Eur. Phys. J. A (2007) 31: 597-599
https://doi.org/10.1140/epja/i2006-10207-5

QNP 2006

Strange quarks in the nucleon sea

Results from HAPPEX II

¹ Physics and Astronomy Department, California State University, 90032, Los Angeles, CA, USA
² Jefferson Lab, 23606, Newport News, VA, USA

Received: 25 October 2006
Accepted: 1 November 2006
Published online: 23 February 2007

Abstract

The HAPPEX Collaboration measured parity-violating electron scattering from

⁴He$(e, e)$and

H(e, e) in 2004 and 2005 for Q ²≤0.11GeV^2. Results for the strange-quark contributions to the electromagnetic form factors of the nucleon from the 2004 data will be reviewed. Preliminary results from the 2005 data, which have significantly greater statistical precision, are G _E ^s = 0.004±0.014_stat±0.013_syst for Q ² = 0.0772GeV^2 from the helium data and G _E ^s +0.088G _M ^s = 0.004±0.011_stat±0.005_syst±0.004_FF for Q ² = 0.1089GeV^2 from the hydrogen data.