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The results of the spin-parity analysis of annihilations at very low momentum (≈ 50 MeV/c) are reported. To describe the data the production of the ϱ, f2, a2 and a1 mesons and the presence of the ππ interaction in S-wave (the σ term) in the final state are necessary. The best fit solution requires also the presence of a ϱ′ state of mass and width M = 1.282 ± 0.037, Γ = 0.236 ± 0.036 GeV/c2 and of a heavy pion π(1300) of mass and width M = 1.275 ± 0.015, Γ = 0.218 ± 0.100 GeV/c2. The measured fraction of the annihilation cross section into 2π+2π− is (7.61 ± 0.35) · 10−2.

Study of the anti-p.p -> 2pi+.2pi- annihilation from S states / A., B., M., B., M., C., A., C., S., D.C., R., D., A., F., D., G., B., G., U., M., I., M., M., P., N., S.C., R., S., S., V., F., V., M., V., A., V., A., Z., M., C., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 414:1-2(1997), pp. 220-228. [10.1016/S0370-2693(97)01189-1]

Study of the anti-p.p -> 2pi+.2pi- annihilation from S states

AGNELLO, MICHELANGELO;IAZZI, Felice;MINETTI, Bruno;
1997

Abstract

The results of the spin-parity analysis of annihilations at very low momentum (≈ 50 MeV/c) are reported. To describe the data the production of the ϱ, f2, a2 and a1 mesons and the presence of the ππ interaction in S-wave (the σ term) in the final state are necessary. The best fit solution requires also the presence of a ϱ′ state of mass and width M = 1.282 ± 0.037, Γ = 0.236 ± 0.036 GeV/c2 and of a heavy pion π(1300) of mass and width M = 1.275 ± 0.015, Γ = 0.218 ± 0.100 GeV/c2. The measured fraction of the annihilation cross section into 2π+2π− is (7.61 ± 0.35) · 10−2.
1997
PHYSICS LETTERS. SECTION B
1.1 Articolo in rivista
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/1845765
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