Baryon masses at nonzero isospin/kaon density
We present a lattice QCD calculation of the ground-state energy shifts of various baryons in a medium of pions or kaons at a single value of the quark mass corresponding to a pion mass of m[subscript π] ~ 390 MeV and a kaon mass of m[subscript K] ~ 540 MeV, and in a spatial volume V ~ (4 fm)[supe...
| Main Authors: | , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
| Published: |
American Physical Society
2014
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| Online Access: | http://hdl.handle.net/1721.1/84707 https://orcid.org/0000-0002-0400-8363 |
| Summary: | We present a lattice QCD calculation of the ground-state energy shifts of various baryons in a medium of pions or kaons at a single value of the quark mass corresponding to a pion mass of m[subscript π] ~ 390 MeV and a kaon mass of m[subscript K] ~ 540 MeV, and in a spatial volume V ~ (4 fm)[superscript 3]. All systems are created using a canonical formalism in which quark propagators are contracted into correlation functions of fixed isospin/kaon density. We study four different systems, Σ[superscript +](π[superscript +])n, Ξ[superscript 0](π[superscript +])[superscript n], p(K[superscript +])[superscript n], and n(K[superscript +])[superscript n], for up to n = 11 mesons. From the ground-state energy shifts we extract two- and three-body scattering parameters, as well as linear combinations of low-energy constants appearing in tree-level chiral perturbation theory. |
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