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تسجيل مستخدم جديدObservation of $D^0to K_1(1270)^- e^+ u_e$
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Using 2.93 fb$^{-1}$ of $e^+e^-$ collision data taken with the BESIII detector at a center-of-mass energy of 3.773 $rm ,GeV$, the observation of the $D^0to K_1(1270)^- e^+ u_e$ semileptonic decay is presented. The statistical significance of the decay $D^0to K_1(1270)^- e^+ u_e$ is greater than $10sigma$. The branching fraction of $D^0to K_1(1270)^- e^+ u_e$ is measured to be $(1.09pm0.13^{+0.09}_{-0.16} pm 0.12)times10^{-3}$. Here, the first uncertainty is statistical, the second is systematic, and the third originates from the assumed branching fraction of $K_1(1270)^- rightarrow K^-pi^+pi^-$. The fraction of longitudinal polarization in $D^0to K_1(1270)^- e^+ u_e$ is determined for the first time to be $0.50pm0.19_{rm stat}pm0.08_{rm syst}$.
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We report a sensitive study of measuring $bto sgamma$ photon polarisation in $D^{0}to K_1(1270)^-e^+ u_e$ with an integrated luminosity of $mathcal L$ = 1 ab$^{-1}$ at a center-of-mass energy of 3.773 GeV at future Super Tau Charm Facility. More than
61,000 signals of $D^{0}to K_1(1270)^-e^+ u_e$ are expected. Based on a fast simulation software package, the statistical sensitivity for the ratio of up-down asymmetry is estimated to be $1.5times 10^{-2}$ by performing a two-dimensional angular analysis in $D^{0}to K_1(1270)^-e^+ u_e$. Combining with measurements of up-down asymmetry in $Bto K_1gamma$, the photon polarisation in $bto sgamma$ can be determined model-independently.
Using 2.93 fb$^{-1}$ of $e^+e^-$ collision data collected with the BESIII detector at a center-of-mass energy of 3.773 GeV, we measure the absolute branching fractions of the decays $D^0to K^-e^+ u_e$ and $D^+to bar K^0 e^+ u_e$ to be $(3.567pm0.031_
{rm stat}pm 0.025_{rm syst})%$ and $(8.68pm0.14_{rm stat}pm 0.16_{rm syst})%$, respectively. Starting with the process $e^+e^-to Dbar{D}$, a new reconstruction method is employed to select events that contain candidates for both $Dto bar Ke^+ u_e$ and $bar Dto Ke^-bar u_e$ decays. The branching fractions reported in this work are consistent within uncertainties with previous BESIII measurements that selected events containing $Dto bar Ke^+ u_e$ and hadronic $bar D$ decays. Combining our results with the lifetimes of the $D^0$ and $D^+$ mesons and the previous BESIII measurements leads to a ratio of the two decay partial widths of $frac{bar Gamma_{D^0to K^{-}e^+ u_{e}}}{bar Gamma_{D^{+}to bar K^{0}e^+ u_{e}}}=1.039pm0.021$. This ratio supports isospin symmetry in the $D^0to K^-e^+ u_e$ and $D^+to bar K^0 e^+ u_e$ decays within $1.9sigma$.
Using a data sample corresponding to an integrated luminosity of 2.93~fb$^{-1}$ recorded by the BESIII detector at a center-of-mass energy of $3.773$ GeV, we present an analysis of the decays $bar{D}^0topi^+pi^0 e^-bar{ u}_e$ and $D^+topi^-pi^+ e^+ u
_e$. By performing a partial wave analysis, the $pi^+pi^-$ $S$-wave contribution to $D^+topi^-pi^+ e^+ u_e$ is observed to be $(25.7pm1.6pm1.1)$% with a statistical significance greater than 10$sigma$, besides the dominant $P$-wave contribution. This is the first observation of the $S$-wave contribution. We measure the branching fractions $mathcal{B}(D^{0} to rho^- e^+ u_e) = (1.445pm 0.058 pm 0.039) times10^{-3}$, $mathcal{B}(D^{+} to rho^0 e^+ u_e) = (1.860pm 0.070 pm 0.061) times10^{-3}$, and $mathcal{B}(D^{+} to f_0(500) e^+ u_e, f_0(500)topi^+pi^-) = (6.30pm 0.43 pm 0.32) times10^{-4}$. An upper limit of $mathcal{B}(D^{+} to f_0(980) e^+ u_e, f_0(980)topi^+pi^-) < 2.8 times10^{-5}$ is set at the 90% confidence level. We also obtain the hadronic form factor ratios of $Dto rho e^+ u_e$ at $q^{2}=0$ assuming the single-pole dominance parameterization: $r_{V}=frac{V(0)}{A_{1}(0)}=1.695pm0.083pm0.051$, $r_{2}=frac{A_{2}(0)}{A_{1}(0)}=0.845pm0.056pm0.039$.
By analyzing a 2.93~$rm fb^{-1}$ data sample of $e^+e^-$ collisions, recorded at a center-of-mass energy of 3.773 $rm ,GeV$ with the BESIII detector operated at the BEPCII collider, we have searched for the semileptonic $D^+$ transition into the axia
l-vector meson ${bar{K}}_{1}(1270)^{0}$. The $D^{+} rightarrow {bar{K}}_{1}(1270)^{0}e^{+} u_{e}$ decay is observed for the first time with a statistical significance greater than $10sigma$. Its decay branching fraction is determined to be ${mathcal B}[D^+to bar K_1(1270)^0 e^+ u_e]=(2.30pm0.26pm 0.18 pm 0.25)times10^{-3}$, where the first and second uncertainties are statistical and systematic, respectively, and the third originates from the input branching fraction of ${bar{K}}_{1}(1270)^{0} rightarrow K^{-} pi^{+} pi^{0}$.
Using an $e^+e^-$ collision data sample of 2.93 fb$^{-1}$ collected at a center-of-mass energy of 3.773 GeV by the BESIII detector at BEPCII, we report the observation of $D^0 to a_0(980)^- e^+ u_e$ and evidence for $D^+ to a_0(980)^0 e^+ u_e~$ wit
h significances of $6.4sigma$ and $2.9sigma$, respectively. The absolute branching fractions are determined to be $mathcal{B}(D^0 to a_0(980)^- e^+ u_e)timesmathcal{B}(a_0(980)^- to eta pi^-) = (1.33_{-0.29}^{+0.33}({rm stat})pm0.09({rm syst}))times10^{-4}~$ and $mathcal{B}(D^+ to a_0(980)^0 e^+ u_e)timesmathcal{B}(a_0(980)^0 to eta pi^0) = (1.66_{-0.66}^{+0.81}({rm stat})pm0.11({rm syst}))times10^{-4}~$. An upper limit of $mathcal{B}(D^+ to a_0(980)^0 e^+ u_e)timesmathcal{B}(a_0(980)^0 to eta pi^0)<3.0times10^{-4}~$ is also determined at the $90%~$ confidence level.
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