Observation of e+e−→π+π−ψ(3770) and

M. Ablikim¹,

М. Н. Ачасов²,

P. Adlarson³

et al.

Abstract

Published 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 SCOAP 3. OBSERVATION OF e þ e − → π þ π − ψð3770Þ AND D 1 ð2420Þ 0D0 þ c:c:

Looking for a vector charmoniumlike state Y in e+e−→Zhang1 2020Phys. Rev. D2020View full textAdd to dashboardCite

“…Interestingly, there has appeared some measurement of a Born cross section for e þ e − → D − D 1 ð2420Þ þ þ c:c: [39], in which the cross section line shape is consistent with the previous BESIII's result based on a full reconstruction method [40], and there is some indication of enhanced cross section at the location of Yð4360Þ. Thereby, it seems promising that the predicted Y state could be observed in the open-charm process e þ e − →DD 1 ð2420Þ þ c:c: via either the initial-state radiation or the direct production for the future experiments.…”

Pentaquark and Tetraquark states

“…The BESIII Collaboration has observed the processes e + e − → π + π − ψ(3770) and D 1 (2420) 0 D0 + c.c. for the first time [871] and measured the cross section of the process e + e − → ωχ c0 [872], which provided new useful information to study the XY Z states. Very recently, LHCb has observed CP violation in the charmed meson decays [873], which is definitely an important milestone in the history of particle physics.…”

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“…The former was predicted long ago by Törnqvist [87] with a mass 4015 MeV, and it received intensive studies after the observation of X(3872) [88][89][90][91][92][93]. Recently, the BESIII Collaboration searched for the 0 + (2 ++ ) state in the D D invariant mass spectrum by the process e + e − → π + π − D D [94], but no obvious signal was found. Very recently, the Belle Collaboration studied the γγ → γψ(2S) [95], and reported a hint of new state (with global significance 2.8σ) with mass and width [m, Γ] = [4014.3 ± 4.0 ± 1.5, 4 ± 11 ± 6] MeV, which was conjectured to be the tensor-isoscalar partner of X(3872) [96][97][98].…”