pi0 photoproduction on the proton for photon energies from 0.675-GeV to 2.875-GeV.

Dugger, M. ; Ritchie, Barry G. ; Ball, J.P. ; et al.
Phys.Rev.C 76 (2007) 025211, 2007.
Inspire Record 749989 DOI 10.17182/hepdata.51855

Differential cross sections for the reaction $\gamma p \to p \pi^0$ have been measured with the CEBAF Large Acceptance Spectrometer (CLAS) and a tagged photon beam with energies from 0.675 to 2.875 GeV. The results reported here possess greater accuracy in the absolute normalization than previous measurements. They disagree with recent CB-ELSA measurements for the process at forward scattering angles. Agreement with the SAID and MAID fits is found below 1 GeV. The present set of cross sections has been incorporated into the SAID database, and exploratory fits have been extended to 3 GeV. Resonance couplings have been extracted and compared to previous determinations.

45 data tables

Differential cross section for indicent photon energy 675 MeV.

Differential cross section for indicent photon energy 725 MeV.

Differential cross section for indicent photon energy 775 MeV.

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Cascade production in the reactions gamma p --> K+ K+ (X) and gamma p --> K^+ K^+ pi- (X)

Guo, L. ; Weygand, D.P. ; Battaglieri, M. ; et al.
Phys.Rev.C 76 (2007) 025208, 2007.
Inspire Record 744487 DOI 10.17182/hepdata.31494

Photoproduction of the cascade resonances has been investigated in the reactions $\gamma p \to K^+ K^+ (X)$ and $\gamma p \to K^+ K^+ \pi^- (X)$. The mass split of the $\Xi$ doublet is measured to be $5.4\pm 1.8$ MeV/c$^2$, consistent with existing measurements. The differential (total) cross sections for the $\Xi^{-}$ have been determined for photon beam energies from 2.75 to 3.85 (4.75) GeV, and are consistent with a possible production mechanism of $Y^*\to K^+\Xi^-$ through a $t$-channel process. The reaction $\gamma p \to K^+ K^+ \pi^-[\Xi^0]$ has also been investigated in search of excited cascade resonances. No significant signal of excited cascade states other than the $\Xi^-(1530)$ is observed. The cross section results of the $\Xi^-(1530)$ have also been obtained for photon beam energies from 3.35 to 4.75 GeV.

47 data tables

Differential cross section for XI- production as a function of the invariant mass of the XI- with either of the K+ mesons for incident photon energy 2.79 Gev.

Differential cross section for XI- production as a function of the invariant mass of the XI- with either of the K+ mesons for incident photon energy 2.89 Gev.

Differential cross section for XI- production as a function of the invariant mass of the XI- with either of the K+ mesons for incident photon energy 2.99 Gev.

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Cross Sections for the $\gamma p \to K^{*0}\Sigma^+$ Reaction at $E_\gamma = 1.7 - 3.0$ GeV

The CLAS collaboration Hleiqawi, I. ; Hicks, K. ; Carman, D.S. ; et al.
Phys.Rev.C 75 (2007) 042201, 2007.
Inspire Record 742894 DOI 10.17182/hepdata.52647

Differential cross sections for the reaction $\gamma p \to K^{*0} \Sigma^+$ are presented at nine bins in photon energy in the range from 1.7 to 3.0 GeV. The \kstar was detected by its decay products, $K^+\pi^-$, in the CLAS detector at Jefferson Lab. These data are the first \kstar photoproduction cross sections ever published over a broad range of angles. Comparison with a theoretical model based on the vector and tensor $K^*$-quark couplings shows good agreement with the data in general, after adjusting the model's two parameters in a fit to our data. Disagreement between the data at forward angles and the global angle-energy fit to the model suggests that the role of scalar $\kappa$ meson exchange in $t$-channel diagrams should be investigated.

2 data tables

Cross sections with total uncertainties.

Cross sections with total uncertainties.


eta' photoproduction on the proton for photon energies from 1.527-GeV to 2.227-GeV.

The CLAS collaboration Dugger, M. ; Ball, J.P. ; Collins, P. ; et al.
Phys.Rev.Lett. 96 (2006) 062001, 2006.
Inspire Record 700399 DOI 10.17182/hepdata.31553

Differential cross sections for the reaction gamma p -> eta-prime p have been measured with the CLAS spectrometer and a tagged photon beam with energies from 1.527 to 2.227 GeV. The results reported here possess much greater accuracy than previous measurements. Analyses of these data indicate for the first time the coupling of the etaprime N channel to both the S_11(1535) and P_11(1710) resonances, known to couple strongly to the eta N channel in photoproduction on the proton, and the importance of j=3/2 resonances in the process.

5 data tables

Differential cross sections for ETAPRIME photoproduction on the proton at photon energies 1.527, 1.577 and 1.627 GeV. The errors shown are combined statistical and systematic.

Differential cross sections for ETAPRIME photoproduction on the proton at photon energies 1.677, 1.728 and 1.779 GeV. The errors shown are combined statistical and systematic.

Differential cross sections for ETAPRIME photoproduction on the proton at photon energies 1.829, 1.879 and 1.930 GeV. The errors shown are combined statistical and systematic.

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Deeply virtual and exclusive electroproduction of omega mesons.

The CLAS collaboration Morand, L. ; Dore, D. ; Garcon, M. ; et al.
Eur.Phys.J.A 24 (2005) 445-458, 2005.
Inspire Record 681604 DOI 10.17182/hepdata.43499

The exclusive omega electroproduction off the proton was studied in a large kinematical domain above the nucleon resonance region and for the highest possible photon virtuality (Q2) with the 5.75 GeV beam at CEBAF and the CLAS spectrometer. Cross sections were measured up to large values of the four-momentum transfer (-t < 2.7 GeV2) to the proton. The contributions of the interference terms sigma_TT and sigma_TL to the cross sections, as well as an analysis of the omega spin density matrix, indicate that helicity is not conserved in this process. The t-channel pi0 exchange, or more generally the exchange of the associated Regge trajectory, seems to dominate the reaction gamma* p -> omega p, even for Q2 as large as 5 GeV2. Contributions of handbag diagrams, related to Generalized Parton Distributions in the nucleon, are therefore difficult to extract for this process. Remarkably, the high-t behaviour of the cross sections is nearly Q2-independent, which may be interpreted as a coupling of the photon to a point-like object in this kinematical limit.

85 data tables

Total cross sections and interference terms (TT and TL).

Differential cross sections DSIG/DT for Q**2 = 1.725 GeV**2 and W = 2.77 GeV.

Differential cross sections DSIG/DT for Q**2 = 1.752 GeV**2 and W = 2.48 GeV.

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Exclusive photoproduction of the Cascade (Xi) hyperons.

The CLAS collaboration Price, J.W. ; Nefkens, B.M.K. ; Ducote, J.L. ; et al.
Phys.Rev.C 71 (2005) 058201, 2005.
Inspire Record 660705 DOI 10.17182/hepdata.25222

We report on the first measurement of exclusive Xi-(1321) hyperon photoproduction in gamma p --> K+ K+ Xi- for 3.2 < E(gamma) < 3.9 GeV. The final state is identified by the missing mass in p(gamma,K+ K+)X measured with the CLAS detector at Jefferson Laboratory. We have detected a significant number of the ground-state Xi-(1321)1/2+, and have estimated the total cross section for its production. We have also observed the first excited state Xi-(1530)3/2+. Photoproduction provides a copious source of Xi's. We discuss the possibilities of a search for the recently proposed Xi5-- and Xi5+ pentaquarks.

1 data table

Cross section averaged over the energy range 3.2 to 3.9 GeV.


Complete angular distribution measurements of two-body deuteron photodisintegration between 0.5-GeV and 3-GeV.

The CLAS collaboration Mirazita, M. ; Ronchetti, F. ; Rossi, P. ; et al.
Phys.Rev.C 70 (2004) 014005, 2004.
Inspire Record 650821 DOI 10.17182/hepdata.31633

Nearly complete angular distributions of the two-body deuteron photodisintegration differential cross section have been measured using the CLAS detector and the tagged photon beam at JLab. The data cover photon energies between 0.5 and 3.0 GeV and center-of-mass proton scattering angles 10-160 degrees. The data show a persistent forward-backward angle asymmetry over the explored energy range, and are well-described by the non-perturbative Quark Gluon String Model.

4 data tables

Angular distributions of the photodisintegration cross section for angle between 10 and 50 degrees in the CM.

Angular distributions of the photodisintegration cross section for angle between 50 and 90 degrees in the CM.

Angular distributions of the photodisintegration cross section for angle between 90 and 130 degrees in the CM.

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Delbrueck scattering at energies 140-MeV to 450-MeV.

Akhmadalev, S.Z. ; Kezerashvili, G.Ya. ; Klimenko, S.G. ; et al.
BUDKER-INP-1998-51, 1998.
Inspire Record 472470 DOI 10.17182/hepdata.50144

The differential cross section of Delbr\"{u}ck scattering is measured on a bismuth germanate $Bi_4Ge_3O_{12}$ target at photon energies $140 - 450 MeV$ and scattering angles $2.6 - 16.6 mrad$. A good agreement with the theoretical results, obtained exactly in a Coulomb field, is found.

1 data table

Axis error includes +- 1.5/1.5 contribution (Error of measurement of the initial photons intensity).


Inclusive parton cross-sections in photoproduction and photon structure

The H1 collaboration Ahmed, T. ; Aid, S. ; Andreev, V. ; et al.
Nucl.Phys.B 445 (1995) 195-218, 1995.
Inspire Record 394176 DOI 10.17182/hepdata.44975

Photoproduction of 2-jet events is studied with the H1 detector at HERA. Parton cross sections are extracted from the data by an unfolding method using leading order parton-jet correlations of a QCD generator. The gluon distribution in the photon is derived in the fractional momentum range $0.04\le x_\gamma \le 1$ at the average factorization scale $75$ GeV$~2$.

3 data tables

No description provided.

No description provided.

Gluon density of the photon (alpha is the fine structure constant).


Measurement of the Cross-section of Photofission and Electrofission of $^{235}$U and $^{238}$U in the Energy Range 1.33-{GeV} to 4.32-{GeV}

Arakelian, E.A. ; Bayatian, H.L. ; Grigorian, N.K. ; et al.
Sov.J.Nucl.Phys. 49 (1989) 780, 1989.
Inspire Record 271539 DOI 10.17182/hepdata.47251

None

1 data table

No description provided.


E+ E- PAIR PRODUCTION BY A SYNCHROTRON RADIATION PHOTON ON A COUNTER BEAM ELECTRON. (IN RUSSIAN)

Blinov, A.E. ; Bondar, A.F. ; Bukin, A.D. ; et al.
Yad.Fiz. 45 (1987) 1008-1014, 1987.
Inspire Record 256613 DOI 10.17182/hepdata.17424

None

3 data tables

Axis error includes +- 2/2 contribution (Error in counter efficiency determination).

Electron momentum distribution.

Electron-positron pairs mass distribution.


HADRONIC PHOTOABSORPTION AND THE COHERENT PHOTOPRODUCTION OF PI0 MESONS ON BE AND C NUCLEI IN THE RESONANCE ENERGY REGION. (IN RUSSIAN)

Ananikian, A.K. ; Arakelian, E.A. ; Bayatian, G.L. ; et al.
Yad.Fiz. 46 (1987) 401-403, 1987.
Inspire Record 255687 DOI 10.17182/hepdata.17423

None

2 data tables

No description provided.

No description provided.


Cross-sections and Some Features of Charm Photoproduction at $\gamma$ Energies of 20-{GeV} to 70-{GeV}

The Photon Emulsion collaboration Adamovich, M.I. ; Aleksandrov, Yu.A. ; Bolta, J.M. ; et al.
Phys.Lett.B 187 (1987) 437-441, 1987.
Inspire Record 230940 DOI 10.17182/hepdata.30199

We report some results on charm photoproduction at γ energies ranging from 20 to 70 GeV. 36 events with pairs of charmed particles have been found in emulsions. The computed total cross section is (230±57)nb/nucleon. Frequencies of different production channels and some distributions are presented and compared with the predictions from a photon-gluon fusion model with string fragmentation.

1 data table

No description provided.


TOTAL CROSS-SECTION OF PI0 MESON AND HADRON PHOTOPRODUCTION ON Be, C, O, AND Al NUCLEI IN THE ENERGY RANGE E (GAMMA) = 200-MEV - 900-MEV. (IN RUSSIAN)

Arakelian, E.A. ; Bayatian, G.L. ; Vartanian, G.S. ; et al.
Yad.Fiz. 42 (1985) 3-7, 1985.
Inspire Record 227726 DOI 10.17182/hepdata.17616

None

3 data tables

No description provided.

No description provided.

No description provided.


PHOTOPRODUCTION OF SINGLE PIONS FROM NUCLEI AND PION ABSORPTION IN THE NUCLEAR CORE. (IN RUSSIAN)

Tonapetian, S.G. ; Khvorostian, V.M. ; Vinokurov, E.A. ;
Ukr.Fiz.Zh.(Russ.Ed.) 30 (1985) 679-682, 1985.
Inspire Record 220211 DOI 10.17182/hepdata.18516

None

1 data table

No description provided.


Pion Pair Production From $\gamma \gamma$ Interactions at {PEP} and the Radiative Width of the F0 Meson

The DELCO collaboration Courau, A. ; Johnson, R.P. ; Sherman, S.S. ; et al.
Phys.Lett.B 147 (1984) 227-231, 1984.
Inspire Record 202552 DOI 10.17182/hepdata.30498

Results are presented of an untagged e + e − → e + e − + π + π − experiment performed at PEP with the DELCO detector. In the invariant-mass range 0.7 ⩽ W ππ < 2.0 GeV/ c 2 , the QED e + e − background is identified and eliminated, and both the π + π − predictions and the μ + μ − and K + K − background substractions are normalized to the measurement of the e e + e − events. The results agree with a simple model of superposition and interference of the f 0 (1270) resonance, produced with helicity 2, with a Born-term continuum. From a fit of the model to the data, the radiative width of the f 0 is determined to be Γ f 0 → γγ = 2.70 ± 0.21 keV.

1 data table

Data read from graph.


No description provided.

No description provided.


TOTAL CROSS-SECTION OF HADRON PHOTOPRODUCTION ON Be, C, H2O AND Al NUCLEI IN THE ENERGY RANGE E (gamma) = 200-MeV TO 900-MeV

Arakelian, E.A. ; Bayatian, G.L. ; Grigorian, N.K. ; et al.
EFI-730-45-84-YEREVAN, 1984.
Inspire Record 206946 DOI 10.17182/hepdata.2700

None

2 data tables

No description provided.

No description provided.


STRUCTURE FUNCTIONS OF THE NUCLEI C-12, Cu-63, Pb-208 IN THE CUMULATIVE PROTON PHOTOPRODUCTION

Alanakian, K.V. ; Amarian, M.J. ; Demirchyan, R.A. ; et al.
Yad.Fiz. 41 (1985) 353-356, 1985.
Inspire Record 201858 DOI 10.17182/hepdata.18443

None

2 data tables

No description provided.

MISPRINT IN TAB.1 IN YV AT XV=0.763, CORRECTED BY VVE FROM GRAPH.


COMPTON EFFECT ON pi- MESON

Antipov, Yu.M. ; Batarin, V.A. ; Bessubov, V.A. ; et al.
Z.Phys.C 24 (1984) 39, 1984.
Inspire Record 193860 DOI 10.17182/hepdata.41183

The reaction π−A→Aπ− γ at 40 GeV/c was studied on “Sigma” spectrometer on six different nuclear targets in the region of four-momentum transfer |t|<0.05 (GeV/c)2. A phenomenon of elastic scattering of pions on the nuclear Coulomb field photons was observed, its total and differential cross sections were measured. The cross section of Compton effect on π−-meson was measured.

6 data tables

No description provided.

No description provided.

No description provided.

More…

Axis error includes +- 0.0/0.0 contribution (?////NOT GIVEN).

Axis error includes +- 0.0/0.0 contribution (?////NOT GIVEN).


No description provided.


Angular Dependence of the Yield of Cumulative Protons Produced in $\gamma$ a Interactions at $e (\gamma$) Max = 4.5-{GeV}

Alanakian, K.V. ; Amarian, M.D. ; Demirchyan, R.A. ; et al.
Sov.J.Nucl.Phys. 37 (1983) 385, 1983.
Inspire Record 180824 DOI 10.17182/hepdata.17713

None

1 data table

No description provided.


A-DEPENDENCE OF THE YIELD OF DEUTERON INCLUSIVE PHOTOPRODUCTION ON NUCLEI

Alanakian, K.V. ; Amarian, M.D. ; Demirchyan, R.A. ; et al.
EFI-490-33-81-YEREVAN, 1981.
Inspire Record 168420 DOI 10.17182/hepdata.18467

None

4 data tables

No description provided.

No description provided.

No description provided.

More…

A-DEPENDENCE OF CUMULATIVE PHOTOPROTONS

Alanakian, K.V. ; Amarian, M.D. ; Demirchyan, R.A. ; et al.
EFI-471-14-81-YEREVAN, 1981.
Inspire Record 167330 DOI 10.17182/hepdata.18454

None

3 data tables

No description provided.

No description provided.

No description provided.


A-dependence of Inclusive $\pi^\pm$ Meson Photoproduction

Alanakian, K.V. ; Amarian, M.D. ; Demirchyan, R.A. ; et al.
Sov.J.Nucl.Phys. 34 (1981) 50, 1981.
Inspire Record 159969 DOI 10.17182/hepdata.18445

None

3 data tables

No description provided.

No description provided.

No description provided.


POLARIZATION OF RECOIL PROTONS FROM THE REACTION GAMMA P ---> PI0 P IN THE PHOTON ENERGY RANGE 450-MEV - 800-MEV

Bratashevsky, A.S. ; Gorbenko, V.G. ; Derebchinsky, A.I. ; et al.
Nucl.Phys.B 166 (1980) 525-533, 1980.
Inspire Record 157933 DOI 10.17182/hepdata.34552

Measurement of secondary-proton polarization from the reaction γ p → π 0 p have been performed in the proton energy range 500–800 MeV at c.m. pion emission angles 100°, 120°, 140°. The experiment was carried out using an optical spark chamber telescope at the output of the magnetic spectrometer. The obtained experimental data are included in a Walker-type analysis in order to verify the parameters of the resonances P 11 (1470), D 13 (1570) and S 11 (1535). Proton polarization in the reaction γ p → π 0 p was measured for a photon energy of 450 MeV at a c.m. pion emission angle of 105° using photons linearly polarized at 45° to the reaction plane. A liquid hydrogen target in the field of a superconducting magnet was used for the separation of the P x ′ and P z ′ components of the secondary-proton polarization vector.

4 data tables

No description provided.

No description provided.

No description provided.

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ANGULAR DEPENDENCE OF LOW-ENERGY PI+- MESON YIELD. (IN RUSSIAN)

Alanakian, K.V. ; Amarian, M.Dzh. ; Demirchyan, R.A. ; et al.
Pisma Zh.Eksp.Teor.Fiz. 31 (1980) 381-384, 1980.
Inspire Record 157495 DOI 10.17182/hepdata.16994

None

3 data tables

No description provided.

No description provided.

No description provided.


Angular Dependence of Polarization of Secondary Protons from the Reaction gamma p --> pi0 p at Photon Energies of 650-MeV and 700-MeV

Zybalov, A.A ; Derebchinsky, A.I. ; Konovalov, O.G. ; et al.
Yad.Fiz. 28 (1978) 105-107, 1978.
Inspire Record 135481 DOI 10.17182/hepdata.18990

None

2 data tables

No description provided.

No description provided.


Proton Polarization in gamma p --> pi0 p Reaction at an Angle of Theta (pi) = 100-Degrees in CMS in the Second pi n Resonance Region

Derebchinsky, A.I. ; Zybalov, A.A ; Konovalov, O.G. ; et al.
Yad.Fiz. 28 (1978) 265-266, 1978.
Inspire Record 135482 DOI 10.17182/hepdata.19013

None

1 data table

No description provided.


Measurement of Total Cross-Sections of Hadron Photoproduction in C, Cu and Pb Nuclei at E(gamma) = 12-GeV to 30-GeV

Arakelian, E.A. ; Bayatian, G.L. ; Vartanian, G.S. ; et al.
Phys.Lett.B 79 (1978) 143-146, 1978.
Inspire Record 122947 DOI 10.17182/hepdata.27424

The total cross section of hadron photoproduction on C, Cu and Pb nuclei is measured for six energy values in the range 12–30 GeV. The obtained cross-section values for C and Cu nuclei have a weak energy dependence at high energies (above 20 GeV). The cross section for the Pb nucleus is somewhat higher in comparison with that expected, and energy dependence is not observed. The A -dependence of the effective number of hadrons agrees with VDM predictions.

2 data tables

No description provided.

A-EFFECTIVE/A = SIG(GAMMA A)/(Z*SIG(GAMMA P) + (A-Z)*SIG(GAMMA N)) WHERE SIG(GAMMA P) = (98.7 +- 3.6) + (65 +- 10)/SQRT(P) MUB, SIG(GAMMA N) = SIG(GAMMA P) - (18.3 +- 6.1)/SQRT(P) MUB AND A IS 12, 64 AND 207 FOR THESE NUCLEI.


Polarization of secondary protons from the gamma + p ---> pi0 + p reaction in the third resonance region

Derebchinskii, A.I. ; Tonapetyan, S.G. ; Konovalov, O.G. ; et al.
Zh.Eksp.Teor.Fiz. 66 (1974) 68-73, 1974.
Inspire Record 96653 DOI 10.17182/hepdata.39968

None

1 data table

No description provided.


On investigation of dependences of the yields of pions and protons, produced at theta(lab)=90 degrees at e(gamma)max=400 mev upon nucleus mass number

Goncharov, N.V. ; Derebchinskii, A.I. ; Konovalov, O.G. ; et al.
Yad.Fiz. 17 (1973) 242-249, 1973.
Inspire Record 85158 DOI 10.17182/hepdata.18374

None

5 data tables

No description provided.

No description provided.

No description provided.

More…

Polarization of protons produced in the gamma p ---> pi0 p reaction by 692-1028 mev photons at an angle of 90 degrees in the c.m.s

Goncharov, N.V. ; Derebchinskii, A.I. ; Zybalov, A.A. ; et al.
Zh.Eksp.Teor.Fiz. 64 (1973) 401-406, 1973.
Inspire Record 87241 DOI 10.17182/hepdata.39909

None

1 data table

No description provided.


Investigation of polarization of the photoprotons from the c-12 nucleus at the gamma-quanta energy of 550-715 mev

Goncharov, N.V. ; Derebchinskii, A.I. ; Zybalov, A.A. ; et al.
Yad.Fiz. 14 (1971) 673-675, 1971.
Inspire Record 69410 DOI 10.17182/hepdata.19273

None

2 data tables

No description provided.

No description provided.


Photoproduction of charged pi mesons on nuclei

Goncharov, N.V. ; Derebchinskii, A.I. ; Konovalov, O.P. ; et al.
Yad.Fiz. 14 (1971) 31-34, 1971.
Inspire Record 69453 DOI 10.17182/hepdata.18375

None

7 data tables

No description provided.

No description provided.

No description provided.

More…

Polarization of protons produced in interactions of 650-840 mev-photons with li-7 and c-12 nuclei

Tonapetyan, S.G. ; Konovalov, O.G. ; Derebchinskii, A.I. ; et al.
Pisma Zh.Eksp.Teor.Fiz. 11 (1970) 165-168, 1970.
Inspire Record 65490 DOI 10.17182/hepdata.19308

None

3 data tables