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タイトル: | Measurement of hadron masses in 2-color finite density QCD |
著者: | Murakami, Kotaro Suenaga, Daiki Iida, Kei Itou, Etsuko |
著者名の別形: | 村上, 耕太郎 伊藤, 悦子 |
発行日: | 23-Dec-2022 |
出版者: | Sissa Medialab |
誌名: | Proceedings of The 39th International Symposium on Lattice Field Theory — PoS(LATTICE2022) |
抄録: | We investigate hadron spectra in 2-color QCD using lattice simulation with $N_{f}=2$ at low temperature and finite density in which there appears not only the hadronic phase but also the superfluid phase. We first calculate the pion and rho meson spectrum, which is well-known from previous works. The spectral ordering of these mesons flips around the quark chemical potential $mu=m^{0}_{pi}/2$ ($m^{0}_{pi}$: the pion mass at $mu=0$), where the phase transition between the hadronic and superfluid phases occurs. For $mu gtrsim m^{0}_{pi}/2$, the effective mass for the pion linearly increases while the one for the rho meson monotonically decreases. Furthermore, we measure hadron spectra with the isospin $I=0$ and the angular momentum $J^{P}=0^{pm}$. The effective masses for the meson, diquark, and antidiquark with the same quantum number become degenerate just below $mu = m^{0}_{pi}/2$, and the three hadrons have the same mass in the superfluid phase. It suggests that mixing occurs between spectra associating with mesons and baryons due to the $U(1)_{B}$ symmetry breaking. This phenomenon can be explained in the linear sigma model with the approximate $SU(4)$ Pauli-Gursey symmetry. |
記述: | The 39th International Symposium on Lattice Field Theory, 8th-13th August, 2022, Rheinische Friedrich-Wilhelms-Universität Bonn, Bonn, Germany |
著作権等: | Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. |
URI: | http://hdl.handle.net/2433/284395 |
DOI(出版社版): | 10.22323/1.430.0154 |
出現コレクション: | 学術雑誌掲載論文等 |
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