Published March 30, 1992
| Version v1
Journal article
Study of the χ1 and χ2 charmonium states formed in anti pp annihilations
Creators
- Armstrong, T.A.1
- Hasan, M.A.1
- Lewis, R.A.1
- Majewska, A.M.1
- Reid, J.D.1
- Smith, G.A.1
- Zhang, Y.1
- Bettoni, D.2, 3
- Borreani, G.2, 3
- Calabrese, R.2, 3
- Dalpiaz, P.2, 3
- Dalpiaz, P.F.2, 3
- Fabbri, M.2, 3
- Luppi, E.2, 3
- Martini, M.2, 3
- Petrucci, F.2, 3
- Savrie, M.2, 3
- Bharadwaj, V.4
- Church, M.D.4
- Hahn, A.A.4
- Hsueh, S.Y.4
- Marsh, W.4
- Peoples, J. Jr.4
- Pordes, S.4
- Rapidis, P.A.4
- Werkema, S.J.4
- Biino, C.5, 6
- Ceccucci, A.5, 6
- Cester, R.5, 6
- Marchetto, F.5, 6
- Menichetti, E.5, 6
- Migliori, A.5, 6
- Mussa, R.5, 6
- Palestini, S.5, 6
- Pastrone, N.5, 6
- Pesando, L.5, 6
- Rinaudo, G.5, 6
- Tecchio, L.5, 6
- Broemmelsiek, D.R.7
- Fast, J.E.7
- Gee, M.7
- Gollwitzer, K.E.7
- Mandelkern, M.A.7
- Marques, J.L.7
- Schultz, J.7
- Weber, M.F.7
- Zioulas, G.7
- Buzzo, A.8, 9
- Dameri, M.8, 9
- Ferroni, S.8, 9
- Macri, M.8, 9
- Marinelli, M.8, 9
- Patrignani, C.8, 9
- Pia, M.G.8, 9
- Santroni, A.8, 9
- Tommasini, S.8, 9
- Zito, M.8, 9
- Dimitroyannis, D.10
- Ginsburg, C.M.10
- Masuzawa, M.10
- Rosen, J.L.10
- Sarmiento, M.10
- Seth, K.K.10
- Trokenheim, S.10
- Zhao, J.L.10
- Ray, R.E.4, 10
- 1. Pennsylvania State Univ., University Park, PA (United States)
- 2. Univ. Ferrara (Italy)
- 3. INFN, Ferrara (Italy)
- 4. Fermi National Accelerator Lab., Batavia, IL (United States)
- 5. Univ. Turin (Italy)
- 6. INFN, Turin (Italy)
- 7. Univ. of California at Irvine, CA (United States)
- 8. Univ. Genoa (Italy)
- 9. INFN, Genoa (Italy)
- 10. Northwestern Univ., Evanston, IL (United States)
Description
We report on a study of the χ1(3P1) and χ2(3P2) 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 χ1 and 585 χ2 events we find Mχ1=(3510.53±0.13) MeV/c2, Mχ2=(3556.15±0.14) MeV/c2, Γχ1=(0.88±0.14) MeV and Γχ2=(1.98±0.18) MeV. From our measurement of the quantity Γ(R→anti pp)xBR(R→J/ψγ)xBR(J/ψ→e+e-), using known branching ratios, we obtain Γ(χ1→anti pp)=(69±13) eV and Γ(χ2→anti pp)=(180±31) eV. (orig.)
Additional details
Publishing Information
- Journal Title
- Nuclear Physics. B, Particle Physics
- Journal Volume
- 373
- Journal Issue
- 1
- Series
- Nucl. Phys., B Part. Phys.
- Journal Page Range
- 35-54
- ISSN
- 0550-3213
- CODEN
- NUPBB
INIS
- Country of Publication
- Netherlands
- Country of Input or Organization
- Netherlands
- INIS RN
- 23055763
- Subject category
- S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
- Resource subtype / Literary indicator
- Numerical Data
- Descriptors DEI
- ANNIHILATION; BRANCHING RATIO; CHI1-3510 MESONS; CHI2-3555 MESONS; EFFECTIVE MASS; ELECTRONS; ENERGY DEPENDENCE; EXCITATION FUNCTIONS; EXPERIMENTAL DATA; E1-TRANSITIONS; GEV RANGE 01-10; HADRONIC PARTICLE DECAY; INTEGRAL CROSS SECTIONS; J PSI-3097 MESONS; LEPTONIC DECAY; MASS SPECTRA; PAIR PRODUCTION; PARTICLE WIDTHS; PHOTONS; POSITRONS; PROTON-ANTIPROTON INTERACTIONS; RADIATIVE DECAY; REST MASS
- Descriptors DEC
- ANTILEPTONS; ANTIMATTER; ANTIPARTICLES; AXIAL VECTOR MESONS; BARYON-BARYON INTERACTIONS; BASIC INTERACTIONS; BOSONS; CHARMONIUM; CROSS SECTIONS; DATA; DECAY; ELEMENTARY PARTICLES; ENERGY RANGE; ENERGY-LEVEL TRANSITIONS; FERMIONS; GEV RANGE; HADRON-HADRON INTERACTIONS; HADRONS; INFORMATION; INTERACTIONS; LEPTONS; MASS; MASSLESS PARTICLES; MATTER; MESONS; MULTIPOLE TRANSITIONS; NUCLEON-ANTINUCLEON INTERACTIO; NUMERICAL DATA; PARTICLE DECAY; PARTICLE INTERACTIONS; PARTICLE PRODUCTION; PARTICLE PROPERTIES; QUARKONIUM; SPECTRA; TENSOR MESONS; VECTOR MESONS; WEAK INTERACTIONS; WEAK PARTICLE DECAY