English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The parity-violating asymmetry arising from inelastic electron-nucleonscattering at backward angle (~95 degrees) near the Delta(1232) resonance hasbeen measured using a hydrogen target. From this asymmetry, we extracted theaxial transition form factor G^A_{N\Delta}, a function of the axial Adler formfactors C^A_i. Though G^A_{N\Delta} has been previously studied using chargedcurrent reactions, this is the first measurement of the weak neutral currentexcitation of the Delta using a proton target. For Q^2 = 0.34 (GeV/c)^2 and W =1.18 GeV, the asymmetry was measured to be -33.4 \pm (5.3)_{stat} \pm(5.1)_{sys} ppm. The value of G^A_{N\Delta} determined from the hydrogenasymmetry was -0.05 \pm (0.35)_{stat} \pm (0.34)_{sys} \pm (0.06)_{theory}.These findings agree within errors with theoretical predictions for both thetotal asymmetry and the form factor. In addition to the hydrogen measurement,the asymmetry was measured at the same kinematics using a deuterium target. Theasymmetry for deuterium was determined to be -43.6 \pm (14.6)_{stat} \pm(6.2)_{sys} ppm.

First Measurement of the Neutral Current Excitation of the Delta Resonance on a Proton Target