7 pages, 21 figures. Talk given at the 34th International Symposium on Lattice Field Theory (Lattice 2016), 24-30 July 2016, Southampton, United Kingdom
We present lattice QCD results of baryon-baryon potentials in S=-3 sector, i.e., ΞΣ(I=3/2) potentials and ΞΛ-ΞΣcoupled channel potentials (I=1/2) by using the 2+1 flavor gauge configurations with almost the physical quark masses generated on 96^4 lattice with 1/a \simeq 2.3 GeV and L = 96a \simeq 8.1 fm where m_pi \simeq 146 MeV and m_K \simeq 525 MeV. These potentials are obtained based on the time-dependent HAL QCD method with a non-relativistic approximation. Qualitative behaviors of the results are found to be consistent with those in the flavor SU(3) limit.
In this work we present an efficient construction of baryon interpolating fields for lattice QCD computations of two and three point functions. These are essential building blocks of computations of nucleon parton distribution functions (PDFs), generalized parton distribution functions (GPDs) and transverse momentum dependent distributions functions (TMDs). Lattice QCD computations of these quantities can provide additional input to assist with the global fits on experimental data for determining TMDs, GPDs and PDFs.
We study negative-parity baryon spectra in quenched anisotropic lattice QCD. The negative-parity baryons are measured as the parity partner of the ground-state baryons. In addition to the flavor octet and decuplet baryons, we pay much attention to the flavor-singlet negative-parity baryon as a three-quark state and compare it with the Lambda(1405) baryon. Numerical results of the flavor octet and decuplet negative-parity baryon masses are close to experimental values of lowest-lying negative-parity baryons, while the flavor-singlet baryon is much heavier than Lambda(1405). This indicates that …
Finite size effect on vector meson and baryon sectors in 2+1 flavor QCD at the physical point
在2+1味QCD中，我们利用在物理点保持时空体积大于（10 fm $)^4$）的“PACS10”组态的子集，研究了矢量介子和重子扇区的有限尺寸效应.比较了在（5.5 fm）$)^4$和（10.9 fm）$)^4$晶格上的结果，发现在晶格上稳定的八重态重子的基态在小于0.5%的统计误差范围内不存在有限尺寸效应.对于那些在晶格上不稳定的矢量介子，我们观察到有效质量远低于（5.5 fm $)^4$和（10.9 fm $)^4$）晶格上的实验共振能级.对于十重态重子扇区，我们发现有效质量的时间依赖性与包括$Ω$重子通道的矢量介子扇区非常相似。我们讨论了它的起源，由于可能与附近的多强子态混合。由于$Ξ$重子质量可以用矢量介子和重子质量中最小的不确定性来确定，我们将它与π介子和K介子质量一起作为物理输入来确定物理点。
In this article, we review the HAL QCD method to investigate baryon-baryon interactions such as nuclear forces in lattice QCD. We first explain our strategy in detail to investigate baryon-baryon interactions by defining potentials in field theories such as QCD. We introduce the Nambu-Bethe-Salpeter (NBS) wave functions in QCD for two baryons below the inelastic threshold. We then define the potential from NBS wave functions in terms of the derivative expansion, which is shown to reproduce the scattering phase shifts correctly below the inelastic threshold. Using this definition, we formulate …
We present here continuum extrapolated results for all 2nd order cumulants using the most recent results obtained by the HotQCD collaboration in (2+1)-flavor QCD. We constrain the applicability of various HRG models by presenting a detailed comparison of our results based on different sets of hadron spectra as well as with virial expansion based model calculations. A comparison with our lattice QCD results for 2nd order cumulants with models that parametrize repulsive interactions among baryons and anti-baryons in a hadron resonance gas through a single excluded volume parameter (EVHRG) is als…
