Abstract
Using the latest experimental results on semi-leptonic B-decays, we extract | V cb| by means of both QCD sum rules and sum rules in the infinite quark mass limit. It is shown that corrections from finite quark mass and the analytical structure of the Isgur-Wise function near the normalization point play a crucial part and question the reliability of the limit of infinitely heavy quarks for b → c decays. From QCD sum rules we obtain |V cb|( τ B 1.32 ps ) 1 2 = 0.037±0.002±0.003 , where the first error is experimental, and the second comes from uncertainties in the sum rule parameters.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
