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Using 2.93 fbβ1 of e+eβ collision data taken with the BESIII detector at a center-of-mass energy of 3.773 GeV, the observation of the D0βK1(1270)βe+Ξ½e semileptonic decay is presented. The statistical significance of the decay D0βK1(1270)βe+Ξ½e is greater than 10Ο. The branching fraction of D0βK1(1270)βe+Ξ½e is measured to be (1.09Β±0.13+0.09β0.13Β±0.12)Γ10β3. Here, the first uncertainty is statistical, the second is systematic, and the third originates from the assumed branching fraction of K1(1270)ββKβΟ+Οβ.
Using 2.93 fbβ1 of e+eβ collision data taken with the BESIII detector at a center-of-mass energy of 3.773 GeV, the observation of the D0βK1(1270)βe+Ξ½e semileptonic decay is presented. The statistical significance of the decay D0βK1(1270)βe+Ξ½e is greater than 10Ο. The branching fraction of D0βK1(1270)βe+Ξ½e is measured to be (1.09Β±0.13+0.09β0.16Β±0.12)Γ10β3. Here, the first uncertainty is statistical, the second is systematic, and the third originates from the assumed branching fraction of K1(1270)ββKβΟ+Οβ. The fraction of longitudinal polarization in D0βK1(1270)βe+Ξ½e is determined for the first time to be 0.50Β±0.19statΒ±0.08syst.
Using 2.93 fbβ1 of e+eβ collision data collected with the BESIII detector at a center-of-mass energy of 3.773 GeV, we measure the absolute branching fractions of the decays D0βKβe+Ξ½e and D+βKΒ―0e+Ξ½e to be (3.567Β±0.031statΒ±0.025syst)% and (8.68Β±0.14statΒ±0.16syst)%, respectively. Starting with the process e+eββDDΒ―, a new reconstruction method is employed to select events that contain candidates for both DβKΒ―e+Ξ½e and DΒ―βKeβΞ½Β―e decays. The branching fractions reported in this work are consistent within uncertainties with previous BESIII measurements that selected events containing DβKΒ―e+Ξ½e and hadronic DΒ― decays. Combining our results with the lifetimes of the D0 and D+ mesons and the previous BESIII measurements leads to a ratio of the two decay partial widths of ΞΒ―D0βKβe+Ξ½eΞΒ―D+βKΒ―0e+Ξ½e=1.039Β±0.021. This ratio supports isospin symmetry in the D0βKβe+Ξ½e and D+βKΒ―0e+Ξ½e decays within 1.9Ο.
Using 2.93 fbβ1 of e+eβ collision data collected with the BESIII detector at a center-of-mass energy of 3.773~GeV, we measure the absolute branching fractions of the decays D0βKβe+Ξ½e and D+βKΒ―0e+Ξ½e to be (3.574Β±0.031statΒ±0.025syst)% and (8.70Β±0.14statΒ±0.16syst)%, respectively. Starting with the process e+eββDDΒ―, a new reconstruction method is employed to select events that contain candidates for both DβKΒ―e+Ξ½e and DΒ―βKeβΞ½Β―e decays. The branching fractions reported in this work are consistent within uncertainties with previous BESIII measurements that selected events containing DβKΒ―e+Ξ½e and inclusive hadronic DΒ― decays. Combining our results with the lifetimes of the D0 and D+ mesons and the previous BESIII measurements leads to a ratio of the two decay partial widths of ΞΒ―D0βKβe+Ξ½eΞΒ―D+βKΒ―0e+Ξ½e=1.040Β±0.021. This ratio supports isospin symmetry in the D0βKβe+Ξ½e and D+βKΒ―0e+Ξ½e decays within 1.9Ο.
Using a dedicated data sample taken in 2018 on the J/Ο peak, we perform a detailed study of the trigger efficiencies of the BESIII detector. The efficiencies are determined from three representative physics processes, namely Bhabha scattering, dimuon production and generic hadronic events with charged particles. The combined efficiency of all active triggers approaches 100% in most cases, with uncertainties small enough not to affect most physics analyses.
The Born cross sections for the process e+eββΞ·β²Ο+Οβ at different center-of-mass energies between 2.00 and 3.08~GeV are reported with improved precision from an analysis of data samples collected with the BESIII detector operating at the BEPCII storage ring. An obvious structure is observed in the Born cross section line shape. Fit as a Breit-Wigner resonance, it has a statistical significance of 6.3Ο and a mass and width of M=(2108Β±46Β±25)~MeV/c2 and Ξ=(138Β±36Β±30)~MeV, where the uncertainties are statistical and systematic, respectively. These measured resonance parameters agree with the measurements of BABAR in e+eββΞ·β²Ο+Οβ and BESIII in e+eββΟΟ0 within two standard deviations.
The Born cross sections for the process e+eββΞ·β²Ο+Οβ at different center-of-mass energies between 2.00 and 3.08 GeV are reported with improved precision from an analysis of data samples collected with the BESIII detector operating at the BEPCII storage ring. An obvious structure is observed in the Born cross section line shape. Fit as a Breit-Wigner resonance, it has a statistical significance of 6.3Ο and a mass and width of M=(2111Β±43Β±25)~MeV/c2 and Ξ=(135Β±34Β±30)~MeV, where the uncertainties are statistical and systematic, respectively. These measured resonance parameters agree with the measurements of BABAR in e+eββΞ·β²Ο+Οβ and BESIII in e+eββΟΟ0 within two standard deviations.
The Born cross sections for the process e+eββΞ·β²Ο+Οβ at different center-of-mass energies between 2.00 and 3.08~GeV are reported with improved precision from an analysis of data samples collected with the BESIII detector operating at the BEPCII storage ring. An obvious structure is observed in the Born cross section line shape. Fit as a Breit-Wigner resonance, it has a statistical significance of 6.3Ο and a mass and width of M=(2108Β±46Β±25)~MeV/c2 and Ξ=(138Β±36Β±30)~MeV, where the uncertainties are statistical and systematic, respectively. These measured resonance parameters agree with the measurements of BABAR in e+eββΞ·β²Ο+Οβ and BESIII in e+eββΟΟ0 within two standard deviations.
Using a sample of 106 million πβ‘(3686) decays, πβ‘(3686)βπΎβ’ππβ’π½β‘(π½=0,1,2) and πβ‘(3686)βπΎβ’ππβ’π½,ππβ’π½βπΎβ’π½/πβ‘(π½=1,2) events are utilized to study inclusive ππβ’π½βanything, ππβ’π½βhadrons, and π½/πβanything distributions, including distributions of the number of charged tracks, electromagnetic calorimeter showers, and π0β’s, and to compare them with distributions obtained from the BESIII Monte Carlo simulation. Information from each Monte Carlo simulated decay event is used to construct matrices connecting the detected distributions to the input predetection βproducedβ distributions. Assuming these matrices also apply to data, they are used to predict the analogous produced distributions of the decay events. Using these, the charged particle multiplicities are compared with results from MARK I. Further, comparison of the distributions of the number of photons in data with those in Monte Carlo simulation indicates that G-parity conservation should be taken into consideration in the simulation.
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.