收藏本站  |  联系我们  |  高能所主站  |  中国科学院  |  English
 
 首 页  理论室概况 科研队伍 学术活动 人才培养 科研成果 访问须知 人才需求 下载专区 TPCSF CFHEP
 
  当前位置:首页>学术活动>学术报告  
学术活动  
学术报告
学术会议
理论室青年论坛
学术报告
[10.13]Coupled-channel interpretation of the LHCb double-J/ψ spectrum
文章来源:  |  发布时间:2020-09-23  |  浏览:

Seminar

Title: Coupled-channel interpretation of the LHCb double-J/ψ spectrum 

Speaker: Prof. Feng-Kun Guo  郭奉坤 (ITP, CAS)

Time: 10:00  (Beijing Time), Tuesday, 2020-10-13

Place: R319, TPD, IHEP, CAS

Abstract: Recently, the LHCb Collaboration reported pronounced structures in the invariant mass spectrum of J/ψ-pairs produced in proton-proton collisions at the Large Hadron Collider. In this Letter, we argue that the data can be very well described within two variants of a unitary coupled-channel approach: (i) with just two channels, J/ψJ/ψ and ψ(2S)J/ψ, as long as energy-dependent interactions in these channels are allowed, or (ii) with three channels J/ψJ/ψ, ψ(2S)J/ψ and ψ(3770)J/ψ with just constant contact interactions. Both formulations hint at the existence of a near-threshold state in the J/ψJ/ψ system with the quantum numbers JPC=0++ or 2++, which we refer to as X(6200). We suggest experimental tests to check the existence of this state and discuss what additional channels need to be studied experimentally to allow for distinctive tests between the two mechanisms proposed.

I will also show how to use the programming language julia and the package IMinuit.jl to make a fit.

附件
版权所有 © 中国科学院高能物理研究所理论物理研究室 京ICP备05002790号
地址:北京市石景山区玉泉路19号乙院918-4 邮编:100049