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44 papers · 1 filter
Photoproduction of Theta+ on the nucleon and deuteron
T. Mart, A. Salam, K. Miyagawa +1
Photoproduction of the pentaquark particle Theta^+ on the nucleon has been studied by using an isobar and a Regge model. Using the isobar model, total cross sections around 100 nb…
Comment on The Evidence for a Pentaquark and Kinematic Reflections
K. Hicks, V. Burkert, A. E. Kudryavtsev +2
The Regge exchange model used by Dzierba et al. is shown to be questionable, since the pion pole term is not allowed. Hence the Regge amplitudes in their calculation are exaggerate…
A categorification for the chromatic polynomial
Laure Helme-Guizon, Yongwu Rong
For each graph we construct graded cohomology groups whose graded Euler characteristic is the chromatic polynomial of the graph. We show the cohomology groups satisfy a long exact…
Missing Resonances in Kaon Photoproduction on the Nucleon
T. Mart, A. Sulaksono, C. Bennhold
New kaon photoproduction data on a proton, gamma + p --> K+ + Lambda, are analyzed using a multipole approach. The background terms are given in terms of gauge invariant, crossing…
Some aspects of parity determination in the reaction
A. I. Titov, H. Ejiri, H. Haberzettl +1
We analyze the problem of how to determine the parity of the pentaquark in the reaction , where . Our model calculations indicate that the contr…
Baryon magnetic moments in the external field method
F. X. Lee, R. Kelly, L. Zhou +1
We present a calculation of the magnetic moments of the baryon octet and decuplet using the external field method and standard Wilson gauge and fermion actions in the quenched appr…