Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-05-05
Phys.Rev. D59 (1999) 014011
Physics
High Energy Physics
High Energy Physics - Phenomenology
22 pages, 2 figures. (i) Sec.II is shortened, (ii) numerical results for epslion_i are revised, and (iii) Fig.2 is revised
Scientific paper
10.1103/PhysRevD.59.014011
The B meson lifetime ratios are calculated to the order of $1/m_b^3$ in the heavy quark expansion. The predictions of those ratios are dependent on four unknown hadronic parameters $B_1$, $B_2$, $\epsilon_1$ and $\epsilon_2$, where $B_1$ and $B_2$ parametrize the matrix elements of color singlet-singlet four-quark operators and $\epsilon_1$ and $\epsilon_2$ the matrix elements of color octet-octet operators. We derive the renormalization-group improved QCD sum rules for these parameters within the framework of heavy quark effective theory. The results are $B_1(m_b)=0.96\pm 0.04$, $B_2(m_b)=0.95\pm 0.02$, $\epsilon_1(m_b)=-0.14\pm 0.01$, and $\epsilon_2(m_b)=-0.08\pm 0.01$ to zeroth order in $1/m_b$. The resultant $B$ meson lifetime ratios are $\tau(B^-)/\tau(B_d)=1.11\pm 0.02$ and $\tau(B_s)/\tau(B_d)\approx 1$ in SU(3) symmetry limit.
Cheng Hai-Yang
Yang Kwei-Chou
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