Measurement of the absolute branching fraction of D ⁺ → K̅ ⁰ e ⁺ ν _e via K̅ ⁰ → π ⁰ π ^0<

Abstract

49A,49C Y. Ding( ) 27 C. Dong( ) 30 J. Dong( ) 1,a L. Y. Dong( ) 1 M. Y. Dong( ) 1,a Z. L. Dou( ) 29 S. X. Du( ) 53 P. F. Duan( ) 1 J. Z. Fan( ) 39 J. Fang( ) 1,a S. S. Fang( ) 1 X. Fang( ) 46,a Y. Fang( )

Analysis of D+→K¯0e

“…The comparisons of our measured branching fractions for D þ →K 0 e þ ν e and D þ → π 0 e þ ν e decays with those previously measured at the BES-II [14], CLEO [15], and BESIII [16,17] experiments as well as the PDG values [8] are shown in Fig. 4.…”

Observation of the Semileptonic Decay D0→a0(980)−Ablikim1, Ачасов2, Ahmed3 et al. 2018Phys. Rev. Lett.Self Cite361170View full textAdd to dashboardCite

“…The values for the tracking and PID are 1.0% and 0.6%, respectively, obtained after reweighting according to the distributions of momentum and polar angle of the positron from the signal MC sample. Considering the similar selection criteria of η and π 0 , the uncertainty arising from the choice of the best ηπ 0 combination in the D þ decay is studied with a di-π 0 sample of DT D hadronic decay, D 0 → K − π þ π 0 versusD 0 → K þ π − π 0 and is taken as 0.3% [27].…”

Observation of the semimuonic decay D+→ωμ+νμ

“…The same selection criteria as reported in Refs. [11,[33][34][35][36] are used in this analysis. Charged tracks are required to have polar angle (θ) within j cos θj < 0.93, and except for those from K 0 S decays, are required to originate from an interaction region defined by jV xy j < 1 cm and jV z j < 10 cm, where jV xy j and jV z j refer to the distances of closest approach of the reconstructed track to the interaction point in the xy plane and the z direction (along the beam), respectively.…”

“…The uncertainty in the total ST yield, which is mainly from the uncertainty due to the M BC fit of the ST candidates, has been studied in Refs. [11,33,34] and is assigned as 0.5%. The tracking and PID efficiencies of the pion and muon are studied by analyzing the DT hadronic DD events and e þ e − → γμ þ μ − events, respectively.…”

“…The systematic uncertainties associated with the pion tracking (PID), muon tracking (PID) are assigned to be 0.2% (0.3%) and 0.3% (0.3%), respectively. The π 0 efficiency, including effects of photon selection, the 1-C kinematic fit, and the mass window, is studied with DT hadronic DD decays [33,34], and a systematic uncertainty of 0.7% is assigned to each π 0 . The uncertainty of the E max extra γ requirement is estimated to be 4.4% by analyzing the DT DD events of…”