A measurement of semileptonic B decaysto narrow orbitally-excited charm mesons期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

按检索

A measurement of semileptonic B decaysto narrow orbitally-excited charm mesons

Authors:	The OPAL Collaboration

Abstract:	The decay chain $b \to \bar{\mathrm{B}} \rightarrow \mathrm{D}^{0} \ell^- \bar{\nu} X , \mathrm{D}^{0}\rightarrow \mathrm{D}^{+}\pi^-,\mathrm{D}^{+} \to \mathrm{D}^0\pi^+, D^0 \to (\mathrm{K}\pi \mathrm{or} \mathrm{K}3\pi)$ is identified in a sample of 3.9 million hadronic Z decays collected with the OPAL detector at LEP. The branching ratio BR $(b \to \bar{B}) \times \mathrm{BR}(\bar{B} \to \mathrm{D}^0_1 \ell^-\bar{\nu} X) \times \mathrm{BR}(\mathrm{D}^0_1 \to \mathrm{D}^{+}\pi^-)$ is measured to be $(2.64 \pm 0.79 (\mathrm{stat}) \pm 0.39 (\mathrm{syst})) \times 10^{-3}$ for the J ^P=1⁺ (D⁰ ₁) state. For decays into the J ^P=2⁺ (D₂ ^0) state, an upper limit of 1.4 x 10^-3 is placed on the branching ratio at the 95% confidence level.Received: 20 December 2002, Revised: 15 April 2003, Published online: 12 September 2003

Keywords:
本文献已被 SpringerLink 等数据库收录！