Chiral Structure of Hadronic Currents. 陈华星 北京航空航天大学. April 21, 2014 武汉. Contents. Motivations Flavor structure of tetraquark Chiral structure of baryon Chiral structure of tetraquark Summary. 1. Motivation. Conventional mesons and baryons
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April 21, 2014 武汉
mesons : JPC=0--,0+-,1-+,2+-, etc.
baryons : S=+1 & B=1, I=5/2, etc.
Candidates: π1(1400), π1(1600) and π1(2000)with IGJPC =1-1-+
Zc(3900), Zc(4020)charged charmonium
A, B are the flavor indices; a is the color index. By adding δABand λAB, we can obtain singlet and octet, respectively.
1. bare mass term
2. electromagnetic terms
3. spontaneous chiral symmetry breaking terms