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arXiv 1303.3063hep-phnucl-th
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用全球事件形状探测喷流产生中的核动力学

Probing nuclear dynamics in jet production with a global event shape

Zhong-Bo Kang, Xiaohui Liu, Sonny Mantry, Jian-Wei Qiu

备注：
49 pages, 13 Figures, journal version
发表信息：
Phys. Rev. D 88, 074020 (2013)
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摘要：

利用1-jettiness（τ_1）全局事件形状研究了电子-核碰撞e^- + N_A -> J + X中的单喷注产生。它包括量化的辐射在最终状态的模式，在宽角度的核束和最终状态喷流的软辐射的灵敏度提高，并促进了与否决权有关的大Sudakov矩阵的再确认。通过它们对观测到的辐射模式的影响，1-jettiness可以是一个有用的探针的核PDF和动力学效应在核介质中的功率校正。这种形式主义允许标准的射流形状分析，同时提供对来自射流的宽角度软辐射的灵敏度。在τ_1 P_{J_T}的范围内，我们对$τ_1$中的横截面微分以及喷流的横向动量（P_{J_T}）和快度（y）采用了因子分解框架。限制$τ_1 << P_{J_T}$只允许核束和喷流方向之间的软辐射，从而对额外的喷流起到否决作用。该区域对射流算法的细节也不敏感，从而允许对再膨胀进行更好的理论控制，同时提供对核介质效应的增强的灵敏度。我们给出了数值结果，在领先的扭曲，在下一个到下一个到领先的对数（NNLL）水平的准确性，为各种核目标的重混。这样的研究对于EIC和LHeC关于未来电子离子对撞机的建议是理想的，其中计划了一系列核目标。

英文摘要：

We study single jet production in electron-nucleus collisions e^- + N_A -> J + X, using the 1-jettiness (τ_1) global event shape. It inclusively quantifies the pattern of radiation in the final state, gives enhanced sensitivity to soft radiation at wide angles from the nuclear beam and final-state jet, and facilitates the resummation of large Sudakov logarithms associated with the veto on additional jets. Through their effect on the observed pattern of radiation, 1-jettiness can be a useful probe of nuclear PDFs and power corrections from dynamical effects in the nuclear medium. This formalism allows for the standard jet shape analysis while simultaneously providing sensitivity to soft radiation at wide angles from the jet. We use a factorization framework for cross-sections differential in $τ_1$ and the transverse momentum (P_{J_T}) and rapidity (y) of the jet, in the region τ_1<< P_{J_T}. The restriction $τ_1 << P_{J_T}$ allows only soft radiation between the nuclear beam and jet directions, thereby acting as a veto on additional jets. This region is also insensitive to the details of the jet algorithm, allowing for better theoretical control over resummation, while providing enhanced sensitivity to nuclear medium effects. We give numerical results at leading twist, with resummation at the next-to-next-to-leading logarithmic (NNLL) level of accuracy, for a variety of nuclear targets. Such studies would be ideal for the EIC and the LHeC proposals for a future electron-ion collider, where a range of nuclear targets are planned.

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