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SUMMARY:[Hybrid RBRC seminar] Trace anomaly form factor from lattice QCD
DTSTART:20240215T173000Z
DTEND:20240215T183000Z
DTSTAMP:20240815T002700Z
UID:indico-event-21779@indico.bnl.gov
CONTACT:rsufian1@bnl.gov\;mkurian@bnl.gov
DESCRIPTION:Speakers: Bigeng Wang (University of Kentucky/LBL)\n\nThe hadr
on mass can be obtained through the calculation of the trace of the energy
-momentum tensor (EMT) in the hadron which includes the trace anomaly and
sigma terms. The anomaly due to conformal symmetry breaking is believed to
be an important ingredient for hadron mass generation and confinement. In
this talk\, I will present the calculation of the glue part of the trace
anomaly form factors of the pion up to $Q^2\\sim 4.3~\\mathrm{GeV}^2$ and
the nucleon up to $Q^2\\sim 1~\\mathrm{GeV}^2$. The calculations are perfo
rmed on a domain wall fermion (DWF) ensemble with overlap valence quarks a
t 7 valence pion masses varying from $\\sim 250$ MeV to $\\sim 540$ MeV\,
including the unitary point $\\sim 340$ MeV. We calculate the radius of th
e glue trace anomaly for the pion and the nucleon from the $z$-expansion.
By performing a two-dimensional Fourier transform on the glue trace anomal
y form factors in the infinite momentum frame with no energy transfer\, we
also obtain their spatial distributions for several valence quark masses.
The results are extrapolated to the physical pion mass. We find the pion'
s form factor changes sign\, as does its spatial distribution\, for light
quark masses. This explains how the trace anomaly contribution to the pion
mass approaches zero toward the chiral limit.\n\narXiv reference: https:
//arxiv.org/abs/2401.05496\n\nhttps://indico.bnl.gov/event/21779/
LOCATION:2-160 ( https://bnl.zoomgov.com/j/1619458475?pwd=Z1VDdXVXcWF1eUhs
RDZObVJnME4rUT09)
URL:https://indico.bnl.gov/event/21779/
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