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arXiv 0705.1931hep-ex
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在HERA深度非弹性散射中低$x_{\rm Bj}$下的多喷流产生

Multijet production at low $x_{\rm Bj}$ in deep inelastic scattering at HERA

ZEUS Collaboration, S. Chekanov

摘要:

测量了$10<Q^2<100$ GeV $^2$和低Bjorken $x$,$10^{-4}<x_{\rm Bj}<10^{-2}$在深度非弹性$ep$散射中包含的双射流和三射流的产生。这些数据是在HERA $ep$对撞机上使用ZEUS探测器以质量中心能量$\sqrt{s} = 318 \gev$获得的,对应于$82 {\rm pb}^{-1}$的积分光度。在强子质心框架下,采用纵向不变包容模式下的$k_{T}$聚类算法对喷流进行了识别。双射流和三射流微分截面的测量作为$Q^2$,$x_{\rm Bj}$,喷流横向能量和喷流赝快度的函数。作为对低$x_{\rm Bj}$动力学的进一步研究,本文还给出了作为喷流横动量、方位角和赝快度相关函数的多重微分截面。在$\mathcal{O}(α_{s}^3)$的计算通常很好地描述了三射流数据,并且与在$\mathcal{O}(α_{s}^2)$的计算相比,改进了对双射流数据的描述。

英文摘要:

Inclusive dijet and trijet production in deep inelastic $ep$ scattering has been measured for $10<Q^2<100$ GeV$^2$ and low Bjorken $x$, $10^{-4}<x_{\rm Bj}<10^{-2}$. The data were taken at the HERA $ep$ collider with centre-of-mass energy $\sqrt{s} = 318 \gev$ using the ZEUS detector and correspond to an integrated luminosity of $82 {\rm pb}^{-1}$. Jets were identified in the hadronic centre-of-mass (HCM) frame using the $k_{T}$ cluster algorithm in the longitudinally invariant inclusive mode. Measurements of dijet and trijet differential cross sections are presented as functions of $Q^2$, $x_{\rm Bj}$, jet transverse energy, and jet pseudorapidity. As a further examination of low-$x_{\rm Bj}$ dynamics, multi-differential cross sections as functions of the jet correlations in transverse momenta, azimuthal angles, and pseudorapidity are also presented. Calculations at $\mathcal{O}(α_{s}^3)$ generally describe the trijet data well and improve the description of the dijet data compared to the calculation at $\mathcal{O}(α_{s}^2)$.

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。

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