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| (Seminar) Universal Physics of two Neutrons with one Flavored Meson in Effective Field Theory |
| 2018-05-15
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CAS Key Laboratory of Theoretical Physics |
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Institute of Theoretical Physics |
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Chinese Academy of Sciences |
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Seminar |
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Title
题目 |
Universal Physics of two Neutrons with one Flavored Meson in Effective Field Theory |
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Speaker
报告人 |
Dr. Udit Raha |
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Affiliation
所在单位 |
Indian Institute of Technology Guwahati |
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Date
日期 |
2018年5月15日（周二）上午10:00 |
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Venue
地点 |
Conference Room 322, ITP main building |
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Abstract
摘要 |
We investigate the two- and three-body universal physics associated with the s-wave three-body system consisting of a cluster of two neutrons and one flavored meson, i.e., either an antikaon K- or a D0 meson, with total spin-isospin 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 meson-neutron interaction close to resonant conditions. In the two-body sector, we show that the meson-neutron scattering length becomes infinitely large in an unphysical region of the quark mass in the so-called the Zero Coupling Limit of the Weinberg-Tomozawa contact interactions in the coupled channel system. Likewise in the three-body sector, using a pionless cluster effective field theory, we confirm an approximate limit cycle renormalization group behavior (with quasi-log-periodicity) of the three-body coupling as a function of a sharp momentum cut-off introduced in the system of integral equations. This indicates that Efimov effect can be manifest in the three-body system when the meson-neutron scattering length is extrapolated to the unitary limit. Consequently, by varying the sharp cut-off we explore the possibilities of existence of three-body Efimov-like bound state formation. In particular, our analysis indicates that a plausible D0nn ground state trimer can be realized within the EFT framework with a cut-off lying much below the pion threshold. While for the K-nn system, no physically realizable mechanism in the context of a low-energy EFT can generate sufficient interaction strength to form bound states. |
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Contact person
所内联系人 |
郭奉坤 |
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