arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1906.08930hep-exhep-ph
收藏

BESIII Exotics

BESIII Exotics

G. Mezzadri

摘要:

近几年来,在开重介子阈值之上出现了一类新的奇异态,即所谓的$XYZ$态。BEPCII $e^+e^-$对撞机上的BESIII在研究粲偶素部分的粒子方面发挥着独特的作用。通过改变束流能量,BESIII可以通过扫描共振区域收集大量数据样本,直接访问所有矢量状态。作为更大的升级计划的一部分,BESIII计划将质心能量提高到$4.7$ GeV:这将使BESIII能够研究$Y(4660)$的性质,这是Belle和BaBar在初始状态辐射后首次观察到的,仅在$ππψ(2s)$和$Λ_c$ $\barΛ_c$最终状态。相对分支比似乎指向重子共振的解释,正如罗西-维尼齐亚诺模型所预期的那样。BESIII可以直接测量预期峰位置周围的截面,并验证这一预测。在本报告中,将介绍在BESIII进行的$XYZ$检索的状态,重点还包括最新数据采集和$Y(4660)$研究的计划。

英文摘要:

Since few years, a new family of exotic states has been appearing above the open-heavy meson thresholds: the so-called $XYZ$ states. BESIII at the BEPCII $e^+e^-$ collider plays a unique role in the study of those particles in the charmonium sector. Changing the beam energy, BESIII can collect large data samples by means of scans of the resonant region, accessing directly to all vector states. As part of a larger upgrade program, BESIII has planned to increase the center of mass energy to reach $4.7$ GeV: this will allow BESIII to investigate the nature of the $Y(4660)$, that was at first observed by Belle and BaBar after Initial State Radiation only in $ππψ(2s)$ and $Λ_c$ $\barΛ_c$ final states. The relative branching ratio seems to point toward a baryonium interpretation of the resonance, as expected in Rossi-Veneziano model. BESIII can directly measure the cross sections around the expected peak position and verify this prediction. In this presentation, the status of the $XYZ$ searches at BESIII will be presented, with a focus also on the plans for the newest data taking and for the $Y(4660)$ studies.

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。

↑