Pole Analysis on Unitarized SU（3） × SU（3） One
Loop χPT Amplitudes
戴凌云;王轩弓;郑汉青
【期刊名称】《理论物理通讯（英文版）》 【年(卷),期】2012(057)005
【摘要】We analyze ππ-KK and πη-KK couple channel [1,1] matrix Padé amplitudes of SU（3） × SU（3） chiral perturbation theory.By fitting phase shift and inelasticity data,we determine pole positions in different channels （f 0 （980）,a 0 （980）,f 0 （600）,K＊0 （800）,K＊（892）,ρ（770）） and trace their N c trajectories.We stress that a couple channel Breit-Wigner resonance should exhibit two poles on different Riemann sheets and meet each other on the real axis when N c=∞.Poles are hence classified using this criteria and we conclude that K＊（892） and ρ（770） are unambiguous Breit-Wigner resonances.For scalars the situation is much less clear.We find that f 0 （980） is a molecular state rather than a Breit-Wigner resonance,while a 0 （980）,though behave oddly when varying N c,do maintain a twin pole structure.
【总页数】8页(841-848)
【关键词】SU（3）;振幅;太平洋;循环;手征微扰理论;株式会社;轨迹跟踪;分子状态
【作者】戴凌云;王轩弓;郑汉青
Pole Analysis on Unitarized SU(3) × SU(3) One Loop χPT Amplitudes
