unreal but that the tools and methodology can be very different indeed. A look is then taken into the expected future evolution of particle accelerators. Existing accel… more
Date: November 1, 1989
Creator: Panofsky, W.K.H.
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Partner: UNT Libraries Government Documents Department
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Glueballs of QCD and beyond

Description: There are two methods discussed by which glueballs might be found. In the first, an OZI suppressed channel with variable mass is used, such as the reaction ..pi../sup -/p ..-->.. phi phi n. The breakdown of the OZI suppression is the glueball signal. The OZI suppression is a filter letting glueballs pass while strongly rejecting conventional hadronic states. The other method is to look in a channel enriched in gluons such as the radiative decay of the J/psi and search for new phenomena, such as… more
Date: January 1, 1984
Creator: Lindenbaum, S. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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