Measurement of the properties of the ? b * 0 baryon
Measurement of the properties of the ? b * 0 baryon
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的特性的测量？
DOI：
10.1007/jhep05(2016)161
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发表时间：
2016
影响因子：
5.4
通讯作者：
Aaij R
中科院分区：
文献类型：
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作者：
Aaij R
我们在LHC B实验收集到的积分光度为3 fb − 1的质子-质子碰撞数据样本中，搜索衰减到B − π +的近阈值λ b 0共振。我们观察到一个共振态，具有以下性质：m（π-0 B）− m（π-B）− m（π +）= 15.727 ± 0.068（stat）± 0.023（syst）MeV/c2 Γ（π-0 B）= 0.90 ± 0.16（stat）± 0.08（syst）MeV。这证实了CMS协作组先前的观察结果。这种状态与夸克模型中所预期的JP = 3/2 + B 0共振相一致。 这是对质量的最精确的测定，也是对这种状态的自然宽度的第一次测量。我们还测量了σ（pp → π-0 bX）B（π-0 B → π-B π +）/σ（pp → π-bX）= 0.28 ± 0.03（stat.）± 0.01（系统）。
We perform a search for near-threshold Ξb0 resonances decaying to Ξb−π+ in a sample of proton-proton collision data corresponding to an integrated luminosity of 3 fb−1 collected by the LHCb experiment. We observe one resonant state, with the following properties: m(Ξ∗0b) − m(Ξ−b) − m(π+) = 15.727 ± 0.068(stat) ± 0.023(syst) MeV/c2 Γ(Ξ∗0b) = 0.90 ± 0.16(stat) ± 0.08(syst) MeV. This confirms the previous observation by the CMS collaboration. The state is consistent with the JP = 3/2+ Ξb∗ 0 resonance expected in the quark model. This is the most precise determination of the mass and the first measurement of the natural width of this state. We have also measured the ratio σ(pp→Ξ∗0bX)B(Ξ∗0b→Ξ−bπ+)/σ(pp → Ξ−bX) =0.28 ± 0.03(stat.) ± 0.01(syst.).