On the measurement of $\pi^{+}$ meson photoproduction from hydrogen near threshold

Lewis, G.M. ; Azuma, R.E. ;
Proc.Phys.Soc. 73 (1959) 873-880, 1959.
Inspire Record 1393355 DOI 10.17182/hepdata.26968

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1 data table

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Photoproduction of charged pions near threshold

Adamovich, M.I. ; Gorzhevskaya, É.G. ; Larionova, V.G. ; et al.
Sov.Phys.JETP 11 (1960) 779-782, 1960.
Inspire Record 1392962 DOI 10.17182/hepdata.71292

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12 data tables

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Differential cross sections for the photoproduction of mesons on protons in the photon energy interval 165-230 MeV

Adamovich, M.I. ; Larionova, V.G. ; Kharlamov, S.P. ; et al.
Sov.J.Nucl.Phys. 7 (1968) 360-365, 1968.
Inspire Record 1392568 DOI 10.17182/hepdata.18930

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14 data tables

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Determination of the γ - π - ρ coupling constant from the −/+ ratio for photoproduction from deuterium

Pine, J. ; Bazin, M. ;
Phys.Lett. 5 (1963) 168-170, 1963.
Inspire Record 1388798 DOI 10.17182/hepdata.27961

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3 data tables

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Differential cross-sections for photoproduction of positive pions in hydrogen I. — low energies

Beneventano, M. ; Bernardini, G. ; Carlson-Lee, D. ; et al.
Nuovo Cim. 4 (1956) 323-356, 1956.
Inspire Record 1185320 DOI 10.17182/hepdata.37599

The cross-sections σ(Eγ,ϑ ) for the reaction pγ→ n+ have been measured near threshold as a function of photon energy and at four angles. See Table I. These results combined with previously known data, have given a fairly complete and accurate description of σ(Eγ,θ) between the limits 30°≤θ≤180° and 170≤ Eγ 270 MeV. See Table II and Pig. 2. Writing σ(Eγ,θ) = W·a0 + a1 cos θ + a2 cos2 θ× withW= ηωl +(μ/Ei)ξ −1·l + (μ/E f )ω×−1 (see formula (5)) the experimental data indicate that (Table III) a0 is constant up to about Eγ ≃ 260 MeV; and that (Table V) the three ai coefficients analyzed in terms ofS andP waves give a very small spin flippingP-amplitudeK. The presumption that theS amplitudeE 1 ismainly due to the gauge invariance requirement is definitely not consistent with the data (see Table IV). A discussion based on the Kroll and Rudermann theorem leads to the conclusion that this inconsistency may be eliminated if allowance is made for the contribution of fairly large nucleon recoils. However, it turns out that only the changing sign part of these recoils is really large and apparently so up to terms of order higher than μM. The amount of the recoil at threshold is estimated and consequently a value for the pspv interaction constant is derived.

7 data tables

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Photoproduction of charged pions in deuterium

Beneventano, M. ; Bernardini, G. ; Stoppini, G. ; et al.
Nuovo Cim. 10 (1958) 1109-1142, 1958.
Inspire Record 1184858 DOI 10.17182/hepdata.37846

perimental analysis of the process is presented. Theσ(−)/σ(+) ratio has been measured in the photon energy interval (170÷230) MeV and Lab. angles 45°, 75°, 105°, 150°. The results are interpreted on the base of the impulse approximation with the aim of getting information on the processhv+n →π −+p.

6 data tables

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PI+ PHOTOPRODUCTION AT CONSTANT PION ENERGY, AND THE (GAMMA PI RHO) COUPLING

Leith, David W.G.S. ; Little, R. ; Lawson, E.M. ;
Phys.Lett. 8 (1964) 355-357, 1964.
Inspire Record 8509 DOI 10.17182/hepdata.27375

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1 data table

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Absolute Positive Pion Photoproduction Cross Sections from Hydrogen

Walker, R.J. ; Palfrey, T.R. ; Haxby, R.O. ; et al.
Phys.Rev. 132 (1963) 2656-2663, 1963.
Inspire Record 944973 DOI 10.17182/hepdata.26773

Absolute differential cross sections for the photoproduction of pions of 33.8-MeV laboratory kinetic energy from protons were measured at eight angles between 29.5 and 146.1° in the center-of-mass system. The over-all absolute accuracy is 4%, while the relative accuracy within the angular distribution is 3%. Comparison is made to various theoretical calculations, with and without inclusion of the effect of a γ−π−ρ-meson coupling. Existing calculations based on dispersion theory give only fair agreement with the data.

1 data table

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Photoproduction of pi+ Mesons from Hydrogen

Bazin, M.J. ; Pine, J. ;
Phys.Rev. 132 (1963) 830-836, 1963.
Inspire Record 944971 DOI 10.17182/hepdata.26741

The differential cross section for π+ photoproduction has been determined at 19 points, at center-of-mass angles from 30 to 150 deg, and at photon energies from 162 to 225 MeV. The data are concentrated near 180 MeV, where a full angular distribution has been determined. The relative values of the cross sections are accurate to 5% or better, and the absolute normalization is accurate to 4%. The experiment provides data of improved accuracy which are in general consistent with previous results. The extrapolation to threshold gives a value for (k*p*)(dσdΩ)* at threshold of 16.1±0.7 μb/sr, where k*, p*, and (dσdΩ)* are the photon energy, pion momentum, and differential cross section, all in the center-of-mass system.

3 data tables

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Photoproduction of Low-Energy Charged Pions from Deuterium

Burq, J.P. ; Walker, J.K. ;
Phys.Rev. 132 (1963) 447-454, 1963.
Inspire Record 944972 DOI 10.17182/hepdata.26772

Accurate measurements have been made of the π−π+ photoproduction ratio on deuterium, in the gammaray energy range 165-210 MeV, for several angles: 155°, 125°, 90° (center-of-mass system) and along Baldin's kinematical line. These last data are new contributions: π−π+=1.20±0.03 averaged between 165 and 180 MeV. The others are improvements of the accuracy of previous data. The comparison with Ball's theory, corrected for taking into account the I=12 phase shifts, gives for the coupling constant Λ for γ−π−p the value: 0.25<+Λe<0.75.

1 data table

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