Based on a sample of (1310.6±10.5)×10 6 J/ψ events collected with the BESIII detector operating at the BEPCII storage ring, a partial wave analysis of the decay J/ψ → γφφ is performed in order to study the intermediate states.
+56−33 MeV/c 2 , are observed. In addition to these three pseudoscalar states, the scalar state f0(2100), and three tensor states, the f2(2010), f2(2300) and f2(2340), are observed in the process J/ψ → γφφ. The product branching fractions B(J/ψ → γX) × B(X → φφ) are reported.
Based on a sample of 1.31 × 10 9 J=ψ events collected with the BESIII detector, the matrix elements for the decays η 0 → ηπ þ π − and η 0 → ηπ 0 π 0 are determined using 351,016 η 0 → ðη → γγÞπ þ π − and 56,249 η 0 → ðη → γγÞπ 0 π 0 events with background levels less than 1%. Two commonly used representations are used to describe the Dalitz plot density. We find that an assumption of a linear amplitude does not describe the data well. A small deviation of the obtained matrix elements between η 0 → ηπ þ π − and η 0 → ηπ 0 π 0 is probably caused by the mass difference between charged and neutral pions or radiative corrections. No cusp structure in η 0 → ηπ 0 π 0 is observed.
Analysis of D+ -> (K)over-bar(0)e(+)nu(e) and D+ -> pi(0)e(+)nu(e) semileptonic decays Haddadi, Zahra; Kalantar-Nayestanaki, Nasser; Kavatsyuk, Myroslav; Löhner, Herbert; Messchendorp, Johannes; Tiemens, M.; BESIII Collaboration Link to publication in University of Groningen/UMCG research database Citation for published version (APA): Haddadi, Z., Kalantar-Nayestanaki, N., Kavatsyuk, M., Löhner, H., Messchendorp, J. G., Tiemens, M., & BESIII Collaboration (2017). Analysis of D+ -> (K)over-bar(0)e(+)nu(e) and D+ -> pi(0)e(+)nu(e) semileptonic decays. Physical Review D, 96(1), [012002]. DOI: 10.1103/PhysRevD.96.012002 Copyright Other than for strictly personal use, it is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license (like Creative Commons).Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum.
Using 448.0 × 10 6 ψ(3686) events collected with the BESIII detector, an amplitude analysis is performed for ψ(3686) → γχc1, χc1 → ηπ + π − decays. The most dominant two-body structure observed is a0 (980) ± π ∓ ; a0(980) ± → ηπ ± . The a0(980) line shape is modeled using a dispersion relation, and a significant non-zero a0(980) coupling to the η ′ π channel is measured. We observe χc1 → a2(1700)π production for the first time, with a significance larger than 17σ. The production of mesons with exotic quantum numbers, J P C = 1 −+ , is investigated, and upper limits for the branching fractions χc1 → π1(1400) ± π ∓ , χc1 → π1(1600) ± π ∓ , and χc1 → π1(2015) ± π ∓ , with subsequent π1(X) ± → ηπ ± decay, are determined.
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