Longitudinal-Transverse Separation of Deep-Inelastic Scattering at Low Q² on Nucleons and Nuclei

Thesis/Dissertation · Mon Dec 06 04:00:00 EST 2004

DOI:https://doi.org/10.2172/915446· OSTI ID:915446

Tvaskis, Vladas ^[1]

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1. Vrije Univ., Amsterdam (Netherlands)

Since the early experiments at SLAC, which discovered the nucleon substructure and led to the development of the quark parton model, deep inelastic scattering (DIS) has been the most powerful tool to investigate the partonic substructure of the nucleon. After about 30 years of experiments with electron and muon beams the nucleon structure function F₂(x,Q²) is known with high precision over about four orders of magnitude in x and Q². In the region of Q² > 1 (GeV/c)² the results of the DIS measurements are interpreted in terms of partons (quarks and gluons). The theoretical framework is provided in this case by perturbative Quantum Chromo Dynamics (pQCD), which includes scaling violations, as described by the Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) equations. The description starts to fail when Q² becomes of the order of 1 (GeV/c)², where non-perturbative effects (higher-twist effects), which are still not fully understood, become important (non-pQCD). The sensitivity for order-n twist effects increases with decreasing Q², since they include a factor 1/(Q²ⁿ) (n ≥ 1).

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Energy Research (ER)
• DOE Contract Number: AC05-84ER40150
• OSTI ID: 915446
• Report Number(s): JLAB-PHY--04-328; DOE/ER/40150--5015
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
DEEP INELASTIC SCATTERING
ELECTRONS
GLUONS
MUON BEAMS
NUCLEI
NUCLEONS
QUARKS
SCATTERING
SENSITIVITY
STANFORD LINEAR ACCELERATOR CENTER
STRUCTURE FUNCTIONS