Publicação
Observation of a New Narrow Axial-Vector Meson $a_1$(1420)
| dc.contributor.author | COMPASS collaboration (205 authors) | |
| dc.contributor.author | Bordalo, P. | |
| dc.contributor.author | Franco, C. | |
| dc.contributor.author | Nunes, A.S. | |
| dc.contributor.author | Quaresma, M. | |
| dc.contributor.author | Quintans, C. | |
| dc.contributor.author | Ramos, S. | |
| dc.contributor.author | Silva, L. | |
| dc.contributor.author | Stolarski, M. | |
| dc.date.accessioned | 2019-02-04T05:51:41Z | |
| dc.date.available | 2019-02-04T05:51:41Z | |
| dc.date.issued | 2015-08-19 | |
| dc.date.updated | 2019-02-04T05:51:41Z | |
| dc.description.abstract | The COMPASS Collaboration at CERN has measured diffractive dissociation of 190 GeV/c pions into the π-π-π+ final state using a stationary hydrogen target. A partial-wave analysis (PWA) was performed in bins of 3π mass and four-momentum transfer using the isobar model and the so far largest PWA model consisting of 88 waves. A narrow peak is observed in the f0(980)π channel with spin, parity and C-parity quantum numbers JPC=1++. We present a resonance-model study of a subset of the spin-density matrix selecting 3π states with JPC=2++ and 4++ decaying into ρ(770)π and with JPC=1++ decaying into f0(980)π. We identify a new a1 meson with mass (1414-13+15) MeV/c2 and width (153-23+8) MeV/c2. Within the final states investigated in our analysis, we observe the new a1(1420) decaying only into f0(980)π, suggesting its exotic nature. | |
| dc.description.version | Peer Reviewed | |
| dc.identifier | Phys.Rev.Lett. 115 (2015) 082001; DOI 10.1103/PhysRevLett.115.082001 | |
| dc.identifier.uri | http://dx.doi.org/10.1103/PhysRevLett.115.082001 | |
| dc.identifier.uri | http://hdl.handle.net/10400.26/26762 | |
| dc.language.iso | eng | |
| dc.title | Observation of a New Narrow Axial-Vector Meson $a_1$(1420) | |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| rcaap.rights | openAccess | pt |
| rcaap.type | article |