Probing nucleon strangeness with neutrinos: Nuclear model dependences

被引:47
作者
Barbaro, MB
dePace, A
Donnelly, TW
Molinari, A
Musolf, MJ
机构
[1] IST NAZL FIS NUCL, SEZ TORINO, I-10125 TURIN, ITALY
[2] MIT, CTR THEORET PHYS, NUCL SCI LAB, CAMBRIDGE, MA 02139 USA
[3] MIT, DEPT PHYS, CAMBRIDGE, MA 02139 USA
[4] CONTINUOUS ELECTRON BEAM ACCELERATOR FACIL THEORY, NEWPORT NEWS, VA 23606 USA
[5] UNIV WASHINGTON, INST NUCL THEORY, SEATTLE, WA 98195 USA
来源
PHYSICAL REVIEW C | 1996年 / 54卷 / 04期
关键词
D O I
10.1103/PhysRevC.54.1954
中图分类号
O57 [原子核物理学、高能物理学];
学科分类号
070202 ;
摘要
The extraction of the nucleon's strangeness axial charge Delta s from inclusive, quasielastic neutral current neutrino cross sections is studied within the framework of the plane-wave impulse approximation. We find that the value of Delta s can depend significantly on the choice of nuclear model used in analyzing the quasielastic cross section. This model dependence may be reduced by one order of magnitude when Delta s is extracted from the ratio of total proton to neutron yields. We apply this analysis to the interpretation of low-energy neutrino cross sections and arrive at a nuclear theory uncertainty of +/- 0.03 on the value of Delta s expected to be determined from the ratio of proton and neutron yields measured by the LSND Collaboration. This error compares favorably with estimates of the SU(3)-breaking uncertainty in the value of Delta s extracted from inclusive, polarized deep-inelastic structure function measurements. We also point out several general features of the quasielastic neutral current neutrino cross section and compare them with the analogous features in inclusive, quasielastic electron scattering.
引用
收藏
页码:1954 / 1969
页数:16
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