Publications (2)0 Total impact
- [Show abstract] [Hide abstract] ABSTRACT: We present the preliminary value of the measurement of the parity violating asymmetry in the cross section of quasi-elastic scattering of longitudinally polarized electrons on deuteron at backward angles at Q2 = 0.23. The preliminary asymmetry is APVd(Q2 = 0.23) = (-20.77+/-0.84stat+/-1.23syst)˙10-6. From this value a preliminary linear combination of the GMs and the isovector axial form factor ~GA can be extracted ~GAT = 1+0.59˙GMs = -0.53+/-0.37+/-0.02. Combining this preliminary linear combination with that extracted from the measurement of the parity violating asymmetry on proton, already publish, it is possible to disentagle the form factors and thus we can obtain a preliminary experimental determination of the isovector axial form factor ~GAT = 1 = -0.43+/-0.46.
- [Show abstract] [Hide abstract] ABSTRACT: A new measurement of the parity violating asymmetry in elastic electron scattering on hydrogen at backward angles and at a four momentum transfer of Q[superscript 2]=0.22 (GeV/c)[superscript 2] is reported here. The measured asymmetry is A[subscript LR]=(-17.23±0.82stat±0.89syst)×10-6. The standard model prediction assuming no strangeness is A[subscript 0]=(-15.87±1.22)×10[superscript -6]. In combination with previous results from measurements at forward angles, it is possible to disentangle for the first time the strange form factors at this momentum transfer, GE[superscript s]=0.050±0.038±0.019 and GM[superscript s]=-0.14±0.11±0.11.