AdS/CFT and Exclusive Processes in QCD
The AdS/CFT correspondence between string theory in AdS space and conformal field theories in physical space-time leads to an analytic, semi-classical model for strongly-coupled QCD which has scale invariance and dimensional counting at short distances and color confinement at large distances. One can use holography to map the amplitude describing the hadronic state in the fifth dimension of Anti-de Sitter space AdS5 to the light-front wavefunctions of hadrons in physical space-time, thus providing a relativistic description of hadrons in QCD at the amplitude level. In particular, we show that there is an exact correspondence between the fifth-dimensional coordinate of AdS space z and a specific impact variable {var_sigma} which measures the separation of the quark and gluonic constituents within the hadron in ordinary space-time. New relativistic light-front equations in ordinary space-time can then be derived which reproduce the results obtained using the 5-dimensional theory. The effective light-front equations possess elegant algebraic structures and integrability properties. This connection between the AdS and the light-front representations allows one to compute the analytic form of the frame-independent light-front wavefunctions, the fundamental entities which encode hadron properties and allow the computation of decay constants, form factors, deeply virtual Compton scattering, exclusive heavy hadron decays and other exclusive scattering amplitudes. As specific examples we compute the pion coupling constant f{sub {pi}} and study the behavior of the pion form factor F{sub {pi}}(q{sup 2}) in the space and time-like regions. We also determine the Dirac nucleon form factors F{sup p}{sub 1}(q{sup 2}) and F{sup n}{sub 1} (q{sup 2}) in the space-like region.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76SF00515
- OSTI ID:
- 915370
- Report Number(s):
- SLAC-PUB-12804; arXiv:0709.2072; TRN: US200817%%485
- Resource Relation:
- Conference: Invited talk presented atWorkshop On Exclusive Reactions At High Momentum Transfer, , 5/21/2007-5/24/2007
- Country of Publication:
- United States
- Language:
- English
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