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Using 5.9 pbβ1 of e+eβ annihilation data collected at center-of-mass energies from 3.640 to 3.701 GeV with the BESIII detector at the BEPCII Collider, we measure the observed cross sections of e+eββK0SX (where X=anything). From a fit to these observed cross sections with the sum of continuum and Ο(3686) and J/Ο Breit-Wigner functions and considering initial state radiation and the BEPCII beam energy spread, we obtain for the first time the inclusive decay branching fraction B(Ο(3686)βK0SX)=(16.04Β±0.29Β±0.90)%, where the first uncertainty is statistical and the second is systematic.
Based on 586 pbβ1 of e+eβ annihilation data collected at a center-of-mass energy of sβ=4.6 GeV with the BESIII detector at the BEPCII collider, the absolute branching fraction of Ξ+cβpK0SΞ· decays is measured for the first time to be B(Ξ+cβpK0SΞ·)=(0.414Β±0.084Β±0.028)%, where the first uncertainty is statistical and the second is systematic. The result is compatible with a previous CLEO result on the relative branching fraction B(Ξ+cβpK0SΞ·)B(Ξ+cβpKβΟ+), and consistent with theoretical predictions of SU(3) flavor symmetry.
We report a measurement of the observed cross sections of e+ eβ β J/ΟX based on 3.21 fb β 1 of data accumulated at energies from 3.645 to 3.891 GeV with the BESIII detector operated at the BEPCII collider. In analysis of the cross sections, we measured the decay branching fractions of B(Ο(3686) β J/ΟX) = (64.4 Β± 0.6 Β± 1.6)% and B(Ο(3770) β J/ΟX) = (0.5 Β± 0.2 Β± 0.1)% for the first time. The energy-dependent line shape of these cross sections cannot be well described by two Breit-Wigner (BW) amplitudes of the expected decays Ο (3686) β J/ΟX and Ο(3770) β J/ΟX. Instead, it can be better described with one more BW amplitude of the decay R(3760)β J/ΟX. Under this assumption, we extracted the R (3760) mass M R (3760 ) = 3766.2 Β± 3.8 Β± 0.4 MeV/c2, total width Ξ tot R ( 3760 ) = 22.2 Β± 5.9 Β± 1.4 MeV, and product of leptonic width and decay branching fraction
ΞeeR(3760) B[R(3760) β J/ΟX] = (79.4 Β± 85.5 Β± 11.7) eV. The significance of the R(3760) is 5.3Ο. The first uncertainties of these measured quantities are from fits to the cross sections and second systematic.
Using 2.93ββfbβ1 of π+β’πβ collision data taken at a center-of-mass energy of 3.773 GeV with the BESIII detector, we report the first measurements of the absolute branching fractions of 14 hadronic π·0β’(+) decays to exclusive final states with an π, e.g., π·0βπΎββ’π+β’π, πΎ0πβ’π0β’π, πΎ+β’πΎββ’π, πΎ0πβ’πΎ0πβ’π, πΎββ’π+β’π0β’π, πΎ0πβ’π+β’πββ’π, πΎ0πβ’π0β’π0β’π, and π+β’πββ’π0β’π; π·+βπΎ0πβ’π+β’π, πΎ0πβ’πΎ+β’π, πΎββ’π+β’π+β’π, πΎ0πβ’π+β’π0β’π, π+β’π+β’πββ’π, and π+β’π0β’π0β’π. Among these decays, the π·0βπΎββ’π+β’π and π·+βπΎ0 πβ’π+β’π decays have the largest branching fractions, which are β¬β‘(π·0βπΎββ’π+β’π) = (1.853Β±0.02β’5statΒ±0.03β’1syst)% and β¬β‘(π·+βπΎ0πβ’π+β’π) = (1.309Β±0.03β’7statΒ±0.03β’1syst)%, respectively. The charge-parity asymmetries for the six decays with highest event yields are determined, and no statistically significant charge-parity violation is found.
Using 2.93ββfbβ1 of π+β’πβ collision data taken at a center-of-mass energy of 3.773 GeV by the BESIII detector at the BEPCII, we measure the branching fractions of the singly Cabibbo-suppressed decays π·βπβ’πβ’π to be β¬β‘(π·0βπβ’π+β’πβ)=(1.33Β±0.16Β±0.12)Γ10β3 and β¬β‘(π·+βπβ’π+β’π0)=(3.87Β±0.83Β±0.25)Γ10β3, where the first uncertainties are statistical and the second ones systematic. The statistical significances are 12.9β’π and 7.7β’π, respectively. The precision of β¬β‘(π·0βπβ’π+β’πβ) is improved by a factor of 2.1 over prior measurements, and β¬β‘(π·+βπβ’π+β’π0) is measured for the first time. No significant signal for π·0βπβ’π0β’π0 is observed, and the upper limit on the branching fraction is β¬β‘(π·0βπβ’π0β’π0)<1.10Γ10β3 at the 90% confidence level. The branching fractions of π·βπβ’πβ’π are also measured and consistent with existing results.
We report an amplitude analysis and branching fraction measurement of D+sβK+KβΟ+ decay using a data sample of 3.19 fbβ1 recorded with BESIII detector at a center-of-mass energy of 4.178 GeV.
We perform a model-independent partial wave analysis in the low K+Kβ mass region to determine the K+Kβ S-wave lineshape, followed by an amplitude analysis of our very pure high-statistics sample.
The amplitude analysis provides an accurate determination of the detection efficiency allowing us to measure the branching fraction B(D+sβK+KβΟ+)=(5.47Β±0.08statΒ±0.13sys)%.
We report an amplitude analysis and branching fraction measurement of D+sβK+KβΟ+ decay using a data sample of 3.19 fbβ1 recorded with BESIII detector at a center-of-mass energy of 4.178 GeV.
We perform a model-independent partial wave analysis in the low K+Kβ mass region to determine the K+Kβ S-wave lineshape, followed by an amplitude analysis of our very pure high-statistics sample.
The amplitude analysis provides an accurate determination of the detection efficiency allowing us to measure the branching fraction B(D+sβK+KβΟ+)=(5.47Β±0.08statΒ±0.13sys)%.
We report an amplitude analysis and branching fraction measurement of D+sβK+KβΟ+ decay using a data sample of 3.19 fbβ1 recorded with BESIII detector at a center-of-mass energy of 4.178 GeV.
We perform a model-independent partial wave analysis in the low K+Kβ mass region to determine the K+Kβ S-wave lineshape, followed by an amplitude analysis of our very pure high-statistics sample.
The amplitude analysis provides an accurate determination of the detection efficiency allowing us to measure the branching fraction B(D+sβK+KβΟ+)=(5.47Β±0.08statΒ±0.13sys)%.
The rare decay πβ²βπ+β’πββ’π+β’πβ is studied using a sample of 1.3Γ109ββπ½/π events collected with the BESIII detector at BEPCII in 2009 and 2012. The branching fraction is measured with improved precision to be (2.42Β±0.0β’5statΒ±0.0β’8syst)Γ10β3. Due to the inclusion of new data, this result supersedes the last BESIII result on this branching fraction. In addition, the πΆβ’π-violating asymmetry in the angle between the decay planes of the π+β’πβ-pair and the π+β’πβ-pair is investigated. A measurable value would indicate physics beyond the standard model; the result is ππΆβ’π=(2.9Β±3.β’7statΒ±1.β’1syst)%, which is consistent with the standard model expectation of no πΆβ’π-violation. The precision is comparable to the asymmetry measurement in the πΎ0πΏβπ+β’πββ’π+β’πβ decay where the observed (14Β±2)% effect is driven by a standard model mechanism.
Using (1310.6Β±7.0)Γ106 π½/π events acquired with the BESIII detector at the BEPCII storage rings, the decay πβ²βπ+β’πββ’π+β’πβ is observed for the first time with a significance of 8β’π via the process π½/πβπΎβ’πβ². We measure the branching fraction of πβ²βπ+β’πββ’π+β’πβ to be β¬β‘(πβ²βπ+β’πββ’π+β’πβ)=(1.97Β±0.33β’(stat)Β±0.19β’(syst))Γ10β5, where the first and second uncertainties are statistical and systematic, respectively