اشترك بالحزمة الذهبية واحصل على وصول غير محدود شمرا أكاديميا
تسجيل مستخدم جديدMeasurement of the branching fraction for $psi(3770) to gammachi_{c0}$
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By analyzing a data set of 2.92 fb$^{-1}$ of $e^+e^-$ collision data taken at $sqrt s= 3.773~rm GeV$ and 106.41$times 10^{6}$ $psi(3686)$ decays taken at $sqrt s= 3.686~rm GeV$ with the BESIII detector at the BEPCII collider, we measure the branching fraction and the partial decay width for $psi(3770)togammachi_{c0}$ to be ${mathcal B}(psi(3770)togammachi_{c0})=(6.88pm0.28pm0.67)times 10^{-3}$ and $Gamma[psi(3770)togammachi_{c0}]=(187pm8pm19)~rm keV$, respectively. These are the most precise measurements to date.
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Analyzing $(448.1pm2.9)times10^6$ $psi(3686)$ events collected with the BESIII detector at the BEPCII collider, the $psi(3686)to omega K_{S}^{0}K_{S}^{0}$ decay is observed for the first time. The branching fraction for this decay is determined to be
$mathcal{B}_{psi(3686)to omega K_{S}^{0}K^{0}_{S}}$=$(7.04pm0.39pm0.36)$$times10^{-5}$, where the first uncertainty is statistical and the second is systematic.
With $1.06times 10^8$ $psi(3686)$ events collected with the BESIII detector, the branching fraction of $psi(3686) to omega K^+ K^-$ is measured to be $(1.54 pm 0.04 pm 0.11) times 10^{-4}$. This is the most precise result to date, due to the largest
$psi(3686)$ sample, improved signal reconstruction efficiency, good simulation of the detector performance, and a more accurate knowledge of the continuum contribution. Using the branching fraction of $J/psi to omega K^+ K^-$, the ratio $mathcal{B}(psi(3868) to K^+K^-) / mathcal{B}(J/psi to K^+K^-)$ is determined to be $(18.4 pm 3.7),%$. This constitutes a significantly improved test of the $12,%$ rule, with the uncertainty now dominated by the $J/psi$ branching fraction.
We report the final results of a study of the psi(3770) meson using a data sample collected with the KEDR detector at the VEPP-4M electron-positron collider. The data analysis takes into account the interference between the resonant and nonresonant $
Dbar{D}$ production, where the latter is related to the nonresonant part of the energy-dependent form factor $F_D$. The vector dominance approach and several empirical parameterizations have been tried for the nonresonant $F_D^{NR}(s)$. Our results for the mass and total width of psi(3770) are M = 3779.2 ^{+1.8}_{-1.7} ^{+0.5}_{-0.7} ^{+0.3}_{-0.3} MeV, Gamma =24.9 ^{+4.6}_{-4.0} ^{+0.5}_{-0.6} ^{+0.2}_{-0.9} MeV, where the first, second and third uncertainties are statistical, systematic and model, respectively. For the electron partial width two possible solutions have been found: (1) Gamma_{ee} = 154 ^{+79}_{-58} ^{+17}_{-9} ^{+13}_{-25} eV, (2) Gamma_{ee} = 414 ^{+72}_{-80} ^{+24}_{-26} ^{+90}_{-10} eV. Our statistics are insufficient to prefer one solution to another. The solution (2) mitigates the problem of non-$Dbar{D}$ decays but is disfavored by potential models. It is shown that taking into account the resonance--continuum interference in the near-threshold region affects resonance parameters, thus the results presented can not be directly compared with the corresponding PDG values obtained ignoring this effect.
The $B_s^0to J/psi K_S^0$ branching fraction is measured in a data sample corresponding to 0.41$fb^{-1}$ of integrated luminosity collected with the LHCb detector at the LHC. This channel is sensitive to the penguin contributions affecting the sin2$b
eta$ measurement from $B^0to J/psi K_S^0$ The time-integrated branching fraction is measured to be $BF(B_s^0to J/psi K_S^0)=(1.83pm0.28)times10^{-5}$. This is the most precise measurement to date.
We report a measurement of the branching fraction of $psi(3770)togammachi_{c1}$ and search for the transition $psi(3770)rightarrow gamma chi_{c2}$ based on 2.92~fb$^{-1}$ of $e^+e^-$ data accumulated at $sqrt{s}=3.773$~GeV with the BESIII detector at
the BEPCII collider. The measured branching fraction of $psi(3770) rightarrow gamma chi_{c1}$ is $mathcal B(psi(3770) rightarrow gamma chi_{c1})=(2.48 pm 0.15 pm 0.23) times 10^{-3}$, which is the most precise measurement to date. The upper limit on the branching fraction of $psi(3770)rightarrow gamma chi_{c2}$ at a $90%$ confidence level is $mathcal B(psi(3770) rightarrow gamma chi_{c2})<0.64 times 10^{-3}$. The corresponding partial widths are $Gamma(psi(3770) to gamma chi_{c1}) =(67.5pm 4.1pm 6.7)$~keV and $Gamma(psi(3770) to gamma chi_{c2}) < 17.4$~keV.
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