Zobrazeno 1 - 10
of 130
pro vyhledávání: '"YAkovlev, O. I."'
Autor:
Grozin, A. G., Yakovlev, O. I.
Publikováno v:
Phys.Lett.B285:254-262,1992
HQET currents with the quantum numbers of the ground-state baryons are discussed. One-loop anomalous dimensions are calculated, and exact one-loop matching to QCD currents is found. Two-point correlators of these currents are calculated taking into a
Externí odkaz:
http://arxiv.org/abs/hep-ph/9908364
Autor:
Kotsky, M. I., Yakovlev, O. I.
Publikováno v:
Phys.Lett. B418 (1998) 335-344
The decay of the Higgs boson into two photons is discussed. Using Sudakov technicue, we study a new type of double logarithms in the case of the light quark loop. First, we examine the origin of such logarithms at the one loop level. Then we perform
Externí odkaz:
http://arxiv.org/abs/hep-ph/9708485
Autor:
Grozin, A. G., Yakovlev, O. I.
Publikováno v:
Eur.Phys.J.C2:721-727,1998
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 perturbativ
Externí odkaz:
http://arxiv.org/abs/hep-ph/9706421
Publikováno v:
Phys. Rev. D 56, 3943 (1997)
We consider diagonal and non-diagonal QCD sum rules for the ground state heavy baryons to leading order in $1/m_Q$ and at next-to-leading order in $\alpha_S$. In the non-diagonal case we evaluate the eight different two-loop diagrams which determine
Externí odkaz:
http://arxiv.org/abs/hep-ph/9705447
Publikováno v:
Phys. Rev. D 55, 3016 (1997)
We derive QCD sum rules for heavy baryons at leading order in $1/m_Q$ and at next-to-leading order in $\alpha_s$. The calculation involves the evaluation of four different perturbative three-loop diagrams which determine the $\alpha_s$-corrections to
Externí odkaz:
http://arxiv.org/abs/hep-ph/9609469
Autor:
Yakovlev, O. I.
We discuss an application of QCD sum rules to the heavy baryons $\Lambda_Q$ and $\Sigma_Q$. The predictions for the masses of heavy baryons, residues and Isgur-Wise function are presented. The new results on two loop anomalous dimensions of baryonic
Externí odkaz:
http://arxiv.org/abs/hep-ph/9608348
Publikováno v:
Phys.Rev. D54 (1996) 3447-3456
We present results on the two-loop anomalous dimensions of the heavy baryon HQET currents $J=(q^TC\Gamma\tau q)\Gamma'Q$ with arbitrary Dirac matrices $\Gamma$ and $\Gamma'$. From our general result we obtain the two-loop anomalous dimensions for cur
Externí odkaz:
http://arxiv.org/abs/hep-ph/9604349
Publikováno v:
Phys.Rev. D53 (1996) 3737-3745
This note is devoted to the calculation of the two-loop $O(G_F {M_H}^2)$ radiative corrections to the Higgs decay width $H \to \gamma \gamma $ for large values of the Higgs boson mass $M_H$ within the Minimal Standard Model. The use of the Equivalenc
Externí odkaz:
http://arxiv.org/abs/hep-ph/9508334
Autor:
Grozin, A. G., Yakovlev, O. I.
We estimate the couplings in the Heavy Hadron Chiral Theory (HHCT) lagrangian from the QCD sum rules in an external axial field. Stability of the sum rules at moderate values of the Borel parameter is poor that probably signals a slow convergence of
Externí odkaz:
http://arxiv.org/abs/hep-ph/9401267