Photoproduction
Max results
Sort by Reverse order

Showing 10 of 1113 results

$J/\psi$ Photoproduction from 60-GeV/c to 300-GeV/c

Binkley, Morris E. ; Bohler, C. ; Butler, J. ; et al.
Phys.Rev.Lett. 48 (1982) 73, 1982.
Inspire Record 168767 DOI 10.17182/hepdata.20597

Measurements of the energy and t dependence of diffractive Jψ photoproduction are presented. A significant rise in the cross section over the energy range 60-300 GeV is observed. It is found that (30±4)% of the events are inelastic.

1 data table
Table 1

No description provided.


$K^+\Lambda$ and $K^+\Sigma^0$ photoproduction with fine center-of-mass energy resolution

The Crystal Ball at MAMI collaboration Jude, T.C. ; Glazier, D.I. ; Watts, D.P. ; et al.
Phys.Lett.B 735 (2014) 112-118, 2014.
Inspire Record 1250810 DOI 10.17182/hepdata.130796

Measurements of $\gamma p \rightarrow K^{+} \Lambda$ and $\gamma p \rightarrow K^{+} \Sigma^0$ cross-sections have been obtained with the photon tagging facility and the Crystal Ball calorimeter at MAMI-C. The measurement uses a novel $K^+$ meson identification technique in which the weak decay products are characterized using the energy and timing characteristics of the energy deposit in the calorimeter, a method that has the potential to be applied at many other facilities. The fine center-of-mass energy ($W$) resolution and statistical accuracy of the new data results in a significant impact on partial wave analyses aiming to better establish the excitation spectrum of the nucleon. The new analyses disfavor a strong role for quark-diquark dynamics in the nucleon.

26 data tables
K+L0_dcs01

Excitation function at cos(Theta_K+)cm = -0.8

K+L0_dcs02

Excitation function at cos(Theta_K+)cm = -0.7

K+L0_dcs03

Excitation function at cos(Theta_K+)cm = -0.6

More…

$K^0(s$) $K \pi$ Production in Tagged and Untagged $\gamma \gamma$ Interactions

The CELLO collaboration Behrend, H.J. ; Criegee, L. ; Dainton, J.B. ; et al.
Z.Phys.C 42 (1989) 367, 1989.
Inspire Record 266414 DOI 10.17182/hepdata.15529

We have searched for resonance production in the reaction γγ→Ks0Kπ. No signal was found for theηc and an upper limit for the radiative with\(\Gamma _{\gamma \gamma }^{\eta _c } \) keV (95% c.l.) is obtained. For the glueball candidate η(1440) (previouslyi) the upper limit\(\Gamma _{\gamma \gamma }^{\eta (1440)} B(\eta (1440) \to K\bar K\pi )< 1.2keV(95\% c.l.)\) is derived. In the tagged data sample resonance formation of a spin 1 state at 1420 MeV is observed, which is absent in the untagged data. The mass and width of this state are consistent with those of thef1(1420); an analysis of decay angular distributions favours positive parity.

1 data table
Table 1

Data read from graph.. Additional overall systematic error decreasing from 25% in the lowest mass bins to 15% for M > 2.0 GeV.


$\Lambda^{0}$ polarization from the reaction $\gamma + p=K^{+} + \Lambda^{0}$ in the energy range (950÷1050) MeV

Borgia, B. ; Grilli, M. ; Joos, P. ; et al.
Nuovo Cim. 32 (1964) 218-223, 1964.
Inspire Record 1185014 DOI 10.17182/hepdata.37674

None

1 data table
Table 1

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


$\Lambda^{0}$-polarization from the reaction $\gamma+p = \Lambda^{0}+K^{+}$ in the energy range (950÷1050)MeV

Grilli, M. ; Mezzetti, L. ; Nigro, M. ; et al.
Nuovo Cim. 38 (1965) 1467-1488, 1965.
Inspire Record 1185245 DOI 10.17182/hepdata.37616

We report some measurements of the Λ polarization in the reaction Υ+P=K+Λ+0, for 950<Eγ<1050 MeV. In Sects. 1 and 2 the experimental apparatus and the detection techniques used are described. In Sect.3 we discuss our results and those of other groups and compare them with the theoretical predictions.

1 data table
Table 1

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


$\pi^+$ Photoproduction Between 1.2 and 3 GeV at Very Small Angles

Buschhorn, G. ; Carroll, J. ; Eandi, R.D. ; et al.
Phys.Rev.Lett. 18 (1967) 571-574, 1967.
Inspire Record 52312 DOI 10.17182/hepdata.21767

The reaction γ+p→π++n has been investigated for photon energies between 1.2 and 3 GeV and pion c.m. angles from 2.5 to 15°. The cross section is strongly peaked in the forward direction and shows resonance structure in the region of the N32*(1920) and N12*(2190).

10 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

More…

$\pi^+$ photoproduction on the proton for photon energies from 0.725 to 2.875 GeV

The CLAS collaboration Dugger, M. ; Ritchie, B.G. ; Ball, J.P. ; et al.
Phys.Rev.C 79 (2009) 065206, 2009.
Inspire Record 814847 DOI 10.17182/hepdata.51952

Differential cross sections for the reaction $\gamma p \to n \pi^+$ have been measured with the CEBAF Large Acceptance Spectrometer (CLAS) and a tagged photon beam with energies from 0.725 to 2.875 GeV. Where available, the results obtained here compare well with previously published results for the reaction. Agreement with the SAID and MAID analyses is found below 1 GeV. The present set of cross sections has been incorporated into the SAID database, and exploratory fits have been made up to 2.7 GeV. Resonance couplings have been extracted and compared to previous determinations. With the addition of these cross sections to the world data set, significant changes have occurred in the high-energy behavior of the SAID cross-section predictions and amplitudes.

11 data tables
Table 1

Differential cross sections for incident photon energies 0.725, 0.775, 0.825and 0.875 GeV.

Table 2

Differential cross sections for incident photon energies 0.925, 0.975, 1.025and 1.075 GeV.

Table 3

Differential cross sections for incident photon energies 1.125, 1.175, 1.225and 1.275 GeV.

More…

$\pi^+$ production with linearly polarized photons

Geweniger, C. ; Heide, P. ; Kötz, U. ; et al.
Phys.Lett.B 29 (1969) 41-44, 1969.
Inspire Record 56795 DOI 10.17182/hepdata.29060

Single π + production on protons by linearly polarized photons of 2.5 to 5 GeV was measured at squared four momentum transfers t between −0.01 and −0.6 (GeV/ c ) 2 . The results show that the differential cross section d σ ⊥ d t with the electric vector of the photon perpendicular to the reaction plane is much larger than d σ ‖ d t with the electric vector parallel to the reaction plane. The predictions of Regge models and of the vector meson dominance model are briefly discussed.

3 data tables
Table 1

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

Table 2

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

Table 3

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


$\pi^\pm$ Meson Spectra in the Inclusive Reaction $\gamma C \to \pi X$ Caused by Bremsstrahlung $\gamma$ Quanta With the Maximum Energy 4.5-{GeV}

Alanakian, K.V. ; Amarian, M.D. ; Demirchyan, R.A. ; et al.
JETP Lett. 32 (1980) 652, 1980.
Inspire Record 158531 DOI 10.17182/hepdata.18460

None

1 data table
Table 1

DISTRIBUTIONS INTEGRATED WITH PHOTON SPECTRUM ARE NORMALIZED ON NUMBER OF EQUIVALENT PHOTONS.


$\pi^{0}$ PHOTOPRODUCTION FROM THE DEUTERON AT FORWARD ANGLES IN THE ENERGY RANGE FROM 900-MeV TO 1400-MeV

Clinesmith, Carl R. ; Tollestrup, Alvin V. ; Walker, Robert Lee ;
RX-184, 1967.
Inspire Record 51564 DOI 10.17182/hepdata.37172

The cross section for the reaction [...] was measured at the Caltech synchrotron. The [...] was detected by measuring its decay gamma rays with two lead glass, total absorption Cherenkov counters. The results are three angular distributions at k = 911, 1180, and 1390 MeV, at forward angles from 3 degrees to 90 degrees. The deuteron/proton ratio differs significantly from 2.0, but final state effects from the use of a deuteron target make impossible quantitative conclusions about the neutron cross section.

3 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.