Experimental studies of the Σ, T, P polarization parameters and the γp→pπ0 reaction multipole analysis in the first resonance region

Neutral pion photoproduction on the nucleon in a chiral quark model

“…Their strong effects on the polarization observables can be seen obviously as well. [84] (right triangles), [83] (open up triangles), [85] (open diamonds), [11] (solid diamonds), [13] (down triangles), [86] (open circles), [14] (solid squares), [87] (solid circles), and [88] (open squares). The results by switching off the contributions from various partial waves are indicated explicitly by different legends in the figure. in the third resonance region.…”

“…To clearly see the contributions from different partial waves, we plot the energy dependent differential cross sections in Fig. 12 [91](solid circles), [92] (diamonds), [93] (solid down triangles), [94] (solid stars), [95] (open stars), [96] (solid squares), [85] (solid up triangles), [97] (solid left triangles), [98] (open down triangles), and [99] (solid right triangles). The results by switching off the contributions from various partial waves are indicated explicitly by different legends in the figure.…”

“…Below the photon energy E γ ≃ 700 MeV, only a few old data with a very small angle coverage were obtained. Recently, some precise data with larger angle coverage in the higher The data are taken from [5] (solid left triangles), [83] (open squares), [84] (open up triangles), [85] (solid circles), [11] (solid squares), [13] (diamonds), [86] (solid down triangles), [14] (stars). The first and second number in each figure correspond to the photon energy E γ (MeV) and the πN center-of-mass energy W (MeV), respectively.…”

Decays of baryon resonances into ΛK+, ΣK+ and Σ+K0

“…The data on ΛK + and ΣK were fitted jointly with data on π 0 and η photoproduction (see Table 1). Included were the differential cross section for π 0 and η production from CB-ELSA [33,34], the Mainz-TAPS data [35] on η photoproduction, cross sections for π 0 and η photoproduction from GRAAL and beam asymmetry measurements [36, 37,38], and data on γp → nπ + [39]. The different data sets enter the fits with weights which are listed in the fifth column of Table 1.…”

Nucleon-nucleon interaction and meson exchange current effects in3He two-body breakup by polarized photons

“…proton emission angle of 90 ~ Recently, the data on the ;~ 3He ~ p d cross sections have been extended through experiments with polarized photons at the Kharkov electron linac [9,10].…”