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Title: Quark propagation and hadron formation in the nucleus

Abstract

Preliminary results of CLAS Experiment 02-104 at Thomas Jefferson National Accelerator Facility will be presented. The main goal of the experiment was to investigate propagation of quarks through strongly interacting systems. Preliminary results will be presented from a series of measurements comparing hadron production from several nuclei (carbon, iron, and lead) in DIS kinematics to that from deuterium. The attenuation of pions and the broadening of their transverse momentum were measured as a function of $Q^2$, $$\nu$$, $$p_{T}^{2}$$ and $$Z_h$$, with very good statistical precision. Qualitativly new results on the electroproduction 'Cronin effect' will be shown. These measurements are providing a greater understanding of the space-time characteristics of hadronization, and the medium-stimulated emission of gluons by energetic quarks.

Authors:
;
Publication Date:
Research Org.:
Thomas Jefferson Lab National Accelerator Facility
Sponsoring Org.:
USDOE
OSTI Identifier:
955812
Report Number(s):
JLAB-PHY-07-652; DOE/OR/23177-0640
TRN: US1004756
DOE Contract Number:
AC05-060R23177
Resource Type:
Conference
Resource Relation:
Conference: Invited Talk compiled for 2007 APS Meeting
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ATTENUATION; CARBON; CEBAF ACCELERATOR; DEUTERIUM; ELECTROPRODUCTION; GLUONS; HADRONS; IRON; NUCLEI; PIONS; PRODUCTION; QUARKS; SPACE-TIME; TRANSVERSE MOMENTUM

Citation Formats

Hakobyan, Hayk, and Brooks, William. Quark propagation and hadron formation in the nucleus. United States: N. p., 2007. Web.
Hakobyan, Hayk, & Brooks, William. Quark propagation and hadron formation in the nucleus. United States.
Hakobyan, Hayk, and Brooks, William. Sun . "Quark propagation and hadron formation in the nucleus". United States. doi:.
@article{osti_955812,
title = {Quark propagation and hadron formation in the nucleus},
author = {Hakobyan, Hayk and Brooks, William},
abstractNote = {Preliminary results of CLAS Experiment 02-104 at Thomas Jefferson National Accelerator Facility will be presented. The main goal of the experiment was to investigate propagation of quarks through strongly interacting systems. Preliminary results will be presented from a series of measurements comparing hadron production from several nuclei (carbon, iron, and lead) in DIS kinematics to that from deuterium. The attenuation of pions and the broadening of their transverse momentum were measured as a function of $Q^2$, $\nu$, $p_{T}^{2}$ and $Z_h$, with very good statistical precision. Qualitativly new results on the electroproduction 'Cronin effect' will be shown. These measurements are providing a greater understanding of the space-time characteristics of hadronization, and the medium-stimulated emission of gluons by energetic quarks.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Apr 01 00:00:00 EDT 2007},
month = {Sun Apr 01 00:00:00 EDT 2007}
}

Conference:
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  • The preliminary results are presented for Jefferson Lab experiment E02-104 which was performed in the CLAS detector at Thomas Jefferson National Accelerator Facility. During the experiment, data on semi-inclusive production of hadrons in deep-inelastic scattering of a lepton off nuclei were acquired. These data provide important information about the space-time development of in-medium hadronizaton as well as give an opportunity to investigate the fragmentation processes in the nuclear medium. Transverse momentum broadening and hadronic multiplicity ratios for positively charged pions were measured as multidimensional functions of kinematic variables from different nuclear targets.
  • The preliminary results are presented for Jefferson Lab experiment E02-104 which was performed in the CLAS detector at Thomas Jefferson National Accelerator Facility. During the experiment, data on semi-inclusive production of hadrons in deep-inelastic scattering of a lepton off nuclei were acquired. These data provide important information about the space-time development of in-medium hadronizaton as well as give an opportunity to investigate the fragmentation processes in the nuclear medium. Transverse momentum broadening and hadronic multiplicity ratios for positively charged pions were measured as multidimensional functions of kinematic variables from different nuclear targets.
  • Recent inclusive electron-nucleus scattering data have been utilized for precision tests of quark-hadron duality. The data are in the resonance and quasielastic regions and cover a range in Q{sup 2} from 0.5 to 7 (GeV/c){sup 2}. The Q{sup 2} dependence of the moments of the F{sub 2} structure function were investigated and indicate that duality holds for nuclei, even at low Q{sup 2}.
  • The dark tracks (stubs) in high energy neutrino-nucleus interactions in the Tohoku High Resolution Freon Bubble Chamber are investigated. Classifying events into groups by using the dark tracks, correlations between the dark track production and neutrino interactions are studied. Events without dark tracks comprise a reasonable sample of events which occurred on quasi-free nucleons inside nucleus. By comparing the groups using the no dark track group as a comparison sample instead of neutrino-deuterium events, the EMC effect and hadron formation are investigated. This method provides new results which differ somewhat from the conventional data for the EMC effect and formation-rescattering.more » 10 refs., 17 figs.« less
  • Over the past decade, new data from HERMES, Jefferson Lab, Fermilab, and RHIC that connect to parton propagation and hadron formation have become available. Semi-inclusive DIS on nuclei, the Drell-Yan reaction, and heavy-ion collisions all bring different kinds of information on parton propagation within a medium, while the most direct information on hadron formation comes from the DIS data. Over the next decade one can hope to begin to understand these data within a unified picture. I will briefly survey the most relevant data and the common elements of the physics picture, then highlight the new Jefferson Lab data, andmore » close with a prospective for the future.« less