Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-07-18
PoS LHC07:002,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
Invited talk presented at the Workshop on High PT Physics at the LHC (LHC07), Jyvaskyla, Finland, 23-27 March 2007; typos corr
Scientific paper
I discuss a number of novel topics in QCD, including the use of the AdS/CFT correspondence between Anti-de Sitter space and conformal gauge theories to obtain an analytically tractable approximation to QCD in the regime where the QCD coupling is large and constant. In particular, there is an exact correspondence between the fifth-dimension coordinate z of AdS space and a specific impact variable zeta which measures the separation of the quark constituents within the hadron in ordinary space-time. This connection allows one to compute the analytic form of the frame-independent light-front wavefunctions of mesons and baryons, the fundamental entities which encode hadron properties and allow the computation of exclusive scattering amplitudes. I also discuss a number of novel phenomenological features of QCD. Initial- and final-state interactions from gluon-exchange, normally neglected in the parton model, have a profound effect in QCD hard-scattering reactions, leading to leading-twist single-spin asymmetries, diffractive deep inelastic scattering, diffractive hard hadronic reactions, the breakdown of the Lam Tung relation in Drell-Yan reactions, and nuclear shadowing and non-universal antishadowing--leading-twist physics not incorporated in the light-front wavefunctions of the target computed in isolation. I also discuss tests of hidden color in nuclear wavefunctions, the use of diffraction to materialize the Fock states of a hadronic projectile and test QCD color transparency, and anomalous heavy quark effects. The presence of direct higher-twist processes where a proton is produced in the hard subprocess can explain the large proton-to-pion ratio seen in high-centrality heavy-ion collisions.
No associations
LandOfFree
Novel QCD Phenomena does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Novel QCD Phenomena, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Novel QCD Phenomena will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-553356