A QCD analysis of ZEUS data including DIS inclusive cross sections with longitudinally polarised leptons and data run at lower proton beam energies
A M Cooper-Sarkar
备注：
Invited talk on behalf of the ZEUS Collaboration at DIS 2009, The 17th International Workshop on Deep Inelastic Scattering, Madrid, April 2009. % pages, 6 figures
New ZEUS data are added into the NLO QCD analysis of the ZEUS-JETS PDF fit. The addition of high-$Q^2$ NC and CC $e^-p$ inclusive cross-section data improves the determination of the $u$-valence quark at high $x$. The addition of high-$Q^2$ CC $e^+p$ inclusive cross-section data improves the determination of the $d$-valence quark at high $x$. The addition of lower-$Q^2$ NC $e^+p$ inclusive cross-section data, run at three different proton beam energies, improves the determination of the sea and gluon PDFs at small $x$. The new PDF fit is called the ZEUS09 PDF fit.
Helicity-dependent parton distribution functions at next-to-next-to-leading order accuracy from inclusive and semi-inclusive deep-inelastic scattering data
本文研究了深度非弹性衍射散射e + p -> e + \tilde{p} + X中的方位角关联。ep截面与强子末态中轻子平面和某个方向之间的夹角的关系可以写成一个简单的形式;它的测量可以用来约束纵向极化光子的截面。利用Landshoff和Nachtmann的非微扰双胶子交换模型，计算了衍射双喷注产生中喷注方位角的分布，并发现通过测量可以得到这类事件的纵向截面的有用界。然后，我们讨论了该模型的预测的依赖性的ep截面上的质子残留物的方位角\tilde{p}，其中包含有关螺旋度内容的坡密子。
Small-$x$ factorisation in the target fragmentation region
SUBATECH UMR 6457 (IMT Atlantique, Université de Nantes, IN2P3/CNRS)（苏巴特克联合研究实验室（大西洋理工大学，南特大学，法国国家科学研究中心））；Temple University（天普大学）；RIKEN-BNL Research Center, Brookhaven National Laboratory（理化学研究所-布鲁克海文联合研究中心，布鲁克海文国家实验室）；Physics Department, Brookhaven National Laboratory（布鲁克海文国家实验室物理系）；Institute for Nuclear Theory, University of Washington（华盛顿大学核理论研究所）
