Naslov
Deep Exclusive Electroproduction of π0 at High Q2 in the Quark Valence Regime

Autori
Dlamini, M. ; Androić, Darko ; et al.

Kolaboracija
Jefferson Lab Hall A Collaboration

Izvornik
Physical review letters (0031-9007) 127 (2021); 152301, 7

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
experimental results, distribution amplitude, electroproduction ; generalized parton distribution, virtual quark, structure function momentum

Sažetak
We report measurements of the exclusive neutral pion electroproduction cross section off protons at large values of xB (0.36, 0.48, and 0.60) and Q2 (3.1 to 8.4 GeV2) obtained from Jefferson Lab Hall A experiment E12-06-014. The corresponding structure functions dσT/dt+εdσL/dt, dσTT/dt, dσLT/dt, and dσLT′/dt are extracted as a function of the proton momentum transfer t-tmin. The results suggest the amplitude for transversely polarized virtual photons continues to dominate the cross section throughout this kinematic range. The data are well described by calculations based on transversity generalized parton distributions coupled to a helicity flip distribution amplitude of the pion, thus providing a unique way to probe the structure of the nucleon.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA