Spin-parity analysis of pp-bar{yields}2{pi}{sup +}2{pi}{sup -} and pp-bar{yields}2{pi}{sup +}2{pi}{sup -}{pi}{sup 0} from initial S states

Journal Article · Fri May 29 04:00:00 EDT 1998 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.55968· OSTI ID:21199073

Fontana, A ^[1]

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1. Dipartimento di Fisica Nucleare e Teorica, Universita di Pavia, via Bassi 6, 27100 Pavia (Italy)

The results of the spin-parity analysis on the pp-bar annihilation into four and five pions, as measured at very low p-bar momentum ({approx}50 MeV/c) with the OBELIX spectrometer, are presented. The pp-bar{yields}2{pi}{sup +}2{pi}{sup -} annihilation is well described in terms of a decay amplitude containing the {pi}{pi}{sigma} interaction from the pp-bar{yields}3{pi} data, a significant contribution from the {rho}{sup '}(1300-1450)(1{sup --}) with mass lower than 1300 MeV and the well-known mesons f{sub 2}(1270), a{sub 1}(1260), and a{sub 2}(1320). The analysis of the pp-bar{yields}2{pi}{sup +}2{pi}{sup -}{pi}{sup 0} annihilation shows a signal from a 0{sup ++} wave in the region 1200-1500 MeV, confirming the results already obtained for the pn-bar{yields}3{pi}{sup -}2{pi}{sup +} annihilation. However, a description in terms of only this signal in not enough to well describe the data. The presence of many 0{sup ++} signals is investigated and the improvements in the data description under these hypotheses are briefly illustrated.

• OSTI ID: 21199073
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 432; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
A1-1260 MESONS
A2-1320 MESONS
ANTIPROTONS
DECAY AMPLITUDES
F2-1270 MESONS
MEV RANGE
MULTIPARTICLE SPECTROMETERS
PARITY
PARTICLE IDENTIFICATION
PARTICLE PRODUCTION
PIONS MINUS
PIONS NEUTRAL
PIONS PLUS
PROTON-ANTIPROTON INTERACTIONS
RESONANCE PARTICLES
REST MASS
RHO-1450 MESONS
S STATES
SPIN