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Volume 281 - The 26th International Nuclear Physics Conference (INPC2016) - QCD: Hadron Structure and Spectroscopy – Thursday 15
Hyperon Single-particle Potentials from QCD On Lattice
T. Inoue* On behalf of the HAL QCD Collaboration
*corresponding author
Full text: pdf
Pre-published on: 2017 May 04
Published on: 2017 May 09
We study single-particle potential of hyperons in nuclear medium starting from QCD.
First we carry out lattice QCD numerical simulation to extract baryon-baryon interactions from QCD by means of the HAL QCD method.
We employ a full QCD gauge configuration ensemble at almost physical point so that hadron masses are nearly physical,
e.g. pion mass is 146 MeV, kaon mass is 525 MeV, and nucleon mass is 956 MeV.
Then, with some simplifications, we apply the obtained hyperon interactions to the Brueckner-Hartree-Fock theory
and calculate single-particle potential of hyperons in nuclear medium $U_{Y}(\rho,k)$.
For the symmetric nuclear matter at the normal nuclear matter density,
we obtain $U_{\Lambda}(\rho_0,0)=-33$ MeV, $U_{\Sigma}(\rho_0,0)=+11$ MeV, and $U_{\Xi}(\rho_0,0)=-6$ MeV.
These results are qualitatively compatible with values suggested from experiments.
This success is remarkable and encouraging because we are trying to reveal nature of baryon-baryon interactions starting from QCD,
and this agreement proves that our approach is essentially correct.
Open Access
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