Dipole subtraction vs. phase space slicing in NLO NRQCD heavy-quarkonium production calculations

Mathias Butenschoen, Bernd A. Kniehl
2020 Nuclear Physics B  
We compare two approaches to evaluate cross sections of heavy-quarkonium production at next-toleading order in nonrelativistic QCD involving Sand P -wave Fock states: the customary approach based on phase space slicing and the approach based on dipole subtraction recently elaborated by us. We find reasonable agreement between the numerical results of the two implementations, but the dipole subtraction implementation outperforms the phase space slicing one both with regard to accuracy and speed.
doi:10.1016/j.nuclphysb.2020.115056 fatcat:hfncmcrnmfdprp6u6777w6sf2q