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Title: Quark Hadron Duality - Recent Jefferson Lab Results

Abstract

The duality between the partonic and hadronic descriptions of electron--nucleon scattering is a remarkable feature of nuclear interactions. When averaged over appropriate energy intervals the cross section at low energy which is dominated by nucleon resonances resembles the smooth behavior expected from perturbative QCD. Recent Jefferson Lab results indicate that quark-hadron duality is present in a variety of observables, not just the proton F2 structure function. An overview of recent results, especially local quark-hadron duality on the neutron, are presented here.

Authors:
 [1]
  1. James Madison Univ., Harrisonburg, VA (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1332097
Report Number(s):
JLAB-PHY-15-2163; DOE/OR/23177-3994; arXiv:1509.07795
DOE Contract Number:
AC05-06OR23177
Resource Type:
Conference
Resource Relation:
Conference: CIPANP 2015, Vail, CO, May 19-24, 2015
Country of Publication:
United States
Language:
English

Citation Formats

Niculescu, Maria Ioana. Quark Hadron Duality - Recent Jefferson Lab Results. United States: N. p., 2016. Web.
Niculescu, Maria Ioana. Quark Hadron Duality - Recent Jefferson Lab Results. United States.
Niculescu, Maria Ioana. 2016. "Quark Hadron Duality - Recent Jefferson Lab Results". United States. doi:. https://www.osti.gov/servlets/purl/1332097.
@article{osti_1332097,
title = {Quark Hadron Duality - Recent Jefferson Lab Results},
author = {Niculescu, Maria Ioana},
abstractNote = {The duality between the partonic and hadronic descriptions of electron--nucleon scattering is a remarkable feature of nuclear interactions. When averaged over appropriate energy intervals the cross section at low energy which is dominated by nucleon resonances resembles the smooth behavior expected from perturbative QCD. Recent Jefferson Lab results indicate that quark-hadron duality is present in a variety of observables, not just the proton F2 structure function. An overview of recent results, especially local quark-hadron duality on the neutron, are presented here.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2016,
month = 8
}

Conference:
Other availability
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  • New measurements of inclusive electron scattering on the proton and deuteron have been made at Jefferson Lab with a four-momentum transfer range of 0.3 lte Q{sup 2} lte 4.5 (GeV/c){sup 2} as a study of quark-hadron duality at low Q{sup 2}. The F{sub 2} structure function is found to scale about a common scaling curve down to Q{sup 2} of 0.5 (GeV/c){sup 2}, indicating that higher twist effects are small. Duality in other observables and in electron scattering on nuclei are also discussed.
  • At high enough energies asymptotic freedom guarantees the deep inelastic scattering cross sections to be calculated as nearly free electron-quark scattering. However, confinement guarantees that the experimentally observed final states particles are hadrons. Low-energy quark hadron duality suggests that the hadronic cross sections, when averaged over an appropriate energy range, nevertheless coincide with the naive leading-twist quark-gluon calculations. Deep inelastic inclusive scattering shows that scaling at modest Q{sup 2} and v already arises from very few resonance channels. This is reflected by the striking agreement (<10%) between data in the nucleon resonance region and the deep inelastic (W{sup 2}>4GeV{sup 2})more » region for the Q{sup 2}>0.5 (GeV/c){sup 2}, known as the Bloom-Gilman duality. Electron-hadron scattering allows for further investigation of quark-hadron duality by virtue of its ability to select resonances, by tagging with either spin or flavor.« less
  • No abstract prepared.
  • The Bloom-Gilman duality has been experimentally demonstrated for spin independent structure functions. Duality is observed when the smooth scaling curve at high momentum transfer is an average over the resonance bumps at lower momentum transfer, but at the same value of scaling variable x. Signs of quark-hadron duality for the spin Dependant structure function g1 of the proton has been recently reported by the Hermes collaboration. Experimental Halls A, B and C at Jefferson lab have recently measured spin structure functions in the resonance region for the proton and the neutron. Data from these experiments combined with Deep-Inelastic-Scattering data providemore » a precision test of quark-hadron duality predictions for spin structure functions for both the proton and the neutron. This will be one of the first precision tests of spin and flavor dependence of quark-hadron duality.« less
  • Explicit quark-hadron duality in the limit of heavy quark mass is studied using the 't Hooft model, where both partonic and hadronic amplitudes may be computed exactly. Results for weak decays of heavy mesons are presented for both standard spectator decays, where the duality limit is convincingly approached, and annihilation decays of the valence quark-antiquark pair, where the approach to asymptotic duality is much less precise.