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Study of the reaction e+e−→ψ(2S)π+π− via initial-state radiation at BaBar
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BaBar Collaboration (Including: Gershon, T. J., Harrison, P. F., Latham, T. E. and Puccio, E. M. T.). (2014) Study of the reaction e+e−→ψ(2S)π+π− via initial-state radiation at BaBar. Physical Review D (Particles, Fields, Gravitation and Cosmology), Volume 89 . Article number 111103(R). ISSN 1550-7998.
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Official URL: http://dx.doi.org/10.1103/PhysRevD.89.111103
Abstract
We study the process e+e−→ψ(2S)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 at and near the Υ(nS) (n=2,3,4) resonances and correspond to an integrated luminosity of 520 fb−1. We investigate the ψ(2S)π+π− mass distribution from 3.95 to 5.95 GeV/c2, and measure the center-of-mass energy dependence of the associated e+e−→ψ(2S)π+π− cross section. The mass distribution exhibits evidence of two resonant structures. A fit to the ψ(2S)π+π− mass distribution corresponding to the decay mode ψ(2S)→J/ψπ+π− yields a mass value of 4340±16 (stat) ±9 (syst) MeV/c2 and a width of 94±32 (stat) ±13 (syst) MeV for the first resonance, and for the second a mass value of 4669±21 (stat) ±3 (syst) MeV/c2 and a width of 104±48 (stat) ±10 (syst) MeV. In addition, we show the π+π− mass distributions for these resonant regions.
Item Type: | Journal Article | ||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
Journal or Publication Title: | Physical Review D (Particles, Fields, Gravitation and Cosmology) | ||||||
Publisher: | American Physical Society | ||||||
ISSN: | 1550-7998 | ||||||
Official Date: | 25 June 2014 | ||||||
Dates: |
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Volume: | Volume 89 | ||||||
Article Number: | Article number 111103(R) | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published |
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