Charge Transfer in Different Final States of $\pi^- p$ Interactions at 5-{GeV}/$c$

Lebedev, R.M. ; Chadraa, B. ; Sharkhu, G. ;
Inspire Record 156930 DOI 10.17182/hepdata.39276
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Measurements of spin rotation parameter A in pion proton elastic scattering at 1.62-GeV/c

The ITEP-PNPI collaboration Alekseev, I.G. ; Budkovsky, P.E. ; Kanavets, V.P. ; et al.
Phys.Lett. B485 (2000) 32-36, 2000.
Inspire Record 526552 DOI 10.17182/hepdata.41744

The ITEP-PNPI collaboration presents the results of the measurements of the spin rotation parameter A in the elastic scattering of positive and negative pions on protons at P_beam = 1.62 GeV/c. The setup included a longitudinally-polarized proton target with superconductive magnet, multiwire spark chambers and a carbon polarimeter with thick filter. Results are compared to the predictions of partial wave analyses. The experiment was performed at the ITEP proton synchrotron, Moscow.

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Budkovsky, P.E. ; Dobrov, V.M. ; Zhurkin, V.V. ; et al.
Conference Paper, 1985.
Inspire Record 214097 DOI 10.17182/hepdata.40129
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Bekrenev, V.S. ; Gaditsky, V.G. ; Kovalev, A.I. ; et al.
Pisma Zh.Eksp.Teor.Fiz. 31 (1980) 197-201, 1980.
Inspire Record 157168 DOI 10.17182/hepdata.16995
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The SIGMA-AYaKS & Dubna-Serpukhov-Tbilisi collaborations Antipov, Yu.M. ; Batarin, V.A. ; Bezzubov, V.A. ; et al.
Sov.J.Nucl.Phys. 48 (1988) 85, 1988.
Inspire Record 253399 DOI 10.17182/hepdata.38881
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Asymmetry in $\pi^- P$ (Polarized) Elastic Scattering in Momentum Range 1.4-{GeV}/c - 2.1-{GeV}/c

Alekseev, I.G. ; Budkovsky, P.E. ; Kanavets, V.P. ; et al.
Nucl.Phys. B348 (1991) 257-275, 1991.
Inspire Record 285067 DOI 10.17182/hepdata.33071
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Recoil-proton polarization in π$^−$ -p elastic scattering at 365 MeV

Dickinson, D.F. ; Helland, J.A. ; Perez-Mendez, V. ;
Phys.Lett. 20 (1966) 549-551, 1966.
Inspire Record 923108 DOI 10.17182/hepdata.69224

The polarization of the recoil proton at this energy depends on the interference of the P 33 phase shift with the P 11 and S 11 phase shifts. The measured values indicate the existence of a large P 11 phase shift. The polarization was measured by scattering from carbon blocks in spark chambers using a Vidicon scanner to record the data.

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Measurement of the Spin Rotation Parameters R and A in pi- p Elastic Scattering at Energy 450 MeV

Bekrenev, V.S. ;
Inspire Record 1395704 DOI 10.17182/hepdata.37961
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Measurement of the spin rotation parameters R and A in pi- p elastic scattering at 450-MeV and 560-MeV

Abaev, V.V. ; Bazhanov, N.A. ; Bekrenev, V.S. ; et al.
Sov.J.Nucl.Phys. 48 (1988) 852-858, 1988.
Inspire Record 457307 DOI 10.17182/hepdata.17344
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Hard exclusive hadron nucleon scattering and color transparency

Heppelmann, S. ; Wu, J.Y. ; Appel, R. ; et al.
Nucl.Phys. A527 (1991) 581C-583C, 1991.
Inspire Record 327578 DOI 10.17182/hepdata.36761

We present preliminary results on the measurement of a variety of exclusive hadron interactions at center of mass scattering angles of 90°. Data are also presented which show the relative transparency of nuclei to πp and pp elastic scattering in this kinematic range.

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Comparison of Exclusive Reactions at Large $T$

Baller, B.R. ; Blazey, G.C. ; Courant, H. ; et al.
Phys.Rev.Lett. 60 (1988) 1118-1121, 1988.
Inspire Record 264273 DOI 10.17182/hepdata.3063
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Large-Angle Pion-Proton Elastic Scattering at High Energies

Orear, J. ; Rubinstein, R. ; Scarl, D.B. ; et al.
Phys.Rev. 152 (1966) 1162-1170, 1966.
Inspire Record 50774 DOI 10.17182/hepdata.407
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The angular distribution of backward elastically scattered pions at 3.55 GeV/c

Baker, W.F. ; Carlson, P.J. ; Chabaud, V. ; et al.
Phys.Lett. 23 (1966) 605-609, 1966.
Inspire Record 1389621 DOI 10.17182/hepdata.29776

The elastic scattering of 3.55 GeV/ c π + and π − mesons by protons was measured at centre-of-mass angles between 165° and 177°. The angular distributions for 864 events show a steeply rising backward peak for π + p, while the shape is less clear for π − p.

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Forward angle pi+- p elastic scattering differential cross-sections at T(pi) = 87-MeV to 139-MeV

Brack, J.T. ; Amaudruz, P.A. ; Ottewell, D.F. ; et al.
Phys.Rev. C51 (1995) 929-936, 1995.
Inspire Record 400646 DOI 10.17182/hepdata.25894
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Backward π p elastic scattering at 2.85 and 3.30 GeV/c

Baker, W.F. ; Carlson, P.J. ; Chabaud, V. ; et al.
Phys.Lett. B25 (1967) 361-364, 1967.
Inspire Record 1389663 DOI 10.17182/hepdata.29442

Backward elastic scattering has been measured for π + p at 2.85 and 3.30 GeV/ c and for π − p at 3.30 GeV/ c . The π + p angular distributions show steep backward peaks, whereas the π − p distribution is flatter. At 2.85 GeV/ c the π + p differential cross section close to 180° is more than twice that at 3.30 GeV/ c , supporting the assignment J P = 11 2 + for Δ δ (2420) resonance. The π + p data at 2.85 GeV/ c indicate the onset of a dip at cos θ c.m. ≈ −0.97.

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Perl, Martin L. ; Lee, Yong Yung ; Marquit, Erwin ;
Phys.Rev. 138 (1965) B707-711, 1965.
Inspire Record 98 DOI 10.17182/hepdata.26685
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The relative differential cross-section data in elastic scattering of negative pions on protons between 1.43-GeV/c and 2.07-GeV/c

Alekseev, I.G. ; Budkovsky, P.E. ; Kanavets, V.P. ; et al.
Conference Paper, 1989.
Inspire Record 292460 DOI 10.17182/hepdata.40058
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Elastic scattering and two-body annihilations at 5 gev/c

Eide, A. ; Lehmann, P. ; Lundby, A. ; et al.
Nucl.Phys. B60 (1973) 173-220, 1973.
Inspire Record 83926 DOI 10.17182/hepdata.7885
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pi-p Two-Prong Interactions at 4.16 GeV/c

Eisner, R.L. ; Johnson, P.B. ; Klein, P.R. ; et al.
Phys.Rev. 164 (1967) 1699-1710, 1967.
Inspire Record 52292 DOI 10.17182/hepdata.26569

An analysis of π−p two-prong interactions at 4.16 GeV/c is presented. The total two-prong cross section is 19.11±0.40 mb, based on 33 672 events. The elastic-scattering differential cross section shows an exponential behavior, Kexp(−AΔ2). With A=7.36±0.14 GeV−2, the "absorption parameters" are derived as C+=0.846±0.017 and γ+=0.040±0.001. The final-state π−π0p exhibits a strong ρ−, and the π−π+n a strong ρ0 and f0. The partial cross sections for the dominant resonant channels pρ−, π−Δ+(1236) (→pπ0), ρ0n, and f0n are 0.59±0.03, 0.17±0.01, 1.15±0.05, and 0.53±0.06 mb, respectively. The ρ− production and decay angular distributions do not agree with the predictions of the absorption-modified one-pion-exchange model. However, an inclusion of the contribution from ω exchange adequately accounts for the discrepancy. The ρ0 asymmetry is interpreted as a result of an interference of the resonant P wave and isospin-zero S wave, and the corresponding spin-density matrix elements are obtained. In the final state π−p+neutrals, a clear peak for the η meson and some evidence for the ω meson are seen.

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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.

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Pion production in pi^- - p interactions at energies 790, 830, and 870 MeV

Cason, N.M. ; Derado, I. ; Lamsa, J.W. ; et al.
Phys.Rev. 150 (1966) 1134-1140, 1966.
Inspire Record 50370 DOI 10.17182/hepdata.26587

Single-pion production has been studied in the reactions π−p→π−π+n and π−p→π−π0p at 790, 830, and 870 MeV. A total of 4193 events in these two channels, divided approximately equally between the three energies, have been identified. The most interesting feature of the data is the tendency for events to concentrate at high values of mππ and low values of four-momentum transfer. These effects are discussed in terms of conventional isobar models and a model involving two-pion exchange. Partial cross sections for the reactions studied are reported for each energy.

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pi-p Interactions at 460 MeV

Poirier, C.P. ; Tilger, C.A. ; Alyea, E.D. ; et al.
Phys.Rev. 148 (1966) 1311-1314, 1966.
Inspire Record 50913 DOI 10.17182/hepdata.26590

A total of 1589 two-prong events were observed in an exposure of the Brookhaven National Laboratory 14-in. bubble chamber at the Cosmotron. The fit to the elastic angular distribution requires terms through cos4θc.m.. The ratio of the inelastic cross sections σ(π−p→π−π+n)σ(π−p→π−π0p) is 3.75±0.46. The π−p→π−π+n reaction is dominated by formation of the π−n isobar and an enhancement in the di-pion mass spectrum previously reported by Kirz. The π−p→π−π0p reaction shows no structure in the effective-mass spectra.

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Single-pion production in pi- p interactions at 2.26 gev/c

Reynolds, B.G. ; Albright, John R. ; Bradley, R.H. ; et al.
Phys.Rev. 184 (1969) 1424-1442, 1969.
Inspire Record 62283 DOI 10.17182/hepdata.26478

We present an analysis of ππN final states obtained from π−p interactions at 2.26 GeV/c. Strong ρ production is present in both final states. In addition, significant nucleon isobar production is observed. We observed the following cross sections: σ(π−π0p)=3.77±0.13 mb, σ(π−π+n)=5.67±0.17 mb, σ(ρ−p)=2.19±0.09 mb, σ(Δ+(1236)π−)=0.30±0.10 mb, σ(N0(1650)π0)=0.49±0.07 mb, σ(ρ0n)=2.89±0.11 mb, σ(Δ−(1236)π+)=0.11±0.06 mb, σ(N+(1470)π−)=0.24±0.06 mb, and σ(N+(1650)π−)=0.45±0.05 mb. The spin-density matrix elements are determined for the ρ0 by interpreting the ρ0 asymmetry as an interference between the resonant P wave and a T=0 S wave. A search for the ε0 in the π+π−n final state failed to yield a direct observation of this effect.

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Two-Charged-Particle Final States from pi-+p Interactions at 2.7 GeVc

Miller, D.H. ; Gutay, L. ; Johnson, P.B. ; et al.
Phys.Rev. 153 (1967) 1423-1442, 1967.
Inspire Record 52271 DOI 10.17182/hepdata.26636

A total of 24 360 events having two charged particles in the final state from π−+p interactions at an incident π− momentum of 2.7 GeVc have been analyzed. The final states π−π+n and π−π0p are found to be dominated by rho-meson production, and in addition, significant N*(1238) production is seen. The partial cross sections for the dominant resonant channels are σ=(pρ−)=(1.3±0.2) mb, σ(nρ0)=(2.3±0.2) mb, and σ[π−N*+(→pπ0)]=(0.5±0.2) mb. The production of the ρ− and ρ0 and the decay of the ρ− agree very well with the predictions of an absorption-modified one-pion-exchange model. The production angular distributions of the ρ0 and ρ− follow an exponential of the form Ae+Bt. The results from a least-squares fit give B(ρ−)=9.32±0.08 (GeVc)−2, B(ρ0)=10.26±0.06 (GeVc)−2. A similar analysis for the elastic-scattering events gave B(el)=7.77±0.05 (GeVc)−2. The ρ0 decay distributions are asymmetric and they have been analyzed using a simple model which includes S−P-wave interference. No clear evidence is seen for a T=0, J=0 resonance at a mass near that of the ρ. The N*(1238) resonance production is found to be in agreement with the ρ-exchange model of Stodolsky and Sakurai. Indication of other resonance production with small cross section is seen, such as A1 and A2 production in the multiple missing neutral events. The masses and widths of the ρ0 and ρ− as a function of the four-momentum transfer squared to the nucleon have been determined.

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Frank, J.S. ; Browman, A.A. ; Gram, P.A.M. ; et al.
Phys.Rev. D28 (1983) 1569-1585, 1983.
Inspire Record 196833 DOI 10.17182/hepdata.23815
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