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Title: Quark-Hadron Duality in Mesons Electroproduction

Abstract

The aim of the current work is to study quark-hadron duality in meson electroproduction. While duality between inclusive electron-hadron scattering in the resonance and deep inelastic regimes (Bloom-Gilman or quark-baryon duality) is well established, the existence of a similar duality in meson electroproduction has not yet been tested. In the inclusive case, duality implies that singlequark scattering governs the scale of the reaction: the nucleon resonances act at low Q 2 as one would expect from a scaling behavior. In the semi-inclusive case, the nucleon resonances may similarly affect a scaling behavior in the nal meson channel. On the other hand, it could be that (for example) the Δ resonance does not fall anomalously fast in semi-inclusive scattering, which would provide us with important clues about that phenomenon. New evidence for factorization of the cross section at low energy loss into two pieces - quark scattering and quark fragmentation - guides our approach to this measurement. This work addresses two issues, which are possibly related. Firstly, does the cross section still factorize at low energy loss, and can one reproduce the fragmentation functions determined from high energy scattering? Secondly, do the nucleon resonances average around these high energy fragmentation functions?

Authors:
 [1]
  1. Yerevan Physics Inst. (YerPhI) (Armenia)
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
955810
Report Number(s):
JLAB-PHY-07-936; DOE/OR/23177-0602
TRN: US1004754
DOE Contract Number:
AC05-060R23177
Resource Type:
Thesis/Dissertation
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; DUALITY; ELECTROPRODUCTION; MESONS; QUARK-HADRON INTERACTIONS

Citation Formats

Navasardyan, Tigran. Quark-Hadron Duality in Mesons Electroproduction. United States: N. p., 2007. Web. doi:10.2172/955810.
Navasardyan, Tigran. Quark-Hadron Duality in Mesons Electroproduction. United States. doi:10.2172/955810.
Navasardyan, Tigran. Mon . "Quark-Hadron Duality in Mesons Electroproduction". United States. doi:10.2172/955810. https://www.osti.gov/servlets/purl/955810.
@article{osti_955810,
title = {Quark-Hadron Duality in Mesons Electroproduction},
author = {Navasardyan, Tigran},
abstractNote = {The aim of the current work is to study quark-hadron duality in meson electroproduction. While duality between inclusive electron-hadron scattering in the resonance and deep inelastic regimes (Bloom-Gilman or quark-baryon duality) is well established, the existence of a similar duality in meson electroproduction has not yet been tested. In the inclusive case, duality implies that singlequark scattering governs the scale of the reaction: the nucleon resonances act at low Q2 as one would expect from a scaling behavior. In the semi-inclusive case, the nucleon resonances may similarly affect a scaling behavior in the nal meson channel. On the other hand, it could be that (for example) the Δ resonance does not fall anomalously fast in semi-inclusive scattering, which would provide us with important clues about that phenomenon. New evidence for factorization of the cross section at low energy loss into two pieces - quark scattering and quark fragmentation - guides our approach to this measurement. This work addresses two issues, which are possibly related. Firstly, does the cross section still factorize at low energy loss, and can one reproduce the fragmentation functions determined from high energy scattering? Secondly, do the nucleon resonances average around these high energy fragmentation functions?},
doi = {10.2172/955810},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}

Thesis/Dissertation:
Other availability
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  • One of the biggest challenges in the study of the nucleon structure is the understanding of the transition from partonic degrees of freedom to hadronic degrees of freedom. In 1970, Bloom and Gilman noticed that structure function data taken at SLAC in the resonance region average to the scaling curve of deep inelastic scattering (DIS). Early theoretical interpretations suggested that these two very different regimes can be linked under the condition that the quark-gluon and quark-quark interactions are suppressed. Substantial efforts are ongoing to investigate this phenomenon both experimentally and theoretically. Quark-hadron duality has been confirmed for the unpolarized structuremore » function F 2 of the proton and the deuteron using data from the experimental Hall C at Jefferson Lab (JLab). Indications of duality have been seen for the proton polarized structure function g 1 and the virtual photon asymmetry A 1 at JLab Hall B and HERMES. Because of the different resonance behavior, it is expected that the onset of duality for the neutron will happen at lower momentum transfer than for the proton. Now that precise spin structure data in the DIS region are available at large x, data in the resonance region are greatly needed in order to test duality in spin-dependent structure functions. The goal of experiment E01-012 was to provide such data on the neutron ( 3He) in the moderate momentum transfer (Q 2) region, 1.0 < Q 2 < 4.0 (GeV/c 2), where duality is expected to hold. The experiment ran successfully in early 2003 at Jefferson Lab in Hall B. It was an inclusive measurement of longitudinally polarized electrons scattering from a longitudinally or transversely polarized 3He target. Asymmetries and cross section differences were measured in order to extract the 3He spin structure function g 1 and virtual photon asymmetry A 1 in the resonance region. A test of quark-hadron duality has then been performed for the 3He and neutron structure functions. The study of spin duality for the neutron will provide a better understanding of the mechanism of the strong interaction. Moreover, if duality is well understood, our resonance data will bring information on the high x region where theoretical predictions for A 1 are drastically different.« less
  • Inclusive electron-proton and electron-deuteron inelastic cross sections have been measured at Jefferson Lab, in the resonance region, at large Bjorken X. These measurements extended previous Hall C measurements to a larger four-momentum transfer (up to 7.5 GeV 2) and larger x (up to 0.92). These measurments were used for quark-hadron duality studies, construction of Cornwall-Norton moments and extraction of higher-twists.
  • The kaon electroproduction cross section was extracted from data from the E93-018 and the E01-004 (FPI-2) experiments taken at the Thomas Jefferson National Accelerator Facility in the p(e,e'K +)Λ channel. The cross section was fully separated into longitudinal, transverse, and two interference components at four-momentum transfers Q 2 of 1.0 (GeV/c) 2 (with center of mass energy W=1.81 GeV), 1.36 and 2.07 (GeV/c) 2 (W=2.31 GeV). The kaon form factor (FK) was extracted from the longitudinal cross section in these kinematics using the Regge model by Vanderhaeghen, Guidal, and Laget. Results show F K to be systematically lower than themore » empirical monopole form, although still compatible with this form within the estimated uncertainties. The resulting kaon form factor values were combined with the world pion and kaon form factor data to extract the transverse change densities of the pion and kaon. These were compared to that of the proton, showing a possible experimental glimpse of the transition between the proton core and the meson cloud in terms of transverse densities.« less