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.

scholarly journals Studies of Backward Particle Production with a Fixed-Target Experiment Using the LHC Beams

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Federico Alberto Ceccopieri
Keyword(s):  
Inelastic Scattering ◽  
Deep Inelastic Scattering ◽  
Basic Concept ◽  
Particle Production ◽  
Fixed Target ◽  
Target Fragmentation ◽  
Target Experiment ◽  
The One ◽  
Hadronic Collisions ◽  
Fixed Target Experiment

The foreseen capability to cover the far backward region at a Fixed-Target Experiment using the LHC beams allows one to explore the dynamics of the target fragmentation in hadronic collisions. In this report we briefly outline the required theoretical framework and discuss a number of studies of forward and backward particle production. By comparing this knowledge with the one accumulated in Deep Inelastic Scattering on target fragmentation, the basic concept of QCD factorisation could be investigated in detail.

TRANSVERSE SPIN AND TRANSVERSE MOMENTUM EFFECTS AT COMPASS

2009 ◽  
Vol 24 (35n37) ◽  
pp. 3015-3024 ◽  
Author(s):  
FRANCO BRADAMANTE
Keyword(s):  
Transverse Momentum ◽  
Muon Beam ◽  
Transverse Spin ◽  
Fixed Target ◽  
Deuteron Target ◽  
Spin Asymmetries ◽  
Single Spin ◽  
Polarized Target ◽  
Single Spin Asymmetries ◽  
Target Experiment

The study of transverse spin and transverse momentum effects is part of the scientific program of COMPASS, a fixed target experiment at the CERN SPS. For these studies, a 160 GeV/c momentum muon beam is scattered on a transversely polarized nucleon target, and the scattered muon and the forward going hadrons produced in DIS processes are reconstructed and identified in a magnetic spectrometer. The measurements have been performed on a deuteron target in 2002, 2003 and 2004, and on a proton target in 2007. The main results obtained measuring single spin asymmetries are reviewed, with particular emphasis on the most recent proton measurements. After two years of spectroscopy measurements with hadron beams, in 2008 and 2009, the Collaboration will resume measurements with the muon beam and a transversely polarized target in 2010.

scholarly journals Studies of Transverse-Momentum-Dependent Distributions with a Fixed-Target ExpeRiment Using the LHC Beams (AFTER@LHC)

2016 ◽  
Vol 40 ◽  
pp. 1660107 ◽  
Author(s):  
L. Massacrier ◽  
M. Anselmino ◽  
R. Arnaldi ◽  
S. J. Brodsky ◽  
V. Chambert ◽  
...  
Keyword(s):  
Transverse Momentum ◽  
Nuclear Physics ◽  
Transverse Spin ◽  
Fixed Target ◽  
Transverse Momentum Dependent ◽  
Spin Asymmetries ◽  
Bent Crystal ◽  
Target Mode ◽  
Target Experiment ◽  
Fixed Target Experiment

We report on the studies of Transverse-Momentum-Dependent distributions (TMDs) at a future fixed-target experiment –AFTER@LHC– using the [Formula: see text] or Pb ion LHC beams, which would be the most energetic fixed-target experiment ever performed. AFTER@LHC opens new domains of particle and nuclear physics by complementing collider-mode experiments, in particular those of RHIC and the EIC projects. Both with an extracted beam by a bent crystal or with an internal gas target, the luminosity achieved by AFTER@LHC surpasses that of RHIC by up to 3 orders of magnitude. With an unpolarised target, it allows for measurements of TMDs such as the Boer-Mulders quark distributions and the distribution of unpolarised and linearly polarised gluons in unpolarised protons. Using polarised targets, one can access the quark and gluon Sivers TMDs through single transverse-spin asymmetries in Drell-Yan and quarkonium production. In terms of kinematics, the fixed-target mode combined with a detector covering [Formula: see text] allows one to measure these asymmetries at large [Formula: see text] in the polarised nucleon.

scholarly journals Feasibility Studies for Single Transverse-Spin Asymmetry Measurements at a Fixed-Target Experiment Using the LHC Proton and Lead Beams (AFTER@LHC)

2017 ◽  
Vol 58 (4) ◽  
Author(s):  
Daniel Kikoła ◽  
Miguel García Echevarria ◽  
Cynthia Hadjidakis ◽  
Jean-Philippe Lansberg ◽  
Cédric Lorcé ◽  
...  
Keyword(s):  
Spin Asymmetry ◽  
Feasibility Studies ◽  
Transverse Spin ◽  
Fixed Target ◽  
Target Experiment ◽  
Fixed Target Experiment

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.

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.

scholarly journals Spin physics at a fixed-target experiment at the LHC (AFTER@LHC)

2014 ◽  
Vol 45 (1) ◽  
pp. 336-337 ◽  
Author(s):  
A. Rakotozafindrabe ◽  
M. Anselmino ◽  
R. Arnaldi ◽  
S. J. Brodsky ◽  
V. Chambert ◽  
...  
Keyword(s):  
Fixed Target ◽  
Spin Physics ◽  
Target Experiment ◽  
Fixed Target Experiment
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