出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：Using a sample of 471 million BB events collected with the BaBar detector, we study the sum of seven exclusive final states B!Xs(d)g , where Xs(d) is a strange (non-strange) hadronic system with a mass of up to 2.0 Gev/c2. After correcting for unobserved decay modes, we obtain a branching fraction for b!dg of (9.2±2.0(stat.)±2.3(syst.))×10−6 in this mass range, and a branching fraction for b!sg of (23.0±0.8(stat.)±3.0(syst.))×10−5 in the same mass range. We find BF(b!dg ) BF(b!sg ) = 0.040±0.009(stat.)±0.010(syst.), from which we determine |Vtd/Vts| = 0.199±0.022(stat.)±0.024(syst.)±0.002(th.).
