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Quark contribution to the proton spin from 2+1+1-flavor lattice QCD · Around

2018

Quark contribution to the proton spin from 2+1+1-flavor lattice QCD

Lin, Huey-Wen, Gupta, Rajan, Yoon, Boram et al.

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We present the first chiral-continuum extrapolated up, down and strange quark spin contribution to the proton spin using lattice QCD.

For the connected contributions, we use eleven ensembles of 2+1+1-flavor of Highly Improved Staggered Quarks (HISQ) generated by the MILC Collaboration.
They cover four lattice spacings $a \approx \{0.15,0.12,0.09,0.06\}$ fm and three pion masses, $M_\pi \approx \{315,220,135\}$ MeV, of which two are at the physical pion mass.
The disconnected strange calculations are done on seven of these ensembles, covering the four lattice spacings but only one with the physical pion mass.

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