Akhundov, Arif A.
Electron production
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Further evidence for the decay mode x(0) ---> gamma gamma and determination of the branching ratio x(0) ---> gamma gamma/ x(0) ---> total

Basile, M. ; Bollini, D. ; Dalpiaz, P. ; et al.
Nucl.Phys.B 33 (1971) 29-41, 1971.
Inspire Record 68511 DOI 10.17182/hepdata.33085

41 ± 8 events of the type X 0 → γγ have been observed in a study of the reaction π − p → n(X 0 → γγ ) at 1.6 GeV/ c incident π -momentum. This provides further evidence to our previous observation of this new X 0 decay mode and allows the determination of the branching ratio Γ(X 0 →γγ) Γ(X 0 → total =(1.7 ± 0.4)%. The theoretical implications of this result are discussed.

1 data table
Table 1

THIS MEASUREMENT WHEN COMBINED WITH THE ETAPRIME PRODUCTION CROSS SECTION OF M. BASILE ET AL., NC 3A, 371 (1971) YIELDS A BR(ETAPRIME --> 2GAMMA) OF 1.7 +- 0.4 PCT.


Single photoproduction of eta-mesons on hydrogen in the forward direction at 4 and 6 gev

Braunschweig, W. ; Erlewein, W. ; Frese, H. ; et al.
Phys.Lett.B 33 (1970) 236-240, 1970.
Inspire Record 63065 DOI 10.17182/hepdata.28543

The differential cross-section of the reaction γ p→ η p has been measured at the Deutsches Elektronen Synchrotron (DESY) at mean photon energies of 4 and 6 GeV in the momentum transfer range between zero and 1.4 GeV 2 . The data show a slight maximum around t =−0.15 GeV 2 and fall off smoothly till t =−1.4 GeV 2 . There is no indication of a dip around t =−0.5 GeV 2 .

2 data tables
Table 1

Axis error includes +- 19/19 contribution.

Table 2

Axis error includes +- 19/19 contribution.


Pi0 PHOTOPRODUCTION FROM HYDROGEN AT BACKWARD ANGLES

Tompkins, D.H. ; Anderson, Robert L. ; Gittelman, Bernard J. ; et al.
Phys.Rev.Lett. 23 (1969) 725-728, 1969.
Inspire Record 54854 DOI 10.17182/hepdata.21587

Cross sections for π0 photoproduction from hydrogen in the backward direction have been measured for photon energies of 6, 8, 12, and 18 GeV. The range of momentum transfer covered in these measurements is −1 (GeVc)2

12 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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A COMPARISON OF ELECTRON - PROTON AND POSITRON - PROTON ELASTIC SCATTERING AT FOUR MOMENTUM TRANSFERS UP TO 5.0-GeV/c**2

Mar, J. ; Barish, Barry C. ; Pine, Jerome ; et al.
Phys.Rev.Lett. 21 (1968) 482-484, 1968.
Inspire Record 52726 DOI 10.17182/hepdata.21724

Measurements of the ratio (R) of positron-proton and electron-proton elastic-scattering cross sections have been made, with the square of the four-momentum transfer (q2) equal to 0.20, 0.69, 0.73, 1.54, 2.44, 3.27, 3.79, and 5.00 (GeV/c)2. The measurements, after radiative corrections, are consistent with R=1, with standard errors ranging from ±0.016 to ±0.123. The results give limits for the size of the two-photon effects.

2 data tables
Table 1

No description provided.

Table 2

No description provided.


Angular Distribution for Eta-Meson Photoproduction from Hydrogen at 775-850 MeV

Bacci, C. ; Baldini-Celio, R. ; Mencuccini, C. ; et al.
Phys.Rev.Lett. 20 (1968) 571-574, 1968.
Inspire Record 944916 DOI 10.17182/hepdata.21723

None

3 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.


Observation of Resonance in the $K^{0}_{1}K^{0}_{1}$ System

Beusch, W. ; Fischer, W.E. ; Gobbi, B. ; et al.
Phys.Lett.B 25 (1967) 357-361, 1967.
Inspire Record 52538 DOI 10.17182/hepdata.29450

We have analyzed 2560 events in the final-state K O 1 K O 1 n produced in π − p interactions at 5, 7 and 12 GeV/ c . We observe the S ∗ (1070), f O and A 2 decaying into K O 1 K O 1 . Resonance parameters, cross sections, and branching ratios are given.

1 data table
Table 1

Cross section times branching ratio.


eta Production near Threshold

Jones, W.G. ; Binnie, D.M. ; Duane, A. ; et al.
Phys.Lett. 23 (1966) 597, 1966.
Inspire Record 50962 DOI 10.17182/hepdata.29781

A study of π − + p →η + n near threshold shows that the cross section rises linearly with η momentum and that Λ η < 0.9 MeV c 2 (95% confidence limit).

1 data table
Table 1

Errors are statistical only.


Positron-Proton Scattering

Browman, A. ; Liu, F. ; Schaerf, C. ;
Phys.Rev. 139 (1965) B1079-B1085, 1965.
Inspire Record 944961 DOI 10.17182/hepdata.26686

The importance of two-photon exchange in elastic electron-proton scattering was investigated by measuring the ratio of positron-proton to electron-proton scattering. Four-momentum transfers as large as 0.756 (BeV/c)2 (19.5 F−2) were used. The data indicate that two-photon effects are (4.0±1.5)% larger than those predicted by the radiative corrections at the highest momentum transfers attained in these experiments. The two-photon corrections predicted using a static charge distribution fit the data well at lower momentum transfers and forward angles, but appear to be small at higher momentum transfers and backward angles.

10 data tables
Table 1

Data recalculated from the data of Yount and Pine.

Table 2

Data recalculated from the data of Yount and Pine. RUN_1 and RUN_2 of the Yount and Pine experiment were separated by large time interval.

Table 3

Data recalculated from the data of Yount and Pine.

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