圈积分及相空间积分计算系列讲座

Conformal symmetry provides significant simplifications to loop calculations in QCD for non-forward kinematics. In this talk, I will explain the relevant ideas detailing the procedures for applying conformal symmetry in QCD. I will review some recent results obtained through the conformal technique, which are immediately applicable to EIC physics, and meson decays.

Soft collinear effective theory is an effective theory of QCD in the infrared regions. It has been used widely in the study of infrared divergnces of scattering amplitudes and of resummation of large logarithms in cross sectons. It helps one to obtain much information about the higher order corrections. The method of regions is another useful tool to calculate loop integrals up to certain...

Jet cross sections at high-energy colliders exhibit intricate patterns of logarithmically enhanced higher-order corrections. In particular, so-called non-global logarithms emerge from soft radiation emitted off energetic partons inside jets. While this is a single-logarithmic effect at lepton colliders, at hadron colliders phase factors in the amplitudes lead to double-logarithmic corrections...

The radiative leptonic B-meson decays are extremely important to the study of the exclusive B-meson decays. I will concentrate on the factorization properties of the radiative leptonic B decay with an energetic photon in the final states. Employing the method of regions, we can derive the factorization formula of the decay form factors at the leading power. The factorization formula could be...