Observation of e(+)e(-) -> gamma X(3872) at BESIII
2014 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 112, no 9, 092001- p.Article in journal (Refereed) Published
With data samples collected with the BESIII detector operating at the BEPCII storage ring at center-of-mass energies from 4.009 to 4.420 GeV, the process e(+)e(-) -> gamma X(3872) is observed for the first time with a statistical significance of 6.3 sigma. The measured mass of the X(3872) is (3871.9 +/- 0.7(stat) +/- 0.2(syst)) MeV/c(2), in agreement with previous measurements. Measurements of the product of the cross section sigma[e(+)e(-) -> gamma X(3872)] and the branching fraction B [X(3872) -> pi(+)pi(-)J/psi] 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) -> gamma X(3872).
Place, publisher, year, edition, pages
2014. Vol. 112, no 9, 092001- p.
IdentifiersURN: urn:nbn:se:uu:diva-222733DOI: 10.1103/PhysRevLett.112.092001ISI: 000332169000004OAI: oai:DiVA.org:uu-222733DiVA: diva2:712323