M. Sozzi

Evidence for ηη resonances in antiproton-proton annihilations at 2950 < s < 3620 MeV

Abstract We present the first high-statistics study of the ηη system over the mass range 1000–3000 MeV/c2. The experiment was performed at the Fermilab Antiproton Accumulator, and the data sample consists of six-photon final states produced in antiproton-proton annihilations at s in the range 2950–3620 MeV. We find evidence for three states with masses 1488 ± 10 MeV/c2, 1748 ± 10 MeV/c2 and 2104 ± 20 MeV/c2 respectively.

Precision measurements of antiproton-proton forward elastic scattering parameters in the 3.7 to 6.2 GeV/c region

Abstract Differential cross sections for p p elastic scattering have been measured for very small momentum transfers at six different incident antiproton momenta in the range 3.7 to 6.2 GeV/c by the detection of recoil protons at scattering angles close to 90°. Forward scattering parameters σ T , b , and ϱ have been determined. For the ϱ-parameter, up to an order of magnitude higher level of precision has been achieved compared to that in earlier experiments. It is found that existing dispersion theory predictions are in disagreement with our results for the ϱ-parameter.

Production of the f2 (1520) resonance in antiproton—proton annihilations at s = 2980 and MeV☆

Abstract We present measurements of the 2π0 mass spectrum in proton—antiproton annihilations. The f2 (1520) resonance is strongly produced in the 3π0 channel. Its production along with an η is observed, but strongly suppressed. Other features are seen in the data, including the f2 (1270) and structures at 2000 MeV/c2 and above.

Evidence for ηη resonances in antiproton-proton annihilations at

Abstract We present the first high-statistics study of the ηη system over the mass range 1000–3000 MeV/c2. The experiment was performed at the Fermilab Antiproton Accumulator, and the data sample consists of six-photon final states produced in antiproton-proton annihilations at s in the range 2950–3620 MeV. We find evidence for three states with masses 1488 ± 10 MeV/c2, 1748 ± 10 MeV/c2 and 2104 ± 20 MeV/c2 respectively.

Evidence For Eta-eta Resonances In Antiproton Proton Annihilations At 2950 Less-than-root-s-less-than 3620 Mev

Abstract We present the first high-statistics study of the ηη system over the mass range 1000–3000 MeV/c2. The experiment was performed at the Fermilab Antiproton Accumulator, and the data sample consists of six-photon final states produced in antiproton-proton annihilations at s in the range 2950–3620 MeV. We find evidence for three states with masses 1488 ± 10 MeV/c2, 1748 ± 10 MeV/c2 and 2104 ± 20 MeV/c2 respectively.

EVIDENCE FOR ETA-ETA RESONANCES IN ANTIPROTON PROTON ANNIHILATIONS AT 2950 LESS-THAN-ROOT-S-LESS-THAN 3620 MEV RID C-5223-2009

Abstract We present the first high-statistics study of the ηη system over the mass range 1000–3000 MeV/c2. The experiment was performed at the Fermilab Antiproton Accumulator, and the data sample consists of six-photon final states produced in antiproton-proton annihilations at s in the range 2950–3620 MeV. We find evidence for three states with masses 1488 ± 10 MeV/c2, 1748 ± 10 MeV/c2 and 2104 ± 20 MeV/c2 respectively.

Production of the f2 (1520) resonance in antiproton—proton annihilations at

Abstract We present measurements of the 2π0 mass spectrum in proton—antiproton annihilations. The f2 (1520) resonance is strongly produced in the 3π0 channel. Its production along with an η is observed, but strongly suppressed. Other features are seen in the data, including the f2 (1270) and structures at 2000 MeV/c2 and above.

PRODUCTION OF THE F(2)(1520) RESONANCE IN ANTIPROTON PROTON ANNIHILATIONS AT ROOT-S=2980 AND 3526 MEV RID C-5223-2009

Abstract We present measurements of the 2π0 mass spectrum in proton—antiproton annihilations. The f2 (1520) resonance is strongly produced in the 3π0 channel. Its production along with an η is observed, but strongly suppressed. Other features are seen in the data, including the f2 (1270) and structures at 2000 MeV/c2 and above.

STUDY OF THE ANGULAR-DISTRIBUTION OF THE REACTION (P)OVER-BARP-]CHI-C2-]J/PSI-GAMMA-]E+E-GAMMA RID C-5223-2009

We report on a study of the angular distribution in the reaction [ital [bar p]p][r arrow][chi][sub [ital c]2][r arrow][ital J]/[psi][gamma][r arrow][ital e][sup +][ital e[minus]][gamma]. Using a sample of 1904 events, we find that the contribution of helicity zero in the formation process is [ital B][sub 0][sup 2][lt]0.22 (90% C.L.), and that the normalized quadrupole amplitude in the radiative decay is [ital a][sub 2]=[minus]0.14[plus minus]0.06. The normalized radiative decay octupole amplitude [ital a][sub 3] is found to be consistent with zero.

Study of the angular distribution of the reaction [ital [bar p]p][r arrow][chi][sub [ital c]2][r arrow][ital J]/[psi][gamma][r arrow][ital e][sup +][ital e[minus]][gamma]

We report on a study of the angular distribution in the reaction [ital [bar p]p][r arrow][chi][sub [ital c]2][r arrow][ital J]/[psi][gamma][r arrow][ital e][sup +][ital e[minus]][gamma]. Using a sample of 1904 events, we find that the contribution of helicity zero in the formation process is [ital B][sub 0][sup 2][lt]0.22 (90% C.L.), and that the normalized quadrupole amplitude in the radiative decay is [ital a][sub 2]=[minus]0.14[plus minus]0.06. The normalized radiative decay octupole amplitude [ital a][sub 3] is found to be consistent with zero.