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1 vote
0 answers
147 views

Soft-gluon of scattering amplitude

The question from Scattering Amplitudes in Gauge Theory and Gravity page 46, equation (2.120) from which I can't get a consistent formula. I just calculate A3(gff) which two fermion and one gluon $A_n\...
shoow's user avatar
  • 11
4 votes
1 answer
1k views

Callan-Gross relation validity

The inelastic electron-proton scattering cross section can be written as $$\frac{d\sigma}{dE_2d\Omega}=\frac{\alpha^2}{4*E_1\sin^4{\frac{\theta}{2}}}(W_2\cos^2{{\frac{\theta}{2}}}+2W_1\sin^2{{\frac{\...
AxelAE's user avatar
  • 263
3 votes
0 answers
194 views

Conversion of QCD cross section formula

I'm writing a program to calculate NLO cross sections for semi-inclusive high-$p_T$ pion production in proton-proton-collisions for my bachelor thesis. I've got a paper describing the production ...
Benedikt's user avatar
  • 337