Formation of a narrow baryon resonance with positive strangeness in K^+ collisions with Xe nuclei
V. V. Barmin, A. E. Asratyan, V. S. Borisov, C. Curceanu, G. V. Davidenko, A. G. Dolgolenko, C. Guaraldo, M. A. Kubantsev, I. F. Larin, V. A. Matveev, V. A. She… 展开作者
V. V. Barmin, A. E. Asratyan, V. S. Borisov, C. Curceanu, G. V. Davidenko, A. G. Dolgolenko, C. Guaraldo, M. A. Kubantsev, I. F. Larin, V. A. Matveev, V. A. Shebanov, N. N. Shishov, L. I. Sokolov, G. K. Tumanov, V. S. Verebryusov
The data on the charge-exchange reaction K^+Xe --> K^0 p Xe, obtained with the bubble chamber DIANA, are reanalyzed using increased statistics and updated selections. Our previous evidence for formation of a narrow pK^0 resonance with mass near 1538 MeV is confirmed and reinforced. The statistical significance of the signal reaches some 8σ(6σ) when estimated as S/\sqrt{B} (S/\sqrt{B+S}). The mass and intrinsic width of the Θ^+ baryon are measured as m = (1538+-2) MeV and Γ= (0.39+-0.10) MeV.
Observation of a baryon resonance with positive strangeness in K+ collisions with Xe nuclei
本文报道了我们在氙泡室DIANA中研究低能$K^+$碰撞的情况。在电荷交换反应$K^+Xe \to K^0 p Xe'$中，$K^0 p$有效质量的光谱显示出与$M = 1539 \pm 2$ MeV/$^2$和$Γ\le 9 MeV/c$ ^2 $. The statistical significance of the enhancement is near $ 4.4σ$的共振增强。观察到的共振的质量和宽度与手征孤立子模型框架中预测的奇异五夸克重子反十重态最轻成员的预期一致。
Studying strangeness and baryon production mechanisms through angular correlations between charged $Ξ$ baryons and identified hadrons in pp collisions at $\sqrt{s}$ = 13 TeV
本文利用 ALICE 探测器在 $\sqrt{s}=13$ TeV pp 碰撞中测量带电 $Ξ$ 重子与已鉴别强子的角关联，研究了奇异性与重子产生机制，发现现有 Monte Carlo 模型均无法完全描述数据，为产生机制提供了严格约束。
The Search and Study of the Baryonic Resonances with the Strangeness S = +1 in the System of nK+ from the Reaction np -> npK+K- at the Momentum of Incident Neutrons Pn = (5.20+/-0.12)GeV/c
Production of strange and charmed baryons in pion induced reactions
我们基于两种不同的理论框架：有效拉格朗日方法和Regge方法，研究了π介子束诱导的奇异和粲产生，即$π^-$ p $\rightarrow$ $K^{*0}Λ$和$π^-$ p $\rightarrow$ $D^{*-}Λ_c^+$反应.为了估计粲子产生相对于奇异度产生的大小，我们假设粲子和重子顶点的耦合常数与奇异度通道的耦合常数相同。我们发现，魅力生产的总截面约为$10^3 - 10^6$倍小于奇异生产，这取决于理论方法和运动学区域。我们还讨论了每一个贡献，这两个反应的观测。一般来说，Regge方法在整个能量区域内很好地解释了实验数据。
