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首页> 外文期刊>Physical review, D. Particles, fields, gravitation, and cosmology >Determination of exotic hadron structure by constituent-counting rule for hard exclusive processes
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Determination of exotic hadron structure by constituent-counting rule for hard exclusive processes

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摘要

We propose to use hard exclusive production of an exotic hadron for finding its internal quark-gluon configuration by the constituent-counting rule in perturbative QCD. In particular, the cross section for the exclusive process π~-+p→K0+Λ(1405) is estimated at the scattering angle θ=90 in the center-of-mass frame by using current experimental data. In comparison, the cross section for the ground-state Λ production π~-+p→K0+Λ is also shown. We suggest that the internal quark configuration of Λ(1405) should be determined by the asymptotic scaling behavior of the cross section. If it is an ordinary three-quark baryon, the scaling of the cross section is s8dσ/dt=constant, whereas it is s10dσ/dt=constant if Λ(1405) is a five-quark hadron, where s and t are Mandelstam variables. Such a measurement will be possible, for example, by using the high-momentum beam line at Japan Proton Accelerator Research Complex. In addition, another exclusive process γ+p→K~++Λ (1405) could be investigated at laser electron photon beam line at SPring-8 and JLab for finding the nature of Λ(1405). We indicate that the constituent-counting rule could be used as a valuable quantity in determining internal structure of exotic hadrons by high-energy exclusive processes, where quark-gluon degrees of freedom explicitly appear. Furthermore, it is interesting to investigate the transition from hadron degrees of freedom to quark-gluon ones for exclusive exotic-hadron production processes.

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