Using 2.93 fb −1 of e+e− 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 ...D0(+) decays to exclusive final states with an η , e.g., D0 → K−π+η , K0Sπ0η , K+K−η , K0SK0Sη, K−π+π0η , K0Sπ+π−η , K0Sπ0π0η , and π+π−π0η ; D+ → K0Sπ+η,K0SK+η, K−π+π+η, K0Sπ+π0η, π+π+π−η , and π+π0π0η. Among these decays, the D0 → K−π+η and D+→K0Sπ+η decays have the largest branching fractions, which are B (D0 → K−π+η) = ( 1.853 ± 0.02 5 stat ± 0.03 1 syst ) % and B ( D+ → K0Sπ+η ) = ( 1.309 ± 0.03 7 stat ± 0.03 1 syst ) % , respectively. The charge-parity asymmetries for the six decays with highest event yields are determined, and no statistically significant charge-parity violation is found.
Full text
Available for:
CMK, CTK, FMFMET, IJS, NUK, PNG, UL, UM
This paper reports the study of D+s→τ+ν via τ+→π+¯ντ using a boosted decision tree method, with 7.33 fb−1 of e+e− collision data collected by the BESIII detector at center-of-mass energies between ...4.128 and 4.226 GeV. The branching fraction of D+s→τ+ντ is determined to be (5.44±0.17stat±0.13syst)%. The product of the D+s decay constant fD+s and the Cabibbo-Kobayashi-Maskawa matrix element |Vcs| is fD+s|Vcs|=(248.3±3.9stat±3.1syst±1.0input) MeV. Combining with the |Vcs| value obtained from the Standard Model global fit or the fD+s from the lattice quantum chromodynamics, we determine |Vcs|=0.993±0.015stat±0.012syst±0.004input and fD+s=(255.0±4.0stat±3.2syst±1.0input) MeV. The first uncertainty is statistical, the second one is systematic and the third one is due to the input parameters, mainly the lifetime of D+s. All results obtained in this work supersede the BESIII previous results based on 6.32 fb−1 of e+e− collision data taken at center-of-mass energies between 4.178 and 4.226 GeV.
Full text
Available for:
CMK, CTK, FMFMET, IJS, NUK, PNG, UM
Based on 4.4 fb -1 of e + e - annihilation data collected at the center-of-mass energies between 4.60 and 4.70 GeV with the BESIII detector at the BEPCII collider, the pure W-boson-exchange decay Λ c ...+ → Ξ 0 K + is studied with a full angular analysis. The corresponding decay asymmetry is measured for the first time to be α Ξ 0 K + = 0.01 ± 0.16(stat) ± 0.03(syst). This result reflects the noninterference effect between the S- and P-wave amplitudes. The phase shift between S- and P-wave amplitudes has two solutions, which are δ p - δ s = -1.55 ± 0.25(stat) ± 0.05(syst) rad or 1.59 ± 0.25(stat) ± 0.05(syst) rad.
Full text
Available for:
CMK, CTK, FMFMET, IJS, NUK, PNG, UL, UM
By analyzing an electron-positron collision data sample corresponding to an integrated luminosity of 2.93 fb(-1) taken at the center-of-mass energy of 3.773 GeV with the BESIII detector, we obtain ...for the first time the absolute branching fractions for seven D-0 and D+ hadronic decay modes and search for the hadronic decay D-0 ->(KSKS0)-K-0 pi(0) with much improved sensitivity. The results are B(D-0 -> KS0 pi 0 pi 0 pi 0)=(7.64 +/- 0.30 +/- 0.29)x10(-3), B(D-0 -> K-pi(+)pi(0)pi(0)pi(0))=(9.54 +/- 0.30 +/- 0.31)x10(-3), B(D-0 -> KS0 pi+pi-pi 0 pi 0)=(12.66 +/- 0.45 +/- 0.43)x10(-3), B(D+-> K-S(0)pi+pi(0)pi(0))=(29.04 +/- 0.62 +/- 0.87)x10(-3), B(D+-> K-S(0)pi+pi+pi-pi(0))=(15.28 +/- 0.57 +/- 0.60)x10(-3), B(D+-> K-S(0)pi+pi(0)pi(0)pi(0))=(5.54 +/- 0.44 +/- 0.32)x10(-3), B(D+-> K-pi+pi+pi(0)pi(0))=(4.95 +/- 0.26 +/- 0.19)x10(-3), and B(D-0 ->(KSKS0)-K-0 pi(0))<1.45x10-4 at the 90% confidence level. Here, the first uncertainties are statistical, and the second ones are systematic. The newly studied decays greatly enrich the knowledge of the D -> <(K)over bar>pi pi pi and D -> (K) over bar pi pi pi pi hadronic decays and open a bridge to access more two-body hadronic D decays containing scalar, vector, axial, and tensor mesons in the charm sector.
Full text
Available for:
CMK, CTK, FMFMET, IJS, NUK, PNG, UM
PDF
