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31.
  • Ablikim, M., et al. (författare)
  • Observation of $e^+e^− → γX$(3872) at BESIII
  • 2014
  • Ingår i: PHYSICAL REVIEW LETTERS. - 1079-7114. ; 112:9
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>With data samples collected with the BESIII detector operating at the BEPCII storage ring at center-of-mass energies from 4.009 to 4.420 GeV, the process $e^{+} e^{-} \to \gamma X(3872)$ is observed for the first time with a statistical significance of $6.3\sigma$. The measured mass of the $X(3872)$ is ($3871.9\pm 0.7_{\rm stat.}\pm 0.2_{\rm sys.}$) MeV/$c^2$, in agreement with previous measurements. Measurements of the product of the cross section $\sigma[e^{+} e^{-} \to \gamma X(3872)]$ and the branching fraction $\mathcal{B}[X(3872) \to \pi^{+} \pi^{-} J/\psi]$ at center-of-mass energies 4.009, 4.229, 4.260, and 4.360 GeV are reported. Our measurements are consistent with expectations for the radiative transition process $Y(4260) \to \gamma X(3872)$.</p>
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32.
  • Ablikim, M., et al. (författare)
  • Observation of electromagnetic Dalitz decays J/\psi \to P e^+e^-
  • 2014
  • Ingår i: PHYSICAL REVIEW D. - 2470-0010. ; 89:9
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Based on a sample of (225.3\pm2.8)\times 10^{6} J/\psi events collected with the BESIII detector, the electromagnetic Dalitz decays of J/\psi \to P e^+e^-(P=\eta'/\eta/\pi^0) are studied. By reconstructing the pseudoscalar mesons in various decay modes, the decays J/\psi \to \eta' e^+e^-, J/\psi \to \eta e^+e^- and J/\psi \to \pi^0 e^+e^- are observed for the first time. The branching fractions are determined to be \mathcal{B}(J/\psi\to \eta' e^+e^-) = (5.81\pm0.16\pm0.31)\times10^{-5}, \mathcal{B}(J/\psi\to \eta e^+e^-) = (1.16\pm0.07\pm0.06)\times10^{-5}, and \mathcal{B}(J/\psi\to \pi^0 e^+e^-)=(7.56\pm1.32\pm0.50)\times10^{-7}, where the first errors are statistical and the second ones systematic.</p>
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33.
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34.
  • Ablikim, M., et al. (författare)
  • Precision measurements of $B(D^+ \rightarrow \mu^+ \nu_{\mu})$, the pseudoscalar decay constant $f_{D^+}$, and the quark mixing matrix element $|V_{\rm cd}|$
  • 2014
  • Ingår i: PHYSICAL REVIEW D. - 2470-0010. ; 89:5
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We report a measurement of the branching fraction $B(D^+ \rightarrow \mu^+ \nu_{\mu}) = [3.71 \pm 0.19 (\rm stat) \pm 0.06 (\rm sys)]\times 10^{-4}$ based on 2.92 ${\rm fb^{-1}}$ of data accumulated at $\sqrt{s}=3.773$ GeV with the BESIII detector at the BEPCII collider. This measurement, in conjunction with the Cabibbo-Kobayashi-Maskawa matrix element $|V_{\rm cd}|$ determined from a global Standard Model fit, implies a value for the weak decay constant $f_{D^+}=(203.2 \pm 5.3 \pm 1.8)$ MeV. Additionally, using this branching fraction measurement together with a Lattice QCD prediction for $f_{D^+}$, we find $|V_{\rm cd}|=0.2210\pm 0.0058 \pm 0.0047$. In either case, these are the most precise results for these quantities to date.</p>
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35.
  • Ablikim, M., et al. (författare)
  • Search for a light CP-odd Higgs boson in radiative decays of J/psi
  • 2016
  • Ingår i: PHYSICAL REVIEW D. - 2470-0010. ; 93:5
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We search for a light Higgs boson A(0) in the fully reconstructed decay chain of J/psi -&gt; gamma A(0), A(0)-&gt; mu(+)mu(-) using (225.0 +/- 2.8) x 10(6) J/psi events collected by the BESIII experiment. The A(0) is a hypothetical CP-odd light Higgs boson predicted by many extensions of the Standard Model including two spin-0 doublets plus an extra singlet. We find no evidence for A(0) production and set 90% confidence-level upper limits on the product branching fraction B(J/psi -&gt; gamma A(0)) x B(A(0)-&gt; mu(+)mu(-)) in the range of (2.8-495.3) x 10(-8) for 0.212 &lt;= mA(0) &lt;= 3.0 GeV/c(2). The new limits are five times below our previous results, and the nature of the A(0) is constrained to be mostly singlet.</p>
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36.
  • Ablikim, M., et al. (författare)
  • Study of J/Psi -&gt; p(p)over-bar phi at BESIII
  • 2016
  • Ingår i: PHYSICAL REVIEW D. - 2470-0010. ; 93:5
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Using a data sample of 1.31×109 J/ψ events accumulated with the BESIII detector, the decay J/ψ→pp¯ϕ is studied via two decay modes, ϕ→KS0KL0 and ϕ→K+K-. The branching fraction of J/ψ→pp¯ϕ is measured to be B(J/ψ→pp¯ϕ)=[5.23±0.06(stat)±0.33(syst)]×10-5, which agrees well with a previously published measurement, but with a significantly improved precision. No evident enhancement near the pp¯ mass threshold, denoted as X(pp¯), is observed, and the upper limit on the branching fraction of J/ψ→X(pp¯)ϕ→pp¯ϕ is determined to be B(J/ψ→X(pp¯)ϕ→pp¯ϕ)&lt;2.1×10-7 at the 90% confidence level.</p>
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37.
  • Ablikim, M., et al. (författare)
  • Study of psi decays to the Xi(-)(Xi)over-bar(+) and Sigma(1385)(-/+)(Sigma)over-bar(1385)(+/-) final states
  • 2016
  • Ingår i: PHYSICAL REVIEW D. - 2470-0010. ; 93:7
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We study the decays of the charmonium resonances J/psi and psi(3686) to the final states Xi(-)(Xi) over bar (+), S(1385)(-/+)(Sigma) over bar (1385)(+/-) based on a single baryon tag method using data samples of (223.7 +/- 1.4) x 10(6) J/psi and (106.4 +/- 0.9) x 10(6) psi(3686) events collected with the BESIII detector at the BEPCII collider. The decay psi(3686) -&gt; Sigma(1385)(-/+)(Sigma) over bar (1385)(+/-) is observed for the first time, and the measurements of the other processes, including the branching fractions and angular distributions, are in good agreement with, and much more precise than, the previously published results. Additionally, the ratios B(psi(3686)-&gt;Xi(-)(Xi) over bar (+))/B(J/psi -&gt;Xi(-)(Xi) over bar (+)), B(psi(3686)-&gt;Sigma(1385)(-)(Sigma) over bar (1385)(+))/B(J/psi -&gt;Sigma(1385)(-)(Sigma) over bar (1385)(+)) and B(psi(3686)-&gt;Sigma(1385)(+)(Sigma) over bar (1385)(-))/B(J/psi -&gt;Sigma(1385)(+)(Sigma) over bar (1385)(-)) are detetmind</p>
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38.
  • Ablikim, M., et al. (författare)
  • Measurements of (XcJ)-&gt; K+K-K+K- decays
  • 2006
  • Ingår i: Physics Letters B. - 0370-2693 .- 1873-2445. ; 642:3, s. 197-202
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Using 14M psi(2S) events taken with the BESII detector, chi(cJ) -&gt; 2(K+K-) decays are studied. For the four-kaon final state, the branching fractions are B(chi(c0,1,2) -&gt;.2(K+K-)) = (3.48 +/- 0.23 +/- 0.47) x 10(-3), (0.70 +/- 0.13 +/- 0.10) x 10(-3), and (2.17 +/- 0.20 +/- 0.31) x 10(-3). For the phi K+K- final state, the branching fractions, which are measured for the first time, are B(chi(c0,1,2) -&gt; phi K+K-) = (1.03 +/- 0.22 +/- 0.15) x 10(-3), (0.46 +/- 0.16 +/- 0.06) x 10(-3), and (1.67 +/- 0.26 +/- 0.24) x 10(-4). For the phi phi final state, B(chi(c0,2) -&gt; phi phi) = (0.94 +/- 0.21 +/- 0.13) x 10(-3) and (1.70 +/- 0.30 +/- 0.25) x 10(-3).</p>
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39.
  • Ablikim, M., et al. (författare)
  • Measurement of the Absolute Branching Fraction for Lambda(+)(c) -&gt; Lambda e(+)nu(e)
  • 2015
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 115:22
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We report the first measurement of the absolute branching fraction for Lambda(+)(c) -&gt; Lambda e(+)nu(e). This measurement is based on 567 pb(-1) of e(+)e(-) annihilation data produced at root s = 4.599 GeV, which is just above the Lambda(+)(c)Lambda(-)(c) threshold. The data were collected with the BESIII detector at the BEPCII storage rings. The branching fraction is determined to be B(Lambda(+)(c) -&gt; Lambda e(+)nu(e)) = [3.63 +/- 0.38(stat) +/- 0.20(syst)] %, representing a significant improvement in precision over the current indirect determination. As the branching fraction for Lambda(+)(c) -&gt; Lambda e(+)nu(e) is the benchmark for those of other Lambda(+)(c) semileptonic channels, our result provides a unique test of different theoretical models, which is the most stringent to date.</p>
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40.
  • Ablikim, M., et al. (författare)
  • Determination of the number of J/psi events with inclusive J/psi decays
  • 2017
  • Ingår i: Chinese Physics C, High Energy Physics & Nuclear Physics. - 1674-1137 .- 0899-9996. ; 41:1
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>A measurement of the number of J/psi events collected with the BESIII detector in 2009 and 2012 is performed using inclusive decays of the J/psi. The number of J/psi events taken in 2009 is recalculated to be (223.7 +/- 1.4) x 10(6), which is in good agreement with the previous measurement, but with significantly improved precision due to improvements in the BESIII software. The number of J/psi events taken in 2012 is determined to be (1086.9 +/- 6.0) x 10(6). In total, the number of J/psi events collected with the BESIII detector is measured to be (1310.6 +/- 7.0) x 10(6), where the uncertainty is dominated by systematic effects and the statistical uncertainty is negligible.</p>
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