Forward jet production in deep inelastic ep scattering and low-x parton dynamics at HERA
Forward jet production in deep inelastic ep scattering and low-x parton dynamics at HERA
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HERA 深层非弹性 ep 散射和低 x 部分子动力学中的正向射流产生
DOI：
10.1016/j.physletb.2005.09.066
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发表时间：
2006
影响因子：
4.4
通讯作者：
Chekanov S
中科院分区：
文献类型：
--
作者：
Chekanov S
中性流深度非弹性ep散射中的微分包含喷流截面已经用ZEUS探测器测量，积分光度为38.7 pb−1。喷流是在实验室坐标系中用纵向不变包容模式下的kTcluster算法识别出来的;喷流的横向能量ETjet大于6 GeV，喷流的伪快度ηjet介于−1和3之间。测量的横截面作为ETjet，Björken x和光子虚拟性，Q2的函数，提出。已经选择了三个相空间区域，以研究部分子动力学从最全球性的最限制性区域的前向（接近质子束方向）射流在低x，BFKL演变的影响可能存在。的测量结果进行了比较的领导对数部分子簇射蒙特卡罗模型和固定阶微扰QCD计算的预测。在正向区域，O（αs1）QCD计算在低x下低估了数据达一个数量级。通过引入O（αs2）QCD修正，得到了对该区域数据的改进描述，它解释了最低阶t介子通道胶子交换图，突出了这些项在低x下部分子动力学中的重要性。
Differential inclusive jet cross sections in neutral current deep inelastic ep scattering have been measured with the ZEUS detector using an integrated luminosity of 38.7 pb−1. The jets have been identified using the kTcluster algorithm in the longitudinally invariant inclusive mode in the laboratory frame; they have been selected with jet transverse energy, ETjetabove 6 GeV and jet pseudorapidity, ηjet, between −1 and 3. Measurements of cross sections as functions of ETjet, Björken x and the photon virtuality, Q2, are presented. Three phase-space regions have been selected in order to study parton dynamics from the most global to the most restrictive region of forward-going (close to the proton-beam direction) jets at low x, where the effects of BFKL evolution might be present. The measurements have been compared to the predictions of leading-logarithm parton-shower Monte Carlo models and fixed-order perturbative QCD calculations. In the forward region, O(αs1) QCD calculations underestimate the data up to an order of magnitude at low x. An improved description of the data in this region is obtained by including O(αs2) QCD corrections, which account for the lowest-order tˆ-channel gluon-exchange diagrams, highlighting the importance of such terms in the parton dynamics at low x.