Lattice study of quark and glue momenta and angular momenta in the nucleon
文献类型：期刊论文
| 作者 | XQCD Collaboration |
| 刊名 | PHYSICAL REVIEW D
 |
| 出版日期 | 2015 |
| 卷号 | 91期号:1页码:14505 |
| 英文摘要 | We report a complete calculation of the quark and glue momenta and angular momenta in the proton. These include the quark contributions from both the connected and disconnected insertions. The quark disconnected insertion loops are computed with Z(4) noise, and the signal-to-noise ratio is improved with unbiased subtractions. The glue operator is comprised of gauge-field tensors constructed from the overlap operator. The calculation is carried out on a 163 x 24 quenched lattice at beta = 6.0 for Wilson fermions with kappa = 0.154, 0.155, and 0.1555, which correspond to pion masses at 650, 538, and 478 MeV, respectively. The chirally extrapolated u and d quark momentum/angular momentum fraction is found to be 0.64(5)=0.70(5), the strange momentum/angular momentum fraction is 0.024(6)/0.023(7), and that of the glue is 0.33(6)/0.28(8). The previous study of quark spin on the same lattice revealed that it carries a fraction of 0.25(12) of proton spin. The orbital angular momenta of the quarks are then obtained from subtracting the spin from their corresponding angular momentum components. We find that the quark orbital angular momentum constitutes 0.47(13) of the proton spin with almost all of it coming from the disconnected insertions. |
| 学科主题 | Astronomy & Astrophysics; Physics |
| 类目[WOS] | Astronomy & Astrophysics ; Physics, Particles & Fields |
| 收录类别 | SCI |
| WOS记录号 | WOS:000348678700004 |
| 公开日期 | 2016-05-03 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/228140]  |
| 专题 | 高能物理研究所_理论物理室 |
| 推荐引用方式 GB/T 7714 | XQCD Collaboration. Lattice study of quark and glue momenta and angular momenta in the nucleon[J]. PHYSICAL REVIEW D,2015,91(1):14505. |
| APA | XQCD Collaboration.(2015).Lattice study of quark and glue momenta and angular momenta in the nucleon.PHYSICAL REVIEW D,91(1),14505. |
| MLA | XQCD Collaboration."Lattice study of quark and glue momenta and angular momenta in the nucleon".PHYSICAL REVIEW D 91.1(2015):14505. |
入库方式： OAI收割
来源：高能物理研究所
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