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This work aims to differentiate strangeness produced from hard processes (jet-like) and softer processes (underlying event) by measuring the angular correlation between a high-momentum trigger hadron (h) acting as a jet-proxy and a produced strange hadron (Ο(1020) meson). Measuring hβΟ correlations at midrapidity in pβPb collisions at βsNN = 5.02 TeV as a function of event multiplicity provides insight into the microscopic origin of strangeness enhancement in small collision systems. The jet-like and the underlying-event-like strangeness production are investigated as a function of event multiplicity. They are also compared between a lower and higher momentum region. The evolution of the per-trigger yields within the near-side (aligned with the trigger hadron) and away-side (in the opposite direction of the trigger hadron) jet is studied separately, allowing for the characterization of two distinct jet-like production regimes. Furthermore, the hβΟ correlations within the underlying event give access to a production regime dominated by soft production processes, which can be compared directly to the in-jet production. Comparisons between hβΟ and dihadron correlations show that the observed strangeness enhancement is largely driven by the underlying event, where the Ο/h ratio is significantly larger than within the jet regions. As multiplicity increases, the fraction of the total Ο(1020) yield coming from jets decreases compared to the underlying event production, leading to high-multiplicity events being dominated by the increased strangeness production from the underlying event
A search for the charged lepton flavor violating decay π½/πβπΒ±β’πβ with πββπββ’π0β’ππ is performed with about 10Γ109ββπ½/π events collected with the BESIII detector at the BEPCII. No significant signal is observed, and an upper limit is set on the branching fraction β¬β‘(π½/πβπΒ±β’πβ)<7.5Γ10β8 at the 90% confidence level. This improves the previously published limit by two orders of magnitude.
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).
he Born cross sections for the process π+β’πββπβ²β’π+β’πβ at different center-of-mass energies between 2.00 and 3.08 GeV are reported with improved precision from an analysis of data samples collected with the BESIII detector operating at the BEPCII storage ring. An obvious structure is observed in the Born cross section line shape. Fit as a Breit-Wigner resonance, it has a statistical significance of 6.3β’π and a mass and width of π=(2111Β±43Β±25)ββMeV/π2 and Ξ=(135Β±34Β±30)ββMeV, where the uncertainties are statistical and systematic, respectively. These measured resonance parameters agree with the measurements of BABAR in π+β’πββπβ²β’π+β’πβ and BESIII in π+β’πββπβ’π0 within two standard deviations.
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.
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 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 a study of the processes of e+eββK+(DβsDβ0+DββsD0) based on e+eβ 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 3.7 fbβ1. An excess over the known contributions of the conventional charmed mesons is observed near the DβsDβ0 and DββsD0 mass thresholds in the K+ recoil-mass spectrum for events collected at sβ=4.681 GeV. The structure matches a mass-dependent-width Breit-Wigner line shape, whose pole mass and width are determined as (3982.5+1.8β2.6Β±2.1) MeV/c2 and (12.8+5.3β4.4Β±3.0) MeV, respectively. The first uncertainties are statistical and the second are systematic. The significance of the resonance hypothesis is estimated to be 5.3 Ο over the contributions only from the conventional charmed mesons. This is the first candidate of the charged hidden-charm tetraquark with strangeness, decaying into DβsDβ0 and DββsD0. However, the properties of the excess need further exploration with more statistics.
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 data collected with the BESIII detector operating at the Beijing Electron Positron Collider, we search for the process π+β’πββππβ’πβ’π+β’πβ. The search is performed using five large datasets recorded at center-of-mass energies of 4.23, 4.26, 4.36, 4.42, and 4.60 GeV. The ππ meson is reconstructed in 16 exclusive decay modes. No signal is observed in the ππ mass region at any center-of-mass energy. The upper limits on the reaction cross sections are determined to be 6.2, 10.8, 27.6, 22.6 and 23.7 pb at the 90% confidence level at the center-of-mass energies listed above.