ISSN:
1434-601X
Keywords:
12.40,−y
;
11.30.Rd
;
12.38.Gc
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract Approximating the long-distance gluon dynamics ofSU(3)colour by colour-dielectric block-spin variables, we obtain an effective QCD theory of a scalar colour-dielectric field and a massive colour-bleached gluon field coupled to light quarks. The massive vector field produces a strong attraction betweenq $$\bar q$$ pairs, which leads toq $$\bar q$$ condensation when the colour-dielectric field becomes small. We calculate $$\left\langle {\bar \psi \psi } \right\rangle$$ and the pion decay constantf n as a function of the dielectric field expectation value, by evaluating the fermion determinant in a derivative expansion, and integrating out the bosonic variables. We find that the effective quark-gluon coupling,α s eff , including quark effects, is large on the surface of bags, where $$\left\langle {\bar \psi \psi } \right\rangle$$ ±0, but decreases inside hadronic bags, where | $$\left\langle {\bar \psi \psi } \right\rangle$$ | is decreasing.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01288434
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