Título:
|
Study of the reaction e+e− → J/ψπ+π− via initial-state radiation at BABAR
|
Autor/a:
|
Garra Ticó, Jordi; Graugés Pous, Eugeni; BABAR Collaboration
|
Otros autores:
|
Universitat de Barcelona |
Abstract:
|
We study the process e + e − → J / ψ π + π − with initial-state-radiation events produced at the PEP-II asymmetric-energy collider. The data were recorded with the BABAR detector at center-of-mass energies 10.58 and 10.54 GeV, and correspond to an integrated luminosity of 454 fb − 1 . We investigate the J / ψ π + π − mass distribution in the region from 3.5 to 5.5 GeV / c 2 . Below 3.7 GeV / c 2 the ψ ( 2 S ) signal dominates, and above 4 GeV / c 2 there is a significant peak due to the Y ( 4260 ) . A fit to the data in the range 3.74 - 5.50 GeV / c 2 yields a mass value 4245 ± 5 ( stat ) ± 4 ( syst ) MeV / c 2 and a width value 114 + 16 − 15 ( stat ) ± 7 ( syst ) MeV for this state. We do not confirm the report from the Belle Collaboration of a broad structure at 4.01 GeV / c 2 . In addition, we investigate the π + π − system which results from Y ( 4260 ) decay. |
Materia(s):
|
-Física de partícules -Experiments -Massa (Física) -Energia -Particle physics -Experiments -Mass (Physics) -Energy |
Derechos:
|
(c) American Physical Society, 2012
|
Tipo de documento:
|
Artículo Artículo - Versión publicada |
Editor:
|
American Physical Society
|
Compartir:
|
|