Observation of e+e- → γx(3872) at BESIII


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Ablikim M., Achasov M., Ai X., Albayrak O., Ambrose D., An F., ...More

Physical Review Letters, vol.112, no.9, 2014 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 112 Issue: 9
  • Publication Date: 2014
  • Doi Number: 10.1103/physrevlett.112.092001
  • Journal Name: Physical Review Letters
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Ankara University Affiliated: Yes

Abstract

With data samples collected with the BESIII detector operating at the BEPCII storage ring at center-ofmass energies from 4.009 to 4.420 GeV, the process e+e-→ γX(3872) is observed for the first time with a statistical significance of 6.3σ. The measured mass of the X(3872) is (3871.9 ± 0.7stat± 0.2syst) MeV/c2, in agreement with previous measurements. Measurements of the product of the cross section σ[e+e-→ γX(3872)] and the branching fraction B[X(3872) → π+π-J/ψ] at center-of-mass energies 4.009, 4.229, 4.260, and 4.360 GeV are reported. Our measurements are consistent with expectations for the radiative transition process Y(4260) → γX(3872).