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The differential cross-sections for the annihilation processes p p→π − π + and p p→K − K + have been measured at an incident laboratory momentum at 5 GeV/ c . Strong backward and forward peaks are observed in the π + π − differential cross-sections while the K + K − cross-section is shown to have a peak only for K − going forward. The annihilation cross-sections are compared with the cross-sections for the crossed channel backward processes π ± p→p π ± and K ± p→pK ± .

2 data tables

Table 1

No description provided.

Table 2

No description provided.

K+- p elastic scattering at 5 gev/c. evidence for a k- p backward peak

Chabaud, V. ; Eide, A. ; Lehmann, P. ; et al.

Phys.Lett.B 38 (1972) 445-448, 1972.

Inspire Record 75816 DOI 10.17182/hepdata.5729

The elastic scattering of K ± mesons on protons has been studied at 5 GeV/c. A total of about 500 000 events have been measured in the c.m. angular range 17° < θ cm < 165° corresponding to 0.2 < − t < (GeV/ c ) 2 . We observed a K − p backward peak which we have parametrized as d σ /d u = (0.6 ± 0.2) exp [(3.3 ± 0.6) u ] μb /(GeV/c) 2 , while for the K + p backward peak we find d σ /d u = (17.5 ± 1) exp [(3.6 ± 0.2) u ] μb /(GeV/c) 2 . The K − p cross-section falls to about 0.03 μ b ( GeV /c) 2 around − t = 5 (GeV/ c ) 2 , while the K + p cross-section stays in the vicinity of 0.3 μ b ( GeV /c) 2 in the same t -region. The K + p and K − p differential cross-sections have cross-over points at − t = 0.2, 1.1 and about 3.5 (GeV/ c ) 2 .

2 data tables

Table 1

No description provided.

Table 2

No description provided.

Elastic scattering of anti-protons on protons at 5 gev/c evidence for a backward peak

Chabaud, V. ; Eide, A. ; Lehmann, P. ; et al.

Phys.Lett.B 38 (1972) 449-451, 1972.

Inspire Record 75820 DOI 10.17182/hepdata.5678

Antiproton-proton elastic scattering has been measured at 5 GeV/c. A total of 30 000 events were observed in the angular range 17° < θ cm < 136°, corresponding to 0.3 < − t < 7.7 (GeV/ c 2 ). In addition to the known dip at − t = 0.5 ( GeV / c ) 2 , we observe a structure at about − t = 2 (GeV/ c ) 2 and a backward peak with a slope4.1 ± 0.6 (GeV/ c ) 2 . The extrapolated differential cross-section at u = 0 is 1.3 ± 0.8 μ b/(GeV/ c ) 2 .

2 data tables

Table 1

No description provided.

Table 2

No description provided.

Measurement of large angle pi+- p elastic scattering at 5 gev/c

Chabaud, V. ; Eide, A. ; Lehmann, P. ; et al.

Phys.Lett.B 38 (1972) 441-444, 1972.

Inspire Record 75821 DOI 10.17182/hepdata.6523

The differential cross-section for 5 GeV/ cπ + p and π − p elastic scattering have been measured in the c.m. angular region 27° < θ cm < 130° corresponding to 0.5 < | t | < 7.8 (GeV/ c ) 2 . Dips are observed in both reactions at − t = 2.8 and 4.8 (GeV/ c ) 2 where the cross-sections are approximately 0.1 μ b/(GeV/ c ) 2 .

2 data tables

Table 1

No description provided.

Table 2

No description provided.

Six-prong interactions of pi+ mesons with protons at 8 gev/c

Bardadin-Otwinowska, M. ; Hofmokl, T. ; Wojcik, W. ; et al.

Phys.Rev.D 4 (1971) 2711-2739, 1971.

Inspire Record 74762 DOI 10.17182/hepdata.3770

Final results for 3678 six-prong π+p events at 8 GeV/c are presented. Single-particle distributions are compared with the predictions of the Chan-Loskiewicz-Allison model and the phenomenological model of the F(t) function. Differences between the transverse momenta of the π+ and π− and between the transverse momenta of secondaries emitted forward and backward in the c.m. system are observed. Cross sections for production of the ρ0, ρ+, ρ−, η, ω0, X0, and D0 mesons and the N33*++ and N33*− isobars are given, together with upper limits for some other resonances. The D0 meson is observed in the seven-body channel in the ηπ+π− system, with some evidence for the cascade decay D0→δ±π∓→ηπ+π−. The branching ratio (f0→2π+2π−)(f0→2π) is determined to be (2.2−2.2+4.5)%. Upper limits for the decay of A mesons into X0π systems are quoted. The cross section for the two-body reaction π+p→N33*++X0 is determined to be 30 ± 13 μb, from which the η0−X0 mixing angle is derived. Associated production of N33*++ and ρ0 in the six-body channel and of N33*++, ρ0, and ω0 in the seven-body channel is studied, and the cross sections for reactions involving simultaneous production of these resonances are estimated. The Goldhaber-Goldhaber-Lee-Pais effect is studied and shown to be strong in the six-body channel, especially for selected events with low energy of the pion system.

73 data tables

Table 1

TOTAL NUMBER EVENTS=504. DATA FROM T 1.

Table 2

TOTAL NUMBER EVENTS=1075. DATA FROM T 1.

Table 3

TOTAL NUMBER EVENTS=425. DATA FROM T 1.

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Anti-p p backward scattering and s-channel resonances - upper limit to the anti-p p coupling of the s(1929) meson

Bizzarri, R. ; Guidoni, P. ; Marzano, F. ; et al.

Phys.Rev.D 6 (1972) 160-163, 1972.

Inspire Record 74038 DOI 10.17182/hepdata.22256

From the energy dependence of the p¯p and p¯n inelastic cross sections we deduce an upper limit to the resonant contribution in p¯p backward scattering for c.m. energies between 1915 and 1950 MeV. This limit is smaller than the expected contribution from diffraction scattering. The energy dependence of the 180° p¯p elastic cross section in this energy range cannot therefore be directly related to the formation of s-channel resonances.

1 data table

Table 1

CROSS SECTION ONLY FOR ANNIHILATION EVENTS WITH EMISSION OF SPECTATOR PROTON TOO SLOW TO GIVE A VISIBLE TRACK (LESS THAN ABOUT 80 MEV/C) - ABOUT 60 PCT OF TOTAL ANNILILATION. NUMERICAL VALUES TAKEN FROM TABLE 2 OF R. BIZZARRI ET AL., NC 22A, 225 (1974).

Elastic scattering and single-pion production in k- p interactions at 5.5 gev/c

Engelmann, R. ; Musgrave, B. ; Schweingruber, F. ; et al.

Phys.Rev.D 5 (1972) 2162-2187, 1972.

Inspire Record 74221 DOI 10.17182/hepdata.22545

We present results of an analysis of two-prong events for elastic scattering and single-pion production in K−p interactions at 5.5 GeVc. The resonance parameters for the charged and neutral K*(890) and K*(1420) are determined and the observed production and decay properties of the charged and neutral K*(890) are compared with the theoretical predictions of an absorptive one-particle-exchange model and a Regge model. The K*(1420) differential cross section and density-matrix elements are presented and the question of whether more than one resonance exists in this mass range is considered. A search for resonance effects at Kπ mass beyond 1500 MeV is made. In particular, the recently reported state at 1800 MeV is discussed. A B5-model analysis of the reaction K−p→K¯0π−p is also presented.

13 data tables

Table 1

NORMALIZED TO SIG(K- P --> ANYTHING) OF 24.3 +- 0.8 MB.

Table 2

FORWARD CROSS SECTION OPTICAL POINT FROM TWO PARAMETER EXPONENTIAL FIT OVER 0.12 < -T < 0.68 GEV**2.

Table 3

No description provided.

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Measurements of the symmetries in the differential cross sections for anti-p p ---> anti-p p and anti-p p ---> pi- pi+ using polarized protons

Ehrlich, R.D. ; Etkin, A. ; Glodis, P. ; et al.

Phys.Rev.Lett. 28 (1972) 1147-1150, 1972.

Inspire Record 75507 DOI 10.17182/hepdata.21461

We report measured asymmetries as a function of polar scattering angle for the reactions p¯p→π−π+ and p¯p→p¯p, using a polarized proton target. The annihilation data, obtained at a p¯ momentum of 1.64 GeV/c, are the first asymmetry data to be collected for this channel. A fit of these data and published differential cross section data is made by a partial-wave expansion, and the results are compared with a previous analysis. The elastic scattering data, obtained at 1.64 and 2.55 GeV/c, are fitted with an eight-parameter strong-absorption model.

1 data table

Table 1

No description provided.

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Proton compton effect in the region of the delta(1236)-resonance

Differential cross-sections for the reactions p p ---> d pi+ and p p ---> d rho+ in the energy range from 10 to 24 gev

Anti-p p annihilation into pi+ pi- and k+ k- at 5 gev/c

K+- p elastic scattering at 5 gev/c. evidence for a k- p backward peak

Elastic scattering of anti-protons on protons at 5 gev/c evidence for a backward peak

Measurement of large angle pi+- p elastic scattering at 5 gev/c

Six-prong interactions of pi+ mesons with protons at 8 gev/c

Anti-p p backward scattering and s-channel resonances - upper limit to the anti-p p coupling of the s(1929) meson

Elastic scattering and single-pion production in k- p interactions at 5.5 gev/c

Measurements of the symmetries in the differential cross sections for anti-p p ---> anti-p p and anti-p p ---> pi- pi+ using polarized protons