Quarkonium Physics at a Fixed-Target Experiment using the LHC Beams

• Autor: Lansberg, J. P. ; Brodsky, S. J. ; Fleuret, F. ; Hadjidakis, C.
• Assuntos: Atomic ; Hadrons ; Heavy Ions ; Molecular ; Nuclear Physics ; Optical and Plasma Physics ; Particle and Nuclear Physics ; Particle physics ; Physics ; Physics and Astronomy
• É parte de: Few-body systems, 2012-07, Vol.53 (1-2), p.11-25
• Descrição: We outline the many quarkonium-physics opportunities offered by a multi-purpose fixed-target experiment using the p and Pb Large Hadron Collider (LHC) beams extracted by a bent crystal. This provides an integrated luminosity of 0.5 fb −1 per year on a typical 1 cm-long target. Such an extraction mode does not alter the performance of the collider experiments at the LHC. With such a high luminosity, one can analyse quarkonium production in great details in pp , pd and pA collisions at GeV and at GeV in Pb A collisions. In a typical pp ( pA ) run, the obtained quarkonium yields per unit of rapidity are 2–3 orders of magnitude larger than those expected at RHIC and about, respectively, 10(70) times larger than for ALICE. In Pb A , they are comparable. By instrumenting the target-rapidity region, the large negative- x F domain can be accessed for the first time, greatly extending previous measurements by Hera-B and E866. Such analyses should help resolving the quarkonium-production controversies and clear the way for gluon PDF extraction via quarkonium studies. The nuclear target-species versatility provides a unique opportunity to study nuclear matter and the features of the hot and dense matter formed in Pb A collisions. A polarised proton target allows the study of transverse-spin asymmetries in J / ψ and production, providing access to the gluon and charm Sivers functions.
  
• Editor: Vienna: Springer Vienna
  
• Idioma: Inglês