arXiv 1611.034212016-11hep-exhep-ph

HERA深度非弹性ep散射中喷流产生截面的测量

Measurement of Jet Production Cross Sections in Deep-inelastic ep Scattering at HERA

The H1 collaboration

备注：: 58 pages, 21 figures, with changes described in the erratum submitted to EPJC

摘要：

利用HERA的H1探测器获得的数据，对光子虚度$5.5<Q^2<80\,{\rm GeV}^2$和非弹性度$0.2<y<0.6$的中性流深度非弹性散射中的喷流截面进行了精确测量，对应的积分亮度光度为$290\,{\rm pb}^{-1}$。双微分包容射流，dijet和trijet截面的同时测量，并作为一个函数的射流横向动量观测值和作为一个函数的$Q^2$。在各自的$Q^2$ -间隔中归一化到包容性中性电流DIS横截面的射流截面也被确定。本文将以往在$150<Q^2<15\,000\,{\rm GeV}^2$范围内的包容射流截面的结果推广到低横向射流动量$5<P_{T}^{\rm jet}<7\,{\rm GeV}$。的数据进行了比较，从微扰QCD的预测，在下一个领先的顺序在强耦合，在近似下一个下一个领先的顺序和完全下一个下一个领先的顺序。还利用最近发表的H1喷流数据在高值的$Q^2$，强耦合常数$α_s(M_Z)$确定在次领先的顺序。

英文摘要：

A precision measurement of jet cross sections in neutral current deep-inelastic scattering for photon virtualities $5.5<Q^2<80\,{\rm GeV}^2$ and inelasticities $0.2<y<0.6$ is presented, using data taken with the H1 detector at HERA, corresponding to an integrated luminosity of $290\,{\rm pb}^{-1}$. Double-differential inclusive jet, dijet and trijet cross sections are measured simultaneously and are presented as a function of jet transverse momentum observables and as a function of $Q^2$. Jet cross sections normalised to the inclusive neutral current DIS cross section in the respective $Q^2$-interval are also determined. Previous results of inclusive jet cross sections in the range $150<Q^2<15\,000\,{\rm GeV}^2$ are extended to low transverse jet momenta $5<P_{T}^{\rm jet}<7\,{\rm GeV}$. The data are compared to predictions from perturbative QCD in next-to-leading order in the strong coupling, in approximate next-to-next-to-leading order and in full next-to-next-to-leading order. Using also the recently published H1 jet data at high values of $Q^2$, the strong coupling constant $α_s(M_Z)$ is determined in next-to-leading order.

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英文摘要：

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