Five-quark components in baryons

D. O. Riska

doi:10.1088/1674-1137/34/9/010

Chinese Physics C> 2010, Vol. 34> Issue(9) : 1201-1204 DOI: 10.1088/1674-1137/34/9/010

Five-quark components in baryons

D. O. Riska ^,

Helsinki Institute of Physics, POB 64, FIN-00014 University of Helsinki, Finland

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Abstract：
While several experiments based on the Drell-Yan process have revealed the presence
of light antiquarks in the proton, the experimental signatures for strange quark components remain consistent with 0. Phenomenological studies of meson photoproduction on nucleons with hadronic models indicate that the underprediction of the NΔ transition strengths by the three quark model may be attributed to the missing ``meson cloud" contributions. If qqqqq configurations are included in the baryon wave functions the conclusions that emerge are that (a) a combination of at least three different qqqqq configurations are required for a satisfactory description of the nucleon properties and (b) that the vanishing of the axial form factor of the N(1535) resonance is a natural consequence of the cancellation of the contributions of the qqq and qqqqq configurations.

References

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D. O. Riska. Five-quark components in baryons[J]. Chinese Physics C, 2010, 34(9): 1201-1204. doi: 10.1088/1674-1137/34/9/010

D. O. Riska. Five-quark components in baryons[J]. Chinese Physics C, 2010, 34(9): 1201-1204. doi: 10.1088/1674-1137/34/9/010 shu

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Received: 2010-02-09
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沈阳化工大学材料科学与工程学院沈阳 110142

Five-quark components in baryons

Corresponding author: D. O. Riska,

Helsinki Institute of Physics, POB 64, FIN-00014 University of Helsinki, Finland

Received Date: 2010-02-09

Accepted Date: 1900-01-01

Available Online: 2010-09-05

Abstract:

While several experiments based on the Drell-Yan process have revealed the presence
of light antiquarks in the proton, the experimental signatures for strange quark components remain consistent with 0. Phenomenological studies of meson photoproduction on nucleons with hadronic models indicate that the underprediction of the NΔ transition strengths by the three quark model may be attributed to the missing ``meson cloud" contributions. If qqqqq configurations are included in the baryon wave functions the conclusions that emerge are that (a) a combination of at least three different qqqqq configurations are required for a satisfactory description of the nucleon properties and (b) that the vanishing of the axial form factor of the N(1535) resonance is a natural consequence of the cancellation of the contributions of the qqq and qqqqq configurations.

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Five-quark components in baryons

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