Since 2002, the treatment of the branching ratios of the ψ(2S) and χc0,1,2 has undergone an important restructuring. When measuring a branching ratio experimentally, it is not always possible to normalize the number of events observed in the corresponding decay mode to the total number of particles produced. Therefore, the experimenters sometimes report the number of observed decays with respec...

ble present the results of an experimental study of two properties of the tau lepton performed with the MARK II detector in the SPEAR e+estorage ring at SLAC. The tau production cross section in e+eannihilation between 3.85 and 6.85 Gev in the center of mass has been measured using e-u events, and is consistent with the spin l/2, point cross section. The branching ratio product for the electron...

The nonstatistical dissociation of acetone radical cation has been studied by ab initio direct classical trajectory calculations at the MP2/6-31G(d) level of theory. A bond additivity correction has been used to improve the MP2 potential energy surface (BAC-MP2). The energy dependence of the branching ratio, dissociation kinetics, and translational energy distribution for the two types of methy...

Knowledge of the γ-ray branching ratios of the 7.12-MeV state of 16 O is important for the extrapolation of the 12 C(α,γ) 16 O cross section to astrophysical energies. Ground state transitions provide most of the 12 C(α,γ) 16 O total cross section while cascade transitions have contributions of the order of 10-20%. Determining the 7.12 → 6.92-MeV branching ratio will also result in a better ext...

−∞ dqD(q). The scattering cross section σ thus approximately decouples into on-shell production (σp) and decay as shown in Eq. (1) for a scalar process [1]. The generalization to multiple resonances is straightforward. We use the notation of [2], Sec. 38. Based on the scales occurring in D(q), the conventional error estimate is O(Γ/M). The branching fraction for the considered decay mode is the...