


(Seminar) Universal Physics of two Neutrons with one Flavored Meson in Effective Field Theory 
CAS Key Laboratory of Theoretical Physics  Institute of Theoretical Physics  Chinese Academy of Sciences  Seminar  Title 题目  Universal Physics of two Neutrons with one Flavored Meson in Effective Field Theory  Speaker 报告人  Dr. Udit Raha  Affiliation 所在单位  Indian Institute of Technology Guwahati  Date 日期  2018年5月15日（周二）上午10:00  Venue 地点  Conference Room 322, ITP main building  Abstract 摘要  We investigate the two and threebody universal physics associated with the swave threebody system consisting of a cluster of two neutrons and one flavored meson, i.e., either an antikaon K or a D0 meson, with total spinisospin J=0,I=3/2. The technique of extrapolation to unphysical quark masses between the strange and the charm flavors, provides a natural mechanism to tune the mesonneutron interaction close to resonant conditions. In the twobody sector, we show that the mesonneutron scattering length becomes infinitely large in an unphysical region of the quark mass in the socalled the Zero Coupling Limit of the WeinbergTomozawa contact interactions in the coupled channel system. Likewise in the threebody sector, using a pionless cluster effective field theory, we confirm an approximate limit cycle renormalization group behavior (with quasilogperiodicity) of the threebody coupling as a function of a sharp momentum cutoff introduced in the system of integral equations. This indicates that Efimov effect can be manifest in the threebody system when the mesonneutron scattering length is extrapolated to the unitary limit. Consequently, by varying the sharp cutoff we explore the possibilities of existence of threebody Efimovlike bound state formation. In particular, our analysis indicates that a plausible D0nn ground state trimer can be realized within the EFT framework with a cutoff lying much below the pion threshold. While for the Knn system, no physically realizable mechanism in the context of a lowenergy EFT can generate sufficient interaction strength to form bound states.  Contact person 所内联系人  郭奉坤  


