Data di Pubblicazione:
1992
Abstract:
We report on a study of the chi-1(P-3(1)) and chi-2(P-3(2)) states of charmonium formed in antiproton-proton annihilations. An energy scan through the resonances, performed with a very narrow momentum-band beam of antiprotons intersecting a hydrogen jet target, enables us to perform very precise measurements of the mass and the total width of the two resonances. From a sample of 513-chi-1 and 585-chi-2 events, we find M(chi-1) = (3510.53 +/- 0. 13) MeV/c2, M(chi-2) = (3556.15 +/- 0.14) MeV/c2, GAMMA(chi-1) = (0-88 +/- 0.14) MeV and GAMMA(chi-2) = (1.98 +/- 0.18) MeV. From our measurement of the quantity GAMMA(R --> ppBAR) X BR(R --> J/psi-gamma) x BR(J/psi --> e+ e-), using known branching ratios, we obtain GAMMA(chi-1 --> ppBAR) = (69 +/- 13) eV and GAMMA(chi-2 --> ppBAR) = (180 +/- 31) eV.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
ALUMINIZED MYLAR TUBES; P-WAVE QUARKONIUM; CHARGE DIVISION; DECAYS; CHAMBER; SPECTROSCOPY; FERMILAB; BARYONS; SYSTEM; QCD
Elenco autori:
T. A. ARMSTRONG;D. BETTONI;V. BHARADWAJ;C. BIINO;G. BORREANI;D. R. BROEMMELSIEK;A. BUZZO;R. CALABRESE;A. CECCUCCI;R. CESTER;M. D. CHURCH;P. DALPAIZ;P. F. DALPIAZ;M. DAMERI;D. DIMITROYANNIS;M. FABBRI;J. E. FAST;S. FERRONI;M. GEE;C. M. GINSBURG;K. E. GOLLWITZER;A. A. HAHN;M. A. HASAN;S. Y. HSUEH;R. A. LEWIS;E. LUPPI;M. MACRI;A. M. MAJEWSKA;M. A. MANDELKERN;F. MARCHETTO;M. MARINELLI;J. L. MARQUES;W. MARSH;M. MARTINI;M. MASUZAWA;E. MENICHETTI;A. MIGLIORI;R. MUSSA;S. PALESTINI;N. PASTRONE;C. PATRIGNANI;J. PEOPLES;L. PESANDO;F. PETRUCCI;M. G. PIA;S. PORDES;P. A. RAPIDIS;R. E. RAY;J. D. REID;G. RINAUDO;J. L. ROSEN;A. SANTRONI;M. SARMIENTO;M. SAVRIE;J. SCHULTZ;K. K. SETH;G. A. SMITH;L. TECCHIO;S. TOMMASINI;S. TROKENHEIM;M. F. WEBER;S. J. WERKEMA;Y. ZHANG;J. L. ZHAO;G. ZIOULAS;M. ZITO
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