Quark and gluon momentum fractions in the pion from Nf=2+1+1 lattice QCD
Abstract
We perform the first full decomposition of the pion momentum into its gluon and quark contributions. We employ an ensemble generated by the Extended Twisted Mass Collaboration with Nf=2 + 1 +1 Wilson twisted mass clover fermions at maximal twist tuned to reproduce the physical pion mass. We present our results in the MS scheme at 2. We find u+d=0.601(28), s=0.059(13), c=0.019(05), and g=0.52(11) for the separate contributions, respectively, whose sum saturates the momentum sum rule.
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