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https://hdl.handle.net/2440/10994
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Type: | Journal article |
Title: | Quark-gluon vertex from lattice QCD |
Author: | Skullerud, J. Kizilersu, A. |
Citation: | The Journal of High Energy Physics, 2002; 9(9):www 1-www 32 |
Publisher: | Editrice Compositori Bologna |
Issue Date: | 2002 |
ISSN: | 1029-8479 1029-8479 |
Statement of Responsibility: | Skullerud, Jonivar ; Kizilersu, Ayse |
Abstract: | The quark-gluon vertex in Landau gauge is studied in the quenched approximation using the Sheikholeslami-Wohlert (SW) fermion action with mean-field improvement coefficients in the action and for the quark fields. We see that the form factor that includes the running coupling is substantially enhanced in the infrared, over and above the enhancement arising from the infrared suppression of the quark propagator alone. We define two different momentum subtraction renormalisation schemes - MOM̃ (asymmetric) and MOM̄ (symmetric) - and determine the running coupling in both schemes. We find ΛNf=0/MS = 300-180+150 ± 55 ± 30 MeV from the asymmetric scheme. This is somewhat higher than other determinations of this quantity, but the uncertainties - both statistical and systematic - are large. In the symmetric scheme, statistical noise prevents us from obtaining a meaningful estimate for ΛMS̄. © SISSA/ISAS 2002. |
DOI: | 10.1088/1126-6708/2002/09/013 |
Published version: | http://dx.doi.org/10.1088/1126-6708/2002/09/013 |
Appears in Collections: | Aurora harvest 7 Special Research Centre for the Subatomic Structure of Matter publications |
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