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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.
Cross section measurement of eβΊeβ» β ΟβΊΟβ»Ο(3686) from βs = 4.0076 GeV to 4.6984 GeV
(2021)
Using data samples with a total integrated luminosity of 20.1ββfbβ1 collected by the BESIII detector operating at the BEPCII collider, the cross section of the process π+β’πββπ+β’πββ’πβ‘(3686) is measured at center-of-mass energies between 4.0076 and 4.6984 GeV. The measured cross section is consistent with previous results, and with much improved precision. A fit to the measured energy-dependent cross section, which includes three Breit-Wigner functions and a nonresonant contribution, confirms the existence of the charmonium-like states πβ‘(4220), πβ‘(4390), and πβ‘(4660). This is the first observation of the πβ‘(4660) at the BESIII experiment.
Using a total of 5.25 fbβ1 of e+eβ collision data with center-of-mass energies from 4.236 to 4.600 GeV, we report the first observation of the process e+eβ β Ξ·Ο(2S) with a statistical significance of 4.9 standard deviations. The data sets were collected by the BESIII detector operating at the BEPCII storage ring. We measure the yield of events integrated over center-of-mass energies and also present the energy dependence of the measured cross section.
he first measurement of 3ΞH and 3ΞΒ―Β―Β―Β―HΒ―Β―Β―Β― differential production with respect to transverse momentum and centrality in PbβPb collisions at sNNββββ=5.02~TeV is presented. The 3ΞH has been reconstructed via its two-charged-body decay channel, i.e., 3ΞHβ3He+Οβ. A Blast-Wave model fit of the pT-differential spectra of all nuclear species measured by the ALICE collaboration suggests that the 3ΞH kinetic freeze-out surface is consistent with that of other nuclei. The ratio between the integrated yields of 3ΞH and 3He is compared to predictions from the statistical hadronisation model and the coalescence model, with the latter being favoured by the presented measurements.
Ten hadronic final states of the βπ decays are investigated via the process πβ‘(3686)βπ0β’βπ, using a data sample of (448.1Β±2.9)Γ106ββπβ‘(3686) events collected with the BESIII detector. The decay channel βπβπΎ+β’πΎββ’π+β’πββ’π0 is observed for the first time and has a measured significance of 6.0β’π. The corresponding branching fraction is determined to be β¬β‘(βπβπΎ+β’πΎββ’π+β’πββ’π0)=(3.3Β±0.6Β±0.6)Γ10β3 (where the uncertainties are statistical and systematic, respectively). Evidence for the decays βπβπ+β’πββ’π0β’π and βπβπΎ0πβ’πΎΒ±β’πββ’π+β’πβ is found with a significance of 3.6β’π and 3.8β’π, respectively. The corresponding branching fractions (and upper limits) are obtained to be β¬β‘(βπβπ+β’πββ’π0β’π)=(7.2Β±1.8Β±1.3)Γ10β3 (<1.8Γ10β2) and β¬β‘(βπβπΎ0πβ’πΎΒ±β’πββ’π+β’πβ)=(2.8Β±0.9Β±0.5)Γ10β3 (<4.7Γ10β3). Upper limits on the branching fractions for the final states βπβπΎ+β’πΎββ’π0, πΎ+β’πΎββ’π, πΎ+β’πΎββ’π+β’πββ’π, 2β’(πΎ+β’πΎβ)β’π0, πΎ+β’πΎββ’π0β’π, πΎ0πβ’πΎΒ±β’πβ, and πβ’Β―πβ’π0β’π0 are determined at a confidence level of 90%.
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.
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.
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.