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Photoproduction of Neutral Mesons in Hydrogen at High Energies

Walker, R.L. ; Oakley, D.C. ; Tollestrup, A.V. ;

Phys.Rev. 89 (1953) 1301-1302, 1953.

Inspire Record 944936 DOI 10.17182/hepdata.26445

None

1 data table

Table 1

No description provided.

Photoproduction of Neutral Pions in Hydrogen: p-gamma Coincidences

Walker, R.L. ; Oakley, D.C. ; Tollestrup, A.V. ;

Phys.Rev. 97 (1955) 1279-1282, 1955.

Inspire Record 48029 DOI 10.17182/hepdata.26406

This paper reports measurements of the differential cross section for photoproduction of neutral pions in hydrogen at energies 300, 400, and 450 Mev, at center-of-momentum angles of 70° to 150°. One decay photon from the neutral pion is observed in coincidence with the recoil proton, whose energy and angle are measured to define the photon energy. The results obtained by this method are in good agreement with more accurate measurements obtained recently by the method of observing only the recoil proton.

3 data tables

Table 1

No description provided.

Table 2

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Table 3

No description provided.

Photoproduction of Positive Pions in Hydrogen-Counter Telescope Method

Tollestrup, A.V. ; Keck, J.C. ; Worlock, R.M. ;

Phys.Rev. 99 (1955) 220-228, 1955.

Inspire Record 944929 DOI 10.17182/hepdata.26395

The excitation functions for positive pion production from hydrogen have been obtained in the energy region from 230 Mev to 450 Mev and at laboratory pion angles of 24°, 38°, 53°, 73°, 93°, 115°, 140°, and 160°. The pions are detected and identified by measuring their range and ionization in a scintillation counter telescope. The above data are analyzed to give the angular distributions in the center-of-momentum system, and a least-squares analysis made to determine coefficients in σ(θ)=A+Bcosθ+Ccos2θ. The total cross section shows a peak at 300 Mev of magnitude 2.20×10−28 cm2. The coefficient B passes through a maximum negative value at 250 Mev and then passes through zero at 325 Mev and remains positive up to the highest energy measured.

9 data tables

Table 1

No description provided.

Table 2

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Table 3

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Evidence for Vector-Meson Effects on pi0 Photoproduction From Hydrogen

Talman, R.M. ; Clinesmith, C.R. ; Gomez, R. ; et al.

Phys.Rev.Lett. 9 (1962) 177-180, 1962.

Inspire Record 944904 DOI 10.17182/hepdata.19353

None

3 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

Anti-p p annihilation into pi+ rho at small angles between 1 and 2 gev/c

Yoh, J.K. ; Barish, B. ; Nicholson, H.W. ; et al.

Phys.Rev.Lett. 26 (1971) 922-925, 1971.

Inspire Record 69017 DOI 10.17182/hepdata.21588

We have studied the process p¯p into π+X− using wire spark chambers. The data cover the angular range of cosθp¯π+* between 0.96 and 1.0 at several incident momenta between 1 and 2 GeVc. The reaction p¯p→π+ρ− was observed with (dσdΩ)* of the order of 100 μb/sr at several momenta.

1 data table

Table 1

READ FROM GRAPH.

Formation of the Sigma (2030) Resonance in the Reactions K- n --> Sigma- pi0 and K- n --> Sigma0 pi- in the Center-Of-Mass Energy Interval 1850-MeV to 2150-MeV

Goyal, D.P. ; Sodhi, A.V. ;

Phys.Rev.D 16 (1977) 2746-2753, 1977.

Inspire Record 126664 DOI 10.17182/hepdata.24480

A partial-wave analysis of the pure isospin I = 1 reactions K−n→Σ−π0 and K−n→Σ0π− in the center-of-mass energy range 1850-2150 MeV is reported. The decay mode Σ(2030)→Σπ is observed with a branching ratio xr given by eiφ(xexr)12 = −0.085±0.02, where xe is the elasticity and φ is the relative phase of the resonance with the phase of Σ(1765) taken to be zero.

2 data tables

Table 1

LEGENDRE COEFFICIENTS FOR EVENTS WITH SEEN SPECTATORS.

Table 2

LEGENDRE COEFFICIENTS FOR ALL EVENTS.

Measurements of the pi- p --> pi0 n Forward Scattering Cross-Section in the Energy Region 400-MeV-600-MeV

Kravtsov, A.V. ; Kuzmin, L.A. ; Nemozhenko, O.N. ; et al.

Nucl.Phys.B 140 (1978) 279-284, 1978.

Inspire Record 135966 DOI 10.17182/hepdata.34984

The forward charge-exchange differential cross section has been measured using two Čerenkov spectrometers at five energies of incident pions. The resulting cross-section values are 4.02 ± 0.22, 3.61 ± 0.13, 4.19 ± 0.13, 3.91 ± 0.12, 3.02 ± 0.14 mb/sr at incident pion energies 400, 450, 500, 550 and 600 MeV, respectively. These values are in a good agreement with dispersion-relation predictions.

1 data table

Table 1

No description provided.