Gießen 2007 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 50: Elektromagnetische und Hadronische Sonden

HK 50.1: Talk

Thursday, March 15, 2007, 17:00–17:15, A

quark spin content of proton and the decay width of the Θ⁺ baryon — •ghil-seok yang¹, hyun-chul kim², maxim polyakov¹, and klaus goeke¹ — ¹Instituts für Theoretische Physik II, Ruhr-Universität Bochum, Germany — ²NuRI, Department of Physics, Pusan National University, Busan, Republic of Korea

Using the exisiting experimental data for hyperon semileptonic decays and the flavor-singlet axial-vector charge g_A⁽⁰⁾ from polarized deep inelastic scattering of the proton, we derive the decay width of the pentaquark baryon. We take into account the effects of flavor SU(3) symmetry breaking within the framework of the chiral quark-soliton model. All dynamical parameters of the model are fixed by using the five experimental hyperon semileptonic decay constants and flavor singlet axial-vector charge. We obtain the numerical results of the decay width of the Θ⁺ pentaquark baryon as a function of the sigma π N term and investigate the dependence of the decay width of the Θ⁺ on the g_A⁽⁰⁾, varying g_A⁽⁰⁾ within the range of the experimental uncertainty. It turns out that the decay width of the Θ⁺ is very sensitive to the singlet axial-vector charge. We discuss the constraint on the decay width of the Θ⁺ due to the flavor-singlet axial-vector charge and vice versa.