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Using a sample of (10.09Β±0.04)Γ109 J/Ο events collected with the BESIII detector, a partial wave analysis of J/ΟβΞ³Ξ·β²Ξ·β² is performed.The masses and widths of the observed resonances and their branching fractions are reported. The main contribution is from J/ΟβΞ³f0(2020) with f0(2020)βΞ·β²Ξ·β², which is found with a significance of greater than 25Ο. The product branching fraction B(J/Ο β Ξ³f0(2020))β
B(f0(2020) β Ξ·β²Ξ·β² is measured to be (2.63Β±0.06(stat.) + 0.31β0.46(syst.))Γ10β4.
Study of the process eβΊeβ»βββΟβ°Οβ°J/Ο and neutral charmoniumlike state Zc(3900)β°
(2020)
Cross sections of the process π+β’πββπ0β’π0β’π½/π at center-of-mass energies between 3.808 and 4.600 GeV are measured with high precision by using 12.4ββfbβ1 of data samples collected with the BESIII detector operating at the BEPCII collider facility. A fit to the measured energy-dependent cross sections confirms the existence of the charmoniumlike state πβ‘(4220). The mass and width of the πβ‘(4220) are determined to be (4220.4Β±2.4Β±2.3) MeV/π2 and (46.2Β±4.7Β±2.1)ββMeV, respectively, where the first uncertainties are statistical and the second systematic. The mass and width are consistent with those measured in the process π+β’πββπ+β’πββ’π½/π. The neutral charmonium-like state ππβ’(3900)0 is observed prominently in the π0β’π½/π invariant-mass spectrum, and, for the first time, an amplitude analysis is performed to study its properties. The spin-parity of ππβ’(3900)0 is determined to be π½π=1+, and the pole position is (3893.1Β±2.2Β±3.0)βπβ’(22.2Β±2.6Β±7.0)ββMeV/π2, which is consistent with previous studies of electrically charged ππβ’(3900)Β±. In addition, cross sections of π+β’πβ β π0β’ππβ’(3900)0 β π0β’π0β’π½/π are extracted, and the corresponding line shape is found to agree with that of the πβ‘(4220).
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.
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.
We report a study of the processes of π+β’πββπΎ+β’π·βπ β’π·*0 and πΎ+β’π·*βπ β’π·0 based on π+β’πβ annihilation samples collected with the BESIII detector operating at BEPCII at five center-of-mass energies ranging from 4.628 to 4.698 GeV with a total integrated luminosity of 3.7ββfbβ1. An excess of events over the known contributions of the conventional charmed mesons is observed near the π·βπ β’π·*0 and π·*βπ β’π·0 mass thresholds in the πΎ+ recoil-mass spectrum for events collected at βπ =4.681ββGeV. The structure matches a mass-dependent-width Breit-Wigner line shape, whose pole mass and width are determined as (3982.5+1.8
β2.6Β±2.1)ββMeV/π2 and (12.8+5.3β4.4Β±3.0)ββMeV, respectively. The first uncertainties are statistical and the second are systematic. The significance of the resonance hypothesis is estimated to be 5.3ββπ over the contributions only from the conventional charmed mesons. This is the first candidate for a charged hidden-charm tetraquark with strangeness, decaying into π·βπ β’π·*0 and π·*βπ β’π·0. However, the properties of the excess need further exploration with more statistics.
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.
The quantum entangled J/ΟβΞ£+Σ¯β pairs from (1.0087Β±0.0044)Γ1010 J/Ο events taken by the BESIII detector are used to study the non-leptonic two-body weak decays Ξ£+βnΟ+ and Σ¯ββnΒ―Οβ. The CP-odd weak decay parameters of the decays Ξ£+βnΟ+ (Ξ±+) and Σ¯ββnΒ―Οβ (Ξ±Β―β) are determined to be β0.0565Β±0.0047statΒ±0.0022syst and 0.0481Β±0.0031statΒ±0.0019syst, respectively. The decay parameter Ξ±Β―β is measured for the first time, and the accuracy of Ξ±+ is improved by a factor of four compared to the previous results. The simultaneously determined decay parameters allow the first precision CP symmetry test for any hyperon decay with a neutron in the final state with the measurement of ACP=(Ξ±++Ξ±Β―β)/(Ξ±+βΞ±Β―β) = β0.080Β±0.052statΒ±0.028syst. Assuming CP conservation, the average decay parameter is determined as β¨Ξ±+β©=(Ξ±+βΞ±Β―β)/2 = β0.0506Β±0.0026statΒ±0.0019syst, while the ratios Ξ±+/Ξ±0 and Ξ±Β―β/Ξ±Β―0 are β0.0490Β±0.0032statΒ±0.0021syst and β0.0571Β±0.0053statΒ±0.0032syst, where Ξ±0 and Ξ±Β―0 are the decay parameters of the decays Ξ£+βpΟ0 and Σ¯ββpΒ―Ο0, respectively.
Amplitude analysis and branching fraction measurement of the decay DβΊ β Kββ°ΟβΊΟβ°Οβ°
(2023)
Using 2.93 fbβ1 of e+eβ collision data collected with the BESIII detector at the center-of-mass energy 3.773 GeV, we perform the first amplitude analysis of the decay D+ β Ο+Ο0Ο0 and determine the relative magnitudes and phases of different intermediate processes. The absolute branching fraction of D+ β Ο+Ο0Ο0 is measured to be (2.888 Β± 0.058stat. Β± 0.069syst.)%. The dominant intermediate processes are D+ β a1(1260)+(β Ο+Ο0) and D+ β *0Ο+, with branching fractions of (8.66 Β± 1.04stat. Β± 1.39syst.) Γ 10β3 and (9.70 Β± 0.81stat. Β± 0.53syst.) Γ 10β3, respectively.
The Born cross sections for the process e+eββΟΞ·β² are measured at 22 center-of-mass energies from 2.000 to 3.080 GeV using data collected with the BESIII detector at the BEPCII collider. A resonant structure is observed with a statistical significance of 9.6Ο. A Breit-Wigner fit determines its mass to be MR=(2153Β±30Β±31) MeV/c2 and its width to be ΞR=(167Β±77Β±7) MeV, where the first uncertainties are statistical and the second are systematic.
The quantum entangled J=Ο β ΣþΣ¯ β pairs from Γ°1.0087 0.0044Γ Γ 1010 J=Ο events taken by the BESIII detector are used to study the nonleptonic two-body weak decays Σþ β nΟΓΎ and Σ¯ β β nΒ―Οβ. The CP-odd weak decay parameters of the decays Σþ β nΟΓΎ (Ξ±ΓΎ) and Σ¯ β β nΒ―Οβ (Ξ±Β―β) are determined to be 0.0481 0.0031stat 0.0019syst and β0.0565 0.0047stat 0.0022syst, respectively. The decay parameter Ξ±Β―β is measured for the first time, and the accuracy of Ξ±ΓΎ is improved by a factor of 4 compared to the previous results. The simultaneously determined decay parameters allow the first precision CP symmetry test for any hyperon decay with a neutron in the final state with the measurement of ACP ΒΌ ðαþ ΓΎ Ξ±Β―βΓ=ðαþ β Ξ±Β―βΓ ΒΌ β0.080 0.052stat 0.028syst. Assuming CP conservation, the average decay parameter is determined as hΞ±ΓΎi¼ðαþ β Ξ±Β―βΓ=2 ΒΌ β0.0506 0.0026stat 0.0019syst, while the ratios Ξ±ΓΎ=Ξ±0 and Ξ±Β―β=Ξ±Β― 0 are β0.0490 0.0032stat 0.0021syst and β0.0571 0.0053stat 0.0032syst, where Ξ±0 and Ξ±Β― 0 are the decay parameters of the decays Σþ β pΟ0 and Σ¯ β β pΒ― Ο0, respectively.
Quantum-correlated π·β’Β―π· pairs collected by the BESIII experiment at the πβ‘(3770) resonance corresponding to an integrated luminosity of 2.93ββfbβ1 are used to study the π·0βπΎ0πβ’π+β’πββ’π0 decay mode. The πΆβ’π-even fraction of π·0βπΎ0πβ’π+β’πββ’π0 decays is determined to be 0.235Β±0.010Β±0.002, where the first uncertainty is statistical and the second is systematic.
We measured the Born cross sections for the process e+eβ β ΟΞ·β² at 22 center-of-mass energies from 2.000 to 3.080 GeV with the BESIII detector at the BEPCII collider. We observed a resonant structure with a statistical significance of 9.6Ο. A Breit-Wigner fit determines its mass to be MR = (2153 Β± 30 Β± 31) MeV/c2 and its width to be ΞR = (167 Β± 77 Β± 7) MeV, where the first uncertainties are statistical and the second are systematic.
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.
Using π+β’πβ collision data with an integrated luminosity of 7.33ββfbβ1 collected at center-of-mass energies between 4.128 and 4.226 GeV with the BESIII detector operating at the BEPCII collider, the branching fraction of the leptonic decay π·+ π βπ+β’ππ is measured to be (0.5294Β±0.010β’8statΒ±0.008β’5syst)%. Based on this, the product of the π·+ π decay constant ππ·+ π and the magnitude of the πβπ quark mixing matrix element |ππβ’π | is determined to be ππ·+ π β’|ππβ’π | = 241.8Β±2.5statΒ±2.2systββMeV. Using the value of |ππβ’π | given by the global standard model fit, ππ·+ π is found to be 248.4Β±2.5statΒ±2.2systβMeV. Alternatively, using the value of ππ·+ π from a recent lattice quantum chromodynamics calculation, |ππβ’π | is determined to be 0.968Β±0.01β’0statΒ±0.00β’9syst.
Using 2.93ββfbβ1 of π+β’πβ annihilation data collected at a center-of-mass energy βπ =3.773ββGeV with the BESIII detector operating at the BEPCII collider, we search for the semileptonic π·0β’(+) decays into a π1β’(1235)β(0) axial-vector meson for the first time. No significant signal is observed for either charge combination. The upper limits on the product branching fractions are β¬π·0βπ1β’(1235)ββ’π+β’ππΒ·β¬π1β’(1235) ββ πβ’πβ<1.12Γ10β4 and β¬π·+βπ1β’(1235)0β’π+β’ππΒ·β¬π1β’(1235)0βπβ’π0<1.75Γ10β4 at the 90% confidence level.
We report an amplitude analysis and branching fraction measurement of π·+
π βπΎ+β’πΎββ’π+ decay using a data sample of 3.19ββfbβ1 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 πΎ+β’πΎβ mass region to determine the πΎ+β’πΎβ S-wave line shape, followed by an amplitude analysis of our very pure high-statistics sample. With the detection efficiency based on the amplitude analysis results, the absolute branching fraction is measured to be β¬β‘(π·+π βπΎ+β’πΎββ’π+)=(5.47Β±0.0β’8statΒ±0.1β’3sys)%.
Using 2.93ββfbβ1 of π+β’πβ collision data collected at a center-of-mass energy of 3.773 GeV with the BESIII detector, the first observation of the doubly Cabibbo-suppressed decay π·+βπΎ+β’π+β’πββ’π0 is reported. After removing decays that contain narrow intermediate resonances, including π·+βπΎ+β’π, π·+βπΎ+β’π, and π·+βπΎ+β’π, the branching fraction of the decay π·+βπΎ+β’π+β’πββ’π0 is measured to be (1.13Β±0.0β’8statΒ±0.0β’3syst)Γ10β3. The ratio of branching fractions of π·+βπΎ+β’π+β’πββ’π0 over π·+βπΎββ’π+β’π+β’π0 is found to be (1.81Β±0.15)%, which corresponds to (6.28Β±0.52)β’tan4β‘ππΆ, where ππΆ is the Cabibbo mixing angle. This ratio is significantly larger than the corresponding ratios for other doubly Cabibbo-suppressed decays. The asymmetry of the branching fractions of charge-conjugated decays π·Β±βπΎΒ±β’πΒ±β’πββ’π0 is also determined, and no evidence for πΆβ’π violation is found. In addition, the first evidence for the π·+βπΎ+β’π decay, with a statistical significance of 3.3β’π, is presented and the branching fraction is measured to be β¬β‘(π·+βπΎ+β’π) = (5.β’7+2.5β2.1statΒ±0.β’2syst)Γ10β5.
By analyzing a data sample corresponding to an integrated luminosity of 2.93ββfbβ1 collected at a center-of-mass energy of 3.773 GeV with By analyzing a data sample corresponding to an integrated luminosity of 2.93ββfbβ1 collected at a center-of-mass energy of 3.773 GeV with the BESIII detector, we measure for the first time the absolute branching fraction of the π·+βπβ’π+β’ππ decay to be β¬π·+βπβ’π+β’ππ=(10.4Β±1.β’0statΒ±0.β’5syst)Γ10β4. Using the world averaged value of β¬π·+βπβ’π+β’ππ, the ratio of the two branching fractions is determined to be β¬π·+βπβ’π+β’ππ/β¬π·+βπβ’π+β’ππ=0.91Β±0.13(stat+syst), which agrees with the theoretical expectation of lepton flavor universality within uncertainty. By studying the differential decay rates in five four-momentum transfer intervals, we obtain the product of the hadronic form factor ππ+β‘(0) and the πβπ Cabibbo-Kobayashi-Maskawa matrix element |ππβ’π| to be ππ+β‘(0)β’|ππβ’π|=0.087Β±0.00β’8statΒ±0.00β’2syst. Taking the input of |ππβ’π| from the global fit in the standard model, we determine ππ+β‘(0)=0.39Β±0.0β’4statΒ±0.0β’1syst. On the other hand, using the value of ππ+β‘(0) calculated in theory, we find |ππβ’π| = 0.242Β±0.02β’2statΒ±0.00β’6systΒ±0.03β’3theory.
Study of the process eβΊeβ»βββΟβ°Οβ°J/Ο and neutral charmoniumlike state Zc(3900)β°
(2020)
Cross sections of the process π+β’πββπ0β’π0β’π½/π at center-of-mass energies between 3.808 and 4.600 GeV are measured with high precision by using 12.4ββfbβ1 of data samples collected with the BESIII detector operating at the BEPCII collider facility. A fit to the measured energy-dependent cross sections confirms the existence of the charmoniumlike state πβ‘(4220). The mass and width of the πβ‘(4220) are determined to be (4220.4Β±2.4Β±2.3) MeV/π2 and (46.2Β±4.7Β±2.1)ββMeV, respectively, where the first uncertainties are statistical and the second systematic. The mass and width are consistent with those measured in the process π+β’πββπ+β’πββ’π½/π. The neutral charmonium-like state ππβ’(3900)0 is observed prominently in the π0β’π½/π invariant-mass spectrum, and, for the first time, an amplitude analysis is performed to study its properties. The spin-parity of ππβ’(3900)0 is determined to be π½π=1+, and the pole position is (3893.1Β±2.2Β±3.0)βπβ’(22.2Β±2.6Β±7.0)ββMeV/π2, which is consistent with previous studies of electrically charged ππβ’(3900)Β±. In addition, cross sections of π+β’πβ β π0β’ππβ’(3900)0 β π0β’π0β’π½/π are extracted, and the corresponding line shape is found to agree with that of the πβ‘(4220).
The processes π+β’πββπ·+ π β’π·π β’1β’(2460)β+c.c. and π+β’πββπ·*+ π β’π·π β’1β’(2460)β+c.c. are studied for the first time using data samples collected with the BESIII detector at the BEPCII collider. The Born cross sections of π+β’πββπ·+ π β’π·π β’1β’(2460)β+c.c. at nine center-of-mass energies between 4.467 GeV and 4.600 GeV and those of π+β’πββπ·*+ π β’π·π β’1β’(2460)β+c.c. at βπ =4.590ββGeV and 4.600 GeV are measured. No obvious charmonium or charmoniumlike structure is seen in the measured cross sections.