1202.3490 (Shijun Mao et al.)

Meson Scattering Identifying the BCS-BEC Crossover at Quark Level    [PDF]

Shijun Mao, Pengfei Zhuang

Instead of the fermion-fermion scattering which identifies the BCS-BEC
crossover in cold atom systems, boson-boson scattering is measurable and
characterizes the BCS-BEC crossover in QCD superfluid. We study $\pi$-$\pi$
scattering in a pion superfluid described by the Nambu--Jona-Lasinio model. We
found that the amplitude of the scattering length drops down monotonously with
decreasing isospin density and finally vanishes at the boundary of the phase
transition. This indicates clearly a BCS-BEC crossover in the pion superfluid.

View original: http://arxiv.org/abs/1202.3490