QCD EVOLUTION AND RESUMMATION FOR TRANSVERSE MOMENTUM DISTRIBUTION

2012 ◽  
Vol 20 ◽  
pp. 129-136
Author(s):  
ZHONG-BO KANG
Keyword(s):  
Transverse Momentum ◽  
Evolution Equation ◽  
Inelastic Scattering ◽  
Deep Inelastic Scattering ◽  
Perturbative Qcd ◽  
Momentum Distribution ◽  
Spin Asymmetry ◽  
Transverse Momentum Distribution ◽  
Transverse Spin ◽  
Production Processes

We review the relation between the QCD perturbative resummation and evolution. Particularly we emphasize briefly the idea on how to use the evolution equation to resum the important double logarithms appeared in the perturbative QCD expansion when the process involves two distinctive scales Q1 ≫ Q2. We present the resummation formalism for the single transverse spin asymmetry for both semi-inclusive deep inelastic scattering and Drell-Yan production processes.

COMPASS RESULTS ON TMD OBSERVABLES

2012 ◽  
Vol 20 ◽  
pp. 9-18
Author(s):  
◽  
ANNA MARTIN
Keyword(s):  
Transverse Momentum ◽  
Inelastic Scattering ◽  
Deep Inelastic Scattering ◽  
Muon Beam ◽  
Transverse Spin ◽  
Scientific Program ◽  
Fixed Target ◽  
Transverse Structure ◽  
Target Experiment ◽  
Fixed Target Experiment

The study of the transverse spin and transverse momentum structure of the nucleon is an important part of the scientific program of COMPASS, a fixed target experiment taking data at the CERN SPS since 2002. In these ten years COMPASS has produced a number of interesting results by measuring the forward going hadrons produced in deep inelastic scattering of a 160 GeV muon beam off polarized deuteron and proton targets. The COMPASS contribution to the understanding of the transverse structure of the nucleon, and the possible future contributions, are briefly reviewed here.

QCD EVOLUTION FOR TRANSVERSE MOMENTUM DEPENDENT OBSERVABLES

2014 ◽  
Vol 25 ◽  
pp. 1460008
Author(s):  
PENG SUN ◽  
FENG YUAN
Keyword(s):  
Transverse Momentum ◽  
Inelastic Scattering ◽  
Deep Inelastic Scattering ◽  
Cross Sections ◽  
Lepton Pair ◽  
Transverse Spin ◽  
Transverse Momentum Dependent ◽  
Spin Asymmetries ◽  
Hadronic Physics

In this talk, we presented our recent studies of the QCD evolution effects on the transverse momentum dependent observables in semi-inclusive deep inelastic scattering and Drell-Yan lepton pair productions. The evolution is first tested for the spin average cross sections, and then applied to the Sivers single transverse spin asymmetries. The latter are among the important topics in hadronic physics research in recent years.

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