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Title: Preliminary Results on the Experimental Investigation of the Structure Functions of Bound Nucleons

Abstract

We present preliminary results on an experimental study of the nuclear modification of the longitudinal ($$\sigma_L$$) and transverse ($$\sigma_T$$) structure functions of nucleons bound in nuclear targets. The origin of these modifications (commonly referred as as the EMC effect) is not fully understood. Our measurements of R= $$\sigma_L / \sigma_T$$ for nuclei ($$R_A$$) and for deuterium ($$R_D$$) indicate that nuclear modifications of the structure functions of bound nucleons are different for the longitudinal and transverse structure functions, and that contrary to expectation from several theoretical models, $$R_A< R_D$$.

Authors:
 [1]
  1. Univ. of Rochester, NY (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:
1332088
Report Number(s):
JLAB-PHY-15-2161; DOE/OR/23177-3992; arXiv:1507.04967
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

Bodek, Arie. Preliminary Results on the Experimental Investigation of the Structure Functions of Bound Nucleons. United States: N. p., 2016. Web.
Bodek, Arie. Preliminary Results on the Experimental Investigation of the Structure Functions of Bound Nucleons. United States.
Bodek, Arie. 2016. "Preliminary Results on the Experimental Investigation of the Structure Functions of Bound Nucleons". United States. doi:. https://www.osti.gov/servlets/purl/1332088.
@article{osti_1332088,
title = {Preliminary Results on the Experimental Investigation of the Structure Functions of Bound Nucleons},
author = {Bodek, Arie},
abstractNote = {We present preliminary results on an experimental study of the nuclear modification of the longitudinal ($\sigma_L$) and transverse ($\sigma_T$) structure functions of nucleons bound in nuclear targets. The origin of these modifications (commonly referred as as the EMC effect) is not fully understood. Our measurements of R= $\sigma_L / \sigma_T$ for nuclei ($R_A$) and for deuterium ($R_D$) indicate that nuclear modifications of the structure functions of bound nucleons are different for the longitudinal and transverse structure functions, and that contrary to expectation from several theoretical models, $R_A< R_D$.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2016,
month = 8
}

Conference:
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  • We present preliminary results on an experimental study of the nuclear modification of the longitudinal (σ L) and transverse (σ T) structure functions of nucleons bound in nuclear targets. The origin of these modifications (commonly referred as as the EMC effect) is not fully understood. Our measurements of R= σ LT for nuclei (R A) and for deuterium (RD) indicate that nuclear modifications of the structure functions of bound nucleons are different for the longitudinal and transverse structure functions, and that contrary to expectation from several theoretical models, R A < R D.
  • From conference on nuclear and hypernuclear physics with kaon beams; Upton, New York (2 Jul 1973). In proceedings of the summer study meeting on nuclear and hypernuclear physics with haon beams. Preliminary results for K- reactions with carbon-12 and oxygen-16 yielding LAMBDA /sup C12/ and LAMBDA / sup O16/ at 390 MeV/c are given. Differential cross sections for the production of the ground and 10-MeV excited states of LAMBDA /sup C12/ and levels of LAMBDA /sub O16/ are found. (JFP)
  • No abstract prepared.
  • A summary is given of experimental results on spin structure functions of the proton g{sub 1}{sup p}(x,Q{sup 2}), deuteron g{sub 1}{sup d}(x,Q{sup 2}), and neutron g{sub 1}{sup n}(x,Q{sup 2}) as measured in deep inelastic scattering of polarized leptons from a polarized target. All results are consistent with the Bjorken sum rule predictions at the Q{sup 2} of each experiment. The data do not support the Ellis-Jaffe sum rule prediction for the proton which implies that the hencity carried by the strange quark may be nonzero and that the net quark helicity is smaller than expected from simple quark models.
  • Polarization transfer in quasi-elastic nucleon knockout is sensitive to the properties of the nucleon in the nuclear medium, including possible modification of the nucleon form factor and/or spinor. Recent measurements at both Mainz and Jefferson Lab of the proton recoil polarization in the {sup 4}He({rvec e},e'{rvec p}){sup 3}H reaction up to Q{sup 2} = 2.6 (GeV/c){sup 2} are presented. The measured ratio of polarization-transfer coefficients differs from a fully relativistic calculation, favoring the inclusion of a medium modification of the proton form factors predicted by a quark-meson coupling model. In addition, the measured induced polarizations agree reasonably well with themore » fully relativistic calculation, indicating that the treatment of final-state interactions is under control. A recently approved follow-up experiment at a Q{sup 2} of 0.8 (GeV/c){sup 2} and 1.3 (GeV/c){sup 2} with unprecedented precision will provide one of the most stringent tests of the applicability of these calculations.« less