Measurement of the [ital J]/[psi] and [psi][prime] resonance parameters in [ital [bar p]p] annihilation

Journal Article · Mon Feb 01 04:00:00 EST 1993 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.47.772· OSTI ID:7177827

Armstrong, T A; Bettoni, D; Bharadwaj, V; Biino, C; Borreani, G; Broemmelsiek, D; Buzzo, A; Calabrese, R; Ceccucci, A; Cester, R; Church, M D; Dalpiaz, P; Dalpiaz, P F; Dibenedetto, R; Dimitroyannis, D; Fabbri, M G; Fast, J E; Gianoli, A; Ginsburg, C M; Gollwitzer, K E ; Hahn, A A; Hasan, M A; Hsueh, S Y; Lewis, R A; Luppi, E; Macri, M; Majewska, A; Mandelkern, M A; Marchetto, F; Marinelli, M; Marques, J L; Marsh, W; Martini, M; Masuzawa, M; Menichetti, E; Migliori, A; Mussa, R; Palestini, S; Pallavicini, M; Passaggio, S; Pastrone, N; Patrignani, C; Peoples, J Jr; Pesando, L; Petrucci, F; Pia, M G; Pordes, S; Rapidis, P A; Ray, R E; Reid, J D; Rinaudo, G; Roccuzzo, B; Rosen, J L; Sarmiento, M; Savrie, M; Scalisi, A; Schultz, J; Seth, K K; Smith, A; Smith, G A; Sozzi, M; Tecchio, L; Trokenheim, S; Weber, M F; Werkema, S J; Zhang, Y; Zhao, J L; Zioulas, G; Zito, M ^[1]

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1. Fermi National Accelerator Laboratory, Batavia, Illinoi

We report new measurements for the mass, width, and branching ratios for the [ital J]/[psi] and the [psi][prime]. These charmonium states are formed exclusively in [ital [bar p]p] annihilations at the Fermilab Antiproton Accumulator ring, where stochastically cooled antiprotons are brought into collision with the protons of an in- ternal hydrogen gas jet target. The antiproton energy is precisely controlled and measured allowing an accurate measurement of the resonance parameters. From the shape of the excitation curves we find that the widths of [ital J]/[psi] and [psi][prime] are [Gamma]([ital J]/[psi])=99[plus minus]12[plus minus]6 keV and [Gamma]([psi][prime])=306[plus minus]36[plus minus]16 keV, and that the mass of the [ital J]/[psi] is 3096.87[plus minus]0.03[plus minus]0.03 MeV/[ital c][sup 2]. For the [ital J]/[psi] we obtain [ital B]([ital J]/[psi][r arrow][ital [bar p]p])[ital B]([ital J]/[psi][r arrow][ital e][sup +][ital e[minus]]) =(1.14[sup +0.16][sub [minus]0.12][plus minus]0.10)[times]10[sup [minus]4]; for the [psi][prime] we obtain [ital B]([psi][prime][r arrow][ital [bar p]p])[[ital B]([psi][prime][r arrow][ital e][sup +][ital e[minus]]) +[ital B]([psi][prime][r arrow][ital J]/[psi][ital X])[ital B]([ital J]/[psi][r arrow][ital e][sup +][ital e[minus]])] =(1.17[sub [minus]0.12][sup +0.14][plus minus]0.08)[times]10[sup [minus]5].

• OSTI ID: 7177827
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 47:3; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

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ANNIHILATION
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