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北美退伍军人节(Veterans Day),12 日无更新
arXiv 2001.06533hep-ex
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在$\sqrt{s} =$ ~(13)TeV质子-质子碰撞中$Λ_\mathrm{b}^0$激发态衰变到$Λ_\mathrm{b}^0π^+π^-$的研究

Study of excited $Λ_\mathrm{b}^0$ states decaying to $Λ_\mathrm{b}^0π^+π^-$ in proton-proton collisions at $\sqrt{s} =$ 13 TeV

CMS Collaboration

摘要:

基于2016-2018年在LHC上使用CMS探测器收集的数据样本,在13 TeV的质心能量下进行质子-质子碰撞,报告了激发$Λ_\mathrm{b}^0$重子的研究,对应于高达140 fb $^{-1}$的积分亮度。确认了在$Λ_\mathrm{b}^0$质谱中存在$Λ_\mathrm{b}$(5912)$^0$、$Λ_\mathrm{b}$(5920)$^0$、$Λ_\mathrm{b}$(6146)$^0$和$Λ_\mathrm{b}$(6152)$^0$四种激发态,并测量了它们的质量。$Λ_\mathrm{b}^0π^+π^-$质量分布在6040-6100 MeV区域内表现出广泛的过量事件,其起源无法用目前的数据辨别。

英文摘要:

A study of excited $Λ_\mathrm{b}^0$ baryons is reported, based on a data sample collected in 2016-2018 with the CMS detector at the LHC in proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of up to 140 fb$^{-1}$. The existence of four excited $Λ_\mathrm{b}^0$ states: $Λ_\mathrm{b}$(5912)$^0$, $Λ_\mathrm{b}$(5920)$^0$, $Λ_\mathrm{b}$(6146)$^0$, and $Λ_\mathrm{b}$(6152)$^0$ in the $Λ_\mathrm{b}^0π^+π^-$ mass spectrum is confirmed, and their masses are measured. The $Λ_\mathrm{b}^0π^+π^-$ mass distribution exhibits a broad excess of events in the region of 6040-6100 MeV, whose origin cannot be discerned with the present data.

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