Baryon Axial Currents in QCD
نویسندگان
چکیده
We prove that the 1/Nc corrections to the baryon axial current matrix elements are proportional to their lowest order values. This implies that the first correction to axial current coupling constant ratios vanishes, and that the SU(2Nf ) spin-flavor symmetry relations are only violated at second order in 1/Nc. UCSD/PTH 93-18 hep-ph/9307242 July 1993
منابع مشابه
Baryon-number-induced Chern-Simons couplings of vector and axial-vector mesons in holographic QCD.
We show that holographic models of QCD predict the presence of a Chern-Simons coupling between vector and axial-vector mesons at finite baryon density. In the Anti de Sitter/Conformal Field Theory dictionary, the coefficient of this coupling is proportional to the baryon number density and is fixed uniquely in the five-dimensional holographic dual by anomalies in the flavor currents. For the li...
متن کاملNucleon form factors induced by isovector and isoscalar axial–vector currents in QCD
Using the most general form of the baryon current, nucleon form factors, induced by isovector and isoscalar axial–vector currents, are studied in the framework of light cone QCD sum rule approach. Comparison of our results on form factors with the existing results and lattice calculations are presented. PACS number(s): 11.55.Hx, 13.40.Em, 14.20.Jn e-mail: [email protected] permanent address:In...
متن کاملRecoil order chiral corrections to baryon octet axial vector currents and large Nc QCD
We compute the chiral corrections to octet baryon axial vector currents through O(p3) in heavy baryon chiral perturbation theory, including both octet and decuplet baryon intermediate states. We include the latter in a consistent way by using the small scale expansion. We find that, in contrast to the situation at O(p2), there exist no cancellations between octet and decuplet contributions at O...
متن کاملTwo-loop anomalous dimensions of heavy baryon currents in heavy quark effective theory.
We present results on the two-loop anomalous dimensions of the heavy baryon HQET currents J = (qTCΓτq)Γ′Q with arbitrary Dirac matrices Γ and Γ. From our general result we obtain the two-loop anomalous dimensions for currents with quantum numbers of the ground state heavy baryons ΛQ, ΣQ and Σ∗Q. As a by-product of our calculation and as an additional check we rederive the known two-loop anomalo...
متن کاملBaryon axial currents
The baryon axial currents are calculated at one–loop order in heavy baryon chiral perturbation theory by employing both a cutoff and dimensional regularization. Data from the semileptonic baryon decays is used to perform a least–squares fit to the two axial couplings D and F of the effective Lagrangian. Predictions for the momentum dependent axial form factors are made and the two different reg...
متن کامل