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arXiv hep-ex/0209010hep-ex
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深部非弹性散射中的三射流产生

Three-Jet Production in Deep-Inelastic Scattering

Christian Schwanenberger

摘要:

研究了正电子-质子深度非弹性散射中的三喷注产生。用HERA的H1探测器进行的测量覆盖了大范围的四动量转移平方5 < Q^2 < 5000 GeV^2和不变三喷流质量25 < M_(3 jet)< 140 GeV。喷流由Breit框架中的包含性k_T算法定义。三喷流截面的大小以及三喷流与双喷流截面之比R_(3/2)在整个相空间上都由次领先阶微扰QCD的预言来描述。角喷流分布的形状明显偏离可用相空间的均匀分布,但通过QCD计算得到了很好的描述。

英文摘要:

Three-jet production has been studied in deep-inelastic positron-proton scattering. The measurement carried out with the H1 detector at HERA covers a large range of four-momentum transfer squared 5 < Q^2 < 5000 GeV^2 and invariant three-jet masses 25 < M_(3jet) < 140 GeV. Jets are defined by the inclusive k_T algorithm in the Breit frame. The size of the three-jet cross section and the ratio of the three-jet to the dijet cross section R_(3/2) are described over the whole phase space by the predictions of perturbative QCD in next-to-leading order. The shapes of angular jet distributions deviate significantly from a uniform population of the available phase space but are well described by the QCD calculation.

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