Observation of a Neutral Structure Near the DD̅* Mass Threshold in e⁺e⁻ → (DD̅*)⁰π⁰ at √s̅ = 4.226 and 4.257 GeV

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Observation of a Neutral Structure Near the DD̅* Mass Threshold in e⁺e⁻ → (DD̅*)⁰π⁰ at √s̅ = 4.226 and 4.257 GeV

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Title: Observation of a Neutral Structure Near the DD̅* Mass Threshold in e⁺e⁻ → (DD̅*)⁰π⁰ at √s̅ = 4.226 and 4.257 GeV
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
Keywords: Causality (Physics)
Atomic mass
Zc(3885)
Isobaric spin
Description: Includes supplementary material.
Abstract: A neutral structure in the DD* system around the DD̅* mass threshold is observed with a statistical significance greater than 10σ in the processes e⁺e⁻ → D⁺D*⁻π⁰ + c.c. and e⁺e⁻ → D⁰D̅*⁰π⁰ + c.c. at √s̅ = 4.226 and 4.257 GeV in the BESIII experiment. The structure is denoted as Z_c(3885)⁰. Assuming the presence of a resonance, its pole mass and width are determined to be [3885.7_{-5.7}^{+4.3} (stat) ± 8.4(syst)] MeV/c² and [35_{-12}^{+11} (stat) ± 15(syst)] MeV, respectively. The Born cross sections are measured to be σ[e⁺e⁻ → Z_c(3885)⁰π⁰, Z_c(3885)⁰ → DD̅*] = [77 ± 13(stat) ± 17(syst)] pb at 4.226 GeV and [47 ± 9(stat) ± 10(syst)] pb at 4.257 GeV. The ratio of decay rates B[Z_c(3885)⁰ → D⁺D*⁻ + c.c.]/B[Z_c(3885)⁰ → D⁰D*⁰ + c.c.] is determined to be 0.96 ± 0.18(stat) ± 0.12(syst), consistent with no isospin violation in the process, Z_c(3885)⁰ → DD̅*.
Publisher: Amer Physical Soc
ISSN: 0031-9007
Persistent Link: http://hdl.handle.net/10735.1/4867
http://dx.doi.org/10.1103/PhysRevLett.115.222002
Bibliographic Citation: Ablikim, M., M. N. Achasov, X. C. Ai, O. Albayrak, et al. 2015. "Observation of a neutral structure near the DD̅* mass threshold in e⁺e⁻ → (DD̅*)⁰π⁰ at √s̅ = 4.226 and 4.257 GeV." Physical Review Letters 115(22), doi:10.1103/PhysRevLett.115.222002.
Terms of Use: ©2015 American Physical Society
Sponsors: This work is supported in part by National Key Basic Research Program of China under Contract No. 2015CB856700; National Natural Science Foundation of China (NSFC) under Contracts No. 11125525, No. 11235011, No. 11322544, No. 11335008, and No. 11425524; the Joint Large-Scale Scientific Facility Funds of the NSFC and CAS under Contracts No. 11179007, No. U1232201, and No. U1332201; CAS under Contracts No. KJCX2-YW-N29 and No. KJCX2-YW-N45; Ministry of Development of Turkey under Contract No. DPT2006K-120470; Russian Foundation for Basic Research under Contract No. 14-07-91152; U.S. Department of Energy under Contracts No. DE-FG02-04ER41291, No. DE-FG02-05ER41374, No. DE-SC0012069, and No. DESC0010118; and WCU Program of National Research Foundation of Korea under Contract No. R32-2008-000-10155-0.

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