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Using a data sample of π+β’πβ collisions corresponding to an integrated luminosity of 567ββpbβ1 collected at a center-of-mass energy of βπ =4.6ββGeV with the BESIII detector, we measure the absolute branching fraction of the inclusive semileptonic Ξ+π decay with a double-tag method. We obtain β¬β‘(Ξ+πβπβ’π+β’ππ)=(3.95Β±0.34Β±0.09)%, where the first uncertainty is statistical and the second systematic. Using the known Ξ+π lifetime and the charge-averaged semileptonic decay width of nonstrange charmed mesons (π·0 and π·+), we obtain the ratio of the inclusive semileptonic decay widths Ξβ‘(Ξ+πβπβ’π+β’ππ)/Β―Ξβ‘(π·βπβ’π+β’ππ)=1.26Β±0.12.
The cross section of the process e+eββK+Kβ is measured at a number of center-of-mass energies sβ from 2.00 to 3.08 GeV with the BESIII detector at the Beijing Electron Positron Collider (BEPCII). The results provide the best precision achieved so far. A resonant structure around 2.2 GeV is observed in the cross section line shape. A Breit-Wigner fit yields a mass of M=2239.2Β±7.1Β±11.3~and a width of Ξ=139.8Β±12.3Β±20.6 MeV, where the first uncertainties are statistical and the second ones are systematic. In addition, the time-like electromagnetic form factor of the kaon is determined at the individual center-of-mass energy points.
Search for heavy Majorana neutrino in lepton number violating decays of DβββKΟeβΊeβΊ
(2019)
Using a data sample with an integrated luminosity of 2.93ββfbβ1 taken at the center-of-mass energy of 3.773 GeV, we search for the Majorana neutrino (ππ) in the lepton number violating decays π·βπΎβ’πβ’π+β’π+. No significant signal is observed, and the upper limits on the branching fraction at the 90% confidence level are set to be β¬β‘(π·0βπΎββ’πββ’π+β’π+)<2.8Γ10β6, β¬β‘(π·+βπΎ0πβ’πββ’π+β’π+)<3.3Γ10β6 and β¬β‘(π·+βπΎββ’π0β’π+β’π+)<8.5Γ10β6. The Majorana neutrino is searched for with different mass assumptions ranging from 0.25 to 1.0ββGeV/π2 in the decays π·0βπΎββ’π+β’ππ,ππβπββ’π+ and π·+βπΎ0πβ’π+β’ππ,ππβπββ’π+, and the upper limits on the branching fraction at the 90% confidence level are at the level of 10β7βΌ10β6, depending on the mass of the Majorana neutrino. The constraints on the mixing matrix element |ππβ’ππ|2 are also evaluated.
Using a sample of 4.48Γ108 Ο(3686) events collected with the BESIII detector at the BEPCII collider, we study the two-photon decays of the pseudoscalar mesons Ο0, Ξ·, Ξ·β², Ξ·(1405), Ξ·(1475), Ξ·(1760), and X(1835) in J/Ο radiative decays using Ο(3686)βΟ+ΟβJ/Ο events. The Ο0, Ξ· and Ξ·β² mesons are clearly observed in the two-photon mass spectra, and the branching fractions are determined to be B(J/ΟβΞ³Ο0β3Ξ³)=(3.57Β±0.12Β±0.16)Γ10β5, B(J/ΟβΞ³Ξ·β3Ξ³)=(4.42Β±0.04Β±0.18)Γ10β4, and B(J/ΟβΞ³Ξ·β²β3Ξ³)=(1.26Β±0.02Β±0.05)Γ10β4, where the first errors are statistical and the second systematic. No clear signal for Ξ·(1405), Ξ·(1475), Ξ·(1760) or X(1835) is observed in the two-photon mass spectra, and upper limits at the 90% confidence level on the product branching fractions are obtained.
Using a data sample of e+eβ collision data corresponding to an integrated luminosity of 2.93 fbβ1 collected with the BESIII detector at a center-of-mass energy of s=3.773GeV, we search for the singly Cabibbo-suppressed decays D0βΟ0Ο0Ο0, Ο0Ο0Ξ·, Ο0Ξ·Ξ· and Ξ·Ξ·Ξ· using the double tag method. The absolute branching fractions are measured to be B(D0βΟ0Ο0Ο0)=(2.0Β±0.4Β±0.3)Γ10β4, B(D0βΟ0Ο0Ξ·)=(3.8Β±1.1Β±0.7)Γ10β4 and B(D0βΟ0Ξ·Ξ·)=(7.3Β±1.6Β±1.5)Γ10β4 with the statistical significances of 4.8Ο, 3.8Ο and 5.5Ο, respectively, where the first uncertainties are statistical and the second ones systematic. No significant signal of D0βΞ·Ξ·Ξ· is found, and the upper limit on its decay branching fraction is set to be B(D0βΞ·Ξ·Ξ·)<1.3Γ10β4 at the 90% confidence level.
We report the first measurements of absolute branching fractions for the W -exchange-only processes + c β 0K + and + c β (1530)0K + with the double-tag technique, by analyzing an e+eβ collision data sample, that corresponds to an integrated luminosity of 567 pbβ1 collected at a center-of-mass energy of 4.6 GeV by the BESIII detector. The branching fractions are measured to be B(+c β 0K +) = (5.90 Β± 0.86 Β± 0.39) Γ 10β3 and B(+c β (1530)0K +) = (5.02 Β± 0.99 Β± 0.31) Γ 10β3, where the first uncertainties are statistical and the second systematic. Our results are more precise than the previous relative measurements.
Using a data sample of 448.1 Γ 106 Ο(3686) events collected with the BESIII detector at the BEPCII collider, we report the first observation of the electromagnetic Dalitz decay Ο(3686) β Ξ· e+eβ, with significances of 7.0Ο and 6.3Ο when reconstructing the Ξ· meson via its decay modes Ξ· β Ξ³Ο+Οβ and Ξ· β Ο+ΟβΞ· (Ξ· β Ξ³Ξ³ ), respectively. The weighted average branching fraction is determined to be B(Ο(3686) β Ξ· e+eβ) = (1.90 Β± 0.25 Β± 0.11) Γ 10β6, where the first uncertainty is statistical and the second systematic.
The process π+β’πββπβ’πβ² has been studied for the first time in detail using data sample collected with the BESIII detector at the BEPCII collider at center of mass energies from 2.05 to 3.08 GeV. A resonance with quantum numbers π½πβ’πΆ=1ββ is observed with mass π=(2177.5Β±4.8β’(stat)Β±19.5β’(syst))β’MeV/π2 and width Ξ=(149.0Β±15.6β’(stat)Β±8.9β’(syst))ββMeV with a statistical significance larger than 10β’π, including systematic uncertainties. If the observed structure is identified with the πβ‘(2170), then the ratio of partial width between the πβ’πβ² by BESIII and πβ’π by BABAR is (β¬π
πβ’πβ’Ξπ
πβ’π)/(β¬π
πβ’πβ²β’Ξπ
πβ’π)=0.23Β±0.10β’(stat)Β±0.18β’(syst), which is smaller than the prediction of the π β’Β―π β’π hybrid models by several orders of magnitude.
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.
Using a low background data sample of 9.7Γ105ββπ½/πβπΎβ’πβ², πβ²βπΎβ’π+β’πβ events, which are 2 orders of magnitude larger than those from the previous experiments, recorded with the BESIII detector at BEPCII, the decay dynamics of πβ²βπΎβ’π+β’πβ are studied with both model-dependent and model-independent approaches. The contributions of π and the πβ‘(770)βπ interference are observed for the first time in the decays πβ²βπΎβ’π+β’πβ in both approaches. Additionally, a contribution from the box anomaly or the πβ‘(1450) resonance is required in the model-dependent approach, while the process specific part of the decay amplitude is determined in the model-independent approach.