Measurement of Λ baryon polarization in e+e−→ΛΛ¯ at s=3.773 GeV
Observation of an a0 -like State with Mass of 1.817 GeV in the Study of Ds+→KS0K+π0 Decays
Measurement of the e+e−→ωπ0π0 cross section at center-of-mass energies from 2.0 to 3.08 GeV
Search for baryon and lepton number violating decay D±→n(n¯)e±
First Measurement of Polarizations in the Decay D0→ωφ
Measurement of ψ(3686)→ΛΛ¯η and ψ(3686)→ΛΛ¯π0 decays
Search for hyperon ΔS=ΔQ violating decay Ξ0→Σ−e+νe
Search for a massless dark photon in Λc+→pγ′ decay
Measurement of the CP -even fraction of D0→π+π−π+π−
Spin dependence of {\eta} meson production in proton-proton collisions close to threshold
Taking advantage of the high acceptance and axial symmetry of the WASA-at-COSY detector, and the high degree of the polarized proton beam of COSY, the reaction pp{\to} pp{\eta} has been measured close to threshold to explore the analyzing power Ay. The angular distribution of Ay is determined with the precision improved by more than one order of magnitude with respect to previous results allowing a first accurate comparison with theoretical predictions. The determined analyzing power is consistent with zero for an excess energy of Q = 15 MeV signaling s wave production with no evidence for higher partial waves. At Q = 72 MeV the data reveals strong interference of P s and P p partial waves …
Measurement of the branching fraction for ψ(3686)→ωKS0KS0
Partial wave analysis of J/ψ→γη′η′
Search for X(3872)→π0χc0 and X(3872)→ππχc0 at BESIII
Study of light scalar mesons through Ds+→π0π0e+νe and KS0KS0e+νe decays
Study of the hc(11P1) meson via ψ(2S)→π0hc decays at BESIII
Amplitude analysis of Ds+→π+π−π+
Observation of χcJ→ΛΛ¯η
Observation of the J/ψ and ψ(3686) decays into ηΣ+Σ¯−
Search for baryon- and lepton-number violating decays D0→p¯e+ and D0→pe−
Measurement of the branching fraction of the doubly Cabibbo-suppressed decay D0→K+π−π0 and search for D0→K+π−π0π0
Amplitude analysis and branching-fraction measurement of Ds+→KS0K−π+π+
Using 6.32 fb−1 of e+e− collision data collected by the BESIII detector at the center-of-mass energies between 4.178 and 4.226 GeV, an amplitude analysis of the D+s → K0SK−π+π+ decays is performed ...
Recent Results on Meson Decays from A2
Light meson decays are used to investigate topics related to fundamental aspects of particle physics. Precision measurements of meson Dalitz decays give input to theoretical evaluations of the Hadronic Light-by-Light contribution (HLbL) to the anomalous magnetic moment of the muon. The pseudoscalar η' decays allow for studies of topics like ππ scattering lengths, effective field theories and fundamental symmetries. The A2 collaboration, using the Crystal Ball/TAPS setup at MAMI, has recently published several high precision results on transition form factors which are related to HLbL. The value obtained for the slope parameter of the π0 electromagnetic (e/m) transition form factor (TFF) is …
Future Physics Programme of BESIII
There has recently been a dramatic renewal of interest in the subjects of hadron spectroscopy and charm physics. This renaissance has been driven in part by the discovery of a plethora of charmonium-like $XYZ$ states at BESIII and $B$ factories, and the observation of an intriguing proton-antiproton threshold enhancement and the possibly related $X(1835)$ meson state at BESIII, as well as the threshold measurements of charm mesons and charm baryons. We present a detailed survey of the important topics in tau-charm physics and hadron physics that can be further explored at BESIII over the remaining lifetime of BEPCII operation. This survey will help in the optimization of the data-taking pla…