Experimental verification of the Kramers-Kronig relation at high energy

Alvensleben, H. ; Becker, U. ; Biggs, P.J. ; et al.
Phys.Rev.Lett. 30 (1973) 328-332, 1973.
Inspire Record 84536 DOI 10.17182/hepdata.21393

The real part of the forward amplitude for Compton scattering on protons was measured through the interference between the Compton and Bethe-Heithler amplitudes by detecting the zero-degree electron pairs asymmetrically. The measurement was made at an average photon energy of 〈k〉=2.2 GeV, and an average momentum transfer to the recoil proton 〈t〉=−0.027 (GeV/c)2. The result confirms the prediction of the Kramers-Kronig relation.

1 data table match query

No description provided.


Proton Compton effect by polarized photons at 90 degrees in the c.m. system in the first resonance region

Barbiellini, G. ; Capon, G. ; De Zorzi, G. ; et al.
Phys.Rev. 174 (1968) 1665-1673, 1968.
Inspire Record 55887 DOI 10.17182/hepdata.26496

For the reaction γ+p→γ′+p′ (proton Compton effect), we have measured the ratio dσIIdσ⊥ between the cross sections for linearly polarized photons, using the coherent bremsstrahlung beam of the Frascati electron synchrotron. At 90° in the c.m. system and in the photon energy region 300≤K≤335 MeV, we find dσIIdσ⊥=2.1−0.4+0.5. In the absence of theoretical predictions based on the dispersive theory in this energy region, this result is compared with the values obtained using an isobaric model, taking into account various possible intermediate states.

1 data table match query

Axis error includes +- 0.0/0.0 contribution (?////).


Compton scattering of 3.5 gev polarized photons on protons

Buschhorn, G. ; Criegee, L. ; Franke, G. ; et al.
Phys.Lett.B 37 (1971) 211-212, 1971.
Inspire Record 69081 DOI 10.17182/hepdata.28375

Elastic scattering of linearly polarized photons on protons has been measured between 3.2 and 3.7 GeV for four-momentum transfers ranging from −0.1 to −0.7 (GeV/ c ) 2 . The observed cross section asymmetry in this range is consistent with zero within ±0.05.

1 data table match query

No description provided.


RECOIL PROTON POLARIZATION OF PROTON COMPTON SCATTERING IN THE RESONANCE REGION

Wada, Y. ; Kato, S. ; Miyachi, T. ; et al.
Nuovo Cim.A 63 (1981) 57-70, 1981.
Inspire Record 170488 DOI 10.17182/hepdata.37543

The recoil proton polarization of proton Compton scattering (γp→γp) was measured in the photon energy range from 500 MeV to 1000 MeV atθ∗=100° and from 400MeV to 800 MeV atθ∗=130°. A recoil proton and a scattered photon were detected in coincidence with a magnetic spectrometer and a photon detector. The recoil proton polarization was measured with a carbon polarimeter. The results are compared with a phenomenological analysis based on an isobar model and a dynamical analysis based on the dispersion relation.

2 data tables match query

No description provided.

No description provided.


Polarization of recoil protons from proton Compton scattering in the region of the second pi n resonance

Kabe, S. ; Fujii, T. ; Kamei, T. ; et al.
Nucl.Phys.B 50 (1972) 17-28, 1972.
Inspire Record 84330 DOI 10.17182/hepdata.32704

The polarization of recoil protons from proton Compton scattering has been measured at an angle of 90° c.m.s. in the region of the second nucleon resonance. The scattered photons were detected by a telescope which consisted of a lead plate converter, scintillation-counter hodoscopes and a Ćerenkov counter, The angles and momenta of recoil protons were analyzed by a magnet with four spark chambers. The polarization of protons was obtained from the asymmetry in the elastic scattering of protons on carbon in a spark chamber.

1 data table match query

Axis error includes +- 0.0/0.0 contribution (?////).


Polarization transfer in proton Compton scattering at high momentum transfer.

The Jefferson Lab Hall A collaboration Hamilton, D.J. ; Mamyan, V.H. ; Aniol, K.A. ; et al.
Phys.Rev.Lett. 94 (2005) 242001, 2005.
Inspire Record 660894 DOI 10.17182/hepdata.19389

Compton scattering from the proton was investigated at s=6.9 (GeV/c)**2 and \t=-4.0 (GeV/c)**2 via polarization transfer from circularly polarized incident photons. The longitudinal and transverse components of the recoil proton polarization were measured. The results are in excellent agreement with a prediction based on a reaction mechanism in which the photon interacts with a single quark carrying the spin of the proton and in disagreement with a prediction of pQCD based on a two-gluon exchange mechanism.

1 data table match query

Polarization transfer parameters.


MEASUREMENT OF THE ANGULAR DISTRIBUTION OF COMPTON SCATTERING OFF PROTONS gamma p ---> gamma p BETWEEN 800-MeV AND 950-MeV

de Marne, Klaus-Dieter ;
BONN-IR-79-5, 1979.
Inspire Record 140558 DOI 10.17182/hepdata.50146

None

6 data tables match query

No description provided.

No description provided.

No description provided.

More…

Differential Cross-sections of Proton Compton Scattering at Photon Laboratory Energies Between 1.2-{GeV} and 1.7-{GeV}

Duda, J. ; Hofner, F.W. ; Jung, M. ; et al.
Z.Phys.C 17 (1983) 319, 1983.
Inspire Record 182590 DOI 10.17182/hepdata.50210

Differential cross sections of proton Compton scattering have been measured at the Bonn 2.5 GeV synchrotron. The experiment covers photon laboratory energies between 1.2 GeV and 1.7 GeV and the square of the four-momentum transfer ranges fromt=−0.17 GeV2 to −0.98GeV2 corresponding to c.m. scattering angles between 35° and 80°. The cross sections exhibit a forward peak followed by a monotone fall-off up to the largest measured |t|-values. Fits of the formdσ/dt=A·exp(Bt) to the data points with |t|≦0.5 GeV2 yield forward cross sectionsA, which are consistent with the 0° cross sections calculated from the measured total photon-proton cross section. The average slope isB=5.6±0.14 GeV2.

13 data tables match query

No description provided.

No description provided.

No description provided.

More…

MEASUREMENT OF THE ANGULAR DISTRIBUTION OF COMPTON SCATTERING OFF PROTONS gamma p ---> gamma p BETWEEN 800-MeV AND 950-MeV

Leu, Peter ;
PhD Thesis, 1979.
Inspire Record 140559 DOI 10.17182/hepdata.50225
6 data tables match query

No description provided.

No description provided.

No description provided.

More…

Differential Cross-sections of Proton Compton Scattering at Photon Laboratory Energies Between 700-{MeV} and 1000-{MeV}

Jung, M. ; Kattein, J. ; Kuck, H. ; et al.
Z.Phys.C 10 (1981) 197, 1981.
Inspire Record 165344 DOI 10.17182/hepdata.50251

Differential cross sections of proton Compton scattering have been measured at the Bonn 2.5 GeV synchrotron. 78 data points are presented as angular distributions at photon lab energies of 700, 750, 800, 850, 900, and 950MeV. The c.m. scattering angle ranges from 40°–130°, corresponding to a variation of the four momentum transfer squared betweent=−0.10 tot=−0.96 GeV2 at 700 and 950 MeV, respectively. Two additional differential cross sections have been measured at 1000MeV, 35.6° and 47.4°. The angular distributions show forward peaks whose extrapolations to 0° are consistent with calculated forward cross sections taken from literature. The small angle data (|t| ≲0.2 GeV2) together with the calculated cross sections at 0° are also consistent with the assumption of a slope parameterB of 5 GeV−2. For the first time a rerise of the angular distributions towards backward angles has been observed. It becomes less steep with increasing energy. The most interesting feature of the angular distributions is a sharp structure which appears betweent=−0.55 GeV2 at 700MeV andt=−0.72 GeV2 at 950 MeV. Such a rapid varation of the differential cross section witht has never been ovserved in elastic hadron-hadron scattering or photoproduction processes. It indicates the existence of a dynamical mechanism which could be a peculiarity of Compton scattering.

14 data tables match query
More…

COMPTON SCATTERING FROM HYDROGEN BETWEEN 5-GeV AND 17-GeV

Anderson, Robert L. ; Gustavson, D. ; Johnson, J.R. ; et al.
Phys.Rev.Lett. 25 (1970) 1218, 1970.
Inspire Record 60845 DOI 10.17182/hepdata.21597

Measurements have been made on Compton scattering for photon energies between 5 and 17 GeV and t values from -0.06 to -1.1 (GeVc)2. The data were obtained by performing a coincidence between the Stanford Linear Accelerator Center 1.6-GeVc spectrometer and a Lucite shower counter. The scattering appears diffractive out to high t values, but the cross sections seem not to be in good agreement with the prediction of a strict vector-meson-dominance model.

4 data tables match query

No description provided.

No description provided.

No description provided.

More…

Proton Compton Scattering Measurement From 450 to 1350 MeV Near 90-degrees in the Center-of-Mass System

Rust, D.R. ; Eisenhandler, E. ; Mostek, P.J. ; et al.
Phys.Rev.Lett. 15 (1965) 938-941, 1965.
Inspire Record 944922 DOI 10.17182/hepdata.21794

None

1 data table match query

No description provided.


Proton Compton scattering at 0.55-to-4.5-gev energy and 0.12-to-1.0-(gev/c)-squared momentum transfer

Deutsch, M. ; Cleetus, K.J. ; Golub, L. ; et al.
Phys.Rev.D 8 (1973) 3828-3847, 1973.
Inspire Record 93270 DOI 10.17182/hepdata.22057

Results are presented on the elastic scattering of photons by protons. The incident photon energy ranged from 0.55 GeV to 4.5 GeV, and the four-momentum transfer t ranged from 0.12 to 1.0 (GeV/c)2. The data at large angles, 60°<θ*<115°, are characterized by a pronounced excitation of the D13(1518) resonance, a shoulder in the 1688-MeV mass region, and a precipitous drop thereafter in the cross section as a function of incident energy. The low-t data are characterized by a diffraction slope of 5 (GeV/c)−2. The data are inconsistent with the predictions of the vector-dominance model if the latter is restricted to ρ0, ω, and φ vector mesons.

1 data table match query

No description provided.


Elastic Scattering of Gamma Rays by Protons

Stiening, R.F. ; Loh, E. ; Deutsch, Martin ;
Phys.Rev.Lett. 10 (1963) 536-537, 1963.
Inspire Record 46876 DOI 10.17182/hepdata.21849

None

1 data table match query

No description provided.


Differential Cross-Sections of the Proton Compton Scattering in the Energy Between 450-MeV and 950-MeV

Toshioka, K. ; Chiba, M. ; Kato, S. ; et al.
Nucl.Phys.B 141 (1978) 364-378, 1978.
Inspire Record 120614 DOI 10.17182/hepdata.34955

The differential cross sections of the proton Compton scattering around the second resonance have been measured at a c.m. angle of 90° for incident photon energies between 450 MeV and 950 MeV in steps of 50 MeV, and at an angle of 60° for energies between 600 MeV and 800 MeV. The results show that the peak of the 2nd resonance agrees with that of the pion photoproduction process. We also calculated the proton Compton scattering based on unitarity and fixed- t dispersion relations. The calculation describes well the data of the cross section and the recoil proton polarization.

2 data tables match query

No description provided.

No description provided.


Small Angle Compton Scattering on Hydrogen and Deuterium

Criegee, L. ; Franke, G. ; Giese, A. ; et al.
Nucl.Phys.B 121 (1977) 31-37, 1977.
Inspire Record 118810 DOI 10.17182/hepdata.35467

We have measured elastic scattering of 5 and 6 GeV photons on hydrogen and deuterium in the angular range 10–50 mrad. On hydrogen we observe a forward diffraction peak with a slope of 8.5 (GeV/ c ) −2 . The extrapolated forward cross sections in units μ b/(GeV/ c ) 2 are 0.82 ± 0.04 at 5 GeV and 0.79 ± 0.04 at 6 GeV. They are consistent with the calculated amplitudes obtained from total cross section measurements via the optical theorem and dispersion relations assuming negligible contributions of spin-dependent amplitudes. Deuterium cross sections show a transition from coherent scattering at low | t | to incoherent scattering at higher | t |. They indicate that the isovector exchange amplitude a 1 is very small compared to the isoscalar a 0 . We obtain |a 1 | 2 /|a 0 +a 1 | 2 =0.13±0.09 , Re (a 0 a ∗ 1 )/|a 0 +a 1 | 2 =0.0±0.03, at 5 GeV , |a 1 | 2 /|a 0 +a 1 | 2 =−0.12±0.15 , Re (a 0 a ∗ 1 )/|a 0 +a 1 | 2 =0.10±0.04, at 6 GeV .

2 data tables match query

No description provided.

No description provided.


Elastic Scattering of Photon by Protons in the Low-Energy Region

Baranov, P.S. ; Buinov, G.M. ; Godin, V.G. ; et al.
Yad.Fiz. 21 (1975) 689-698, 1975.
Inspire Record 102948 DOI 10.17182/hepdata.19097

None

2 data tables match query

Axis error includes +- 1/1 contribution.

Axis error includes +- 1/1 contribution.


FORWARD COMPTON SCATTERING FROM HYDROGEN AND DEUTERIUM AT 8-GeV AND 16-GeV

Boyarski, A. ; Coward, D.H. ; Ecklund, Stanley D. ; et al.
Phys.Rev.Lett. 26 (1971) 1600-1604, 1971.
Inspire Record 67269 DOI 10.17182/hepdata.21513

Compton-scattering cross sections from hydrogen (γp→γp) and from deuterium have been measured at four-momentum transfer t in the range 0.014<~−t<~0.17 GeV2 and photon energies of 8 and 16 GeV. Fits to our proton data of the form dσdt=AeBt give B≈7.8 GeV−2 and an intercept A which is in agreement with the optical point. Both coherent scattering from deuterons and incoherent scattering from neutrons and protons are seen from deuterium. A small difference between the neutron and proton cross sections is seen, indicating the presence of about a 3% isovector t-channel exchange amplitude in addition to the predominant isoscalar amplitude. The vector-dominance model predicts lower cross sections (by at least 20%) for both the hydrogen and deuterium cases.

2 data tables match query

Axis error includes +- 3/3 contribution (SUBTRACTIONS WERE MADE FOR THE REACTIONS GAMMA P --> PI0 N, ETA N, OMEGA N AND PI0 DELTA(1232)).

Axis error includes +- 3/3 contribution (SUBTRACTIONS WERE MADE FOR THE REACTIONS GAMMA P --> PI0 N, ETA N, OMEGA N AND PI0 DELTA(1232)).


Proton Compton scattering between 650 mev and 1350 mev

Barton, J.S. ; Booth, P.S.L. ; Carroll, L.J. ; et al.
Phys.Lett.B 42 (1972) 297-300, 1972.
Inspire Record 85012 DOI 10.17182/hepdata.28187

Compton scattering from protons has been measured between 650 MeV and 1350 MeV for angles between 60° and 140° CM.

1 data table match query

No description provided.


Proton Compton scattering between 2.2 and 7 gev

Buschhorn, G. ; Criegee, L. ; Franke, G. ; et al.
Phys.Lett.B 37 (1971) 207-210, 1971.
Inspire Record 69082 DOI 10.17182/hepdata.28376

Proton Compton scattering has been measured in a coincidence experiment at photon energies between 2.2 and 7 GeV and four-momentum transfers t between −0.06 and −0.85(GeV/ c ) 2 . For ∣ t ∣ ⩽ 0.4 (GeV/ c ) 2 fits of the form d σ /d t = ( A · exp( Bt )) yield forward cross sections A in good agreement with the values calculated from the total hadronic γ p cross section via the optical theorem and the forward dispersion relation. The slopes B do not show a significant energy dependence, the mean value being 5.7 ± 0.4 (GeV/ c ) −2 . The cross section is substantially larger than predicted by the vector-meson dominance model.

7 data tables match query

No description provided.

No description provided.

No description provided.

More…

Measurement of proton Compton scattering at 6 gev and small momentum transfers

Buschhorn, G. ; Criegee, L. ; Dubal, L. ; et al.
Phys.Lett.B 33 (1970) 241-244, 1970.
Inspire Record 63064 DOI 10.17182/hepdata.28544

Compton scattering on protons has been measured at a mean photon energy of 6 GeV and four-momentum transfers − t between 0.06 and 0.60 (GeV/ c ) 2 . The differential cross section shows a diffraction-like behaviour. The cross section extrapolated to t =0 is in fair agreement with the optical point. Discrepancies with the vector meson dominance model are pointed out.

1 data table match query

No description provided.


Elastic Photon Proton Scattering in the 50-{GeV} - 130-{GeV} Range

Breakstone, A.M. ; Cheng, D.C. ; Dorfan, D.E. ; et al.
Phys.Rev.Lett. 47 (1981) 1778-1781, 1981.
Inspire Record 173082 DOI 10.17182/hepdata.20627

In the tagged-photon beam at Fermilab, differential cross sections were measured for the elastic scattering of photons on a liquid-hydrogen target. The diffractive forward peak was measured for photon energies between 50 and 130 GeV and |t| values between 0.07 and 1.20 (GeV/c)2. The shape of the diffraction peak is similar to that seen in π−p scattering. The magnitude is that predicted by the optical theorem.

3 data tables match query

No description provided.

No description provided.

No description provided.


PROTON COMPTON SCATTERING AT BACKWARD ANGLES IN THE ENERGY RANGE FROM 400-MeV TO 1050-MEV

Wada, Y. ; Egawa, K. ; Imanishi, A. ; et al.
Nucl.Phys.B 247 (1984) 313-338, 1984.
Inspire Record 215373 DOI 10.17182/hepdata.33842

Differential cross sections of proton Compton scattering have been measured in the energy range between 400 MeV and 1050 MeV at C.M.S. angles of 150° and 160°.

3 data tables match query

No description provided.

No description provided.

No description provided.


DIFFERENTIAL CROSS-SECTIONS FOR PROTON COMPTON SCATTERING AT INCIDENT PHOTON ENERGIES BETWEEN 900-MeV AND 1150-MEV

Ishii, T. ; Egawa, K. ; Imanishi, A. ; et al.
Nucl.Phys.B 254 (1985) 458-474, 1985.
Inspire Record 218918 DOI 10.17182/hepdata.33788

Differential cross sections of proton Compton scattering have been measured in the angular range between 50° and 130° at incident photon energies from 900 MeV to 1150 MeV. A sharp dip in the angular distribution found by a Bonn group at 110° in the photon energy region around 900 MeV is not observed in the present measurement. A new dip-bump structure is found at photon energies above 1050 MeV, which is similar to that for pion-nucleon scattering.

12 data tables match query

No description provided.

No description provided.

No description provided.

More…

Differential Cross-sections of the Proton Compton Scattering in the Resonance Region

Ishii, T. ; Egawa, K. ; Kato, S. ; et al.
Nucl.Phys.B 165 (1980) 189-208, 1980.
Inspire Record 142130 DOI 10.17182/hepdata.34584

Differential cross sections of proton Compton scattering have been measured in the energy range between 375 MeV and 1150 MeV in steps of 25 MeV at c.m. angles of 130°, 100° and 70°. The recoil proton was detected with a magnetic spectrometer. In coincidence with the proton, the scattered photon was detected with a lead-glass Čerenkov counter of the total absorption type.

3 data tables match query

No description provided.

No description provided.

No description provided.


Compton scattering cross section on the proton at high momentum transfer.

The Hall A collaboration Danagoulian, A. ; Mamyan, V.H. ; Roedelbronn, M. ; et al.
Phys.Rev.Lett. 98 (2007) 152001, 2007.
Inspire Record 743383 DOI 10.17182/hepdata.31472

Cross-section values for Compton scattering on the proton were measured at 25 kinematic settings over the range s = 5-11 and -t = 2-7 GeV2 with statistical accuracy of a few percent. The scaling power for the s-dependence of the cross section at fixed center of mass angle was found to be 8.0 +/ 0.2, strongly inconsistent with the prediction of perturbative QCD. The observed cross-section values are in fair agreement with the calculations using the handbag mechanism, in which the external photons couple to a single quark.

4 data tables match query

Cross section of proton Compton Scattering at centre of mass energy squared of 4.82 GeV.

Cross section of proton Compton Scattering at centre of mass energy squared of 6.79 GeV.

Cross section of proton Compton Scattering at centre of mass energy squared of 8.90 GeV.

More…

Proton compton effect in the region of the delta(1236)-resonance

Genzel, H. ; Jung, M. ; Rausch, K.R. ; et al.
Lett.Nuovo Cim. 4S2 (1972) 695-698, 1972.
Inspire Record 77720 DOI 10.17182/hepdata.37338

None

6 data tables match query

No description provided.

No description provided.

No description provided.

More…

Elastic Scattering of 247-MeV Gamma Rays on Hydrogen

Baranov, P.S. ; Slovokhotov, L.I. ; Shtarkov, L.N. ; et al.
Sov.Phys.JETP 14 (1962) 1219-1224, 1962.
Inspire Record 1387794 DOI 10.17182/hepdata.39914

The angular distribution of 24 7 ± 10 Mev gamma rays produced in the synchrotron of the Lebedev Physics Institute, which were scattered elastically on hydrogen, has been investigated. Differential cross sections were obtained for c.m. scattering angles of 148, 132, 108, 93, 70, and 55°. The experimental results are compared with calculations based on onedimensional dispersion relations with an additional contribution from a single-meson intermediate state taken into account.

1 data table match query

No description provided.


Refinement of the Experimental Values of the Compton-effect Cross Sections forthe Proton

Baranov, P.S. ; Slovokhotov, L.I. ; Sokol, G.A. ; et al.
Sov.Phys.JETP 23 (1966) 242-243, 1966.
Inspire Record 1387582 DOI 10.17182/hepdata.39965

The values of the differential cross sections for the Compton effect on the proton are given for $\gamma$-quantum energies from ~230 to ~250 MeV. These values of the cross sections are the result of a more accurate analysis and of making absolute the experimental data obtained by us earlier.

1 data table match query

No description provided.


Elastic scattering of low energy photons by protons and electromagnetic polarizability of proton

Baranov, P.S. ; Buinov, G.M. ; Godin, V.G. ; et al.
Pisma Zh.Eksp.Teor.Fiz. 19 (1974) 777-780, 1974.
Inspire Record 96876 DOI 10.17182/hepdata.70437

None

1 data table match query

No description provided.


Proton Compton Effect for 300-MeV Photons

Gray, E.R. ; Hanson, A.O. ;
Phys.Rev. 160 (1967) 1212-1215, 1967.
Inspire Record 944949 DOI 10.17182/hepdata.26568

The scattering of photons by protons has been measured with a spark-chamber technique using 335-MeV bremsstrahlung. The experimental values obtained at 90° and 135° are compared with those calculated by Contogouris using dispersion relations. The agreement is reasonable except for a persistently low point for 310 MeV at 90°.

1 data table match query

No description provided.


Compton scattering by the proton through Theta(CMS) = 75-degrees and 90-degrees in the Delta resonance region

Hünger, A ; Peise, J ; Robbiano, A ; et al.
Nucl.Phys.A 620 (1997) 385-416, 1997.
Inspire Record 458618 DOI 10.17182/hepdata.36349

Differential cross sections for Compton scattering by the proton have been measured in the energy interval between 200 and 500 MeV at scattering angles of θ cms = 75° and θ cms = 90° using the CATS, the CATS/TRAJAN, and the COPP setups with the Glasgow Tagger at MAMI (Mainz). The data are compared with predictions from dispersion theory using photo-meson amplitudes from the recent VPI solution SM95. The experiment and the theoretical procedure are described in detail. It is found that the experiment and predictions are in agreement as far as the energy dependence of the differential cross sections in the Δ-range is concerned. However, there is evidence that a scaling down of the resonance part of the M 1+ 3 2 photo-meson amplitude by (2.8 ± 0.9)% is required in comparison with the VPI analysis. The deduced value of the M 1+ 3 2 - photoproduction amplitude at the resonance energy of 320 MeV is: |M 1+ 3 2 | = (39.6 ± 0.4) × 10 −3 m π + −1 .

2 data tables match query

No description provided.

No description provided.


PROTON COMPTON EFFECT

Nagashima, Yorikiyo ;
INSJ-81, 1964.
Inspire Record 1101996 DOI 10.17182/hepdata.69229

None

1 data table match query

No description provided.


Elastic scattering of $\gamma$ rays by protons at energies above the $\pi$-meson photoproduction threshold

Baranov, P.S. ; Kuznetsova, V.A. ; Slovokhotov, L.I. ; et al.
Sov.J.Nucl.Phys. 3 (1966) 791-797, 1966.
Inspire Record 1392560 DOI 10.17182/hepdata.18996

None

2 data tables match query

No description provided.

No description provided.


NEUTRAL PION PHOTOPRODUCTION AND PROTON COMPTON SCATTERING AT LARGE ANGLES

Shupe, M.A. ; Milburn, Richard H. ; Quinn, D.J. ; et al.
Phys.Rev.D 19 (1979) 1921-1930, 1979.
Inspire Record 145744 DOI 10.17182/hepdata.24315

The differential cross sections for γp→γp and γp→π0p have been measured for incident photon energies in the range of 2 to 6 GeV and for |t| ranging from 0.7 to 4.3 GeV2. This corresponds to a center-of-mass angle range of 45° to 128°. The energy dependence of the data is compared to that predicted by several parton models.

5 data tables match query

No description provided.

No description provided.

No description provided.

More…

Total hadronic cross-section of gamma rays in hydrogen in the energy range 0.265-GeV to 4.215-GeV

Armstrong, T.A. ; Hogg, W.R. ; Lewis, G.M. ; et al.
Phys.Rev.D 5 (1972) 1640-1652, 1972.
Inspire Record 67298 DOI 10.17182/hepdata.22462

The total cross section of γ rays in hydrogen resulting in hadron production, σT, has been measured over the energy range 265-4215 MeV. A tagging system with narrow energy bins was employed. Structure in the resonance region followed by a steady fall with energy has been observed and the results are analyzed. The forward amplitude of γ-proton scattering is evaluated, and its behavior in the Argand diagram studied as a function of energy. The relationships of the measurements to Regge-pole theory and the vector-dominance model are detailed.

1 data table match query

SPIN AVERAGED FORWARD COMPTON SCATTERING AMPLITUDE. IM(AMP) WAS CALCULATED VIA THE OPTICAL THEOREM FROM A SMOOTH FIT TO THE DATA, AND USED IN THE DISPERSION RELATION TO CALCULATE RE(AMP). AT THRESHOLD THE THOMSON AMPLITUDE IS -3.0 MUB*GEV.


Quasi-free Compton Scattering and the Polarizabilities of the Neutron

Kossert, K. ; Camen, M. ; Wissmann, F. ; et al.
Eur.Phys.J.A 16 (2003) 259-273, 2003.
Inspire Record 599960 DOI 10.17182/hepdata.43752

Differential cross sections for quasi-free Compton scattering from the proton and neutron bound in the deuteron have been measured using the Glasgow/Mainz tagging spectrometer at the Mainz MAMI accelerator together with the Mainz 48 cm $\oslash$ $\times$ 64 cm NaI(Tl) photon detector and the G\"ottingen SENECA recoil detector. The data cover photon energies ranging from 200 MeV to 400 MeV at $\theta^{LAB}_\gamma=136.2^\circ$. Liquid deuterium and hydrogen targets allowed direct comparison of free and quasi-free scattering from the proton. The neutron detection efficiency of the SENECA detector was measured via the reaction $p(\gamma,\pi^+ n)$. The "free" proton Compton scattering cross sections extracted from the bound proton data are in reasonable agreement with those for the free proton which gives confidence in the method to extract the differential cross section for free scattering from quasi-free data. Differential cross sections on the free neutron have been extracted and the difference of the electromagnetic polarizabilities of the neutron have been obtained to be $\alpha-\beta= 9.8\pm 3.6(stat){}^{2.1}_1.1(syst)\pm 2.2(model)$ in units $10^{-4}fm^3$. In combination with the polarizability sum $\alpha +\beta=15.2\pm 0.5$ deduced from photoabsorption data, the neutron electric and magnetic polarizabilities, $\alpha_n=12.5\pm 1.8(stat){}^{+1.1}_{-0.6}\pm 1.1(model)$ and $\beta_n=2.7\mp 1.8(stat){}^{+0.6}_{-1.1}(syst)\mp 1.1(model)$ are obtained. The backward spin polarizability of the neutron was determined to be $\gamma^{(n)}_\pi=(58.6\pm 4.0)\times 10^{-4}fm^4$.

3 data tables match query

Energy dependence of the free-proton differential cross section.

Energy dependence of the quasi-free proton differential cross section.

Energy dependence of the free neutron differential cross section.