Zobrazeno 1 - 10
of 37
pro vyhledávání: '"Grozin, Andrey G."'
Autor:
Grozin, Andrey G.
The perturbative contribution to the correlator of two HQET heavy-light currents expanded in light-quark masses up to quadratic terms is calculated up to 4 loops.
Comment: 4 pages, no figures
Comment: 4 pages, no figures
Externí odkaz:
http://arxiv.org/abs/2411.11080
We calculate the small angle expansion of the four-loop QCD cusp anomalous dimension. As a byproduct of our calculation, we also obtain the four-loop anomalous dimension of the heavy-quark field in HQET. The validity of the calculational setup is cro
Externí odkaz:
http://arxiv.org/abs/2208.09277
Autor:
Grozin, Andrey G., Marquard, Peter, Smirnov, Alexander V., Smirnov, Vladimir A., Steinhauser, Matthias
Publikováno v:
Phys. Rev. D 102, 054008 (2020)
The QCD/HQET matching coefficient for the heavy-quark field is calculated up to four loops. It must be finite; this requirement produces analytical results for some terms in the four-loop on-shell heavy-quark field renormalization constant which were
Externí odkaz:
http://arxiv.org/abs/2005.14047
Publikováno v:
Phys. Rev. D 98, 054020 (2018)
We compute perturbative matching coefficients to the Heavy Quark Effective Theory representation for the QCD effective local $\Delta B=2$ Hamiltonian that determines the mass difference in $B^0-\bar{B}^0$ system of states. We report on the results at
Externí odkaz:
http://arxiv.org/abs/1806.00253
Publikováno v:
Phys. Rev. D 96, 074032 (2017)
We compute perturbative corrections to matching coefficients of QCD to HQET for the matrix element of the $\Delta B=2$ operator that determines the mass difference in $B^0-\bar{B}^0$ system of states. This involves the technical point of choosing the
Externí odkaz:
http://arxiv.org/abs/1706.05910
Publikováno v:
Phys. Rev. D 94, 034024 (2016)
We compute the perturbative corrections to the HQET sum rules for the matrix element of the \Delta B=2 operator that determines the mass shift of $B^0$, $\bar{B}^0$ states. Technically, we obtain analytically the non-factorizable contributions at ord
Externí odkaz:
http://arxiv.org/abs/1606.06054
We compute the decoupling relations for the strong coupling, the light quark masses, the gauge-fixing parameter, and the light fields in QCD with heavy charm and bottom quarks to three-loop accuracy taking into account the exact dependence on $m_c/m_
Externí odkaz:
http://arxiv.org/abs/1107.5970
Autor:
Grozin, Andrey G., Lee, Roman N.
Publikováno v:
JHEP 0902:047,2009
Three-loop vertex diagrams in HQET needed for sum rules for B^0 - \bar{B}^0 mixing are considered. They depend on two residual energies. An algorithm of reduction of these diagrams to master integrals has been constructed. All master integrals are ca
Externí odkaz:
http://arxiv.org/abs/0812.4522
Autor:
Grozin, Andrey G., Neubert, Matthias
Publikováno v:
Nucl.Phys. B495 (1997) 81-98
We discuss the renormalization of local, scalar and pseudoscalar dimension-5 operators containing a heavy and a light quark field at scales below the heavy-quark mass, using the formalism of the heavy-quark effective theory (HQET). We calculate the a
Externí odkaz:
http://arxiv.org/abs/hep-ph/9701262
Autor:
Grozin, Andrey G., Neubert, Matthias
Publikováno v:
Phys.Rev. D55 (1997) 272-290
Using methods developed for hard exclusive QCD processes, we calculate the asymptotic behaviour of heavy-meson form factors at large recoil. It is determined by the leading- and subleading-twist meson wave functions. For $1\ll |v\cdot v'|\ll m_Q/\Lam
Externí odkaz:
http://arxiv.org/abs/hep-ph/9607366