Электронный каталог

Статья

Afzal, F.
First Measurement Using Elliptically Polarized Photons of the Double-Polarization Observable E for *gp*>p*p*0 and *gp*>n*p*+ / F.Afzal, N.Borisov, I.Gorodnov, V.L.Kashevarov, A.Lazarev, A.Neganov, Yu.A.Usov, [a.o.] // Physical Review Letters [Electronic resource]. – 2024. – Vol. 132, No. 12. – P. 121902. – URL: https://doi.org/10.1103/PhysRevLett.132.121902. – Bibliogr.: 51.

We report the measurement of the helicity asymmetry E for the pπ*0 and nπ*+ final states using, for the first time, an elliptically polarized photon beam in combination with a longitudinally polarized target at the Crystal Ball experiment at MAMI. The results agree very well with data that were taken with a circularly polarized photon beam, showing that it is possible to simultaneously measure polarization observables that require linearly (e.g., G) and circularly polarize*+ final state) and the full range of pion polar angles, θ, providing the most precise measurement of the observable E. A moment analysis gives a clear observation of the pη cusp in the pπ*0 final state.



ОИЯИ = ОИЯИ (JINR)2024
Спец.(статьи,препринты) = С 346.4б - Образование пи-мезонов при соударении частиц и гамма-квантов
Бюллетени = 22/024