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Electromagnetic vertex function of the pion at T > 0

Dec, 2005

17 pages

Published in:

Eur.Phys.J.C 48 (2006) 589-596

e-Print:

hep-lat/0512035 [hep-lat]

DOI:

10.1140/epjc/s10052-006-0018-4

Report number:

NIKHEF-2005-031,
BI-TP-2005-53

View in:

ADS Abstract Service

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Abstract: (arXiv)

The matrix element of the electromagnetic current between pion states is calculated in quenched lattice QCD at a temperature of

T = 0.93 T_c

. The nonperturbatively improved Sheikholeslami-Wohlert action is used together with the corresponding

{\cal O}(a)

improved vector current. The electromagnetic vertex function is extracted for pion masses down to

360 {\rm MeV}

and momentum transfers

Q^2 \le 2.7 {\rm GeV}^2

.

fermion: lattice field theory
gauge field theory: SU(3)
approximation: quenching
finite temperature
vertex function: electromagnetic
pi: two-point function
meson: form factor
mass: screening
dispersion relation
numerical calculations: Monte Carlo

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