Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-09-25
Phys.Rev. D55 (1997) 3016-3026
Physics
High Energy Physics
High Energy Physics - Phenomenology
18 pages, LaTeX, 3 figures are included in PostScript format
Scientific paper
10.1103/PhysRevD.55.3016
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 the Wilson coefficients of the leading term in the Operator Product Expansion (OPE). From the sum rules we obtain estimates for the masses and the residues of the heavy baryons $\Lambda_Q$ and $\Sigma_Q$. The perturbative $O(\alpha_s)$ corrections to the leading order spectral function amount to about $100%$, and they shift the calculated values for the baryon masses slightly upward. The residues are shifted upward by about $20-50%$. For the bound state energy $\bar\Lambda$ given by the difference of the heavy baryon mass and the pole mass of the heavy quark $m_Q$ we obtain $m_{\Lambda_Q}-m_Q=780 MeV$ and $m_{\Sigma_Q}-m_Q=950 MeV$. For the residues we find $|F_\Lambda|=0.028 GeV^3$ and $|F_\Sigma|=0.039 GeV^3$.
Groote Stefan
Körner Juergen G.
Yakovlev O. I.
No associations
LandOfFree
QCD Sum Rules for Heavy Baryons at Next-to-Leading Order in alpha_s does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with QCD Sum Rules for Heavy Baryons at Next-to-Leading Order in alpha_s, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and QCD Sum Rules for Heavy Baryons at Next-to-Leading Order in alpha_s will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-461245