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Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands.
Physik-Institut, Universität Zürich, Zürich, Switzerland.
Phys Rev Lett. 2019 Jun 14;122(23):232001. doi: 10.1103/PhysRevLett.122.232001.
Using pp collision data corresponding to an integrated luminosity of 8.5 fb^{-1} recorded by the LHCb experiment at center-of-mass energies of sqrt[s]=7, 8, and 13 TeV, the observation of an excited B_{c}^{+} state in the B_{c}^{+}π^{+}π^{-} invariant-mass spectrum is reported. The observed peak has a mass of 6841.2±0.6(stat)±0.1(syst)±0.8(B_{c}^{+}) MeV/c^{2}, where the last uncertainty is due to the limited knowledge of the B_{c}^{+} mass. It is consistent with expectations of the B_{c}^{}(2^{3}S_{1})^{+} state reconstructed without the low-energy photon from the B_{c}^{}(1^{3}S_{1})^{+}→B_{c}^{+}γ decay following B_{c}^{}(2^{3}S_{1})^{+}→B_{c}^{}(1^{3}S_{1})^{+}π^{+}π^{-}. A second state is seen with a global (local) statistical significance of 2.2σ (3.2σ) and a mass of 6872.1±1.3(stat)±0.1(syst)±0.8(B_{c}^{+}) MeV/c^{2}, and is consistent with the B_{c}(2^{1}S_{0})^{+} state. These mass measurements are the most precise to date.
利用大型强子对撞机底夸克实验（LHCb）在质心能量(\sqrt{s}=7)、(8)和(13) TeV下记录的对应于(8.5,\text{fb}^{-1})积分亮度的质子-质子碰撞数据，报告了在(B_{c}^{+}\pi^{+}\pi^{-})不变质量谱中对激发态(B_{c}^{+})的观测。观测到的峰值质量为(6841.2\pm0.6)（统计）(\pm0.1)（系统）(\pm0.8)（(B_{c}^{+})）(\text{MeV}/c^{2})，其中最后一项不确定性是由于对(B_{c}^{+})质量的了解有限所致。它与在(B_{c}^{}(2^{3}S_{1})^{+}\to B_{c}^{}(1^{3}S_{1})^{+}\pi^{+}\pi^{-})之后，不包括来自(B_{c}^{}(1^{3}S_{1})^{+}\to B_{c}^{+}\gamma)衰变的低能光子而重建的(B_{c}^{}(2^{3}S_{1})^{+})态的预期相符。还观测到第二个态，其全局（局部）统计显著性为(2.2\sigma)（(3.2\sigma)），质量为(6872.1\pm1.3)（统计）(\pm0.1)（系统）(\pm0.8)（(B_{c}^{+})）(\text{MeV}/c^{2})，并且与(B_{c}(2^{1}S_{0})^{+})态相符。这些质量测量是迄今为止最精确的。
