Fickinger, W.J.
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pi--p Interactions at 604 MeV

Vittitoe, C.N. ; Riley, B.R. ; Fickinger, W.J. ; et al.
Phys.Rev. 135 (1964) B232-B240, 1964.
Inspire Record 46855 DOI 10.17182/hepdata.594

The interactions of 604 MeV π− mesons in a hydrogen bubble chamber have been systematically analyzed. In 33 000 pictures a total of 8052 usable events were found, corresponding to cross sections of 18.9±1.3 mb for σ(elastic), 4.98±0.54 mb for σ(π−pπ0), 7.87±0.91 mb for σ(π−nπ+), 14.0±1.0 mb for σ(neutrals), with σ(two−pionproduction)<0.2 mb, for a total cross section of 45.9±1.9 mb at this energy. The angular distribution for elastic scattering was fitted with a fifth-order polynomial in cosθ which gave a value of dσdΩ(0°) consistent with dispersion theory. The pion-pion effective-mass distributions for both single-pion-production channels showed pronounced peaking at high mass values, strongly inconsistent with simple isobar-production kinematics. Simple one-pion exchange does not appear to play a significant role.

2 data tables match query
Table 1

No description provided.

Table 2

No description provided.


p-p Interactions at 2 Bev. 1. Single-Pion Production

Fickinger, W.J. ; Pickup, E. ; Robinson, D.K. ; et al.
Phys.Rev. 125 (1962) 2082-2090, 1962.
Inspire Record 46669 DOI 10.17182/hepdata.26851

3600 two-pronged events, obtained in p−p interactions at 2 Bev in the BNL 20-in. hydrogen bubble chamber, have been analyzed. Cross sections have been measured for elastic scattering, for the two modes of single-pion production, p+p→p+n+π+, p+p→p+p+π0, and for strange-particle production. The branching ratio for the two one-pion production reactions is σ(pnπ+)σ(ppπ0)=4.17±0.25. Momentum distributions and Q values indicate that single-pion production proceeds almost entirely through the (32, 32) resonant state. The data have been considered in terms of the extended isobar model and also a one-pion exchange model for production. The branching ratio and momentum distributions can be explained by including a small effect from the I=12 resonant state in addition to the dominant I=32 resonance. The c.m. angular distribution of the nucleons in single-pion production shows very marked backward-forward peaking indicating a one-pion exchange mechanism. Absolute differential cross sections as a function of laboratory kinetic energy have been calculated from Selleri's equation for the pnπ+ reaction. There is good agreement with the data for low four-momentum transfers [q2<0.15(Bev/c)2], but for higher momentum transfers the theoretical cross sections are larger than the experimental cross sections.

1 data table match query
Table 1

No description provided.


STUDY OF THE REACTION P (polarized) P ---> N DELTA++ AT 6-GEV/C WITH POLARIZED BEAM

Eisner, R.L. ; Fickinger, W.J. ; Malko, J.A. ; et al.
Phys.Rev.D 20 (1979) 596-600, 1979.
Inspire Record 146629 DOI 10.17182/hepdata.24197

We have studied the reaction p↑p→nΔ++ at 6 GeV/c incident momentum in which the incident protons are 60% transversely polarized. The experiment used the Argonne National Laboratory Zero Gradient Synchrotron polarized beam and the 12-foot hydrogen bubble chamber. We report on about 6000 Δ++ events, with the Δ++ produced in the backward hemisphere in the c.m. system. Spin-density matrix elements as a function of momentum transfer are presented and small beam-polarization-induced effects are described.

4 data tables match query
Table 1

BACKWARD-PRODUCED DEL++ HAS HALF THIS CROSS SECTION.

Table 2

TWO EXPONENTIAL FITS: D(SIG)/DT HAS CHANGE OF SLOPE AT ABOUT -T OF 0.1 GEV**2.

Table 3

No description provided.

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Single and Multiple Pion Production in pi+n and pi-p Interactions at 1.7 GeV/c

Bacon, T.C. ; Fickinger, W.J. ; Hill, D.G. ; et al.
Phys.Rev. 157 (1967) 1263-1278, 1967.
Inspire Record 52416 DOI 10.17182/hepdata.26582

Meson production in π−p and π+n interactions at 1.7 GeV/c has been studied in two bubble-chamber exposures. Combined results are presented with emphasis on single-pion production (4300 events) which is dominated by the formation of the ρ0 meson in peripheral interactions, and on double-pion production (1100 events) which shows strong formation of the ω meson. These data are compared with the predictions of particle-exchange models, including absorption, and the effects of competing channels are discussed. Evidence for a two-pion decay mode of the ω is examined quantitatively. Processes with higher meson multiplicities are described.

1 data table match query
Table 1

No description provided.


Backward production of rho0 and f0 mesons in pi+ n interactions at 6 gev/c

Dado, S. ; Engler, A. ; Kraemer, R.W. ; et al.
Phys.Lett.B 50 (1974) 275-279, 1974.
Inspire Record 95262 DOI 10.17182/hepdata.27950

Backward production of ϱ 0 and f 0 mesons in π + n interactions at 6 GeV/ c is presented. Total and differential cross sections are reported along with spin density matrix elements.

5 data tables match query
Table 1

No description provided.

Table 3

JACKSON (U) FRAME (Z=2).

Table 4

HELICITY FRAME (Z=-4).

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Study of the reaction pi+ n ---> omega p at 6.0 gev/c

Anderson, J.C. ; Engler, A. ; Kraemer, R.W. ; et al.
Phys.Lett.B 45 (1973) 165-168, 1973.
Inspire Record 84780 DOI 10.17182/hepdata.28073

An analysis of the reaction π + n→ ω p in a 6.0 GeV/ c bubble chamber experiment is presented. The production differential cross section and spin density matrix elements are compared with Regge exchange models.

3 data tables match query
Table 1

CORRECTED FOR BACKGROUND.

Table 2

HELICITY FRAME. T-DEPENDENT BACKGROUND SUBTRACTED.

Table 3

TRANSVERSITY FRAME. T-DEPENDENT BACKGROUND SUBTRACTED.


SEARCH FOR THE S MESON IN ANTI-PROTON PROTON INTERACTIONS

Fickinger, W. ; Marino, R. ; Robinson, D.K. ; et al.
Phys.Rev.D 34 (1986) 3332-3342, 1986.
Inspire Record 239036 DOI 10.17182/hepdata.26472

The interaction between antiprotons and protons has been studied in the range 1910 to 1990 MeV center-of-mass energy in a drift-chamber experiment at the Brookhaven Alternating Gradient Synchrotron. The total cross section has been determined at eleven different incident momenta, and the elastic cross section between 8 and 30 deg in the laboratory has been measured with an energy resolution of about 5 MeV. The cross section for annihilation into charged mesons has also been measured, with the same resolution. There is no evidence in any of these channels for the existence of a narrow resonance.

3 data tables match query
Table 1

Data are for total sample with nuclear physics calculation as described in the paper.

Table 2

Partial elastic cross sections.

Table 3

Partial annihilation cross sections.


Inclusive $\Lambda$ and $\bar{\Lambda}$ Production in $K^+ p$ Interactions at 70-{GeV}/$c$

The Brussels-CERN-Genoa-Mons-Nijmegen-Serpukhov collaboration Barth, M. ; De Clercq, C. ; De Wolf, E.A. ; et al.
Z.Phys.C 10 (1981) 205, 1981.
Inspire Record 166163 DOI 10.17182/hepdata.2217

Inclusive and semi-inclusive production of Λ and\(\bar \Lambda\) inK+p interactions is studied at an incident momentum of 70 GeV/c. Cross sections and single particle distributions are presented and compared with data at lower energies. Scaling is observed between 32 and 70 GeV/c in the Feynmanx variable in the target and the beam fragmentation regions for Λ and\(\bar \Lambda\) inclusive production respectively. An increase of Λ (\(\bar \Lambda\)) production is observed in the beam (target) fragmentation regions, whereas the data at 70 and 32 GeV/c are reasonably close in the central region. The dependence of the Λ(\(\bar \Lambda\)) polarization as a function ofx is measured and found to be in general agreement with the results at 32 GeV/c. The (Λ\(\bar \Lambda\)) pair production cross section increases significantly from 32 to 70 GeV/c. The Λ and\(\bar \Lambda\) production associated with an identified proton is also studied.

4 data tables match query
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Cross-sections and Multiplicity Distributions for $K^+ p$ Interactions at 70-{GeV}/$c$

Barth, M. ; De Clercq, C. ; De Wolf, E. ; et al.
Z.Phys.C 2 (1979) 285, 1979.
Inspire Record 141693 DOI 10.17182/hepdata.2107

Cross sections and charged multiplicity distributions forK+p interactions at 70 GeV/c are presented and compared withK+p data at other energies. Comparisons are also made with available π+p,pp, andK−p data.

2 data tables match query
Table 1

No description provided.

Table 2

No description provided.


$\rho^0$ Production in $\pi^- p$ Interactions at 100-{GeV}/$c$, 200-{GeV}/$c$ and 360-{GeV}/$c$

Higgins, P.D. ; Shephard, W.D. ; Biswas, N.N. ; et al.
Phys.Rev.D 19 (1979) 65, 1979.
Inspire Record 7275 DOI 10.17182/hepdata.4591

Inclusive and semi-inclusive cross sections for gp0 production in 100, 200, and 360 GeV/c π−p interactions are presented. Differential cross sections for ρ0 production as functions of c.m. rapidity and transverse momentum are compared with the corresponding differential cross sections for pion production. Effects of various methods of estimating background on the values obtained for ρ0 production cross sections are discussed. About 10% of the final-state charged pions appear to come from ρ0 decay. Thus, while ρ0 production and decay is a significant source of final-state pions, other sources must contribute the majority of the produced pions.

14 data tables match query
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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