2 research outputs found
Light-Front Holography and Hadronization at the Amplitude Level
The correspondence between theories in anti-de Sitter space and conformal
field theories in physical space-time leads to an analytic, semiclassical model
for strongly-coupled QCD which has scale invariance at short distances and
color confinement at large distances. Light-front holography is a remarkable
feature of AdS/CFT: it allows hadronic amplitudes in the AdS fifth dimension to
be mapped to frame-independent light-front wavefunctions of hadrons in physical
space-time, thus providing a relativistic description of hadrons at the
amplitude level. Some novel features of QCD are discussed, including the
consequences of confinement for quark and gluon condensates and the behavior of
the QCD coupling in the infrared. We suggest that the spatial support of QCD
condensates is restricted to the interior of hadrons, since they arise due to
the interactions of confined quarks and gluons. Chiral symmetry is thus broken
in a limited domain of size of the inverse pion mass in analogy to the limited
physical extent of superconductor phases. A new method for computing the
hadronization of quark and gluon jets at the amplitude level, an event
amplitude generator, is outlined.Comment: Presented by SJB at the Sixth International Conference on
Perspectives in Hadronic Physics, 12 - 16 May 2008, Miramare - Trieste, Ital
AdS/QCD and its Holographic Light-Front Partonic Representation
Starting from the Hamiltonian equation of motion in QCD we find a single
variable light-front equation for QCD which determines the eigenspectrum and
the light-front wavefunctions of hadrons for general spin and orbital angular
momentum. This light-front wave equation is equivalent to the equations of
motion which describe the propagation of spin- modes on anti-de Sitter (AdS)
space.Comment: 5 pages, 1 figure. Presented by GdT at Diffraction 2008,
International Workshop on Diffraction in High Energy Physic