An Improved Limit for Γ_{ee} of X(3872) and Γ_{ee} Measurement of ψ(3686)

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An Improved Limit for Γ_{ee} of X(3872) and Γ_{ee} Measurement of ψ(3686)

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Title: An Improved Limit for Γ_{ee} of X(3872) and Γ_{ee} Measurement of ψ(3686)
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
Item Type: Article
Keywords: Show Keywords
Abstract: Using the data sets taken at center-of-mass energies above 4 GeV by the BESIII detector at the BEPCII storage ring, we search for the reaction e⁺e⁻→ γ(ISR}X(3872) → γ{ISR}π⁺π⁻J/ψ via the Initial State Radiation technique. The production of a resonance with quantum numbers JPC=1⁺⁺ such as the X(3872) via single photon e+e- annihilation is forbidden, but is allowed by a next-to-leading order box diagram. We do not observe a significant signal of X(3872), and therefore give an upper limit for the electronic width times the branching fraction Γ{ee} ^{X(3872)} ℬ(X(3872) → π⁺π⁻J/ψ) < 0.13 eV at the 90% confidence level. This measurement improves upon existing limits by a factor of 46. Using the same final state, we also measure the electronic width of the ψ(3686) to be Γ {ee} ^{ψ(3686)} = 2213 ± 18{stat} ± 99{sys} eV. © 2015 The Authors.
Publisher: Elsevier
ISSN: 0370-2693
Persistent Link: http://hdl.handle.net/10735.1/4058
http://dx.doi.org/10.1016/j.physletb.2015.08.013
Bibliographic Citation: Ablikim, M., M. N. Achasov, X. C. Ai, O. Albayrak, et al. 2015. "An improved limit for Γ_{ee} of X(3872) and Γ_{ee} measurement of ψ(3686)." Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 749, doi: 10.1016/j.physletb.2015.08.013
Terms of Use: CC BY 4.0 (Attribution)
©2015 The Authors
Sponsors: National Key Basic Research Program of China (Contract no.2015CB856700); National Natural Science Foundation of China (NSFC) (Contract nos..11125525, 11235011, 11322544, 11335008, 11425524); Joint Large-Scale Scientific Facility Funds of the NSFC and CAS (contract nos. 11179007, U1232201, U1332201); CAS (contract nos. KJCX2-YW-N29, KJCX2-YW-N45); German Research Foundation DFG (contract no. CRC-1044); Seventh Framework Programme of the European Union under Marie Curie International Incoming Fellowship Grant (agreement no. 627240; Ministry of Development of Turkey (contract no. DPT2006K-120470); Russian Foundation for Basic Research (contract no. 14-07-91152); U.S. Department of Energy (contract nos. DE-FG02-04ER41291, DE-FG02-05ER41374, DE-FG02-94ER40823, DESC0010118); WCU Program of National Research Foundation of Korea (contract no. R32-2008-000-10155-0).

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CC BY 4.0 (Attribution) Except where otherwise noted, this item's license is described as CC BY 4.0 (Attribution)