Erratum to: Study of the reaction gammap --> K+Lambda(1520) at photon energies up to 2.65 GeV
F. W. WielandJ. BarthK.-H. GlanderJ. HannappelN. JöpenF. J. KleinE. KlemptR. LawallD. MenzeM. OstrickE. PaulI. SchuldayW. J. Schwille
0
Citation
0
Reference
19
Related Paper
Cite
Table (database)
Cite
Citations (0)
Isobar
Photon energy
Cite
Citations (92)
Cross sections for the reactions $\ensuremath{\gamma}p\ensuremath{\rightarrow}{K}^{+}\ensuremath{\Lambda}$ and $\ensuremath{\gamma}p\ensuremath{\rightarrow}{K}^{+}{\ensuremath{\Sigma}}^{0}$ have been measured at squared four-momentum transfer ($\ensuremath{-}t$) from 0.005 to 2 ${\mathrm{GeV}}^{2}$, at photon energies 5, 8, 11, and 16 GeV. For $\ensuremath{-}t>0.2$ ${\mathrm{GeV}}^{2}$ each of the ${K}^{+}$ cross sections is about ⅓ of the ${\ensuremath{\pi}}^{+}n$ photoproduction cross section, having nearly the same energy and momentum-transfer dependence. The ${K}^{+}$ cross sections fall off at small $|t|$, however, in contrast to the sharp forward spike seen in ${\ensuremath{\pi}}^{+}n$; this leads to a disagreement with an SU(3) prediction for $\ensuremath{-}t<0.1$ ${\mathrm{GeV}}^{2}$. The ratio of ${K}^{+}{\ensuremath{\Sigma}}^{0}$ to ${K}^{+}\ensuremath{\Lambda}$ cross sections is typically between 0.5 and 1.0.
Cite
Citations (74)
Table (database)
Cite
Citations (0)
DESY
Momentum (technical analysis)
Photon energy
Momentum transfer
Cite
Citations (11)
Helicity
Photon energy
Sigma
Flattening
Cite
Citations (5)
Sigma
Cite
Citations (43)
Polarization of $\ensuremath{\Lambda}$ hyperons and differential cross sections for the reaction $\ensuremath{\gamma}+p\ensuremath{\rightarrow}{K}^{+}+\ensuremath{\Lambda}$ were measured at the ${K}^{+}$-meson center-of-mass angles around 45\ifmmode^\circ\else\textdegree\fi{}, 70\ifmmode^\circ\else\textdegree\fi{}, and 90\ifmmode^\circ\else\textdegree\fi{} for the incident photon energies of 1054, 1100, and 1160 MeV. The ${K}^{+}$ mesons were detected with a magnetic spectrometer and a velocity-selection system based on the energy loss and the time of flight. The polarization of $\ensuremath{\Lambda}$ was determined by measuring the up-down asymmetry of protons in the decay $\ensuremath{\Lambda}\ensuremath{\rightarrow}p{\ensuremath{\pi}}^{\ensuremath{-}}$ with respect to the production plane. The results show a dominant $sin\ensuremath{\theta}_{K}^{}{}_{}{}^{*}$ dependence of the polarization at the region of the third resonance and are consistent with a contribution of the ${P}_{11}$ resonance with a mass of about 1700 MeV.
Cite
Citations (23)
Cite
Citations (0)