Anti-pp annihilation into four charged pions at rest and in flight

P Salvini,V I Tretyak,V Filippini,A Fontana,P Montagna,A Panzarasa,A Rotondi,M Bargiotti,A Bertin, M Bruschi,M Capponi,A Carbone,S De Castro,Laura Fabbri,Pietro Faccioli,D Galli,B Giacobbe,F Grimaldi,U Marconi, I Massa, M Piccinini,N Semprini Cesari, R Spighi, S Vecchi,M Villa,A Vitale, A Zoccoli,A Bianconi,M Corradini,A Donzella,E Lodi Rizzini,L Venturelli,A Zenoni,C Cicalo,A De Falco, A Masoni,G Puddu,S Serci,G Usai,O E Gorchakov,S N Prakhov,A M Rozhdestvensky,M G Sapozhnikov, M Poli,P Gianotti,C Guaraldo, A Lanaro,V Lucherini,C Petrascu,D Panzieri,F Balestra, M P Bussa,L Busso,P Cerello,O Denisov,L Ferrero,A Grasso,A Maggiora,F Tosello,E Botta,T Bressani,D Calvo,F De Mori,A Feliciello,A Filippi,S Marcello,M Agnello,Felice Iazzi

European Physical Journal C（2004）

引用 28|浏览34

暂无评分

摘要

The spin-parity analysis of the data on the ¯pp → 2π+ 2π − annihilation reaction at rest in liquid and in gaseous hydrogen at 3 bar pressure and in flight at p momentum of 50 MeV/c, collected by the Obelix spectrometer at the LEAR complex of CERN, is presented. The relative branching ratios (a1(1260) → σπ)/(a1(1260) → ρπ) = 0.06 ± 0.05 and (π(1300) → σπ)/(π(1300) → ρπ) = 2.2 ± 0.4 are obtained. It is also shown that the inclusion of the exotic meson π1(1400), JPC= 1−+, mass and width M = 1.384 ± 0.028, Γ = 0.378 ± 0.058 GeV/c2, in its decay to ρπ, improves the fit and some implications of these results are briefly discussed. The relative S and P-wave annihilation percentages in four charged pions at two target densities are obtained

查看译文

AI 理解论文

溯源树

样例

生成溯源树，研究论文发展脉络

Chat Paper

正在生成论文摘要