The study of the K±Kmiss0π∓π+π− channel (7016 events), from p-pbar annihilations in a gaseous hydrogen target at NTP, with the OBELIX spectrometer at LEAR (CERN), is presented. A spin-parity analysis provides evidence for two axial vectors, one in the low K-Kbar-pi mass region, the well established f1(1285), decaying to a0(980)π, the second, the 1++ component of the old puzzling E/iota, the f1(1420), decaying mainly to K*-Kbar, seen for the first time in pbar-p annihilation at rest. The analysis confirms the dominant production of the pseudoscalar η(1405), decaying mainly to (K-pi)S-Kbar, and the existence of a second pseudoscalar in the same mass region, the η(1460), decaying mainly to K*-Kbar.

A search for axial vectors in anti-p p --> K+- K0(miss) pi+- pi+ pi- annihilations at rest in gaseous hydrogen at NTP

BALESTRA, Ferruccio;BOTTA, Elena;BRESSANI, Tullio;BUSSA, Maria Pia;BUSSO, Luigi;COSTA, Sergio;FERRERO, Livio;GARFAGNINI, Raffaello;GRASSO, Antonino;MARCELLO, Simonetta;
1997

Abstract

The study of the K±Kmiss0π∓π+π− channel (7016 events), from p-pbar annihilations in a gaseous hydrogen target at NTP, with the OBELIX spectrometer at LEAR (CERN), is presented. A spin-parity analysis provides evidence for two axial vectors, one in the low K-Kbar-pi mass region, the well established f1(1285), decaying to a0(980)π, the second, the 1++ component of the old puzzling E/iota, the f1(1420), decaying mainly to K*-Kbar, seen for the first time in pbar-p annihilation at rest. The analysis confirms the dominant production of the pseudoscalar η(1405), decaying mainly to (K-pi)S-Kbar, and the existence of a second pseudoscalar in the same mass region, the η(1460), decaying mainly to K*-Kbar.
400
226
238
antiproton; meson spectroscopy; axial vectors
A. Bertin; M. Bruschi; M. Capponi; A. Collamati; S. De Castro; R. Donà; A. Ferretti; D. Galli; B. Giacobbe; U. Marconi; M. Piccinini; N. Semprini-Cesari; R. Spighi; S. Vecchi; A. Vezzani; F. Vigotti; M. Villa; A. Vitale; A. Zoccoli; M. Corradini; A. Donzella; E. Lodi Rizzini; L. Venturelli; A. Zenoni; C. Cicaló; A. Lai; A. Masoni; L. Musa; G. Puddu; S. Serci; P.P. Temnikov; G. Usai; O.E. Gorchakov; S.N. Prakhov; A.M. Rozhdestvensky; M.G. Sapozhnikov; V.I. Tretyak; M. Poli; P. Gianotti; C. Guaraldo; A. Lanaro; V. Lucherini; F. Nichitiu; C. Petrascu; A. Rosca; V. Ableev; C. Cavion; U. Gastaldi; M. Lombardi; G. Maron; L. Vannucci; G. Vedovato; G. Bendiscioli; V. Filippini; A. Fontana; P. Montagna; A. Rotondi; A. Saino; P. Salvini; C. Scoglio; F. Balestra; E. Botta; T. Bressani; M.P. Bussa; L. Busso; D. Calvo; P. Cerello; S. Costa; O. Denisov; L. Fava; A. Feliciello; L. Ferrero; A. Filippi; R. Garfagnini; A. Grasso; A. Maggiora; S. Marcello; D. Panzieri; D. Parena; E. Rossetto; F. Tosello; L. Valacca; M. Agnello; F. Iazzi; B. Minetti; G. Pauli; S. Tessaro; L. Santi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/113997
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