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Title: Universal dimer–dimer scattering in lattice effective field theory

We consider two-component fermions with short-range interactions and large scattering length. This system has universal properties that are realized in several different fields of physics. In the limit of large fermion–fermion scattering length a ff and zero-range interaction, all properties of the system scale proportionally with a ff. For the case with shallow bound dimers, we calculate the dimer–dimer scattering phase shifts using lattice effective field theory. We extract the universal dimer–dimer scattering length a dd/a ff=0.618(30) and effective range r dd/a ff=-0.431(48). This result for the effective range is the first calculation with quantified and controlled systematic errors. We also benchmark our methods by computing the fermion–dimer scattering parameters and testing some predictions of conformal scaling of irrelevant operators near the unitarity limit.
Authors:
ORCiD logo [1] ;  [2] ;  [3] ;  [4] ;  [2]
  1. Univ. of Bonn (Germany). Helmholtz-Institut fur Strahlen-und Kernphysik (Theorie) and Bethe Center for Theoretical Physics; Karamanoglu Mehmetbey Univ., Karaman (Turkey). Dept. of Physics
  2. Mississippi State Univ., Mississippi State, MS (United States). HPC2Center for Computational Sciences, Dept. of Physics & Astronomy
  3. North Carolina State Univ., Raleigh, NC (United States). Dept. of Physics
  4. Univ. of Bonn (Germany). Helmholtz-Institut fur Strahlen-und Kernphysik (Theorie) and Bethe Center for Theoretical Physics; Forschungszentrum Julich (Germany). Julich Center for Hadron Physics and JARA - High Performance Computing, Inst. for Advanced Simulation, Inst. fur Kernphysik
Publication Date:
Grant/Contract Number:
FG02-03ER41260; PHY-1307453; 05P2015; 2017VMA0025
Type:
Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 768; Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Research Org:
North Carolina State Univ., Raleigh, NC (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
OSTI Identifier:
1350151
Alternate Identifier(s):
OSTI ID: 1368179