Sigma terms and strangeness content of the nucleon with Nf = 2 + 1 + 1 twisted mass fermions

被引：0
作者：
Simon Dinter
Vincent Drach
Roberto Frezzotti
Gregorio Herdoiza
Karl Jansen
Giancarlo Rossi
机构：
[1] NIC,
[2] DESY,undefined
[3] Dip. di Fisica,undefined
[4] Università di Roma Tor Vergata and INFN Sez. di Roma Tor Vergata,undefined
[5] Departamento de Física Teórica and Instituto de Física Teórica UAM/CSIC,undefined
[6] Universidad Autónoma de Madrid,undefined
来源：
Journal of High Energy Physics | / 2012卷
关键词：
Lattice QCD; QCD;
D O I：
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摘要：
We study the nucleon matrix elements of the quark scalar-density operator using maximally twisted mass fermions with dynamical light (u,d), strange and charm degrees of freedom. We demonstrate that in this setup the nucleon matrix elements of the light and strange quark densities can be obtained with good statistical accuracy, while for the charm quark counterpart only a bound can be provided. The present calculation which is performed at only one value of the lattice spacing and pion mass serves as a technical feasibility study for a future computation of the scalar quark content of the nucleon with a detailed analysis of the systematics.[graphic not available: see fulltext]
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