Unraveling the Structure of Hadrons with Effective Field Theories of QCD
Effective Field theory is a powerful framework based on controlled expansions for problems with a natural separation of energy scales. This technique is particularly important for QCD, the theory of strong interactions, due to the vast diversity of phenomena that it describes. Stewart and collaborators have invented a new class of effective theories that can be used in processes with energetic hadrons. These Soft-Collinear Effective Theories provide a unified framework for describing hadronic processes which involve hard probes or the release of a large amount of energy. Many interesting issues about hadronic physics can be addressed with the soft-collinear effective theory. Examples include the size and shape of hadronic form factors, the universality of hadronic distribution functions for a plethora of processes, and the importance of subleading corrections at intermediate energy scales. Effective field theories allow these issues to be addressed using only the underlying symmetries and scales in QCD. Understanding these issues also has a direct impact on other areas of physics, such as on devising clean methods for the measurement of CP violation in the decay of B-mesons. Current progress on the soft-collinear effective theory and related methods is discussed in this report.
- Research Organization:
- Massachusetts Institute of Technology, Cambridge, MA (US)
- Sponsoring Organization:
- USDOE Office of Science (SC) (US)
- DOE Contract Number:
- FG02-03ER41238
- OSTI ID:
- 825001
- Resource Relation:
- Other Information: PBD: 8 Jun 2004
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
B MESONS
DECAY
DISTRIBUTION FUNCTIONS
FIELD THEORIES
FORM FACTORS
HADRONS
PHYSICS
PROBES
QUANTUM CHROMODYNAMICS
SHAPE
STRONG INTERACTIONS
QUANTUM CHROMODYNAMICS (QCD) EFFECTIVE FIELD THEORY FUNDAMENTAL SYMMETRIES