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The Ξ0 asymmetry parameters are measured using entangled quantum Ξ0 β ΞΒ― 0 pairs from a sample of Γ°448.1 2.9Γ Γ 106 ΟΓ°3686Γ events collected with the BESIII detector at BEPCII. The relative phase between the transition amplitudes of the Ξ0ΞΒ― 0 helicity states is measured to be ΞΞ¦ ΒΌ β0.050 0.150 0.020 rad, which implies that there is no obvious polarization at the current level of statistics. The decay parameters of the Ξ0 hyperon ðαΞ0 ; Ξ±ΞΒ― 0 ; ΟΞ0 ; ΟΞΒ― 0 Γ and the angular distribution parameter Β½Ξ±ΟΓ°3686Γ and ΞΞ¦ are measured simultaneously for the first time. In addition, the CP asymmetry observables are determined to be AΞ0 CP ΒΌ ðαΞ0 ΓΎ Ξ±ΞΒ― 0 Γ=ðαΞ0 β Ξ±ΞΒ― 0 Γ ΒΌ β0.007 0.082 0.025 and ΞΟΞ0 CP ΒΌ Γ°ΟΞ0 ΓΎ ΟΞΒ― 0 Γ=2 ΒΌ β0.079 0.082 0.010 rad, which are consistent with CP conservation.
We report a search for a heavier partner of the recently observed Zcs(3985)β state, denoted as Zβ²βcs, in the process e+eββK+DββsDβ0+c.c., based on e+eβ collision data collected at the center-of-mass energies of sβ=4.661, 4.682 and 4.699 GeV with the BESIII detector. The Zβ²βcs is of interest as it is expected to be a candidate for a hidden-charm and open-strange tetraquark. A partial-reconstruction technique is used to isolate K+ recoil-mass spectra, which are probed for a potential contribution from Zβ²βcsβDββsDβ0 (c.c.). We find an excess of Zβ²βcsβDββsDβ0 (c.c.) candidates with a significance of 2.9Ο, after considering systematic uncertainties, at a mass of (4123.5Β±0.7stat.Β±1.1syst.)MeV/c2. As the data set is limited in size, the upper limits are evaluated at the 90% confidence level on the product of the Born cross section and the branching fraction of Zβ²βcsβDββsDβ0, ΟBornβ
B at the three energy points, under different assumptions of the Zβ²βcs mass from 4.120 to 4.140 MeV and of the width from 10 to 50 MeV. Under various mass and width assumptions, the upper limits of ΟBornβ
B are found to lie in the range of 2βΌ6, 3βΌ7 and 3βΌ6 pb at sβ=4.661, 4.682 and 4.699 GeV, respectively. The larger data samples that will be collected in the coming years will allow a clearer picture to emerge concerning the existence and nature of the Zβ²βcs state.
We search for an axion-like particle (ALP) a through the process Ο(3686)βΟ+ΟβJ/Ο, J/ΟβΞ³a, aβΞ³Ξ³ in a data sample of (2.71Β±0.01)Γ109 Ο(3686) events collected by the BESIII detector. No significant ALP signal is observed over the expected background, and the upper limits on the branching fraction of the decay J/ΟβΞ³a and the ALP-photon coupling constant gaΞ³Ξ³ are set at 95% confidence level in the mass range of 0.165β€maβ€2.84GeV/c2. The limits on B(J/ΟβΞ³a) range from 8.3Γ10β8 to 1.8Γ10β6 over the search region, and the constraints on the ALP-photon coupling are the most stringent to date for 0.165β€maβ€1.468GeV/c2.
We search for an axion-like particle (ALP) a through the process Ο(3686)βΟ+ΟβJ/Ο, J/ΟβΞ³a, aβΞ³Ξ³ in a data sample of (2.71Β±0.01)Γ109 Ο(3686) events collected by the BESIII detector. No significant ALP signal is observed over the expected background, and the upper limits on the branching fraction of the decay J/ΟβΞ³a and the ALP-photon coupling constant gaΞ³Ξ³ are set at 95% confidence level in the mass range of 0.165β€maβ€2.84GeV/c2. The limits on B(J/ΟβΞ³a) range from 8.3Γ10β8 to 1.8Γ10β6 over the search region, and the constraints on the ALP-photon coupling are the most stringent to date for 0.165β€maβ€1.468GeV/c2.
Search for hidden-charm tetraquark with strangeness in eβΊeβ» β KβΊD*β»β D*β° + c.c.
(2023)
We report a search for a heavier partner of the recently observed Zcs(3985)β state, denoted as Zβ²βcs, in the process e+eββK+DββsDβ0+c.c., based on e+eβ collision data collected at the center-of-mass energies of sβ=4.661, 4.682 and 4.699 GeV with the BESIII detector. The Zβ²βcs is of interest as it is expected to be a candidate for a hidden-charm and open-strange tetraquark. A partial-reconstruction technique is used to isolate K+ recoil-mass spectra, which are probed for a potential contribution from Zβ²βcsβDββsDβ0 (c.c.). We find an excess of Zβ²βcsβDββsDβ0 (c.c.) candidates with a significance of 2.1Ο, after considering systematic uncertainties, at a mass of (4123.5Β±0.7stat.Β±4.7syst.) MeV/c2. As the data set is limited in size, the upper limits are evaluated at the 90\% confidence level on the product of the Born cross sections (ΟBorn) and the branching fraction (B) of Zβ²βcsβDββsDβ0, under different assumptions of the Zβ²βcs mass from 4.120 to 4.140 MeV and of the width from 10 to 50 MeV at the three center-of-mass energies. The upper limits of ΟBornβ
B are found to be at the level of O(1) pb at each energy. Larger data samples are needed to confirm the Zβ²βcs state and clarify its nature in the coming years.
Search for hidden-charm tetraquark with strangeness in eβΊeβ» β KβΊD*β»β D*β° + c.c.
(2022)
We report a search for a heavier partner of the recently observed Zcs(3985)β state, denoted as Zβ²βcs, in the process e+eββK+DββsDβ0+c.c., based on e+eβ collision data collected at the center-of-mass energies of sβ=4.661, 4.682 and 4.699 GeV with the BESIII detector. The Zβ²βcs is of interest as it is expected to be a candidate for a hidden-charm and open-strange tetraquark. A partial-reconstruction technique is used to isolate K+ recoil-mass spectra, which are probed for a potential contribution from Zβ²βcsβDββsDβ0 (c.c.). We find an excess of Zβ²βcsβDββsDβ0 (c.c.) candidates with a significance of 2.1Ο, after considering systematic uncertainties, at a mass of (4123.5Β±0.7stat.Β±4.7syst.) MeV/c2. As the data set is limited in size, the upper limits are evaluated at the 90\% confidence level on the product of the Born cross sections (ΟBorn) and the branching fraction (B) of Zβ²βcsβDββsDβ0, under different assumptions of the Zβ²βcs mass from 4.120 to 4.140 MeV and of the width from 10 to 50 MeV at the three center-of-mass energies. The upper limits of ΟBornβ
B are found to be at the level of O(1) pb at each energy. Larger data samples are needed to confirm the Zβ²βcs state and clarify its nature in the coming years.
We search for an axion-like particle (ALP) a through the process Ο(3686)βΟ+ΟβJ/Ο, J/ΟβΞ³a, aβΞ³Ξ³ in a data sample of (2.71Β±0.01)Γ109 Ο(3686) events collected by the BESIII detector. No significant ALP signal is observed over the expected background, and the upper limits on the branching fraction of the decay J/ΟβΞ³a and the ALP-photon coupling constant gaΞ³Ξ³ are set at 95% confidence level in the mass range of 0.165β€maβ€2.84GeV/c2. The limits on B(J/ΟβΞ³a) range from 8.3Γ10β8 to 1.8Γ10β6 over the search region, and the constraints on the ALP-photon coupling are the most stringent to date for 0.165 β€ ma β€ 1.468GeV/c2.
We report a search for a dark photon using 14.9~fbβ1 of e+eβ annihilation data taken at center-of-mass energies from 4.13 to 4.60~GeV with the BESIII detector operated at the BEPCII storage ring. The dark photon is assumed to be produced in the radiative annihilation process of e+eβ and to predominantly decay into light dark matter particles, which escape from the detector undetected. The mass range from 1.5 to 2.9~GeV is scanned for the dark photon candidate, and no significant signal is observed. The mass dependent upper limits at the 90% confidence level on the coupling strength parameter Ο΅ for a dark photon coupling with an ordinary photon vary between 1.6Γ10β3 and 5.7Γ10β3.
Observation of the decay Ο(3686) β Ξ£β»Ξ£βΎβΊ and measurement of its angular distribution
(2022)
Using (448.1Β±2.9)Γ106 Ο(3686) events collected with the BESIII detector at the BEPCII collider, the decay Ο(3686)βΞ£βΣ¯+ is observed for the first time with a branching fraction of (2.84Β±0.04stat.Β±0.08syst.)Γ10β4, and the angular parameter Ξ±Ξ£β is measured to be 0.96Β±0.09stat.Β±0.03syst..
Observation of the decay Ο(3686) β Ξ£β»Ξ£βΎβΊ and measurement of its angular distribution
(2022)
Using (448.1Β±2.9)Γ106 Ο(3686) events collected with the BESIII detector at the BEPCII collider, the decay Ο(3686)βΞ£βΣ¯+ is observed for the first time with a branching fraction of (2.82Β±0.04stat.Β±0.08syst.)Γ10β4, and the angular parameter Ξ±Ξ£β is measured to be 0.96Β±0.09stat.Β±0.03syst..
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.