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Institute
By analyzing 4.48Γ108 Ο(3686) events collected with the BESIII detector, we observe the decays ΟcJβnK0SΞΒ―+c.c. (J=0, 1, 2) for the first time, via the radiative transition Ο(3686)βΞ³ΟcJ. The branching fractions are determined to be (6.67Β±0.26statΒ±0.41syst)Γ10β4, (1.71Β±0.12statΒ±0.12syst)Γ10β4, and (3.66Β±0.17statΒ±0.23syst)Γ10β4 for J=0, 1, and 2, respectively.
Using 2.93 fbβ1 of e+eβ collision data collected with the BESIII detector at a center-of-mass energy of 3.773 GeV, we measure the absolute branching fractions of the decays D0βKβe+Ξ½e and D+βKΒ―0e+Ξ½e to be (3.567Β±0.031statΒ±0.025syst)% and (8.68Β±0.14statΒ±0.16syst)%, respectively. Starting with the process e+eββDDΒ―, a new reconstruction method is employed to select events that contain candidates for both DβKΒ―e+Ξ½e and DΒ―βKeβΞ½Β―e decays. The branching fractions reported in this work are consistent within uncertainties with previous BESIII measurements that selected events containing DβKΒ―e+Ξ½e and hadronic DΒ― decays. Combining our results with the lifetimes of the D0 and D+ mesons and the previous BESIII measurements leads to a ratio of the two decay partial widths of ΞΒ―D0βKβe+Ξ½eΞΒ―D+βKΒ―0e+Ξ½e=1.039Β±0.021. This ratio supports isospin symmetry in the D0βKβe+Ξ½e and D+βKΒ―0e+Ξ½e decays within 1.9Ο.
Using 2.93 fbβ1 of e+eβ collision data collected with the BESIII detector at a center-of-mass energy of 3.773~GeV, we measure the absolute branching fractions of the decays D0βKβe+Ξ½e and D+βKΒ―0e+Ξ½e to be (3.574Β±0.031statΒ±0.025syst)% and (8.70Β±0.14statΒ±0.16syst)%, respectively. Starting with the process e+eββDDΒ―, a new reconstruction method is employed to select events that contain candidates for both DβKΒ―e+Ξ½e and DΒ―βKeβΞ½Β―e decays. The branching fractions reported in this work are consistent within uncertainties with previous BESIII measurements that selected events containing DβKΒ―e+Ξ½e and inclusive hadronic DΒ― decays. Combining our results with the lifetimes of the D0 and D+ mesons and the previous BESIII measurements leads to a ratio of the two decay partial widths of ΞΒ―D0βKβe+Ξ½eΞΒ―D+βKΒ―0e+Ξ½e=1.040Β±0.021. This ratio supports isospin symmetry in the D0βKβe+Ξ½e and D+βKΒ―0e+Ξ½e decays within 1.9Ο.
The e+eββΞ³ΟcJ (J=0,1,2) processes are studied at center-of-mass energies ranging from 3.773 to 4.600 GeV, using a total integrated luminosity of 19.3 fbβ1 e+eβ annihilation data accumulated with the BESIII detector at BEPCII. We observe for the first time e+eββΞ³Οc1,c2 signals at sβ= 4.180 GeV with statistical significances of 7.6Ο and 6.0Ο, respectively. The production cross section of e+eββΞ³Οc1,c2 at each center-of-mass energy is also measured. We find that the line shape of the e+eββΞ³Οc1 cross section can be described with conventional charmonium states Ο(3686), Ο(3770), Ο(4040), Ο(4160). Compared with this, for the e+eββΞ³Οc2 channel, one more additional resonance is added to describe the cross section line shape. Its mass and width are measured to be M=4371.7Β±7.5Β±1.8 MeV/c2 and Ξtot=51.1Β±17.6Β±1.9 MeV, where the first uncertainties are statistical and the second systematic. The significance of this resonance is estimated to be 5.8Ο, and its parameters agree with the Y(4360) resonance previously reported in e+eββΟ+ΟβΟ(3686), and the Y(4390) in e+eββΟ+Οβhc within uncertainties. No significant signal for the e+eββΞ³Οc0 process is observed, and the upper limits of Born cross sections ΟB(e+eββΞ³Οc0) at 90\% confidence level are reported.
Using a data sample of 4.481Γ108ββπβ‘(3686) events collected with the BESIII detector, we report the first observation of the four-lepton-decays π½/πβπ+β’πββ’π+β’πβ and π½/πβπ+β’πββ’π+β’πβ utilizing the process πβ‘(3686)βπ+β’πββ’π½/π. The branching fractions are determined to be [5.48Β±0.31β’(stat)Β±0.45β’(syst)]Γ10β5 and [3.53Β±0.22β’(stat)Β±0.13β’(syst)]Γ10β5, respectively. The results are consistent with theoretical predictions. No significant signal is observed for π½/πβπ+β’πββ’π+β’πβ, and an upper limit on the branching fraction is set at 1.6Γ10β6 at the 90% confidence level. A πΆβ’π asymmetry observable is constructed for the first two channels, which is measured to be (β0.012Β±0.054Β±0.010) and (0.062Β±0.059Β±0.006), respectively. No evidence for πΆβ’π violation is observed in this process.
Based on 4.481Γ108 Ο(3686) events collected with the BESIII detector at BEPCII, the branching fraction of the isospin violating decay Ο(3686)βΣ¯0Ξ+c.c. is measured to be (1.60Β±0.31Β±0.13 Β± 0.58)Γ10β6, where the first uncertainty is statistical, the second is systematic, and the third is the uncertainty arising from interference with the continuum. This result is significantly smaller than the measurement based on CLEO-c data sets. The decays ΟcJβΞΞΒ― are measured via Ο(3686)βΞ³ΟcJ, and the branching fractions are determined to be B(Οc0βΞΞΒ―)=(3.64Β±0.10Β±0.10Β±0.07)Γ10β4, B(Οc1βΞΞΒ―)=(1.31Β±0.06Β±0.06Β±0.03)Γ10β4, B(Οc2βΞΞΒ―)=(1.91Β±0.08Β±0.17Β±0.04)Γ10β4, where the third uncertainties are systematic due to the Ο(3686)βΞ³ΟcJ branching fractions.
Using a data sample corresponding to an integrated luminosity of 2.93 fbβ1 collected at a center-of-mass energy sβ=3.773 GeV by the BESIII detector, the decay D0βΟΟ is observed for the first time. The branching fraction is measured to be (6.48Β±0.96Β±0.38)Γ10β4 with a significance of 6.3Ο, where the first and second uncertainties are statistical and systematic, respectively. An angular analysis reveals that the Ο and Ο mesons from the D0βΟΟ decay are transversely polarized, which is inconsistent with current theoretical expectations and challenges our understanding of the underlying dynamics in charm meson decays.
Using a data sample corresponding to an integrated luminosity of 2.93 fbβ1 collected at a center-of-mass energy sβ=3.773 GeV by the BESIII detector, the decay D0βΟΟ is observed for the first time. The branching fraction is measured to be (6.48Β±0.96Β±0.40)Γ10β4 with a significance of 6.3Ο, where the first and second uncertainties are statistical and systematic, respectively. An angular analysis reveals that the Ο and Ο mesons from the D0βΟΟ decay are transversely polarized. The 95% confidence level upper limit on longitudinal polarization fraction is set to be less than 0.24, which is inconsistent with current theoretical expectations and challenges our understanding of the underlying dynamics in charm meson decays.
Using a data sample corresponding to an integrated luminosity of 2.93 fbβ1 collected at a center-of-mass energy sβ=3.773 GeV by the BESIII detector, the decay D0βΟΟ is observed for the first time. The branching fraction is measured to be (6.48Β±0.96Β±0.38)Γ10β4 with a significance of 6.3Ο, where the first and second uncertainties are statistical and systematic, respectively. An angular analysis reveals that the Ο and Ο mesons from the D0βΟΟ decay are transversely polarized.
By analyzing 4.48Γ108 Ο(3686) events collected with the BESIII detector, we observe the decays ΟcJβnK0SΞΒ―+c.c. (J=0, 1, 2) for the first time, via the radiative transition Ο(3686)βΞ³ΟcJ. The branching fractions are determined to be (6.67Β±0.26statΒ±0.41syst)Γ10β4, (1.71Β±0.12statΒ±0.12syst)Γ10β4, and (3.66Β±0.17statΒ±0.23syst)Γ10β4 for J=0, 1, and 2, respectively.
Using a dedicated data sample taken in 2018 on the J/Ο peak, we perform a detailed study of the trigger efficiencies of the BESIII detector. The efficiencies are determined from three representative physics processes, namely Bhabha scattering, dimuon production and generic hadronic events with charged particles. The combined efficiency of all active triggers approaches 100% in most cases, with uncertainties small enough not to affect most physics analyses.
The Born cross sections and effective form factors for process π+β’πββΞββ’Β―Ξ+ are measured at eight center-of-mass energies between 2.644 and 3.080 GeV, using a total integrated luminosity of 363.9ββpbβ1 π+β’πβ collision data collected with the BESIII detector at BEPCII. After performing a fit to the Born cross section of π+β’πββΞββ’Β―Ξ+, no significant threshold effect is observed.
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 a sample of 1.31Γ109ββπ½/π events collected with the BESIII detector, we perform a study of π½/πβπΎβ’πβ’πβ’πβ² to search for the πβ‘(2370) and ππ in the πβ’πβ’πβ² invariant mass distribution. No significant signal for the πβ‘(2370) is observed, and we set an upper limit for the product branching fraction of β¬(π½/πβπΎβ’πβ‘(2370)Β·β¬β‘(πβ‘(2370)βπβ’πβ’πβ²)<9.2Γ10β6 at the 90% confidence level. A clear ππ signal is observed for the first time, yielding a product branching fraction of β¬β‘(π½/πβπΎβ’ππ)Β·β¬β‘(ππβπβ’πβ’πβ²)=(4.86Β±0.62β’(stat)Β±0.45β’(sys))Γ10β5.
By analyzing an e+eβ annihilation data sample with an integrated luminosity of 2.93 fbβ1 taken at the center-of-mass energy of 3.773 GeV with the BESIII detector, we determine the absolute branching fractions of the hadronic decays D0βKβΟ+Ο, D0βK0SΟ0Ο, and D+βK0SΟ+Ο to be (3.392Β±0.044statΒ±0.085syst)%, (0.848Β±0.046statΒ±0.031syst)%, and (0.707Β±0.041statΒ±0.029syst)%, respectively. The accuracy of the branching fraction measurement of the decay D0βKβΟ+Ο is improved by a factor of seven compared to the world average value. The D0βK0SΟ0Ο and D+βK0SΟ+Ο decays are observed for the first time.
The decay π·+π βπ+β’π+β’πββ’π is observed for the first time, using π+β’πβ collision data corresponding to an integrated luminosity of 6.32ββfbβ1, collected by the BESIII detector at center-of-mass energies between 4.178 and 4.226 GeV. The absolute branching fraction for this decay is measured to be β¬β‘(π·+π βπ+β’π+β’πββ’π)=(3.12Β±0.1β’3statΒ±0.0β’9syst)%. The first amplitude analysis of this decay reveals the substructures in π·+π βπ+β’π+β’πββ’π and determines the relative fractions and the phases among these substructures. The dominant intermediate process is π·+π βπ1β’(1260)+β’π,π1β’(1260)+βπβ’(770)0β’π+ with a branching fraction of (1.73Β±0.1β’4statΒ±0.0β’8syst)%. We also observe the π-annihilation process π·+π βπ0β’(980)+β’πβ’(770)0, π0β’(980)+βπ+β’π with a branching fraction of (0.21Β±0.0β’8statΒ±0.0β’5syst)%, which is larger than the branching fractions of other measured pure π-annihilation decays by 1 order of magnitude.
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
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 observed cross sections for π+β’πββπ+β’πβ at energies from 3.8 to 4.6 GeV are measured using data samples taken with the BESIII detector operated at the BEPCII collider. We measure the muonic widths and determine the branching fractions of the charmonium states πβ‘(4040), πβ‘(4160), and πβ‘(4415) decaying to π+β’πβ, as well as making a first determination of the phase of the amplitudes. In addition, we observe evidence for a structure in the dimuon cross section near 4.220ββGeV/π2, which we denote as πβ‘(4220). Analyzing a coherent sum of amplitudes yields eight solutions, one of which gives a mass of ππβ‘(4220) = 4216.7Β±8.9Β±4.1ββMeV/π2, a total width of Ξtot Sβ‘(4220) = 47.2Β±22.8Β±10.5ββMeV, and a muonic width of Ξπβ’π πβ‘(4220) = 1.53Β±1.26Β±0.54ββkeV, where the first uncertainties are statistical and the second systematic. The eight solutions give the central values of the mass, total width, muonic width to be, respectively, in the range from 4212.8 to 4219.4ββMeV/π2, from 36.4 to 49.6 MeV, and from 1.09 to 1.53 keV. The statistical significance of the πβ‘(4220) signal is 3.9β’π. Correcting the total dimuon cross section for radiative effects yields a statistical significance for this structure of 8.1β’π.
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.