pi. /sup +/-, K/sup +/-, pp, and p-barp elastic scattering from 50 to 175 GeV/c. [Differential cross sections]

Journal Article · Wed Jun 01 00:00:00 EDT 1977 · Phys. Rev., D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.15.3105· OSTI ID:7319254

Ayres, D S; Diebold, R; Maclay, G J; Cutts, D; Lanou, Jr, R E; Levinson, L J; Massimo, J T; Litt, J; Meunier, R; Sogard, M; Gittelman, B; Loh, E C; Brenner, A E; Elias, J E; Mikenberg, G; Guerriero, L; Lavopa, P; Maggi, G; DeMarzo, C; Posa, F ; Selvaggi, G; Spinelli, P; Waldner, F; Barton, D S; Butler, J; Fines, J; Friedman, J I; Kendall, H W; Nelson, B; Rosenson, L; Verdier, R; Gottschalk, B; Anderson, R L; Gustavson, D; Rich, K; Ritson, D M; Weitsch, G A

The differential cross sections for the elastic scattering of ..pi../sup +/, ..pi../sup -/, K/sup +/, K/sup -/, p, and p-bar on protons have been measured in the t interval -0.04 to -0.75 GeV/sup 2/ at five momenta: 50, 70, 100, 140, and 175 GeV/c. The t distributions have been parametrized by the quadratic exponential form dsigma/dt = A exp( B abs. value(t) + C abs. value(t)/sup 2/ and the energy dependence has been described in terms of a single-pole Regge model. The pp and K/sup +/p diffraction peaks are found to shrink with ..cap alpha..' approx. 0.20 and approx. 0.15 GeV/sup -2/, respectively. The p-barp diffraction peak is antishrinking while ..pi../sup +/- and K/sup -/p are relatively energy-independent. Total elastic cross sections are calculated by integrating the differential cross sections. The rapid decline in sigma/sub el/ observed at low energies has stopped and all six reactions approach relatively constant values of sigma/sub el/. The ratio of sigma/sub el//sigma/sub tot/ approaches a constant value for all six reactions by 100 GeV, consistent with the predictions of the geometric-scaling hypothesis. This ratio is approx. 0.18 for pp and p-barp, and approx. 0.12--0.14 for ..pi../sup +/- and K/sup +/-. A crossover is observed between K/sup +/p and K/sup -/p scattering at abs. value t approx =0.19 GeV/sup 2/, and between pp and p-barp at abs. value t approx=0.11 GeV/sup 2/. Inversion of the cross sections into impact-parameter space shows that protons are quite transparent to mesons even in head-on collisions. The probability for a meson to pass through a proton head-on without interaction inelastically is approx. 20%, while it is only approx. 6% for an incident proton or antiproton. Finally, the results are compared with various quark-model predictions.

• Research Organization: Argonne National Laboratory, Argonne, Illinois 60439
• OSTI ID: 7319254
• Journal Information: Phys. Rev., D; (United States), Vol. 15:11
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
KAON MINUS-PROTON INTERACTIONS
ELASTIC SCATTERING
KAON PLUS-PROTON INTERACTIONS
PION MINUS-PROTON INTERACTIONS
PION PLUS-PROTON INTERACTIONS
PROTON-ANTIPROTON INTERACTIONS
PROTON-PROTON INTERACTIONS
DIFFERENTIAL CROSS SECTIONS
ENERGY DEPENDENCE
GEV RANGE 10-100
GEV RANGE 100-1000
LINEAR MOMENTUM
QUARK MODEL
REGGE POLES
SCALING LAWS
TOTAL CROSS SECTIONS
BARYON-BARYON INTERACTIONS
COMPOSITE MODELS
CROSS SECTIONS
ENERGY RANGE
GEV RANGE
HADRON-HADRON INTERACTIONS
INTERACTIONS
KAON-NUCLEON INTERACTIONS
KAON-PROTON INTERACTIONS
MATHEMATICAL MODELS
MESON-BARYON INTERACTIONS
MESON-NUCLEON INTERACTIONS
NUCLEON-ANTINUCLEON INTERACTIONS
NUCLEON-NUCLEON INTERACTIONS
PARTICLE INTERACTIONS
PARTICLE MODELS
PION-NUCLEON INTERACTIONS
PION-PROTON INTERACTIONS
PROTON-NUCLEON INTERACTIONS
SCATTERING
645103* - High Energy Physics- Particle Interactions & Properties-Experimental- Strong Interactions & Baryon & Meson Properties
645104 - High Energy Physics- Particle Interactions & Properties-Experimental- Strong Meson-Induced Interactions- (-1987)