Study of the [chi][sub c0](1P[sub 0][number sign]^{3) State of Charmonium Formed in [bar p][number sign]p Annihilations}

Journal Article · Fri Oct 01 00:00:00 EDT 1999 · Physical Review Letters

OSTI ID:6033008

Garzoglio, G; Hahn, A; Marsh, W; Peoples, J Jr; Pordes, S; Streets, J; Werkema, S ^[1]; Ambrogiani, M; Baldini, W; Bettoni, D; Calabrese, R; Dalpiaz, P; Luppi, E; Martini, M; Mussa, R; Savrie, M; Stancari, G ^[2]; Buzzo, A; Lo Vetere, M; Macri, M ; Marinelli, M; Pallavicini, M; Patrignani, C; Robutti, E; Santroni, A ^[3]; Gollwitzer, K E; Lasio, G; Mandelkern, M; Schultz, J; Stancari, M; Zioulas, G ^[4]; Fan, X; Jin, S; Kasper, J; Maas, P; Pedlar, T K; Rosen, J; Seth, K K; Tomaradze, A ^[5]; Argiro, S; Bagnasco, S; Borreani, G; Cester, R; Marchetto, F; Menichetti, E

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1. Fermi National Accelerator Laboratory, Batavia, Illinois 60510 (United States)
2. Istituto Nazionale di Fisica Nucleare and University of Ferrara, 44100 Ferrara (Italy)
3. Istituto Nazionale di Fisica Nucleare and University of Genova, 16146 Genova (Italy)
4. University of California at Irvine, Irvine, California 92697 (United States)
5. Northwestern University, Evanston, Illinois 60208 (United States)

The resonance parameters of [chi][sub c0] , the 1P[sub 0]^{3 resonance of charmonium, have been measured at the Fermilab Antiproton Accumulator by means of the reaction [bar p]p[r arrow][chi][sub c0][r arrow][gamma]J/[psi][r arrow][gamma](e[sup +]e[sup [minus]]) . The results are M([chi][sub c0])=3417.4[sup +1.8][sub [minus]1.9][plus minus]0.2 MeV/c[sup 2] , [Gamma]([chi][sub c0])=16.6[sup +5.2][sub [minus]3.7][plus minus]0.1 MeV , and [Gamma]([chi][sub c0][r arrow][bar p] p)[times]B([chi][sub c0] [r arrow]J/[psi][gamma])[times]B(J/[psi][r arrow] e[sup +]e[sup [minus]])=2.89[sup +0.67][sub [minus]0 .53][plus minus]0.14 eV . Using known branching ratios we also obtain [Gamma]([chi][sub c0][r arrow][bar p] p)=8.0[sup +1.9+3.5][sub [minus]1.5[minus]1.9 ] keV . These results are discussed in relation to the other [chi][sub cJ] states and to theoretical predictions. [copyright] [ital 1999] [ital The American Physical Society ]}

• OSTI ID: 6033008
• Journal Information: Physical Review Letters, Vol. 83:15; ISSN 0031-9007
• Country of Publication: United States
• Language: English

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