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Institute
The Cabibbo-allowed weak radiative decay Ξ+cβΞ£+Ξ³ has been searched for in a sample of Ξ+cΞΒ―βc pairs produced in e+eβ annihilations, corresponding to an integrated luminosity of 4.5fbβ1 collected with the BESIII detector at center-of-mass energies between 4.60 and 4.70 GeV. No excess of signal above background is observed, and we set an upper limit on the branching fraction of this decay to be B(Ξ+cβΞ£+Ξ³)<4.4Γ10β4 at a confidence level of 90\%, which is in agreement with Standard Model expectations.
Cross sections for the process e+eββK0SK0SJ/Ο at center-of-mass energies from 4.128 to 4.950 GeV are measured using data samples with a total integrated luminosity of 21.2 fbβ1 collected by the BESIII detector operating at the BEPCII storage ring. The Y(4230) state is observed in the energy dependence of the e+eββK0SK0SJ/Ο cross section for the first time with a statistical significance of 26.0Ο. In addition, an enhancement around 4.710 GeV, called the Y(4710), is seen with a statistical significance of 4.2Ο. There is no clear structure around 4.484 GeV. Using a fit with a coherent sum of three Breit-Wigner functions, we determine the mass and width of the Y(4230) state to be 4226.9Β±6.6Β±21.9 MeV/c2 and 71.7Β±16.2Β±31.4 MeV, respectively, and the mass and width of the Y(4710) state to be 4704.0Β±52.3Β±69.5 MeV/c2 and 183.2Β±114.0Β±90.8 MeV, respectively, where the first uncertainties are statistical and the second are systematic. In addition, the average Born cross section ratio of e+eββK0SK0SJ/Ο to e+eββK+KβJ/Ο is measured to be 0.388+0.035β0.028Β±0.016, or 0.426+0.038β0.031Β±0.018 if three-body phase space is considered.
Using 7.33 fbβ1 of e+eβ collision data collected by the BESIII detector at center-of-mass energies between 4.128 and 4.226~GeV, we observe for the first time the decay DΒ±sβΟΟΒ±Ξ· with a statistical significance of 7.6Ο. The measured branching fraction of this decay is (0.54Β±0.12Β±0.04)%, where the first uncertainty is statistical and the second is systematic.
Based on a sample of (10.09Β±0.04)Γ109 J/Ο events collected with the BESIII detector operating at the BEPCII storage ring, a partial wave analysis of the decay J/ΟβΞ³Ξ·Ξ·β² is performed. An isoscalar state with exotic quantum numbers JPC=1β+, denoted as Ξ·1(1855), has been observed for the first time with statistical significance larger than 19Ο. Its mass and width are measured to be (1855Β±9+6β1)~MeV/c2 and (188Β±18+3β8)~MeV, respectively. The product branching fraction B(J/ΟβΞ³Ξ·1(1855)βΞ³Ξ·Ξ·β²) is measured to be (2.70Β±0.41+0.16β0.35)Γ10β6. The first uncertainties are statistical and the second are systematic. In addition, an upper limit on the branching ratio B(f0(1710)βΞ·Ξ·β²)/B(f0(1710)βΟΟ) is determined to be 1.61Γ10β3 at 90\% confidence level, which lends support to the hypothesis that the f0(1710) has a large glueball component.
We study the hadronic decays of Ξ+c to the final states Ξ£+Ξ· and Ξ£+Ξ·β², using an e+eβ annihilation data sample of 567 pbβ1 taken at a center-of-mass energy of 4.6 GeV with the BESIII detector at the BEPCII collider. We find evidence for the decays Ξ+cβΞ£+Ξ· and Ξ£+Ξ·β² with statistical significance of 2.5Ο and 3.2Ο, respectively. Normalizing to the reference decays Ξ+cβΞ£+Ο0 and Ξ£+Ο, we obtain the ratios of the branching fractions B(Ξ+cβΞ£+Ξ·)B(Ξ+cβΞ£+Ο0) and B(Ξ+cβΞ£+Ξ·β²)B(Ξ+cβΞ£+Ο) to be 0.35Β±0.16Β±0.03 and 0.86Β±0.34Β±0.07, respectively. The upper limits at the 90\% confidence level are set to be B(Ξ+cβΞ£+Ξ·)B(Ξ+cβΞ£+Ο0)<0.58 and B(Ξ+cβΞ£+Ξ·β²)B(Ξ+cβΞ£+Ο)<1.2. Using BESIII measurements of the branching fractions of the reference decays, we determine B(Ξ+cβΞ£+Ξ·)=(0.41Β±0.19Β±0.05)% (<0.68%) and B(Ξ+cβΞ£+Ξ·β²)=(1.34Β±0.53Β±0.21)% (<1.9%). Here, the first uncertainties are statistical and the second systematic. The obtained branching fraction of Ξ+cβΞ£+Ξ· is consistent with the previous measurement, and the branching fraction of Ξ+cβΞ£+Ξ·β² is measured for the first time.
Using e+eβ annihilation data corresponding to an integrated luminosity of 6.32 fbβ1 collected at center-of-mass energies between 4.178 GeV and 4.226 GeV with the BESIII detector, we perform the first amplitude analysis of the decay D+sβK0SK+Ο0 and determine the relative branching fractions and phases for intermediate processes. We observe the a0(1710)+, the isovector partner of the f0(1710) and f0(1770) mesons, in its decay to K0SK+ for the first time. In addition, we measure the ratio B(D+sβKΒ―β(892)0K+)B(D+sβKΒ―0Kβ(892)+) to be 2.35+0.42β0.23stat.Β±0.10syst.. Finally, we provide a precision measurement of the absolute branching fraction B(D+sβK0SK+Ο0)=(1.46Β±0.06stat.Β±0.05syst.)%.
We report new measurements of the cross sections for the production of Dbar D final states at the Ο(3770) resonance. Our data sample consists of an integrated luminosity of 2.93 fbβ1 of e+eβ annihilation data produced by the BEPCII collider and collected and analyzed with the BESIII detector. We exclusively reconstruct three D0 and six D+ hadronic decay modes and use the ratio of the yield of fully reconstructed Dbar D events ("double tags") to the yield of all reconstructed D or bar D mesons ("single tags") to determine the number of D0bar D0 and D+Dβ events, benefiting from the cancellation of many systematic uncertainties. Combining these yields with an independent determination of the integrated luminosity of the data sample, we find the cross sections to be Ο(e+eβ β D0bar D0) nb and Ο(e+eβ β D+Dβ) = (2.830 Β± 0.011 Β± 0.026) nb, where the uncertainties are statistical and systematic, respectively.
We study the electromagnetic Dalitz decay π½/πβπ+β’πββ’π and search for dielectron decays of a dark gauge boson (πΎβ²) in π½/πβπΎβ²β’π with the two π decay modes πβπΎβ’πΎ and πβπ+β’πββ’π0 using (1310.6Β±7.0)Γ106ββπ½/π events collected with the BESIII detector. The branching fraction of π½/πβπ+β’πββ’π is measured to be (1.43Β±0.04β’(stat)Β±0.06β’(syst))Γ10β5, with a precision that is improved by a factor of 1.5 over the previous BESIII measurement. The corresponding dielectron invariant mass dependent modulus square of the transition form factor is explored for the first time, and the pole mass is determined to be Ξ=2.84Β±0.11β’(stat)Β±0.08β’(syst)ββGeV/π2. We find no evidence of πΎβ² production and set 90% confidence level upper limits on the product branching fraction β¬β‘(π½/πβπΎβ²β’π)Γβ¬β‘(πΎβ²βπ+β’πβ) as well as the kinetic mixing strength between the standard model photon and πΎβ² in the mass range of 0.01β€ππΎβ²β€2.4ββGeV/π2.
Using a 3.19ββfbβ1 data sample collected at an π+β’πβ center-of-mass energy of πΈcm=4.178ββGeV with the BESIII detector, we measure the branching fraction of the leptonic decay π·+π βπ+β’ππ to be β¬π·+π βπ+β’ππ=(5.49Β±0.1β’6statΒ±0.1β’5syst)Γ10β3. Combining our branching fraction with the masses of the π·+π and π+ and the lifetime of the π·+π , we determine ππ·+π β’|ππβ’π |=246.2Β±3.β’6statΒ±3.β’5systββMeV. Using the πβπ quark mixing matrix element |ππβ’π | determined from a global standard model fit, we evaluate the π·+π decay constant ππ·+π =252.9Β±3.β’7statΒ±3.β’6systββMeV. Alternatively, using the value of ππ·+π calculated by lattice quantum chromodynamics, we find |ππβ’π |=0.985Β±0.01β’4statΒ±0.01β’4syst. These values of β¬π·+π βπ+β’ππ, ππ·+π β’|ππβ’π |, ππ·+π and |ππβ’π | are each the most precise results to date.