Phys. Rev. D 77, 037501 (2008) [4 pages]Gluon contributions to the pion mass and light-cone-momentum fractionReceived 26 July 2007; published 4 February 2008 We calculate the matrix elements of the gluonic contributions to the energy-momentum tensor for a pion of mass 600<Mπ<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. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.77.037501
DOI:
10.1103/PhysRevD.77.037501
PACS:
12.38.Gc, 12.38.Aw, 12.40.Yx, 14.40.Aq
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