Observation of an a_{0}-like State with Mass of 1.817 GeV in the Study of D_{s}^{+}→K_{S}^{0}K^{+}π^{0} Decays

Using e^{+}e^{-} annihilation data corresponding to an integrated luminosity of 6.32  fb^{-1} collected at center-of-mass energies between 4.178 and 4.226 GeV with the BESIII detector, we perform the first amplitude analysis of the decay D_{s}^{+}→K_{S}^{0}K^{+}π^{0} and determine the relative branching fractions and phases for intermediate processes. We observe an a_{0}-like state with mass of 1.817 GeV in its decay to K_{S}^{0}K^{+} for the first time. In addition, we measure the ratio {B[D_{s}^{+}→K[over ¯]^{*}(892)^{0}K^{+}]/B[D_{s}^{+}→K[over ¯]^{0}K^{*}(892)^{+}]} to be 2.35_{-0.23stat}^{+0.42}±0.10_{syst}. Finally, we provide a precision measurement of the absolute branching fraction B(D_{s}^{+}→K_{S}^{0}K^{+}π^{0})=(1.46±0.06_{stat}±0.05_{syst})%.

Overview of most recent BESIII results

Since 2009, the BESIII experiment has been colliding e+e− beams in the energy range between 2.0 and 4.9 GeV. This allowed the BESIII Collaboration to collect three of the largest data sets of charmonium resonances (J/ψ, ψ(2S), and ψ(3770)) in the world as well as other data sets at the centre-of-mass energies above 3.8 GeV. These datasets allow BESIII to deepen the knowledge of the properties of charmonia; investigate the light hadrons spectra; probe the decay and production mechanism of charmed mesons; search for the exotic XYZ hadrons and to understand their nature; perform precision Quantum ChromoDynamics measurements (such as R-value measurements and Form Factors estimations). Some of the most recent and noteworthy results from the BESIII collaboration are presented.