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Study of the eβΊeβ» β ΟβΊΟβ»Ο process at center-of-mass energies between 4.0 and 4.6 GeV
(2023)
Using 15.6 fbβ1 of e+eβ collision data collected at twenty-four center-of-mass energies from 4.0 to 4.6 GeV with the BESIII detector, the helicity amplitudes of the process e+eββΟ+ΟβΟ are analyzed for the first time. Born cross section measurements of two-body intermediate resonance states with statistical significance greater than 5Ο are presented, such as f0(500), f0(980), f2(1270), f0(1370), b1(1235)Β±, and Ο(1450)Β±. In addition, evidence of a resonance state in e+eββΟ+ΟβΟ production is found. The mass of this state obtained by line shape fitting is about 4.2 GeV/c2, which is consistent with the production of Ο(4160) or Y(4220).
Study of the eβΊeβ» β ΟβΊΟβ»Ο process at center-of-mass energies between 4.0 and 4.6 GeV
(2023)
Using 15.6 fbβ1 of e+eβ collision data collected at twenty-four center-of-mass energies from 4.0 to 4.6 GeV with the BESIII detector, the helicity amplitudes of the process e+eβ β Ο+ΟβΟ are analyzed for the first time. Born cross section measurements of two-body intermediate resonance states with statistical significance greater than 5Ο are presented, such as f0(500), f0(980), f2(1270), f0(1370), b1(1235)Β±, and Ο(1450)Β±. In addition, evidence of a resonance state in e+eβ β Ο+ΟβΟ production is found. The mass of this state obtained by line shape fitting is about 4.2 GeV/c2, which is consistent with the production of Ο(4160) or Y(4220).
Using a data sample corresponding to an integrated luminosity of 11.3 fbβ1 collected at center-of-mass energies from 4.23 to 4.70 GeV with the BESIII detector, we observe the process e+eβ β Ο0Ο0Ο2(3823) for the first time with a statistical significance of 6.0 standard deviations. The ratio of average cross sections for e+eβ β Ο0Ο0Ο2(3823) and Ο+ΟβΟ2(3823) is determined to be R = Ο[e+eβ β Ο0Ο0Ο2(3823)] Ο[e+eββΟ+ΟβΟ2(3823)] = 0.57 Β± 0.14 Β± 0.05, which is consistent with expectations from isospin symmetry. Here and below, the first uncertainties are statistical and the second are systematic. The mass of the Ο2(3823) is measured to be M[Ο2(3823)] = 3824.5Β±2.4Β±1.0 MeV/c2. Due to the limited data sample, an upper limit of 18.8 MeV at 90% confidence level is set on the intrinsic width of Ο2(3823).
Observation of the decay Ο(3686) β Ξ£β»Ξ£βΎβΊ and measurement of its angular distribution
(2022)
Using (448.1 Β± 2.9) Γ 106 Ο(3686) events collected with the BESIII detector at the BEPCII collider, the decay Ο(3686) β Ξ£β»Ξ£βΎβΊ is observed for the first time with a branching fraction of (2.82 Β± 0.04stat. Β± 0.08syst.) Γ 10β4, and the angular parameter Ξ±Ξ£β is measured to be 0.96 Β± 0.09stat. Β± 0.03syst..
Based on (10087Β±44)Γ106ββπ½/π events collected with the BESIII detector at BEPCII, the double Dalitz decay πβ²βπ+β’πββ’π+β’πβ is observed for the first time via the π½/πβπΎβ’πβ² decay process. The significance is found to be 5.7β’π with systematic uncertainties taken into consideration. Its branching fraction is determined to be β¬β‘(πβ²βπ+β’πββ’π+β’πβ)=(4.5Β±1.0β’(stat)Β±0.5β’(sys))Γ10β6.
By using 6.32 fbβ1 of data collected with the BESIII detector at center-of-mass energies between 4.178 and 4.226 GeV, we perform an amplitude analysis of the decay D+s ! K0S +β0 and determine the relative fractions and phase differences of different intermediate processes, which include K0S (770)+, K0S (1450)+, Kβ(892)0β+, Kβ(892)+β0, and Kβ(1410)0β+. With the detection efficiency based on the amplitude analysis results, the absolute branching fraction is measured to be B(D+s ! K0S +β0) = (5.43 Β± 0.30stat Β± 0.15syst) Γ 10β3.
Using e+eβ annihilation data sets collected with the BESIII detector, we measure the cross sections of the processes e+eββe+eβ and e+eββΞΌ+ΞΌβ at fifteen center-of-mass energy points in the vicinity of the J/Ο resonance. By a simultaneous fit to the measured, center-of-mass energy dependent cross sections of the two processes, the combined quantities ΞeeΞee/Ξtot and ΞeeΞΞΌΞΌ/Ξtot are determined to be (0.346Β±0.009) and (0.335Β±0.006) keV, respectively, where Ξee, ΞΞΌΞΌ, and Ξtot are the electronic, muonic, and total decay widths of the J/Ο resonance, respectively. Using the resultant ΞeeΞΞΌΞΌ/Ξtot and ΞeeΞee/Ξtot, the ratio Ξee/ΞΞΌΞΌ is calculated to be 1.031Β±0.015, which is consistent with the expectation of lepton universality within about two standard deviations. Assuming lepton universality and using the branching fraction of the J/Ο leptonic decay measured by BESIII in 2013, Ξtot and Ξll are determined to be (93.0Β±2.1) and (5.56Β±0.11) keV, respectively, where Ξll is the average leptonic decay width of the J/Ο resonance.
Using a data sample of (448.1Β±2.9)Γ106ββπβ‘(3686) decays collected at an π+β’πβ center-of-mass energy of 3.686 GeV by the BESIII detector at Beijing Electron Positron Collider II, we report an observation of the hindered electromagnetic Dalitz decay πβ‘(3686)βπ+β’πββ’ππ with a significance of 7.9β’π. The branching fraction is determined to be β¬β‘(πβ‘(3686)βπ+β’πββ’ππ)=(3.77Β±0.4β’0statΒ±0.1β’8syst)Γ10β5, agreeing well with the prediction of the vector meson dominance model. This is the first measurement of the electromagnetic Dalitz transition between the πβ‘(3686) and the ππ, which provides new insight into the electromagnetic properties of this decay, and offers new opportunities to measure the absolute branching fractions of ππ decays.
The hadronic decay ππβ‘(2β’π)β3β’(π+β’πβ) is observed with a statistical significance of 9.3 standard deviations using (448.1Β±2.9)Γ106ββπβ‘(3686) events collected by the BESIII detector at the BEPCII collider. The measured mass and width of ππβ‘(2β’π) are (3643.4Β±2.3β(stat)Β±4.4β(syst))ββMeV/π2 and (19.8Β±3.9β(stat)Β±3.1β(syst))ββMeV, respectively, which are consistent with the world average values within two standard deviations. The product branching fraction β¬β‘[πβ‘(3686)βπΎβ’ππβ‘(2β’π)]Γβ¬β‘[ππβ‘(2β’π)β3β’(π+β’πβ)] is measured to be (9.2Β±1.0β(stat)Β±1.2β(syst))Γ10β6. Using β¬β‘[πβ‘(3686)βπΎβ’ππβ‘(2β’π)]=(7.β’0+3.4β2.5)Γ10β4, we obtain β¬β‘[ππβ‘(2β’π)β3β’(π+β’πβ)]=(1.31Β±0.15β(stat)Β±0.17β(syst) (+0.64β0.47)β(extr))Γ10β2, where the third uncertainty is from β¬β‘[πβ‘(3686)βπΎβ’ππβ‘(2β’π)]. We also measure the ππβ’π½β3β’(π+β’πβ) (π½=0, 1, 2) decays via πβ²βπΎβ’ππβ’π½ transitions. The branching fractions are β¬β‘[ππβ’0β3β’(π+β’πβ)]=(2.080Β±0.006β(stat)Β±0.068β(syst))Γ10β2, β¬β‘[ππβ’1β3β’(π+β’πβ)]=(1.092Β±0.004β(stat)Β±0.035β(syst))Γ10β2, and β¬β‘[ππβ’2β3β’(π+β’πβ)]=(1.565Β±0.005β(stat)Β±0.048β(syst))Γ10β2.
The hadronic decay Ξ·c(2S)β3(Ο+Οβ) is observed with a statistical significance of 9.3 standard deviations using (448.1Β±2.9)Γ106 Ο(3686) events collected by the BESIII detector at the BEPCII collider. The measured mass and width of Ξ·c(2S) are (3643.4Β±2.3(stat.)Β±4.4(syst.)) MeV/c2 and (19.8Β±3.9(stat.)Β±3.1(syst.)) MeV, respectively, which are consistent with the world average values within two standard deviations. The product branching fraction B[Ο(3686) β Ξ³Ξ·c(2S)]ΓB[Ξ·c(2S)β3(Ο+Οβ)] is measured to be (9.2Β±1.0(stat.)Β±0.9(syst.))Γ10β6. Using B[Ο(3686)βΞ³Ξ·c(2S)]=(7.0+3.4β2.5)Γ10β4, we obtain B[Ξ·c(2S)β3(Ο+Οβ)]=(1.31Β±0.15(stat.)Β±0.13(syst.)(+0.64β0.47)(extr))Γ10β2, where the third uncertainty is from B[Ο(3686)βΞ³Ξ·c(2S)]. We also measure the ΟcJβ3(Ο+Οβ) (J=0,1,2) decays via Ο(3686)βΞ³ΟcJ transitions. The branching fractions are B[Οc0β3(Ο+Οβ)]=(2.080Β±0.006(stat.)Β±0.068(syst.))Γ10β2, B[Οc1β3(Ο+Οβ)]=(1.092Β±0.004(stat.)Β±0.035(syst.))Γ10β2, and B[Οc2β3(Ο+Οβ)]=(1.565Β±0.005(stat.)Β±0.048(syst.))Γ10β2.