Effects of Instantons on the YN Interaction
نویسندگان
چکیده
We investigate the symmetric and anti-symmetric spin-orbit forces (SLS and ALS) of the effective ΛN interaction derived from a quark cluster model with the instantoninduced interaction (I I I), which can reproduce the observed YN cross sections as well as the observed NN scattering data. It is found that coupling to the ΣN channel enhances ΛN ALS, and therefore that the cancellation between SLS and ALS in the ΛN channel becomes more complete. This may be one of the major reasons why the single-particle spin-orbit force of Λ in nuclei is weak.
منابع مشابه
Scale anomaly induced instanton interaction
The binary interaction of large size instantons in a SU(2) Yang-Mills theory is obtained from the one-loop effective action for the field strength. The instanton interaction is calculated as a function of the instanton separation and in dependence on radius and relative orientation of the instantons. Two equally oriented instantons with radii large compared with the scale defined by the gluon c...
متن کاملFermion Exchange between D - instantons
We define fermionic collective coordinates for type-IIB Dirichlet instantons and discuss some effects of the associated fermionic zero modes within the dilute gas framework. We show that the standard rules for clustering of zero modes in the dilute limit, and the fermion-exchange interactions follow from world-sheet Ward identities. Fermion exchange is strongly attractive at string-scale distan...
متن کاملA Note on Interactions of (Non-Commutative) Instantons Via AdS/CFT
We consider the interaction between instantons and anti-instantons in four-dimensional N = 4 super-Yang–Mills theory at large N and large ’t Hooft coupling as described by D-instantons via AdS/CFT duality. We give an estimate of the strength of the interaction in various regimes. We discuss also the case of Non-Commutative super-Yang–Mills theory where the interaction between instantons and ant...
متن کاملASPECTS OF D-INSTANTONS Talk at Nato ASI, Cargèse 1997, PUPT-1752, hep-th/9712156
An overview over effects of D-instantons in ten dimensional IIB superstring theory is given, including the supergravity instanton solution, instanton induced effective interaction vertices, the conjectured SL(2, Z) invariant completion of such terms and the connection of such terms to a one loop calculation in eleven dimensional supergravity.
متن کاملar X iv : h ep - p h / 06 11 19 8 v 2 2 0 N ov 2 00 6 Topological charge screening and the infrared behavior of the instanton density
A new mechanism for suppression of the instanton density in the infrared is considered. This mechanism is based on the phenomenon of topological charge screening, which leads to an effective cutoff in the contribution of large instantons. [email protected] Instantons, strong topological fluctuations of gluon fields in QCD, are widely believed to play an important role in the physics of the...
متن کامل