108 research outputs found
Towards the continuum limit of nucleon form factors at the physical point using lattice QCD
We present results for the axial charge and root-mean-square (RMS) radii of
the nucleon obtained from 2+1 flavor lattice QCD at the physical point with a
large spatial extent of about 10 fm. Our calculations are performed with the
PACS10 gauge configurations generated by the PACS Collaboration with the six
stout-smeared improved Wilson-clover quark action and Iwasaki gauge
action at = 1.82 and 2.00 corresponding to lattice spacings of 0.085 fm
and 0.063 fm respectively. We first evaluate the value of , which is
not renormalized in the continuum limit and thus ends up with the renormalized
axial charge. Moreover, we also calculate the nucleon elastic form factors and
determine three kinds of isovector RMS radii such as electric, magnetic and
axial ones at the two lattice spacings. We finally discuss the discretization
uncertainties on renormalized axial charge and isovector RMS radii towards the
continuum limit.Comment: 9 pages, 2 figures, Proceeding for the 39th International Symposium
on Lattice Field Theory, 8th-13th August 2022, Bonn, German
Discretization effects on nucleon root-mean-square radii from lattice QCD at the physical point
We present results for the axial-vector coupling and root-mean-square (RMS)
radii of the nucleon obtained from 2+1 flavor lattice QCD at the physical point
with a large spatial extent of about 10 fm. Our calculations are performed with
the PACS10 gauge configurations generated by the PACS Collaboration with the
six stout-smeared improved Wilson-clover quark action and Iwasaki gauge
action at = 1.82 and 2.00 corresponding to lattice spacings of 0.085 fm
and 0.063 fm, respectively. We first evaluate the value of the axial-vector
coupling of the nucleon (). In addition, the isovector electric, magnetic
and axial radii and magnetic moment from the corresponding form factors are
also determined. Combining the results at and , we finally
discuss the finite lattice spacing effect. It was found that the effect on
is kept smaller than the statistical error of 2% while the effect on the
isovector radii was observed as a possible discretization error of about 10%,
regardless of the channel.Comment: 7 pages, 1 figure, Proceeding for the 40th International Symposium on
Lattice Field Theory, 31 July 2023 - 4 August 2023, Chicago, US
Tsunami field survey of the 1992 Nicaragua earthquake
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/95368/1/eost9614.pd
Nucleon scalar and tensor couplings from lattice QCD at the physical points
We present results for the axial, scalar and tensor isovector-couplings (gA, gS and gT) of the nucleon obtained from 2+1 flavor QCD with the physical light quark masses (Mπ = 135 MeV). Our calculations are performed at a single lattice spacing of 0.085 fm, but with two large volumes of (10.9 fm)4 and (5.5 fm)4. The configurations are generated by the PACS Collaboration with nonperturbatively (a) improved Wilson quark action and Iwasaki gauge action. The result of gA is a good indicator for determination of gS and gT with respect to accuracy and precision. Our result of gA well reproduces the experimental value within a statistical error of less than 2%. As for gS and gT, we compute the renormalization constants at the scale of 2 GeV in the ̅M̅S scheme through the RI/SMOM(γμ) intermediate scheme, and then obtain gS = 0.927(83)stat(22)syst and gT = 1.036(6)stat(20)syst
Alterations in cellular and organellar phospholipid compositions of HepG2 cells during cell growth.
The human hepatoblastoma cell line, HepG2, has been used for investigating a wide variety of physiological and pathophysiological processes. However, less information is available about the phospholipid metabolism in HepG2 cells. In the present report, to clarify the relationship between cell growth and phospholipid metabolism in HepG2 cells, we examined the phospholipid class compositions of the cells and their intracellular organelles by using enzymatic fluorometric methods. In HepG2 cells, the ratios of all phospholipid classes, but not the ratio of cholesterol, markedly changed with cell growth. Of note, depending on cell growth, the phosphatidic acid (PA) ratio increased and phosphatidylcholine (PC) ratio decreased in the nuclear membranes, the sphingomyelin (SM) ratio increased in the microsomal membranes, and the phosphatidylethanolamine (PE) ratio increased and the phosphatidylserine (PS) ratio decreased in the mitochondrial membranes. Moreover, the mRNA expression levels of enzymes related to PC, PE, PS, PA, SM and cardiolipin syntheses changed during cell growth. We suggest that the phospholipid class compositions of organellar membranes are tightly regulated by cell growth. These findings provide a basis for future investigations of cancer cell growth and lipid metabolism
- …