| 词条 | Zc(3900) |
| 释义 |
The Zc(3900) is a hadron, a type of subatomic particle made of quarks, believed to be the first tetraquark that has been observed experimentally. The discovery was made in 2013 by two independent research groups: one using the BES III detector at the Chinese Beijing Electron Positron Collider, the other being part of the Belle experiment group at the Japanese KEK particle physics laboratory.[1][2][3][4][5] The Zc(3900) is a decay product of the previously observed anomalous Y(4260) particle.[6] The Zc(3900) in turn decays into a charged pion (π±) and a J/ψ meson. This is consistent with the Zc(3900) containing four or more quarks.[5] The first evidence of the neutral Zc(3900) was provided by CLEO-c in 2013[5]. It was later observed by BESIII in 2015. It decays into a neutral pion (π0) and a J/ψ meson.[7] Researchers were expected to run decay experiments in 2013 to determine the particle's nature with more precision.{{citation needed|date=June 2015}} See also
References1. ^.{{cite journal |last=Powel |first=D. |date=2013 |url=http://www.nature.com/news/quark-quartet-opens-fresh-vista-on-matter-1.13225 |title=Quark quartet opens fresh vista on matter |journal=Nature |volume=498 |issue=7454 |pages=280–281 |doi=10.1038/498280a|bibcode = 2013Natur.498..280P |pmid=23783605}} 2. ^{{cite journal |last=Ablikim |first=M. |author2=BESIII Collaboration |year=2013 |title=Observation of a Charged Charmoniumlike Structure in e+e−→π+π−J/ψ at √s = 4.26 GeV |journal=Physical Review Letters |volume=110 |issue=25 |pages=252001 |arxiv=1303.5949 |bibcode=2013PhRvL.110y2001A |doi=10.1103/PhysRevLett.110.252001|display-authors=etal}} 3. ^{{cite journal |last=Liu |first=Z. Q. |author2=Belle Collaboration |year=2013 |title=Study of e+e−→π+π−J/ψ and Observation of a Charged Charmoniumlike State at Belle |journal=Physical Review Letters |volume=110 |issue=25 |pages=252002 |bibcode=2013PhRvL.110y2002L |doi=10.1103/PhysRevLett.110.252002|display-authors=etal|url=http://bib-pubdb1.desy.de/record/152255}} 4. ^{{cite journal |last=Swanson |first=E. |year=2013 |title=Viewpoint: New Particle Hints at Four-Quark Matter |url=http://physics.aps.org/articles/v6/69 |journal=Physics |volume=6 |page=69 |doi=10.1103/Physics.6.69|bibcode = 2013PhyOJ...6...69S }} 5. ^1 2 {{cite journal |last1=Xiao |first1=T. |last2=Dobbs |first2=S. |last3=Tomaradze |first3=A. |last4=Seth |first4=K. K. |year=2013 |title=Observation of the Charged Hadron Z{{su|p=±|b=c}}(3900) and Evidence of the Neutral Z{{su|p=0|b=c}}(3900) at √s = 4170 MeV |arxiv=1304.3036 |doi=10.1016/j.physletb.2013.10.041 |volume=727 |journal=Physics Letters B |pages=366–370|bibcode=2013PhLB..727..366X}} 6. ^{{cite web |date=6 April 2013 |title=USTC Play a Role in Discovering New Subatomic Particle |url=http://en.ustc.edu.cn/news/201304/t20130403_149383.html |publisher=University of Science and Technology of China |accessdate=}} 7. ^{{cite journal |last=Ablikim |first=M. |author2=BESIII Collaboration |year=2015 |title=Observation of Zc(3900)0 in e+ e− to pi0 pi0 J/psi |journal=Physical Review Letters |volume=115 |issue= 11 | pages= 112003 |arxiv=1506.06018 |bibcode=2015PhRvL.115y2003A |doi=10.1103/PhysRevLett.115.112003|display-authors=etal}} External links
1 : Mesons |
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