Topical Seminar on Frontier o f Particle Physics 2004: QCD and Light Hadrons Lecture 2 Wei Zhu East China Normal University
Jan 02, 2016
Topical Seminar on Frontier of Particle Physics 2004: QCD and Light Had
rons Lecture 2
Wei ZhuEast China Normal University
2. A simplest derivation of BFKL equationsBjorken fram
eThe virtual probe has almost zero-energy and zero-longitudinal momentum, so that the momentum of the probe is mainly transverse to the nucleon direction.
Resolution of probe
At small x and fixed Q2, beyond impulse approximation
DGLAP amplitude (for gluon)
Impulse approximation
NQ xx
What will happen?
BFKL equation
We separated out the probe vertex using the W -W approximation, where the transverse momenta of initial gluons are unvanished.
Note that z1 >>z2 at the LLA(1/x), we insert δ(z1 -1) and obtain the evolution equation
where y = ln(1/z) and