Partial wave analysis of pbar-p annihilation channels in flight with I=1, C=+1

TL;DR

This paper conducts a partial wave analysis of antiproton-proton annihilation channels in flight, identifying resonance states with specific quantum numbers and masses, and compares findings with previous data for isospin I=1 and I=0 states.

Contribution

It provides a detailed analysis of resonance spectra in pbar-p annihilation, revealing new states and refining the understanding of meson resonance structures in the 1960-2410 MeV range.

Findings

Identification of multiple resonance states with specific J^PC, masses, and widths.

Two alternative solutions for the resonance spectrum are presented, with experimental data favoring one.

Indications of additional states just below the analyzed mass range.

Abstract

A combined analysis is reported of 3pizero, pizero-eta and pizero-etaprime data in the mass range 1960 to 2410 MeV. This analysis is made consistent also with eta-eta-pizero data, reported separately. The analysis requires s-channel resonances with a spectrum close to that published earlier for C = +1 states with I = 0; masses for I=1 states are lower on average by 20 MeV. Two alternative solutions are found, differing only for J^P = 2^+ and 4^+ states by small amounts in masses and widths. Both 3pizero and eta-pizero data prefer one of these two solutions. For this preferred solution, observed states have J^PC, masses and widths (M,Gamma) in MeV as follows: 4^-+: (2250+-15, 215+-25), 4^++: (2255+-40, 330 ^{+110}_{-50}) and (2005 ^{+25}_{-45}, 180+-30), 3^++: (2275+-35, 350 ^{+100}_{-50}) and (2031+-12, 150 \pm 18), 2^-+: (2245+-60, 320 ^{+100}_{-40}) and (2005+-15, 200+-40, 2^++: (2255+-20, 230+-15), (2175+-40, 310^{+90}_{-45}) and (2030+-20, 205+-30), and 1^++: (2270 ^{+55}_{-40}, 305 ^{+70}_{-35}). There are indications of further 2^-+, 2^++ and 1^++ contributions just below the available mass range, and also a 0^++ state at ~2025 MeV.