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Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
Quark and Gluon Momentum Fractions in the Pion from N_{f}=2+1+1 Lattice QCD
Constantia Alexandrou1,2, Simone Bacchio2, Georg Bergner3
1Department of Physics, University of Cyprus, Nicosia 2109, Cyprus.
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 N_{f}=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[over ¯] scheme at 2 GeV. We find ⟨x⟩_{u+d}=0.601(28), ⟨x⟩_{s}=0.059(13), ⟨x⟩_{c}=0.019(05), and ⟨x⟩_{g}=0.52(11) for the separate contributions, respectively, whose sum saturates the momentum sum rule.
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