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Sorakrai Srisuphaphon Role of pentaquark components into meson production meson production proton-antiproton annihilation reactions proton-antiproton annihilation reactions

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Outline Introduction Introduction The proton wave functions with pentaquark component The proton wave functions with pentaquark component The transition amplitude for meson production in proton-antiproton annihilation reactions The transition amplitude for meson production in proton-antiproton annihilation reactions Results and Conclusions Results and Conclusions

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Introduction u u u u d d proton Baryons being bound states of three quarks. The proton might contain a substantial strange quark-antiquark component The proton might contain a substantial strange quark-antiquark component Deep Inelastic Scattering The non-zero strange spin of the proton The strangeness magnetic moment can be extrapolated from the strange magnetic form factor Several experimental measurements suggest a positive value for

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u u u u d d The presence of a uudss piece in the proton wave function.

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The proton wave functions with 5q component with pentaquark

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The corresponding spatial state labeled by

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spin flavor flavor-spin orbital color orbital-flavor-spin color singlet Construction of multiquark states in group theory.Construction of multiquark states in group theory. Y. Yan, S. Srisuphaphon Y. YanS. Srisuphaphon Prog.Part.Nucl.Phys. 67 (2012)

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orbital-flavor-spin color orbital

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flavor spin spatial

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Transition amplitude The transition amplitude for meson production in proton-antiproton annihilation reactions

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Choosing the plane wave basis for the relative motion of the proton and antiproton ( )

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spin-color-flavor weight are geometrical constants depending on the radial parameters

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Including the initial state interaction for the atomic state of the system The protonium wave function in momentum space for fixed isospin I

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The partial decay width for the transition of the state to the two-meson state statistical weight Branching ratio the partial decay width divided by the total width

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Reducing the model dependence Choosing a simplified phenomenological approach that has been applied in studies of two-meson branching ratios in nucleon- antinucleon and radiative protonium annihilation. we use a kinematical phase-space factor of the phenomenological form The initial-state interaction coefficients are related to the probability for a protonium state to have isospin I and spin J

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Transition Results The effective strength parameter has to be adjusted to data

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Transition

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Conclusions The model prediction only in the configuration of is agree well with the experimental data. Branching ratios

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Thank you for your attention

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