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Institute
The decays of Οc2βK+KβΟ0, KSKΒ±Οβ and Ο+ΟβΟ0 are studied with the Ο(3686) data samples collected with the Beijing Spectrometer (BESIII). For the first time, the branching fractions of Οc2βKβKΒ―Β―Β―Β―Β―, Οc2βaΒ±2(1320)Οβ/a02(1320)Ο0 and Οc2βΟ(770)Β±Οβ are measured. Here KβKΒ―Β―Β―Β―Β― denotes both KβΒ±Kβ and Kβ0KΒ―Β―Β―Β―Β―0+c.c., and Kβ denotes the resonances Kβ(892), Kβ2(1430) and Kβ3(1780). The observations indicate a strong violation of the helicity selection rule in Οc2 decays into vector and pseudoscalar meson pairs. The measured branching fractions of Οc2βKβ(892)KΒ―Β―Β―Β―Β― are more than 10 times larger than the upper limit of Οc2βΟ(770)Β±Οβ, which is so far the first direct observation of a significant U-spin symmetry breaking effect in charmonium decays.
The decays of Οc2βK+KβΟ0, KSKΒ±Οβ and Ο+ΟβΟ0 are studied with the Ο(3686) data samples collected with the Beijing Spectrometer (BESIII). For the first time, the branching fractions of Οc2βKβKΒ―Β―Β―Β―Β―, Οc2βaΒ±2(1320)Οβ/a02(1320)Ο0 and Οc2βΟ(770)Β±Οβ are measured. Here KβKΒ―Β―Β―Β―Β― denotes both KβΒ±Kβ and Kβ0KΒ―Β―Β―Β―Β―0+c.c., and Kβ denotes the resonances Kβ(892), Kβ2(1430) and Kβ3(1780). The observations indicate a strong violation of the helicity selection rule in Οc2 decays into vector and pseudoscalar meson pairs. The measured branching fractions of Οc2βKβ(892)KΒ―Β―Β―Β―Β― are more than 20 times larger than that of Οc2βΟ(770)Β±Οβ, which implies the effects are largely due to U-spin symmetry breaking, rather than just isospin symmetry breaking in charmonium decays.
The decays of Οc2βK+KβΟ0, KSKΒ±Οβ and Ο+ΟβΟ0 are studied with the Ο(3686) data samples collected with the Beijing Spectrometer (BESIII). For the first time, the branching fractions of Οc2βKβKΒ―Β―Β―Β―Β―, Οc2βaΒ±2(1320)Οβ/a02(1320)Ο0 and Οc2βΟ(770)Β±Οβ are measured. Here KβKΒ―Β―Β―Β―Β― denotes both KβΒ±Kβ and Kβ0KΒ―Β―Β―Β―Β―0+c.c., and Kβ denotes the resonances Kβ(892), Kβ2(1430) and Kβ3(1780). The observations indicate a strong violation of the helicity selection rule in Οc2 decays into vector and pseudoscalar meson pairs. The measured branching fractions of Οc2βKβ(892)KΒ―Β―Β―Β―Β― are more than 20 times larger than that of Οc2βΟ(770)Β±Οβ, which implies the effects are largely due to U-spin symmetry breaking, rather than just isospin symmetry breaking in charmonium decays.
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.
Using an π+β’πβ collision data sample of 2.93ββfbβ1 collected at a center-of-mass energy of 3.773 GeV by the BESIII detector at BEPCII, we report the observation of π·0βπ0β’(980)ββ’π+β’ππ and evidence for π·+βπ0β’(980)0β’π+β’ππ with significances of 6.4β’π and 2.9β’π, respectively. The absolute branching fractions are determined to be β¬β‘(π·0βπ0β’(980)ββ’π+β’ππ)Γβ¬β‘(π0β’(980)ββπβ’πβ) = [1.3β’3+0.33β0.29β’(stat)Β±0.09β’(syst)]Γ10β4 and β¬β‘(π·+βπ0β’(980)0β’π+β’ππ)Γβ¬β‘(π0β’(980)0βπβ’π0)=[1.6β’6+0.81
β0.66β’(stat)Β±0.11β’(syst)]Γ10β4. This is the first time the π0β‘(980) meson has been measured in a π·0 semileptonic decay, which would open one more interesting page in the investigation of the nature of the puzzling π0β‘(980) states.
By analyzing e+eβ annihilation da ta corresponding to an integrated luminosity of 2.93 fbβ1 collected at a center-of-mass energy of 3.773 GeV with the \text{BESIII} detector, the first observation of the semileptonic decays D0βK0SΟβΟ0e+Ξ½e and D+βK0SΟ+Οβe+Ξ½e is reported. With a dominant hadronic contribution from K1(1270), the branching fractions are measured to be B(D0βK1(1270)β(βK0SΟβΟ0)e+Ξ½e) = (1.69+0.53β0.46Β±0.15)Γ10β4 and B(D+βKΒ―1(1270)0(βK0SΟ+Οβ)e+Ξ½e) = (1.47+0.45β0.40Β±0.20)Γ10β4 with statistical significance of 5.4Ο and 5.6Ο, respectively. When combined with measurements of the K1(1270)βK+ΟβΟ decays, the absolute branching fractions are determined to be B(D0βK1(1270)βe+Ξ½e) = (1.05+0.33β0.28Β±0.12Β±0.12)Γ10β3 and B(D+βKΒ―1(1270)0e+Ξ½e) = (1.29+0.40β0.35Β±0.18Β±0.15)Γ10β3. The first and second uncertainties are statistical and systematic, respectively, and the third uncertainties originate from the assumed branching fractions of the K1(1270)βKΟΟ decays.
We report the first observation of the semimuonic decay π·+βπβ’π+β’ππ using an π+β’πβ collision data sample corresponding to an integrated luminosity of 2.93ββfbβ1 collected with the BESIII detector at a center-of-mass energy of 3.773 GeV. The absolute branching fraction of the π·+βπβ’π+β’ππ decay is measured to be β¬π·+βπβ’π+β’ππ=(17.7Β±1.β’8statΒ±1.β’1syst)Γ10β4. Its ratio with the world average value of the branching fraction of the π·+βπβ’π+β’ππ decay probes lepton flavor universality and it is determined to be β¬π·+βπβ’π+β’ππ/β¬PDG π·+βπβ’π+β’ππ=1.05Β±0.14, in agreement with the standard model expectation within one standard deviation.
Cross sections for the process e+eββK0SK0SJ/Ο at center-of-mass energies from 4.128 to 4.950 GeV are measured using data samples with a total integrated luminosity of 21.2 fbβ1 collected by the BESIII detector operating at the BEPCII storage ring. The Y(4230) state is observed in the energy dependence of the e+eββK0SK0SJ/Ο cross section for the first time with a statistical significance of 26.0Ο. In addition, an enhancement around 4.710 GeV, called the Y(4710), is seen with a statistical significance of 4.2Ο. There is no clear structure around 4.484 GeV. Using a fit with a coherent sum of three Breit-Wigner functions, we determine the mass and width of the Y(4230) state to be 4226.9Β±6.6Β±21.9 MeV/c2 and 71.7Β±16.2Β±31.4 MeV, respectively, and the mass and width of the Y(4710) state to be 4704.0Β±52.3Β±69.5 MeV/c2 and 183.2Β±114.0Β±90.8 MeV, respectively, where the first uncertainties are statistical and the second are systematic. In addition, the average Born cross section ratio of e+eββK0SK0SJ/Ο to e+eββK+KβJ/Ο is measured to be 0.388+0.035β0.028Β±0.016, or 0.426+0.038β0.031Β±0.018 if three-body phase space is considered.
Cross sections for the process e+eββK0SK0SJ/Ο at center-of-mass energies from 4.128 to 4.950 GeV are measured using data samples with a total integrated luminosity of 21.2 fbβ1 collected by the BESIII detector operating at the BEPCII storage ring. The Y(4230) state is observed in the energy dependence of the e+eββK0SK0SJ/Ο cross section for the first time with a statistical significance of 26.0Ο. In addition, an enhancement around 4.710 GeV, called the Y(4710), is seen with a statistical significance of 4.2Ο. There is no clear structure around 4.484 GeV. Using a fit with a coherent sum of three Breit-Wigner functions, we determine the mass and width of the Y(4230) state to be 4226.9Β±6.6Β±21.9 MeV/c2 and 71.7Β±16.2Β±31.4 MeV, respectively, and the mass and width of the Y(4710) state to be 4704.0Β±52.3Β±69.5 MeV/c2 and 183.2Β±114.0Β±90.8 MeV, respectively, where the first uncertainties are statistical and the second are systematic. In addition, the average Born cross section ratio of e+eββK0SK0SJ/Ο to e+eββK+KβJ/Ο is measured to be 0.388+0.035β0.028Β±0.016, or 0.426+0.038β0.031Β±0.018 if three-body phase space is considered.
Cross sections for the process e+eββK0SK0SJ/Ο at center-of-mass energies from 4.128 to 4.950 GeV are measured using data samples with a total integrated luminosity of 21.2 fbβ1 collected by the BESIII detector operating at the BEPCII storage ring. The Y(4230) state is observed in the energy dependence of the e+eββK0SK0SJ/Ο cross section for the first time with a statistical significance of 26.0Ο. In addition, an enhancement around 4.710 GeV, called the Y(4710), is seen with a statistical significance of 4.2Ο. There is no clear structure around 4.484 GeV. Using a fit with a coherent sum of three Breit-Wigner functions, we determine the mass and width of the Y(4230) state to be 4226.9Β±6.6Β±21.9 MeV/c2 and 71.7Β±16.2Β±31.4 MeV, respectively, and the mass and width of the Y(4710) state to be 4704.0Β±52.3Β±69.5 MeV/c2 and 183.2Β±114.0Β±90.8 MeV, respectively, where the first uncertainties are statistical and the second are systematic. In addition, the average Born cross section ratio of e+eββK0SK0SJ/Ο to e+eββK+KβJ/Ο is measured to be 0.388+0.035β0.028Β±0.016, or 0.426+0.038β0.031Β±0.018 if three-body phase space is considered.
The cross sections of e+eββK+KβJ/Ο at center-of-mass energies from 4.127 to 4.600~GeV are measured based on 15.6 fbβ1 data collected with the BESIII detector operating at the BEPCII storage ring. Two resonant structures are observed in the line shape of the cross sections. The mass and width of the first structure are measured to be (4225.3Β±2.3Β±21.5) MeV and (72.9Β±6.1Β±30.8)~MeV, respectively. They are consistent with those of the established Y(4230). The second structure is observed for the first time with a statistical significance greater than 8Ο, denoted as Y(4500). Its mass and width are determined to be (4484.7Β±13.3Β±24.1) MeV and (111.1Β±30.1Β±15.2) MeV, respectively. The first presented uncertainties are statistical and the second ones are systematic. The product of the electronic partial width with the decay branching fraction Ξ(Y(4230)βe+eβ)B(Y(4230)βK+KβJ/Ο) is reported.
The cross sections of e+eββK+KβJ/Ο at center-of-mass energies from 4.127 to 4.600 GeV are measured based on 15.6 fbβ1 data collected with the BESIII detector operating at the BEPCII storage ring. Two resonant structures are observed in the line shape of the cross sections. The mass and width of the first structure are measured to be (4225.3 Β± 2.3 Β± 21.5) MeV and (72.9Β±6.1Β±30.8) MeV, respectively. They are consistent with those of the established Y(4230). The second structure is observed for the first time with a statistical significance greater than 8Ο, denoted as Y(4500). Its mass and width are determined to be (4484.7 Β± 13.3 Β± 24.1) MeV and (111.1 Β± 30.1 Β± 15.2) MeV, respectively. The first presented uncertainties are statistical and the second ones are systematic. The product of the electronic partial width with the decay branching fraction Ξ(Y(4230)βe+eβ)B(Y(4230) β K+KβJ/Ο) is reported.
The cross sections of e+eββK+KβJ/Ο at center-of-mass energies from 4.127 to 4.600~GeV are measured based on 15.6 fbβ1 data collected with the BESIII detector operating at the BEPCII storage ring. Two resonant structures are observed in the line shape of the cross sections. The mass and width of the first structure are measured to be (4225.3Β±2.3Β±21.5) MeV and (72.9Β±6.1Β±30.8)~MeV, respectively. They are consistent with those of the established Y(4230). The second structure is observed for the first time with a statistical significance greater than 8Ο, denoted as Y(4500). Its mass and width are determined to be (4484.7Β±13.3Β±24.1) MeV and (111.1Β±30.1Β±15.2) MeV, respectively. The first presented uncertainties are statistical and the second ones are systematic. The product of the electronic partial width with the decay branching fraction Ξ(Y(4230)βe+eβ)B(Y(4230)βK+KβJ/Ο) is reported.
The cross sections of e+eββK+KβJ/Ο at center-of-mass energies from 4.127 to 4.600~GeV are measured based on 15.6 fbβ1 data collected with the BESIII detector operating at the BEPCII storage ring. Two resonant structures are observed in the line shape of the cross sections. The mass and width of the first structure are measured to be (4225.3Β±2.3Β±21.5) MeV and (72.9Β±6.1Β±30.8)~MeV, respectively. They are consistent with those of the established Y(4230). The second structure is observed for the first time with a statistical significance greater than 8Ο, denoted as Y(4500). Its mass and width are determined to be (4484.7Β±13.3Β±24.1) MeV and (111.1Β±30.1Β±15.2) MeV, respectively. The first presented uncertainties are statistical and the second ones are systematic. The product of the electronic partial width with the decay branching fraction Ξ(Y(4230)βe+eβ)B(Y(4230)βK+KβJ/Ο) is reported.
The Born cross sections of the process e+eββDβ0DββΟ++c.c. at center-of-mass energies from 4.189 to 4.951 GeV are measured for the first time. The data samples used correspond to an integrated luminosity of 17.9fbβ1 and were collected by the BESIII detector operating at the BEPCII storage ring. Three enhancements around 4.20, 4.47 and 4.67 GeV are visible. The resonances have masses of 4209.6Β±4.7Β±5.9MeV/c2, 4469.1Β±26.2Β±3.6MeV/c2 and 4675.3Β±29.5Β±3.5MeV/c2 and widths of 81.6Β±17.8Β±9.0MeV, 246.3Β±36.7Β±9.4MeV and 218.3Β±72.9Β±9.3MeV, respectively, where the first uncertainties are statistical and the second systematic. The first and third resonances are consistent with the Y(4230) and Y(4660) states, respectively, while the second one is compatible with the Y(4500) observed in the e+eββK+KβJ/Ο process. These three Y states are observed in e+eββDβ0DββΟ++c.c. process for the first time.
Observation of three charmoniumlike states with JPC = 1β»β» in eβΊeβ»β β D*β°D*β»ΟβΊ
(2023)
The Born cross sections of the process e+eββDβ0DββΟ+ at center-of-mass energies from 4.189 to 4.951 GeV are measured for the first time. The data samples used correspond to an integrated luminosity of 17.9fbβ1 and were collected by the BESIII detector operating at the BEPCII storage ring. Three enhancements around 4.20, 4.47 and 4.67 GeV are visible. The resonances have masses of 4209.6Β±4.7Β±5.9MeV/c2, 4469.1Β±26.2Β±3.6MeV/c2 and 4675.3Β±29.5Β±3.5MeV/c2 and widths of 81.6Β±17.8Β±9.0MeV, 246.3Β±36.7Β±9.4MeV, and 218.3Β±72.9Β±9.3MeV, respectively, where the first uncertainties are statistical and the second systematic. The first and third resonances are consistent with the Ο(4230) and Ο(4660) states, respectively, while the second one is compatible with the Ο(4500) observed in the e+eββK+KβJ/Ο process. These three charmoniumlike Ο states are observed in e+eββDβ0DββΟ+ process for the first time.
Observation of three charmoniumlike states with JPC = 1β»β» in eβΊeβ»β β D*β°D*β»ΟβΊ
(2023)
The Born cross sections of the process e+eββDβ0DββΟ+ at center-of-mass energies from 4.189 to 4.951 GeV are measured for the first time. The data samples used correspond to an integrated luminosity of 17.9fbβ1 and were collected by the BESIII detector operating at the BEPCII storage ring. Three enhancements around 4.20, 4.47 and 4.67 GeV are visible. The resonances have masses of 4209.6Β±4.7Β±5.9MeV/c2, 4469.1Β±26.2Β±3.6MeV/c2 and 4675.3Β±29.5Β±3.5MeV/c2 and widths of 81.6Β±17.8Β±9.0MeV, 246.3Β±36.7Β±9.4MeV, and 218.3Β±72.9Β±9.3MeV, respectively, where the first uncertainties are statistical and the second systematic. The first and third resonances are consistent with the Ο(4230) and Ο(4660) states, respectively, while the second one is compatible with the Ο(4500) observed in the e+eββK+KβJ/Ο process. These three charmoniumlike Ο states are observed in e+eββDβ0DββΟ+ process for the first time.
Based on 2.7Γ109 Ο(3686) decays collected with the BESIII detector, the radiative decay Ο(3686)βΞ³2(Ο+Οβ)Ξ· is investigated to measure properties of S- and P-wave charmonium states. The branching fraction of the decay Ξ·c(1S)β2(Ο+Οβ)Ξ·, which is found to have a strong dependence on the interference pattern between Ξ·c(1S) and non-Ξ·c(1S) processes, is measured in both destructive and constructive interference scenarios for the first time. The mass and width of the Ξ·c(1S) are measured to be M=(2984.14Β±0.13Β±0.38) MeV/c2 and Ξ=(28.82Β±0.11Β±0.82) MeV, respectively. Clear signals for the decays of the ΟcJ(J=0,1,2) and the Ξ·c(2S) to 2(Ο+Οβ)Ξ· are also observed for the first time, and the corresponding branching fractions are measured. The ratio of the branching fractions between the Ξ·c(2S) and Ξ·c(1S) decays is significantly lower than the theoretical prediction, which might suggest different dynamics in their 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)βΞ³Ξ·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.