Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-12-09
Phys.Rev.C83:025207,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
Accepted by Physical Review C, 11 Pages, 8 Figures; fixed figure and reference formats per PRC
Scientific paper
10.1103/PhysRevC.83.025207
Recent cross section data for the reaction gamma + p \to K^+ + Lambda are examined for evidence of scaling in both the low-t Regge domain and in the high \sqrt{s} and -t domain where constituent counting may apply. It is shown that the reaction does scale in both regimes. At large center of mass angles, s^{-7} scaling appears to hold at essentially all -t, but with angle-dependent oscillations. The scaled data show particularly strong evidence for s-channel resonances for -t below 2 GeV^2 and for W below about 2.3 GeV. The dominant contributions are consistent with an N^* S_{11} resonance at 1690 MeV, a P_{13} at 1920 MeV, and a D_{13} resonance at 2100 MeV, which interfere to give the observed strong angular dependence.
Sargsian Misak M.
Schumacher Reinhard A.
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