Gluon contributions to the pion mass and light cone momentum fraction

Details Gluon contributions to the pion mass and light cone momentum fraction Gluon contributions to the pion mass and light cone momentum fraction

2007-07-21

arxiv.org/abs/0707.3225v1

Phys.Rev.D77:037501,2008

Physics

High Energy Physics

High Energy Physics - Lattice

4 pages, 2 figures

Scientific paper

10.1103/PhysRevD.77.037501

We calculate the matrix elements of the gluonic contributions to the energy-momentum tensor for a pion of mass 600 < Mpi < 1100 MeV in quenched lattice QCD. We find that gluons contribute (37 +/- 8 +/- 12)% of the pion's light cone momentum. The bare matrix elements corresponding to the trace anomaly contribution to the pion mass are also obtained. The discretizations of the energy-momentum tensor we use have other promising applications, ranging from calculating the origin of hadron spin to QCD thermodynamics.

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