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Article type: Cover
1979 Volume 58 Issue Suppl Pages
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Article type: Appendix
1979 Volume 58 Issue Suppl Pages
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Article type: Appendix
1979 Volume 58 Issue Suppl Pages
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Article type: Appendix
1979 Volume 58 Issue Suppl Pages
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Article type: Appendix
1979 Volume 58 Issue Suppl Pages
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Article type: Index
1979 Volume 58 Issue Suppl Pages
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Article type: Appendix
1979 Volume 58 Issue Suppl Pages
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M. G. Albrow, S. Almehed, P. S. L. Booth, X. de Bouard, H. Boggild, L. ...
Article type: Article
1979 Volume 58 Issue Suppl Pages
2-21
Published: March 20, 1979
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J. A. Chinellato, P. L. Christiano, C. Dobrigkeit, J. B. Filho, C. M. ...
Article type: Article
1979 Volume 58 Issue Suppl Pages
22-46
Published: March 20, 1979
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Cosmic-ray-induced nuclear interactions are observed by emulsion chambers exposed on Mt. Chacaltaya, Bolivia (5,200m above sea level). Photons from nuclear interactions are detected and measured which occurred within the petroleum pitch layer (1/3 nuclear mean free path), set 150 cm above the emulsion chamber. Photons of energy ≳ 100 GeV are detected in each event, the highest detected photon energy being 40 TeV. 350 events are found to contain 4 or more photons, whose energy sums, ΣE_γ, range from 5 TeV up to 500 TeV (corresponding E_0 estimates being 20 → 3000 TeV), and are adopted for detailed analysis. The highest detected photon p_T is 2.5 GeV/c. Multiplicity-, energy-, angular-, p_T-, and other related distributions of the photons are presented, comparison is made with the accelerator data, and some discussions are given.
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M. Hama, M. Nagasaki
Article type: Article
1979 Volume 58 Issue Suppl Pages
47-54
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L. Stodolsky
Article type: Article
1979 Volume 58 Issue Suppl Pages
55-60
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Takeo MATSUOKA
Article type: Article
1979 Volume 58 Issue Suppl Pages
61-70
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Edmond L. Berger
Article type: Article
1979 Volume 58 Issue Suppl Pages
71-121
Published: March 20, 1979
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A review is presented of theoretical attempts to describe the massive lepton pair continuum produced in hadronic collisions. I begin with the classical Drell-Yan quark-antiquark annihilation model. Its expectations are compared with data. Scaling violations and corrections to the Drell-Yan pictured are discussed. Next, I present original work bearing on the understanding of the transverse momentum distributions of the dileptons. In a parton model, the quark-gluon scattering graphs which provide scaling violations also endow the dileptons with relatively large <p_T>. Comparisons with available data support these QCD expectations; further tests of the QCD predictions are proposed. Implications are drawn for W production experiments, and predictions are presented for reactions initiated by antiprotons.
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Kisei KINOSHITA
Article type: Article
1979 Volume 58 Issue Suppl Pages
122-128
Published: March 20, 1979
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K. SCHILLING
Article type: Article
1979 Volume 58 Issue Suppl Pages
129-138
Published: March 20, 1979
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We evaluate finite size effects for two-particle correlations from fireball decay, treating quantum statistics correctly. The results compare favourably with central pion production as observed in a 205 GeV/c pp bubble chamber experiment.
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M. Biyajima, O. Miyamura, T. Nakai
Article type: Article
1979 Volume 58 Issue Suppl Pages
139-145
Published: March 20, 1979
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Recently Fowler and Weiner have pointed out that the coherent hadron emission, in addition to chaotic emission, is playing important role in Bose-Einstein correlation experiment. Such contribution would give a considerable influence to a fire ball picture of Kopylov-Podgoretsky and Cocconi(KPC). Following Fowler and Weiner, we are analyzing two and three identical pion distributions in terms of superposed chaotic and coherent emission model. Here that chaotic part is described by the KPC formula is assumed. The dependences of two and three particle correlation functions on the magnitude of coherent part and the coherent length are discussed.
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Atsushi NAKAMURA, Mikio NAMIKI
Article type: Article
1979 Volume 58 Issue Suppl Pages
146-155
Published: March 20, 1979
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Hiroyuki SUMIYOSHI
Article type: Article
1979 Volume 58 Issue Suppl Pages
156-164
Published: March 20, 1979
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Akira MINAKA
Article type: Article
1979 Volume 58 Issue Suppl Pages
165-171
Published: March 20, 1979
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Fujio TAKAGI
Article type: Article
1979 Volume 58 Issue Suppl Pages
172-176
Published: March 20, 1979
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S. DATE, I. HASHIZUME, A. NAKAMURA, I. OHBA, N. SUZUKI
Article type: Article
1979 Volume 58 Issue Suppl Pages
177-184
Published: March 20, 1979
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Leading proton spectra on Be, Al, Cu and Pb targets at 24 GeV/c and Be target at 200 GeV/c are analyzed in terms of the intranuclear cascade model. The model can well describe the data at 24 GeV/c. At 200 GeV/c, however, the attenuation of the leading particle in nuclei seems to be very low.
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Shigeaki HIRABAYASHI, Keizo KOBAYAKAWA, Toshiyuki MORII
Article type: Article
1979 Volume 58 Issue Suppl Pages
185-197
Published: March 20, 1979
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A modified cascade model for hadron-nucleus collisions is proposed. The reaction probability (r(y)) is introduced with which the produced hadron in the first inelastic interaction is able to collide subsequently. The Monte Carlo computation is three-dimensionally carried out by using the appropriate inclusive spectra and energy dependence of multiplicities in hadron-nucleon collisions. The inclusive pseudo-rapidity spectra of shower particles are compared in detail for p-Em reaction at 200 GeV/c and the data are in good agreement with the prediction when r(y) is linearly dependent on the rapidity, y. For the inclusive spectra and the multiplicities, the dependence on the incident energy and the atomic number of the target is compared with data. The results are satisfactory. The following points are made clear: The contribution of Fermi motion is small and almost negligible. The three-dimensional treatment shows the significant difference with that of one-dimension for the inclusive spectra, especially at low pseudo-rapidities.
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N. SUZUKI, S. SUZUKI
Article type: Article
1979 Volume 58 Issue Suppl Pages
198-207
Published: March 20, 1979
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Single particle distributions and two particle correlations in hadron-nucleus collisions are analysed in the cluster cascade model. The model is compatible with the experimental data under the condition that cluster-nucleon cross section is 11 mb and cluster decay charged multiplicity is about 1.5.
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K. Zalewski
Article type: Article
1979 Volume 58 Issue Suppl Pages
208-216
Published: March 20, 1979
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The conjecture of Koplik and Mueller concerning space-time picture of double scattering is supported by a calculation. The results are compared with those obtained from old fashioned perturbation theory.
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S. KITAKADO
Article type: Article
1979 Volume 58 Issue Suppl Pages
217-232
Published: March 20, 1979
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The idea of planar duality for describing mesons is extended to systems containing baryons and baryonium states. For this we introduce an ansatz that one of the three constituent quarks of a baryon always behaves as a spectator at B^^-BM vertices. The resulting baryon can then be visualized as two active quarks at the ends of a string and a remaining inactive quark sitting in the middle. This we call the linear baryon.
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Ichiro OHBA
Article type: Article
1979 Volume 58 Issue Suppl Pages
233-243
Published: March 20, 1979
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The measured large value of Δσ_L for pp scattering must be interpreted as a violation of strong exchange degeneracy(SEXD) of A_1 and Z. A SEXD violating A_1-Z contribution to Im U_0 provides a fine representation of Δσ_L for p_L ≥ 3 GeV/c. The Legendre coefficients of this amplitude draw the loops on the Argand diagram. We discuss a similarity between the top positions of them and the possible dibaryon resonances, and a duality scheme due to lowlying trajectories.
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H. Fukuda, C. Iso
Article type: Article
1979 Volume 58 Issue Suppl Pages
244-259
Published: March 20, 1979
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Using the new type of quark cascade model where the recombination of quarks into a hadron in the final step is taken into account in the diffusion equation (with three parameters and one unified vertex function), the following small and large momentum transfer phenomena are analized successfully in a unified way; the inclusive spectra of the forward hadron-hadron collision, pp → π^± X, K^±X, pX and Δ^<++> X and πp→π^±X and K^±X etc., the single particle invariant cross section at 90°, the x_<//> dependence of the single particle cross section at fixed energy and large transverse momentum, beam ratios, the charge particle distribution in the hemisphere opposite to a large P_T trigger π^0, and the associated possitive forward particle with high P_T charged trigger particle.
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E. H. de Groot, J. Engels
Article type: Article
1979 Volume 58 Issue Suppl Pages
260-280
Published: March 20, 1979
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A covariant generalization of the one-dimensional cascade model for quark fragmentation functions is presented, so as to include the transverse momentum behaviour and the possibility to produce different particles at different vertices along the chain. In the scaling limit the exact solution is given, if the primordial function is of the type αz^<α-1.> T(p_T). For the more general case of factorizing primordial functions an analytic expression for the seagull effect is derived, which turns out to be independent of the function T(p_T).
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Takeshi KANKI
Article type: Article
1979 Volume 58 Issue Suppl Pages
281-288
Published: March 20, 1979
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P. Hoyer, J. Kwiecinski
Article type: Article
1979 Volume 58 Issue Suppl Pages
289-296
Published: March 20, 1979
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The high energy behaviour of a double discontinuity of the six-point amplitude is studied in the dual resonance model and in a hybrid Feynman diagram model. This discontinuity imposes, through unitarity, a bound on the intercept of the bare Pomeron singularity. It is shown that in both models the ordinary Regge trajectories which couple to two-body amplitudes decouple from the discontinuity. The origin of this decoupling is discussed. The asymptotic behaviour of the double discontinuity is controlled by sister trajectories in the dual resonance model, and by the genuine three particle Regge poles in a Feynman diagram model. Insofar as the intercepts of these trajectories are lower than those of the usual Regge poles there is no strong constraint on the Pomeron.
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Hisakazu MINAKATA
Article type: Article
1979 Volume 58 Issue Suppl Pages
297-303
Published: March 20, 1979
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I summarize the results of my recent investigation of trajectory slopes from the QCD-inspired multi-jet view of hadronic final states.
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K. KANAI
Article type: Article
1979 Volume 58 Issue Suppl Pages
304-314
Published: March 20, 1979
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Inclusive pseudoscalar and vector meson distributions in the meson fragmentation region are analyzed based on universal quark jet hypothesis and valence quark approximation. Adding the particle distributions produced by diffraction dissociation, we are able to fit the data successfully both in shape and normalization. For the fragmentation function, we use the parametrization by Field and Feynman.
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Hujio NODA
Article type: Article
1979 Volume 58 Issue Suppl Pages
315-321
Published: March 20, 1979
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A simple treatment of hadron fragmentation processes in hadron-hadron collisions at high energies is formulated in the framework of (i) the valence quark model of hadrons, (ii) cascade mechanism of hadron production and (iii) subsequent decay of unstable particles into stable hadrons. The meson case is discussed. The data of π^+ fragmentation in π^+p collision at P_L = 16GeV/c are analyzed.
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B. R. WEBBER
Article type: Article
1979 Volume 58 Issue Suppl Pages
322-340
Published: March 20, 1979
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Developments in the 't Hooft two-dimensional QCD model for hadronic interactions are reviewed.
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K. KONISHI
Article type: Article
1979 Volume 58 Issue Suppl Pages
341-356
Published: March 20, 1979
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We review recent developments in the application of QCD perturbation theory to hard processes, with some emphasis on a simple algorithm and its application to multiparticle spectra inside QCD jets.
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Article type: Appendix
1979 Volume 58 Issue Suppl Pages
357-358
Published: March 20, 1979
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Article type: Appendix
1979 Volume 58 Issue Suppl Pages
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Article type: Cover
1979 Volume 58 Issue Suppl Pages
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