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• W2896047528 abstract "Using 1.31×109 J/ψ events collected by the BESIII detector at the BEPCII e+e− collider, we report the first observation of the h1(1380) in J/ψ→η′h1(1380) with a significance of more than ten standard deviations. The mass and width of the possible axial-vector strangeonium candidate h1(1380) are measured to be M=(1423.2±2.1±7.3) MeV/c2 and Γ=(90.3±9.8±17.5) MeV. The product branching fractions, assuming no interference, are determined to be B(J/ψ→η′h1(1380))×B(h1(1380)→K*(892)+K−+c.c.)=(1.51±0.09±0.21)×10−4 in η′K+K−π0 mode and B(J/ψ→η′h1(1380))×B(h1(1380)→K*(892)K¯+c.c.)=(2.16±0.12±0.29)×10−4 in η′KS0K±π∓ mode. The first uncertainties are statistical and the second are systematic. Isospin symmetry violation is observed in the decays h1(1380)→K*(892)+K−+c.c. and h1(1380)→K*(892)0K¯0+c.c.. Based on the measured h1(1380) mass, the mixing angle between the states h1(1170) and h1(1380) is determined to be (35.9±2.6)°, consistent with theoretical expectations.Received 17 April 2018DOI:https://doi.org/10.1103/PhysRevD.98.072005Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasHadronic decaysParticle decaysParticle phenomenaParticles & Fields" @default.
• W2896047528 created "2018-10-26" @default.
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