Cross Sections and Beam Asymmetries for K+ Sigma*- photoproduction from the deuteron at 1.5-2.4 GeV

Abstract

The $\Sigma (1385)$ resonance, or ${\Sigma }^{\ast }$, is well-known as part of the standard baryon decuplet with spin $J=3/2$. Measurements of the reaction $\gamma p\to K^{+}{\Sigma }^{\ast 0}$ are difficult to extract due to overlap with the nearby $\Lambda (1405)$ resonance. However, the reaction $\gamma n\to K^{+}{\Sigma }^{\ast -}$ has no overlap with the $\Lambda (1405)$ due to its charge. Here we report the first measurement of cross sections and beam asymmetries for photoproduction of the \sigs from a deuteron target. % where the $K^{+}$ and ${\pi }^{-}$ are detected in the LEPS spectrometer. The cross sections at forward angles range from 0.4 to 1.2 $\mu$b, with a broad maximum near $E_{\gamma }\simeq 1.8$ GeV. The beam asymmetries are negative, in contrast to postive values for the $\gamma n\to K^{+}{\Sigma }^{-}$ reaction.

arXiv commentaccepted in Phys. Rev. Lett

References in corpus (9)

• The Cosmological Parameters 2006
• Big-Bang nucleosynthesis (Particle Data Group mini-review)
• Strange Decays of Nonstrange Baryons
• The gamma + p to K+ + Lambda and gamma + p to K+ + Sigma0 reactions at forward angles with photon energies from 1.5 to 2.4 GeV
• Photoproduction of Lambda(1405) and Sigma^{0}(1385) on the proton at E_γ= 1.5-2.4 GeV
• Chiral dynamics in the gamma p --> pi^0 eta p and gamma p --> pi^0 K^0 Sigma^+ reactions
• Nucleon and Delta resonances in K Sigma(1385) photoproduction from nucleons
• Differential cross section and photon beam asymmetry for the gamma n -> K+ Sigma- reaction at Egamma=1.5-2.4 GeV
• The associated photoproduction of positive kaons and ${\pi }^0\Lambda$ or $\pi \Sigma$ pairs in the region of the $\Sigma$(1385) and $\Lambda$(1405) resonances

Cited by in corpus (19)

• Baryon spectroscopy
• Differential Photoproduction Cross Sections of the Sigma0(1385), Lambda(1405), and Lambda(1520)
• Near-threshold Lambda(1520) production by the gamma p -> K+Lambda(1520) reaction at forward K+ angles
• Evidence for a new ${\Sigma }^{\ast }$ resonance with $J^P=1/2^{-}$ in the old data of $K^{-}p\to \Lambda {\pi }^{+}{\pi }^{-}$ reaction
• Possible $\Sigma ({\frac{1}{2}}^{-})$ under the ${\Sigma }^{\ast }(1385)$ peak in $K{\Sigma }^{\ast }$ photoproduction
• Five-quark components in baryons
• Lambda(1520) photoproduciton off the proton target with Regge contributions
• Hadron spectroscopy from strangeness to charm and beauty
• Review of the low-lying excited baryons ${\Sigma }^{\ast }(1/2^{-})$
• Analysis of recent CLAS data on ${\Sigma }^{\ast }(1385)$ photoproduction off a neutron target
• Possible ${\Sigma }^{\ast }(1/2^{-})$ in the initial-state polarized $\gamma N\to K^{+}{\Sigma }^{\ast }(1385)\to K^{+}\pi \Lambda$ reaction near threshold
• Differential cross section and photon beam asymmetry for the gamma p -> pi+ n reaction at forward pi+ angles at Egamma=1.5-2.95 GeV
• Photoproduction of $K^{+}{K}^{-}$ meson pairs on the proton
• Photo-production of lowest ${\Sigma }_{1/2^{-}}^{\ast }$ state within the Regge-effective Lagrangian approach
• Analysis of the $\gamma n\to K^{+}{\Sigma }^{-}(1385)$ photoproduction
• Photoproduction of $\gamma N\to K^{+}{\Sigma }^{\ast }(1385)$ in the Reggeized framework
• Evidence for a $\bar{K}NN$ quasi-bound state in the $\gamma d\to K^0\Lambda p$ reaction
• Penta-quark States with Strangeness, Hidden Charm and Beauty
• Monitoring the build-up of hydrogen polarization for polarized Hydrogen-Deuteride (HD) targets with NMR at 17 Tesla