Partial Wave Amplitudes of the Reaction π-+p→ η +n

Separation of S – wave pseudoscalar and pseudovector amplitudes in π − p ↑ → π + π − n reaction on polarized target

THE N∗(1520) → ∆π AMPLITUDES EXTRACTED FROM THE γp → π+π−p REACTION AND COMPARISON TO QUARK MODELS

The γp → π+π−p reaction, in combination with data from the πN → ππN reaction, allows one to obtain the sand d-wave amplitudes for the N∗(1520) decay into ∆π with absolute sign with respect to the N∗(1520) → Nγ helicity amplitudes. In addition one obtains the novel information on the q dependence of the amplitudes. This dependence fits exactly with the predictions of the non-relativistic constit...

Se p 20 07 Physics of η ′ → π + π − η and η ′ → π + π − π 0 decays

The article describes experimental status of the η ′ → π+π−η and η ′ → π+π−π0 decays. A theoretical framework used for description of the decays mechanism is also reviewed. The possibilities for the measurements with WASA-at-COSY are mentioned.

Partial-Wave Analysis of the ηπ + π − System Produced in the Reaction π − p → ηπ + π − n at 18 GeV/c

A partial-wave analysis of 9082 ηππn events produced in the reaction πp → ηππn at 18.3 GeV/c has been carried out using data from experiment 852 at Brookhaven National Laboratory. The data are dominated by J = 0 partial waves consistent with observation of the η(1295) and the η(1440). The mass and width of the η(1295) were determined to be 1282± 5 MeV and 66± 13 MeV respectively while the η(144...

Odd and even partial waves of ηπ − and η ′ π − in π − p → η ( ′ ) π − p at 191 GeV / c COMPASS

C. Adolph h, R. Akhunzyanov g, M.G. Alexeev aa, G.D. Alexeev g, A. Amoroso aa,ac, V. Andrieux v, V. Anosov g, A. Austregesilo j,q, B. Badełek ae, F. Balestra aa,ac, J. Barth d, G. Bauma, R. Beck c, Y. Bedfer v, A. Berlin b, J. Bernhardm, K. Bicker j,q, E.R. Bielert j, J. Bieling d, R. Birsa y, J. Bisplinghoff c, M. Bodlak s, M. Boer v, P. Bordalo l,1, F. Bradamante x,y, C. Braun h, A. Bressan x...