Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-06-19
Eur.Phys.J.C2:721-727,1998
Physics
High Energy Physics
High Energy Physics - Phenomenology
15 pages, LaTeX2e, 6 ps figures included
Scientific paper
10.1007/s100520050175
We estimate the couplings in the Heavy Hadron Chiral Theory (HHCT) lagrangian from the QCD sum rules in an external axial field. We take into account the perturbative correction to the meson correlator in the infinite mass limit. With the perturbative correction and three successive power corrections, the meson correlator in an axial field becomes one of the best known correlators. In spite of this, the corresponding sum rule is not very stable. It yields the result g_1 F^2/(380MeV)^3 = 0.1 - 0.2, where F^2 = f_M^2 m/4 = (380MeV)^3 is the central value of the heavy meson decay constant with the perturbative correction. This result is surprisingly low as compared with the constituent quark model estimate g_1 = 0.75. The sum rules for g_{2,3} following from nondiagonal Sigma-Sigma and diagonal Lambda-Sigma baryon correlators in an external axial field suggest g_{2,3} = 0.4 - 0.7, while diagonal Sigma-Sigma and nondiagonal Lambda-Sigma baryon sum rules have too large uncertainties.
Grozin Andrey G.
Yakovlev O. I.
No associations
LandOfFree
Couplings of heavy hadrons with soft pions from QCD sum rules does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Couplings of heavy hadrons with soft pions from QCD sum rules, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Couplings of heavy hadrons with soft pions from QCD sum rules will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-119223