講演題目：　Hadronic and Quark/Gluon Degrees of Freedom in Hadron Interactions

講　師　：　Prof. Earle L. Lomon 
　　　　　(Department of Physics, Massachusetts Institute of Technology, U.S.A.)

日　時　：　平成11年11月16日 (火) 16:00-17:00
場　所　：　北海道大学理学部２号館大学院講義室（2-2-11）

要　旨　：
The success of Quantum Chromodynamics (QCD) in its perturbative,high momentum transfer regime, leads to the expectation that it is thegeneral theory for the strong interaction of hadrons. But the direct, lattice QCD, calculations of non-perturbative multi-hadron reactions are not now feasible. I will describe a model for QCD which incorporates its critical features of asymptotic freedom with quark and gluon degrees of freedom at short range, and confinement to hadron degrees of freedom at long range. In this hybrid model the inner and outer regions are connected by a boundary condition determined by R-Matrix theory, enabling the description of the transition from confinement to asymptotic freedom. A consequence is the prediction of exotic multi-quark state resonances, whose position and width are mainly determined by perturbative QCD with gluon exchange, but are coupled to the continuum and molecular resonances by the long range hadron exchange forces. Observable consequences in the baryon-baryon (S=0,−1 and−2), and meson-baryon (S=1) sectors will be described and compared with available data. Ways to improve the accuracy and realism of the model will be described.

世話人　 原田稔
（0134-27-5411, （自宅）011-591-8913: mharada@res.otaru-uc.ac.jp）
小樽商科大学一般教育