arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0911.0159hep-ex
收藏

来自HERA的最新结果

Recent Results from HERA

A. Glazov

摘要:

HERA $ep$对撞机提供了关于质子结构的独特信息。高质心能量$s=320$ GeV提供了对低Bjorken- $x$域和高动量转移$Q$的区域的访问。最近,H1合作组报道了在低$x$下对结构函数$F_2$的高精度测量,导致对海夸克和胶子密度的严格限制。H1和ZEUS的合作测量的结构函数$F_L$,它提供了一个重要的交叉检查的传统QCD图片。这种测量最近被H1扩展到低$Q^2$,其中小的$x$校正可能起重要作用。通过结合H1和ZEUS合作的测量,实现了深度非弹性散射截面测量的最终精度。组合的数据被用作QCD拟合的唯一输入,以获得HERA PDF集。新的测量包容性$e^-p$中性和带电电流散射截面的ZEUS合作在高$Q^2$提高精度在这个运动学领域。DIS高$P_t$射流产生截面的H1分析用于确定强耦合常数$α_S$。通过HERMES合作使用标记的$K^{\pm}$生产,从总海中分离出奇异夸克密度。

英文摘要:

HERA $ep$ collider provides unique information on the proton structure. High center of mass energy $s=320$ GeV gives access to both the low Bjorken-$x$ domain and regime of high momentum transfers $Q$. Recently the H1 collaboration reported a high precision measurement of the structure function $F_2$ at low $x$ leading to tight constraints on the sea quark and gluon densities. Both the H1 and ZEUS collaborations measure the structure function $F_L$ which provides an important cross check of the conventional QCD picture. This measurement is recently extended by H1 to low $Q^2$ where small $x$ corrections may play important role. An ultimate precision of the deep inelastic scattering cross section measurement is achieved by combining the measurements of the H1 and ZEUS collaborations. The combined data are used as a sole input to a QCD fit to obtained HERA PDF set. New measurements of inclusive $e^-p$ neutral and charged current scattering cross sections by the ZEUS collaboration at high $Q^2$ improve precision in this kinematic domain. H1 analysis of the DIS high $P_t$ jet production cross section is used for a determination of the strong coupling constant $α_S$. Separation of the strange quark density from the total sea is obtained by the HERMES collaboration using tagged $K^{\pm}$ production.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑