Download or read book Measurement of Absolute Hadronic Branching Fractions of D Mesons written by Xin Shi and published by . This book was released on 2011 with total page 103 pages. Available in PDF, EPUB and Kindle. Book excerpt: Using 818 pb[-]1 of e+ e[-] collisions recorded at the [psi](3770) resonance with the CLEO-c detector at CESR, we determine absolute hadronic branching fractions of charged and neutral D mesons using a double tag technique. Among measurements for three D0 and six D+ modes, we obtain reference branching fractions B(D0 [RIGHTWARDS ARROW] K [-] [pi]+) = (3.906 ± 0.021 ± 0.062)% and B(D+ [RIGHTWARDS ARROW] K [-] [pi]+ [pi]+) = (9.157 ± 0.059 ± 0.125)%, where the first uncertainty is statistical, the second is systematic errors. Using an independent determination of the integrated luminosity, we also extract the cross sections [sigma](e+ e[-] [RIGHTWARDS ARROW] D0 D0) = (3.650 ± 0.017 ± 0.083) nb and [sigma](e+ e[-] [RIGHTWARDS ARROW] D+ D[-]) = (2.920 ± 0.018 ± 0.062) nb at a center of mass energy, Ecm = 3774 ± 1 MeV.