Observation of a Neutral Charmoniumlike State Z_c(4025)⁰ in e⁺e⁻ → (D*D̅*)⁰ π⁰

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Observation of a Neutral Charmoniumlike State Z_c(4025)⁰ in e⁺e⁻ → (D*D̅*)⁰ π⁰

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Title: Observation of a Neutral Charmoniumlike State Z_c(4025)⁰ in e⁺e⁻ → (D*D̅*)⁰ π⁰
Author(s):
Ablikim, M.;
Achasov, M. N.;
Ai, X. C.;
Albayrak, O.;
Albrecht, M.;
Ambrose, D. J.;
Amoroso, A.;
Lou, Xinchou (UT Dallas);
BESIII Collaboration
Format: Text
Item Type: Article
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Abstract: We report a study of the process e⁺e⁻ → (D*D̅*)⁰ π⁰ using e⁺e⁻ collision data samples with integrated luminosities of 1092 pb⁻¹ at √s̅ = 4.23 GeV and 826 pb⁻¹ at √s̅ = 4.26 GeV collected with the BESIII detector at the BEPCII storage ring. We observe a new neutral structure near the (D*D̅*)⁰ mass threshold in the π⁰ recoil mass spectrum, which we denote as Z_c(4025)⁰. Assuming a Breit-Wigner line shape, its pole mass and pole width are determined to be (4025.5_{-4.7}^{+2.0) ± 3.1) MeV/c² and (23.0 ± 6.0 ± 1.0) MeV, respectively. The Born cross sections of e⁺e⁻→ Z_c(4025)⁰π⁰ → (D*D̅*)⁰ π⁰ are measured to be (61.6 ± 8.2 ± 9.0) pb at √s̅ = 4.23 GeV and (43.4 ± 8.0 ± 5.4) pb at √s̅ = 4.26 GeV. The first uncertainties are statistical and the second are systematic.
ISSN: 0031-9007
Persistent Link: http://hdl.handle.net/10735.1/4869
http://dx.doi.org/10.1103/PhysRevLett.115.112003
Bibliographic Citation: Ablikim, M., M. N. Achasov, X. C. Ai, O. Albayrak, et al. 2015. "Observation of a Neutral Charmoniumlike State Z_c(4025)⁰ in e⁺e⁻ → (D*D̅*)⁰ π⁰." Physical Review Letters 115(18), doi:10.1103/PhysRevLett.115.182002
Terms of Use: ©2015 American Physical Society

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