Mainz 2012 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 55: Hadronenstruktur und -spektroskopie
HK 55.5: Talk
Friday, March 23, 2012, 12:15–12:30, RW 2
Efimov Effect for P-wave Interactions — Eric Braaten1, •Philipp Hagen2, Hans-Werner Hammer2, and Lucas Platter3 — 1Department of Physics, The Ohio State University, Columbus, OH 43210, USA — 2Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics, Universität Bonn, 53115 Bonn, Germany — 3Chalmers University of Technology, Department of Fundamental Physics, SE-412 96 Gothenburg, Sweden
Nonrelativistic particles with short-range interactions that produce a P-wave threshold resonance can exhibit the Efimov effect: if the inverse scattering volume 1/a and the P-wave effective range r are simultaneously tuned to zero, there is an infinite sequence of three-body bound states called Efimov states that have an accumulation point at the threshold. The discrete scaling factor that characterizes the Efimov effect depends on the mass ratios and the symmetries of the three particles. There is no Efimov effect if all three particles are identical, but it can occur if two identical particles have a resonant P-wave interaction with a third particle. The spectrum of Efimov trimers is compatible with discrete scale invariance. The Efimov trimers disappear through the three-particle threshold at values of a and r that differ by appropriate powers of the discrete scaling factor.