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• W2072686486 abstract "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 $pi^- + p to K^0 + Lambda (1405)$ is estimated at the scattering angle $theta=90^circ$ in the center-of-mass frame by using current experimental data. In comparison, the cross section for the ground-state $Lambda$ production $pi^- + p to K^0 + Lambda$ is also shown. We suggest that the internal quark configuration of $Lambda (1405)$ 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 $s^{8} dsigma /dt=$constant, whereas it is $s^{10} dsigma /dt=$constant if $Lambda (1405)$ 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 beamline at J-PARC. In addition, another exclusive process $gamma + p to K^+ + Lambda (1405)$ could be investigated at LEPS and JLab for finding the nature of $Lambda (1405)$. 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." @default.
• W2072686486 created "2016-06-24" @default.
• W2072686486 creator A5007376623 @default.
• W2072686486 creator A5039203413 @default.
• W2072686486 creator A5091249560 @default.
• W2072686486 date "2013-08-07" @default.
• W2072686486 modified "2023-10-15" @default.
• W2072686486 title "Determination of exotic hadron structure by constituent-counting rule for hard exclusive processes" @default.
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• W2072686486 doi "https://doi.org/10.1103/physrevd.88.034010" @default.

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