Decoupling of heavy quarks in HQET | Zendy

Andrey Grozin | Zendy; Alexander V. Smirnov | Zendy; Vladimir A. Smirnov | Zendy

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Decoupling of heavy quarks in HQET

Author(s) -

Andrey Grozin,

Alexander V. Smirnov,

Vladimir A. Smirnov

Publication year - 2006

Publication title -

journal of high energy physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.998

H-Index - 261

eISSN - 1126-6708

pISSN - 1029-8479

DOI - 10.1088/1126-6708/2006/11/022

Subject(s) - decoupling (probability) , quark , physics , heavy quark effective theory , particle physics , lattice qcd , lattice (music) , engineering , control engineering , acoustics

Decoupling of c-quark loops in b-quark HQET is considered. The decouplingcoefficients for the HQET heavy-quark field and the heavy-light quark currentare calculated with the three-loop accuracy. The last result can be used toimprove the accuracy of extracting f_B from HQET lattice simulations (withoutc-quark loops). The decoupling coefficient for the flavour-nonsinglet QCDcurrent with n antisymmetrized gamma-matrices is also obtained at three loops;the result for the tensor current (n=2) is new.

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