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arXiv 0710.5763hep-ex
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激发态奇异粲重子的研究及新重子<$_c(3055)^+和<$_c(3123)^+的证据

A Study of Excited Charm-Strange Baryons with Evidence for new Baryons Ξ_c(3055)^+ and Ξ_c(3123)^+

The BABAR Collaboration, B. Aubert

摘要:

我们提出了一个在$e^+e^-$湮灭或附近的质量中心的能量为$10.58\mathrm{Ge\kern -0.1em V}$的激发的魅力奇怪重子态的研究,在一个数据样本的积分光度为$384 fb^{-1}$记录在斯坦福线性加速器中心的PEP-II $e^+e^-$存储环的BABAR探测器。我们研究了粲奇异重子到$Λ_c^+K^0_{\scriptscriptstyle S}$、$Λ_c^+K^-$、$Λ_c^+K^-π^+$、$Λ_c^+K^0_{\scriptscriptstyle S}π^-$、$Λ_c^+K^0_{\scriptscriptstyle S}π^-π^+$和$Λ_c^+K^-π^+π^-$的强衰变。该研究证实了状态$Ξ_c(2980)^+$、$Ξ_c(3077)^+$和$Ξ_c(3077)^0$的存在,并更准确地确定了$Ξ_c(2980)^+$的质量和宽度。我们还提出了两个新的状态,$Ξ_c(3055)^+$和$Ξ_c(3123)^+$,通过中间共振模式$Σ_c(2455)^{++}K^-$和$Σ_c(2520)^{++}K^-$,分别衰减的证据。对于这些重子中的每一个,我们测量每个最终状态的产额,确定统计显著性,并计算产生截面和分支分数的乘积。我们还测量了这些激发的奇异夸克重子的质量和宽度。

英文摘要:

We present a study of excited charm-strange baryon states produced in $e^+e^-$ annihilations at or near a center-of-mass energy of $10.58\mathrm{Ge\kern -0.1em V}$, in a data sample with an integrated luminosity of $384 fb^{-1}$ recorded with the BABAR detector at the PEP-II $e^+e^-$ storage rings at the Stanford Linear Accelerator Center. We study strong decays of charm-strange baryons to $Λ_c^+K^0_{\scriptscriptstyle S}$, $Λ_c^+K^-$, $Λ_c^+K^-π^+$, $Λ_c^+K^0_{\scriptscriptstyle S}π^-$, $Λ_c^+K^0_{\scriptscriptstyle S}π^-π^+$, and $Λ_c^+K^-π^+π^-$. This study confirms the existence of the states $Ξ_c(2980)^+$, $Ξ_c(3077)^+$, and $Ξ_c(3077)^0$, with a more accurate determination of the $Ξ_c(2980)^+$ mass and width. We also present evidence for two new states, $Ξ_c(3055)^+$ and $Ξ_c(3123)^+$, decaying through the intermediate resonant modes $Σ_c(2455)^{++}K^-$ and $Σ_c(2520)^{++}K^-$, respectively. For each of these baryons, we measure the yield in each final state, determine the statistical significance, and calculate the product of the production cross-section and branching fractions. We also measure the masses and widths of these excited charm-strange baryons.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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