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(Seminar) Universal Physics of two Neutrons with one Flavored Meson in Effective Field Theory
2018-05-15  【 】【打印】【关闭

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 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.

Contact person

所内联系人

郭奉坤

 

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