Электронный каталог

Статья

Mornacchi, E.
Evaluation of the E2/M1 Ratio in the N*>*D(1232) Transition from the *g^-p^- *> p*p*0 Reaction / E.Mornacchi, N.Borisov, A.S.Dolzhikov, I.Gorodnov, A.Lazarev, A.Neganov, Yu.A.Usov, [a.o.] // Physical Review C [Electronic resource]. – 2024. – Vol. 109, No. 5. – P. 055201. – URL: https://doi.org/10.1103/PhysRevC.109.055201. – Bibliogr.: 59.

A new data set for the helicity-dependent differential cross section of the single-meson photoproduction reaction γp→pπ*0 was obtained for the photon energy interval 150–400 MeV. The experiment was performed at the A2 tagged photon facility of the Mainz Microtron MAMI using a circularly polarized photon beam and a longitudinally polarized proton target. The reaction products were detected with the large-acceptance Crystal Ball and TAPS calorimeters covering 97% of the full solid angle. These new results, obtained with a fine energy and polar angle binning, greatly increase both the existing quantity and quality of the data available for this observable. A moment analysis, based on a finite expansion in Legendre polynomials, was applied to these data by using a bootstrap-based fitting method to correctly account for their systematic uncertainties. From the resulting decomposition of the differential cross sections, the E2/M1 ratio for the N→Δ(1232) transition was determined to be [−2.38±0.16(stat.+sys.)±0.10(model)]%. Combining this value with previous results also allowed us to evaluate the most precise available estimate of the E2/M1 ratio to be used for all further reference and model comparisons.



ОИЯИ = ОИЯИ (JINR)2024
Спец.(статьи,препринты) = С 346.6б - Резонансы с участием К-мезонов
Спец.(статьи,препринты) = С 324.1д - Квантовая хромодинамика$
Бюллетени = 28/024