Observation of the peta^{'} Cusp in the New Precise Beam Asymmetry sigma Data for gammappeta.
Afzal F, Wunderlich Y, Anisovich AV, Bayadilov D, Beck R, Becker M, Blanke E, Brinkmann KT, Ciupka S, Crede V, Dieterle M, Dutz H, Elsner D, Friedrich S, Frommberger F, Gridnev A, Gottschall M, Grüner M, Gutz E, Hammann C, Hannappel J, Hartmann J, Hillert W, Hoff J, Hoffmeister P, Honisch C, Jude T, Kalinowsky H, Kalischewski F, Keshelashvili I, Klassen P, Klein F, Klempt E, Koop K, Kroenert P, Krusche B, Lang M, Lopatin I, Mahlberg P, Meißner UG, Messi F, Metag V, Meyer W, Mitlasóczki B, Müller J, Müllers J, Nanova M, Nikonov K, Nikonov V, Novinskiy V, Novotny R, Piontek D, Reicherz G, Richter L, Rönchen D, Rostomyan T, Salisbury B, Sarantsev A, Schaab D, Schmidt C, Schmieden H, Schultes J, Seifen T, Sokhoyan V, Sowa C, Spieker K, Stausberg N, Thiel A, Thoma U, Triffterer T, Urban M, Urff G, van Pee H, Walther D, Wendel C, Wiedner U, Wilson A, Winnebeck A, Witthauer L; CBELSA/TAPS Collaboration.
Afzal F, et al.
Phys Rev Lett. 2020 Oct 9;125(15):152002. doi: 10.1103/PhysRevLett.125.152002.
Phys Rev Lett. 2020.
PMID: 33095637
For the first time, a strong cusp effect in a polarization observable has been observed that is an effect of a branch-point singularity at the peta^{'} threshold [E_{gamma}=1447 MeV (W=1896 MeV)]. The latest BnGa partial wave analysis includes the new beam asymmetry data a …
For the first time, a strong cusp effect in a polarization observable has been observed that is an effect of a branch-point singularity at t …