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During the 2016-17 and 2018-19 running periods, the BESIII experiment collected 7.5~fbβ1 of e+eβ collision data at center-of-mass energies ranging from 4.13 to 4.44 GeV. These data samples are primarily used for the study of excited charmonium and charmoniumlike states. By analyzing the di-muon process e+eββ(Ξ³ISR/FSR)ΞΌ+ΞΌβ, we measure the center-of-mass energies of the data samples with a precision of 0.6 MeV. Through a run-by-run study, we find that the center-of-mass energies were stable throughout most of the data-taking period.
We measure the inclusive semielectronic decay branching fraction of the D+s meson. A double-tag technique is applied to e+eβ annihilation data collected by the BESIII experiment at the BEPCII collider, operating in the center-of-mass energy range 4.178β4.230 GeV. We select positrons from D+sβXe+Ξ½e with momenta greater than 200 MeV/c, and determine the laboratory momentum spectrum, accounting for the effects of detector efficiency and resolution. The total positron yield and semielectronic branching fraction are determined by extrapolating this spectrum below the momentum cutoff. We measure the D+s semielectronic branching fraction to be B(D+sβXe+Ξ½e)=(6.30Β±0.13(stat.)Β±0.10(syst.))%, showing no evidence for unobserved exclusive semielectronic modes. We combine this result with external data taken from literature to determine the ratio of the D+s and D0 semielectronic widths, Ξ(D+sβXe+Ξ½e)Ξ(D0βXe+Ξ½e)=0.790Β±0.016(stat.)Β±0.020(syst.). Our results are consistent with and more precise than previous measurements.
Using a sample of about 1010ββπ½/π events collected at a center-of-mass energy βπ =3.097ββGeV with the BESIII detector, the electromagnetic Dalitz decays π½/πβπ+β’πββ’π+β’πββ’πβ², with πβ²βπΎβ’π+β’πβ and πβ²βπ+β’πββ’π, have been studied. The decay π½/πβπ+β’πββ’πβ‘(1835) is observed with a significance of 15β’π, and also an π+β’πβ invariant-mass dependent transition form factor of π½/πβπ+β’πββ’πβ‘(1835) is presented for the first time. The intermediate states πβ‘(2120) and πβ‘(2370) are also observed in the π+β’πββ’πβ² invariant-mass spectrum with significances of 5.3β’π and 7.3β’π. The corresponding product branching fractions for π½/πβπ+β’πββ’π, πβπ+β’πββ’πβ² [π=πβ‘(1835), πβ‘(2120), and πβ‘(2370)] are reported.
Using e+eβ collision data at ten center-of-mass energies between 2.644 and 3.080 GeV collected with the BESIII detector at BEPCII and corresponding to an integrated luminosity of about 500 pbβ1, we measure the cross sections and effective form factors for the process e+eββΞ0ΞΒ―0 utilizing a single-tag method. A fit to the cross section of e+eββΞ0ΞΒ―0 with a pQCD-driven power function is performed, from which no significant resonance or threshold enhancement is observed. In addition, the ratio of cross sections for the processes e+eββΞβΞΒ―+ and Ξ0ΞΒ―0 is calculated using recent BESIII measurement and is found to be compatible with expectation from isospin symmetry.
Using e+eβ collision data at ten center-of-mass energies between 2.644 and 3.080 GeV collected with the BESIII detector at BEPCII and corresponding to an integrated luminosity of 500.0 pbβ1, we measure the cross sections and effective form factors for the process e+eββΞ0ΞΒ―0 utilizing a single-tag method. A fit to the cross section of e+eββΞ0ΞΒ―0 with a pQCD-driven power function is performed, from which no significant resonance or threshold enhancement is observed. In addition, the ratio of cross sections for the processes e+eββΞβΞΒ―+ and Ξ0ΞΒ―0 is calculated using recent BESIII measurement and is found to be compatible with expectation from isospin symmetry.
Using 448.1 Γ 106 Ο(3686) decays collected with the BESIII detector at the BEPCII e+eβ storage rings, the branching fractions and angular distributions of the decays ΟcJ β ΞβΞΒ―Β―Β―Β―+ and Ξ0ΞΒ―Β―Β―Β―0 (J = 0, 1, 2) are measured based on a partial-reconstruction technique. The decays Οc1 β Ξ0ΞΒ―Β―Β―Β―0 and Οc2 β Ξ0ΞΒ―Β―Β―Β―0 are observed for the first time with statistical significances of 7Ο and 15Ο, respectively. The results of this analysis are in good agreement with previous measurements and have significantly improved precision.
We report on the first search for Β―ΞβΞ oscillations in the decay π½/πβπβ’πΎββ’Β―Ξ+c.c. by analyzing 1.31Γ109ββπ½/π events accumulated with the BESIII detector at the BEPCII collider. The π½/π events are produced using π+β’πβ collisions at a center of mass energy βπ =3.097ββGeV. No evidence for hyperon oscillations is observed. The upper limit for the oscillation rate of Β―Ξ to Ξ hyperons is determined to be π«β‘(Ξ)=[β¬β‘(π½/πβπβ’πΎββ’Ξ+c.c.)/β¬β‘(π½/πβπβ’πΎββ’Β―Ξ+c.c.)]<4.4Γ10β6 corresponding to an oscillation parameter πΏβ’πΞβ’Β―Ξ of less than 3.8Γ10β18ββGeV at the 90% confidence level.
Relative fractions and phases of the intermediate decays are determined. With the detection efficiency estimated by the results of the amplitude analysis, the branching fraction of DΓΎ s β KβKΓΎΟΓΎΟ0 decay is measured to be Γ°5.42 0.10stat 0.17systΓ%.
An amplitude analysis of the πΎπβ’πΎπ system produced in radiative π½/π decays is performed using the (1310.6Β±7.0)Γ106ββπ½/π decays collected by the BESIII detector. Two approaches are presented. A mass-dependent analysis is performed by parametrizing the πΎπβ’πΎπ invariant mass spectrum as a sum of Breit-Wigner line shapes. Additionally, a mass-independent analysis is performed to extract a piecewise function that describes the dynamics of the πΎπβ’πΎπ system while making minimal assumptions about the properties and number of poles in the amplitude. The dominant amplitudes in the mass-dependent analysis include the π0β‘(1710), π0β‘(2200), and πβ²2β‘(1525). The mass-independent results, which are made available as input for further studies, are consistent with those of the mass-dependent analysis and are useful for a systematic study of hadronic interactions. The branching fraction of radiative π½/π decays to πΎπβ’πΎπ is measured to be (8.1Β±0.4)Γ10β4, where the uncertainty is systematic and the statistical uncertainty is negligible.
Measurement of the absolute branching fraction of the inclusive decay ΞcβΊβββΞβ
+β
X
(2018)
Based on an π+β’πβ collision data sample corresponding to an integrated luminosity of 567ββpbβ1 taken at the center-of-mass energy of βπ =4.6ββGeV with the BESIII detector, we measure the absolute branching fraction of the inclusive decay Ξ+πβΞ+π to be β¬β‘(Ξ+πβΞ+π)=(38.β’2+2.8β2.2Β±0.9)% using the double-tag method, where π refers to any possible final state particles. In addition, we search for direct πΆβ’π violation in the charge asymmetry of this inclusive decay for the first time, and obtain ππΆβ’πβ‘[β¬β‘(Ξ+πβΞ+π)ββ¬β‘(Β―Ξβπ β Β―Ξ+π)]/[β¬β‘(Ξ+πβΞ+π)+β¬β‘(Β―Ξβπ β Β―Ξ+π)]=(2.β’1+7.0β6.6Β±1.6)%, a statistically limited result with no evidence of πΆβ’π violation.