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Energy-Energy Correlation in QCD
2018-03-14  【 】【打印】【关闭

CAS Key Laboratory of Theoretical Physics

Institute of Theoretical Physics

 Chinese Academy of Sciences

Seminar

Title

题目

Energy-Energy Correlation in QCD

Speaker

报告人

HuaXing Zhu

Affiliation

所在单位

Zhejiang University

Date

日期

2:30pm, Mar 14, 2018, Wednesday

Venue

地点

Conference room 322, ITP

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.

Contact person

所内联系人

Gang Yang

 

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