Lattice QCD study of mixed systems of pions and kaons
The O(100) different ground state energies of N-pion and M-kaon systems for N+M <= 12 are studied in lattice QCD. These energies are then used to extract the various two- and three- body interactions that occur in these systems. These calculations are performed using one ensemble of 2+1 flavor anisotropic lattices with a spatial lattice spacing $$a_s$$ ~ 0.125 fm, an anisotropy factor $$\xi=a_s/a_t=3.5$$, and a spatial volume $$L^3\sim (2.5\ {\rm fm})^3$$. Particular attention is paid to additional thermal states present in the spectrum because of the finite temporal extent. The quark masses used correspond to pion and kaon masses of $$m_\pi$$ ~ 383 MeV and $$m_K$$ ~ 537 MeV, respectively. The isospin and strangeness chemical potentials of these systems are found to be in the region where chiral perturbation theory and hadronic models predict a phase transition between a pion condensed phase and a kaon condensed phase.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- AC05-06OR23177
- OSTI ID:
- 1022604
- Report Number(s):
- JLAB-THY-11-1332; DOE/OR/23177-1509; arXiv:1103.4362; PRVDAQ; TRN: US1104304
- Journal Information:
- Phys.Rev.D, Vol. 84, Issue 01; ISSN 1550-7998
- Country of Publication:
- United States
- Language:
- English
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