Towards a Next-to-Next-to-Leading Order analysis of matching in $B^0$-$\bar{B}^0$ mixing

We compute perturbative corrections to matching coefficients of QCD to heavy quark effective theory (HQET) for the matrix element of the ΔB=2 operator that determines the mass difference in B0-B¯0 system of states. This involves the technical point of choosing the operator basis in HQET, separating physical operators from evanescent ones. We obtain an analytical result for some of the two-loop corrections at order αs2.

Note:

17 pages, 4 figures; v2: 3 refs added, corresponds to the published version

quantum chromodynamics: perturbation theory: higher-order
quantum chromodynamics: correction
correction: higher-order
higher-order: 2
Heavy Quark Effective Theory
flavor: violation
neutral current: flavor changing
B0 anti-B0: mixing
B0 anti-B0: mass difference
B/s0 anti-B/s0: mixing

References(59)

Figures(0)

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