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| Energy-Energy Correlation in QCD |
| 2018-03-14
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CAS Key Laboratory of Theoretical Physics |
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Institute of Theoretical Physics |
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Chinese Academy of Sciences |
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Seminar |
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Title
题目 |
Energy-Energy Correlation in QCD |
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Speaker
报告人 |
HuaXing Zhu |
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Affiliation
所在单位 |
Zhejiang University |
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Date
日期 |
2:30pm, Mar 14, 2018, Wednesday |
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Venue
地点 |
Conference room 322, ITP |
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Abstract
摘要 |
Energy-Energy Correlation (EEC) measures the energy correlation between two detector calorimeters in e+e- annihilation to hadrons. It is one of the event shape observables proposed in the early days of QCD to understand the property of asymptotic freedom, and later becomes a precision observable for the extraction of strong coupling constant from high energy scattering. EEC was computed analytically at leading order in QCD almost 40 years ago, and numerically at next-to-leading order (NLO) starting in the 1980s. In this talk I describe the first analytical result for the EEC at NLO, which is remarkably simple. This is also the first NLO result for event shape observables in QCD. I then discuss the EEC in the limit where the two calorimeters are placed in the almost back-to-back limit. Remarkably, this region is governed by transverse-momentum-dependent parton fragmentation. Thanks to progress in understanding the transverse-momentum spectrum of Higgs boson production at the LHC, large logarithms in this region can be resummed to next-to-next-to-next-to leading logarithms. Lastly, I will comment on the expansion of EEC in the forward limit, as well as a non-physical limit that imposes strong constraint to the functional form of perturbative EEC. |
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Contact person
所内联系人 |
Gang Yang |
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