Two-loop QCD corrections to $b\to c$ transitions at zero recoil

Details Two-loop QCD corrections to $b\to c$ transitions at zero recoil Two-loop QCD corrections to $b\to c$ transitions at zero recoil

1996-03-10

arxiv.org/abs/hep-ph/9603261v1

Phys.Rev.Lett. 76 (1996) 4124-4127

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, Revtex, one figure included

Scientific paper

10.1103/PhysRevLett.76.4124

Complete two-loop QCD corrections to $b\to c$ transitions are presented in the limit of zero recoil. Vector and axial-vector coefficients $\eta_{A,V}$ are calculated analytically in the limit of equal beauty and charm masses, and a series appoximation is obtained for the general mass case. $\eta_A$ is crucial for the determination of the absolute value of the Cabibbo-Kobayashi-Maskawa matrix element $V_{cb}$. The two-loop effects enhance the one-loop corrections by 21\%, removing a major theoretical uncertainty in the value of $|V_{cb}|$. Including two-loop QCD effects and previously neglected electroweak and Coulomb corrections we find $|V_{cb}| = 0.0379 \pm 0.0020({\rm stat}) \pm 0.0025({\rm syst}) \pm 0.0011({\rm theory})$.

Affiliated with

Also associated with

No associations

Rating

Two-loop QCD corrections to $b\to c$ transitions at zero recoil 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 Two-loop QCD corrections to $b\to c$ transitions at zero recoil, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Two-loop QCD corrections to $b\to c$ transitions at zero recoil will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1629