2017/08/31 by Si-Run Xue, Hao-Jie Jing, Feng-Kun Guo +2 · 17 citations
Mathematics · Physics and Astronomy · #Charm (quantum number) #Electron–positron annihilation #Geometry #Hadron #High-Energy Particle Collisions Research #Line (geometry) #Mathematics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-ph #nucl-ex #nucl-th
paper · pdf · doi:10.1016/j.physletb.2018.02.027
published in Physics Letters B 779, 402-408 (Elsevier BV) · Revtex, 17 pages, 5 eps figures; Revised version to appear in Phys. Lett. B
openalex created_date 2017/08/31 · arxiv created 2018/02/13 · openalex publication_date 2018/02/21 · arxiv updated 2018/04/04 · openalex updated_date 2026/08/05
Whether the Y(4260) can couple to open charm channels has been a crucial issue for understanding its nature. The available experimental data suggest that the cross section line shapes of exclusive processes in e+e− annihilations have nontrivial structures around the mass region of the Y(4260). As part of a series of studies of the Y(4260) as mainly a D¯D1(2420)+c.c. molecular state, we show that the partial widths of the Y(4260) to the two-body open charm channels of e+e−→D⁎D¯⁎ and Ds⁎D¯s⁎ are much smaller than that to D¯D⁎π+c.c.. The line shapes measured by the Belle Collaboration for these two channels can be well described by the vector charmonium states ψ(4040), ψ(4160) and ψ(4415) together with the Y(4260). It turns out that the interference of the Y(4260) with the other charmonia produces a dip around 4.22 GeV in the e+e−→D⁎D¯⁎ cross section line shape. The data also show an evidence for the strong coupling of the Y(4260) to the DD¯1(2420), in line with the expectation in the hadronic molecular scenario for the Y(4260).