The spin-parity analysis of the data on the pbar p → 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.

pbar p annihilation into four charged pions at rest and in flight

BARGIOTTI, MARIANNE;BERTIN, ANTONIO;CAPPONI, MARCO;CARBONE, ANGELO;DE CASTRO, STEFANO;FABBRI, LAURA;FACCIOLI, PIETRO;GALLI, DOMENICO;GRIMALDI, FILIPPO;MASSA, IGNAZIO GIACOMO;PICCININI, MAURIZIO;SEMPRINI CESARI, NICOLA;VILLA, MAURO;VITALE, ANTONIO;ZOCCOLI, ANTONIO;
2004

Abstract

The spin-parity analysis of the data on the pbar p → 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.
2004
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; L. FABBRI; P. 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. CICALÒ; 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; F. IAZZI
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/1556
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