The Q2-Dependence of the Neutron Spin Structure Function g2n at Low Q2
Creators
- Kevin Kramer
- David Armstrong
- Todd Averett
- William Bertozzi
- Sebastien Binet
- Cornel Butuceanu
- Alexandre Camsonne
- Gordon Cates
- Jian-ping Chen
- Seonho Choi
- Eugene Chudakov
- Francesco Cusanno
- Alexandre Deur
- Pibero Djawotho
- Dipangkar Dutta
- John Finn
- Haiyan Gao
- Franco Garibaldi
- Olivier Gayou
- Ronald Gilman
- Oleksandr Glamazdin
- Viktor Gorbenko
- Keith Griffioen
- Jens-ole Hansen
- Douglas Higinbotham
- Wendy Hinton
- Tanja Horn
- Cornelis De Jager
- Xiaodong Jiang
- Wolfgang Korsch
- John Lerose
- David Lhuillier
- Nilanga Liyanage
- Demetrius Margaziotis
- Kathy Mccormick
- Zein-eddine Meziani
- Robert Michaels
- Brian Milbrath
- Bryan Moffit
- Sirish Nanda
- Charles Perdrisat
- Roman Pomatsalyuk
- Vina Punjabi
- Bodo Reitz
- Julie Roche
- Rikki Roche
- Michael Roedelbronn
- Nikolai Savvinov
- David Secrest
- Jaideep Singh
- Simon Sirca
- Karl Slifer
- Patricia Solvignon
- Daniel Steiner
- Riad Suleiman
- Vincent Sulkosky
- William Tobias
- Antonin Vacheret
- Yuan Xiao
- Xiaochao Zheng
- Jian Ying Zhou
- Lingyan Zhu
- Xiaofeng Zhu
- Piotr Zolnierczuk
- Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Description
We present the first measurement of the Q2-dependence of the neutron spin structure function g2n at five kinematic points covering 0.57 (GeV/c)2 (le) Q2 (le) 1.34 (GeV/c)2 at x ∼ 0.2. Though the naive quark-parton model predicts g2=0, non-zero values for g2 occur in more realistic models of the nucleon which include quark-gluon correlations, finite quark masses or orbital angular momentum. The sensitivity of g2 to physics beyond the simple quark-parton model provides a unique opportunity to examine QCD dynamics in nucleon structure. When scattering occurs from a non-interacting quark, a prediction for g2n can be calculated using next-to-leading order fits to world data for g1n. Our results show a positive deviation from this prediction indicating that contributions such as quark-gluon interactions may be important. Data were also obtained for g1n and are consistent with a next-to-leading order fit to world data evolved to our kinematic range
Availability note (English)
Available from PURL: https://www.osti.gov/servlets/purl/840807-fXwMHz/native/Additional details
Identifiers
Publishing Information
- Imprint Pagination
- 143.5 Kilobytes
- Report number
- JLAB-PHY--05-311
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 36071725
- Subject category
- S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; S71: CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS;
- Resource subtype / Literary indicator
- Non-conventional Literature
- Descriptors DEI
- FORECASTING; NEUTRONS; NUCLEONS; ORBITAL ANGULAR MOMENTUM; PHYSICS; QUANTUM CHROMODYNAMICS; QUARK-GLUON INTERACTIONS; QUARKS; SCATTERING; SENSITIVITY; SPIN; STRUCTURE FUNCTIONS
- Descriptors DEC
- ANGULAR MOMENTUM; BARYONS; ELEMENTARY PARTICLES; FERMIONS; FIELD THEORIES; FUNCTIONS; HADRONS; INTERACTIONS; NUCLEONS; PARTICLE INTERACTIONS; PARTICLE PROPERTIES; QUANTUM FIELD THEORY
Optional Information
- Contract/Grant/Project number
- AC--05-84ER40150
- Funding organization
- USDOE Office of Energy Research ER (United States)
- Secondary number(s)
- DOE/ER--40150-3454; NUCL-EX--0506005