Observation of an Excited B_{c}^{+} State.
Observation of an Excited B_{c}^{+} State.
复制标题
观察激发的 B_{c}^{ } 状态。
DOI：
10.1103/physrevlett.122.232001
复制
发表时间：
2019
影响因子：
8.6
通讯作者：
Aaij R
中科院分区：
文献类型：
--
作者：
Aaij R
Usingcollision data corresponding to an integrated luminosity ofrecorded by the LHCb experiment at center-of-mass energies of, 8, and 13 TeV, the observation of an excitedstate in theinvariant-mass spectrum is reported. The observed peak has a mass of 6841.2±0.6(stat)±0.1(syst)±0.8(Bc+) MeV/c2, where the last uncertainty is due to the limited knowledge of themass. It is consistent with expectations of thestate reconstructed without the low-energy photon from thedecay following. A second state is seen with a global (local) statistical significance of() and a mass of 6872.1±1.3(stat)±0.1(syst)±0.8(Bc+) MeV/c2, and is consistent with thestate. These mass measurements are the most precise to date.
