تقرير
The nucleon spin and momentum decomposition using lattice QCD simulations
| العنوان: | The nucleon spin and momentum decomposition using lattice QCD simulations |
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| المؤلفون: | Alexandrou, C., Constantinou, M., Hadjiyiannakou, K., Jansen, K., Kallidonis, C., Koutsou, G., Avilés-Casco, A. Vaquero, Wiese, C. |
| المصدر: | Phys. Rev. Lett. 119, 142002 (2017) |
| سنة النشر: | 2017 |
| المجموعة: | High Energy Physics - Experiment High Energy Physics - Lattice High Energy Physics - Phenomenology Nuclear Experiment Nuclear Theory |
| مصطلحات موضوعية: | High Energy Physics - Lattice, High Energy Physics - Experiment, High Energy Physics - Phenomenology, Nuclear Experiment, Nuclear Theory |
| الوصف: | We determine within lattice QCD, the nucleon spin carried by valence and sea quarks, and gluons. The calculation is performed using an ensemble of gauge configurations with two degenerate light quarks with mass fixed to approximately reproduce the physical pion mass. We find that the total angular momentum carried by the quarks in the nucleon is $J_{u+d+s}{=}0.408(61)_{\rm stat.}(48)_{\rm syst.}$ and the gluon contribution is $J_g {=}0.133(11)_{\rm stat.}(14)_{\rm syst.}$ giving a total of $J_N{=}0.54(6)_{\rm stat.}(5)_{\rm syst.}$ consistent with the spin sum. For the quark intrinsic spin contribution we obtain $\frac{1}{2}\Delta \Sigma_{u+d+s}{=}0.201(17)_{\rm stat.}(5)_{\rm syst.}$. All quantities are given in the $\overline{\textrm{MS}}$ scheme at 2~GeV. The quark and gluon momentum fractions are also computed and add up to $\langle x\rangle_{u+d+s}+\langle x\rangle_g{=}0.804(121)_{\rm stat.}(95)_{\rm syst.}+0.267(12)_{\rm stat.}(10)_{\rm syst.}{=}1.07(12)_{\rm stat.}(10)_{\rm syst.}$ satisfying the momentum sum. Comment: Version published in PRL |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevLett.119.142002 |
| URL الوصول: | http://arxiv.org/abs/1706.02973 |
| رقم الأكسشن: | edsarx.1706.02973 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevLett.119.142002 |
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