Study of the decay D0→K¯0π−e+νe

Abstract

We report a study of the decay D 0 →K 0 π − e þ ν e based on a sample of 2.93 fb −1 e þ e − annihilation data collected at the center-of-mass energy of 3.773 GeV with the BESIII detector at the BEPCII collider. The total branching fraction is determined to be BðD 0 →K 0 π − e þ ν e Þ ¼ ð1.434 AE 0.029ðstat:Þ AE 0.032ðsyst:ÞÞ%, which is the most precise to date. According to a detailed analysis of the involved dynamics, we find this decay is dominated with the K Ã ð892Þ − contribution and present an improved measurement of its branching fraction to be BðD 0 → K Ã ð892Þ − e þ ν e Þ ¼ ð2.033 AE 0.046ðstat:Þ AE 0.047ðsyst:ÞÞ%. We further access their hadronic form-factor ratios for the first time as r V ¼ Vð0Þ=A 1 ð0Þ ¼ 1.46 AE 0.07ðstat:Þ AE 0.02ðsyst:Þ and r 2 ¼ A 2 ð0Þ=A 1 ð0Þ ¼ 0.67 AE 0.06ðstat:Þ AE 0.01ðsyst:Þ. In addition, we observe a significantK 0 π − S-wave component accounting for ð5.51 AE 0.97ðstat:Þ AE 0.62ðsyst:ÞÞ% of the total decay rate.

Semileptonic decays of D and Ds mesons in the relativistic quark model

“…4, agree with experimental data from the BaBar [23] and CLEO [33] Collaborations. The calculated total branching fractions are also in good agreement with averaged experimental values from PDG [1] and recent data from the BES III Collaboration [2][3][4][5][6][7][8][9][10]. To test lepton universality in the semileptonic D (s) meson decays we calculated the ratios of the branching fractions of decays involving muons to the ones involving positrons.…”

“…Good agreement in the whole accessible kinematical range is observed. In Tables V-VII we compare our and previous theoretical predictions [26,27,30] with experimental data from PDG [1] and recent data from BES III [2][3][4][5][6][7][8][9][10] Collaboration. We roughly estimate the uncertainties of our calculations to be within 10%.…”

“…There have been many measurements and calculations of these ratios. In Table IV we compare some of theoretical predictions with averaged experimental data from PDG [1] and recent BES III [2][3][4][5][6][7][8][9][10] measurements. Once again our results agree well with data.…”

“…Recently significant experimental progress has been achieved in studying semileptonic decays of the open charm mesons [1]. More precise and detailed measurements of the absolute and differential branching fractions and form factors for D and D s decays to pseudoscalar and vector mesons became available due to high statistics accumulated at BES III [2][3][4][5][6][7][8][9][10]. Various CKM-favored and suppressed decay modes both with positron and muon were investigated.…”

Model-independent determination of the relative strong-phase difference between D0 and D¯0→KAblikim1, Ачасов2, Adlarson3 et al. 2020Phys. Rev. DSelf Cite301110View full textAdd to dashboardCite

“…For the uncertainty from the integrated yields, the expected yield of peaking background in each phase space region is varied according to a Gaussian distribution. This distribution has the nominal value of the peaking-background yield as the mean, and a width which combines the uncertainties from the BFs of peaking-background decays, and the uncertainties arising from tracking [46], PID [46], and π 0 reconstruction efficiencies [47]. The distributions over the Dalitz plots for peaking backgrounds that are CP eigenstates, or D →…”