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1.
  • Ablikim, M., et al. (författare)
  • Branching fraction measurement of J/ψ→K<sub>S</sub>K<sub>L</sub> and search for J/ψ→K<sub>S</sub>K<sub>S</sub>
  • 2017
  • Ingår i: BESIII Collaboration.
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Using a sample of 1.31 x 10(9) J/Psi events collected with the BESIII detector at the BEPCII collider, we study the decays of J/Psi -&gt; KSKL and KSKS. The branching fraction of J/Psi -&gt; KSKL is determined to be B(J/Psi -&gt; KSKL) = (1.93 +/- 0.01 (stat) +/- 0.05 (syst)) x 10(-4), which significantly improves on previous measurements. No clear signal is observed for the J/Psi -&gt; KSKS process, and the upper limit at the 95% confidence level for its branching fraction is determined to be B(J/Psi -&gt; KSKS) &lt; 1.4 x 10(-8), which improves on the previous searches by 2 orders in magnitude and reaches the order of the Einstein-Podolsky-Rosen expectation.</p>
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2.
  • Ablikim, M., et al. (författare)
  • Evidence for e+e−→γηc(1S) at center-of-mass energies between 4.01 and 4.60 GeV
  • 2017
  • Ingår i: Physical Review D : covering particles, fields, gravitation, and cosmology. - 2470-0010 .- 2470-0029. ; 96:5
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present first evidence for the process e(+)e(-) -&gt; gamma eta(c)(1S) at six center-of-mass energies between 4.01 and 4.60 GeV using data collected by the BESIII experiment operating at BEPCII. We measure the Born cross section at each energy using a combination of twelve eta(c)(1S) decay channels. We also combine all six energies under various assumptions for the energy-dependence of the cross section. If the process is assumed to proceed via the Y(4260), we measure a peak Born cross section sigma(peak)(e(+)e(-) -&gt; gamma eta(c)(1S)) = 2.11 +/- 0.49 (stat.) +/- 0.36 (syst.) pb with a statistical significance of 4.2 sigma.</p>
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3.
  • Ablikim, M., et al. (författare)
  • Improved measurements of two-photon widths of the chi(cJ) states and helicity analysis for chi(c2) -&gt; gamma gamma
  • 2017
  • Ingår i: Physical Review D : covering particles, fields, gravitation, and cosmology. - AMER PHYSICAL SOC. - 2470-0010 .- 2470-0029. ; 96:9
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Based on 448.1 x 10(6) Psi(3686) events collected with the BESIII detector, the decays Psi(3686) -&gt; gamma chi(cJ), chi(cJ) -&gt; gamma gamma(J = 0, 1, 2) are studied. The decay branching fractions of chi(c0,2) -&gt; gamma gamma are measured to be B(chi(c0) -&gt; gamma gamma) = (1.93 +/- 0.08 +/- 0.05 +/- 0.05) x 10(-4) and B(chi(c2) -&gt; gamma gamma) = (3.10 +/- 0.09 +/- 0.07 +/- 0.11) x 10(-4) which correspond to two-photon decay widths of Gamma(gamma gamma)(chi(c0)) = 2.03 +/- 0.08 +/- 0.06 +/- 0.13 keV and Gamma(gamma gamma)(chi(c2)) = 0.60 +/- 0.02 +/- 0.01 +/- 0.04 keV with a ratio of R = Gamma(gamma gamma)(chi(c2))/Gamma(gamma gamma)(chi(c0)) = 0.295 +/- 0.014 +/- 0.007 +/- 0.027, where the uncertainties are statistical, systematic and associated with the uncertainties of B(Psi(3686) -&gt; gamma chi(c0,2)) and the total widths Gamma(chi(c0,2)), respectively. For the forbidden decay of chi(c1) -&gt; gamma gamma, no signal is observed, and an upper limit on the two-photon width is obtained to be Gamma(gamma gamma)(chi(c1)) &lt; 5.3 eV at the 90% confidence level. The ratio of the two-photon widths between helicity-zero and helicity-two components in the decay chi(c2) -&gt; gamma gamma is also measured to be f(0/2) = Gamma(lambda=0)(gamma gamma) (chi(c2))/Gamma(lambda=2)(gamma gamma) (chi(c2)) = (0.0 +/- 0.6 +/- 1.2) x 10(-2), where the uncertainties are statistical and systematic, respectively.</p>
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4.
  • Ablikim, M., et al. (författare)
  • Improved measurements of X-cJ -&gt; Sigma(+) (Sigma)over-bar(-) and Sigma(0)(Sigma)over-bar(0) decays
  • 2018
  • Ingår i: Physical Review D : covering particles, fields, gravitation, and cosmology. - American Physical Society. - 2470-0010 .- 2470-0029. ; 97:5
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Using a data sample of (448.1 +/- 2.9) x 10(6) psi (3686) events collected with the BESIII detector at the BEPCII collider, we present measurements of branching fractions for the decays X-cJ -&gt; Sigma(+) (Sigma) over bar (-) and Sigma(0) (Sigma) over bar (0) The decays X-c1.2 -&gt; Sigma(+) (Sigma) over bar (-) and Sigma (Sigma) over bar (0) are observed for the first time, and the branching fractions for X-c0 -&gt; Sigma(+) (Sigma) over bar (-) and Sigma(0) (Sigma) over bar (0) decays are measured with improved precision. The branching fraction ratios between the charged and neutral modes are consistent with the prediction of isospin symmetry.</p>
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5.
  • Ablikim, M., et al. (författare)
  • Measurement of branching fractions for psi(3686) -&gt; gamma eta ', gamma eta, and gamma pi(0)
  • 2017
  • Ingår i: Physical Review D : covering particles, fields, gravitation, and cosmology. - AMER PHYSICAL SOC. - 2470-0010 .- 2470-0029. ; 96:5
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Using a data sample of 448 x 10(6) psi(3686) events collected with the BESIII detector operating at the BEPCII storage ring, the decays psi(3686) -&gt; gamma eta and psi(3686) -&gt; gamma pi(0) are observed with a statistical significance of 7.3 sigma and 6.7 sigma, respectively. The branching fractions are measured to be B(psi(3686) -&gt; gamma eta) = (0.85 +/- 0.18 +/- 0.05) x 10(-6) and B(psi(3686) -&gt;gamma pi(0)) = (0.95 +/- 0.16 +/- 0.05) x 10(-6). In addition, we measure the branching fraction of psi(3686) -&gt; gamma eta' to be B(psi(3686) -&gt; gamma eta') = (125.1 +/- 2.2 +/- 6.2)x10(-6), which represents an improvement of precision over previous results.</p>
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6.
  • Ablikim, M., et al. (författare)
  • Measurement of singly Cabibbo-suppressed decays D-0 → <em>π</em><sup>0</sup><em>π</em><sup>0</sup><em>π</em><sup>0</sup>, <em>π</em><sup>0</sup><em>π</em><sup>0</sup><em>η</em>, <em>π</em><sup>0</sup><em>ηη</em> and <em>ηηη</em>
  • 2018
  • Ingår i: Physics Letters B. - ELSEVIER SCIENCE BV. - 0370-2693 .- 1873-2445. ; 781, s. 368-375
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Using a data sample of e(+)e(-) collision data corresponding to an integrated luminosity of 2.93 fb(-1) collected with the BESIII detector at a center-of-mass energy of root s = 3.773 GeV, we search for the singly Cabibbo-suppressed decays D-0 -&gt; pi(0)pi(0)pi(0), pi(0)pi(0)eta, pi(0)eta eta and eta eta eta using the double tag method. The absolute branching fractions are measured to be B(D-0 -&gt; pi(0)pi(0)pi(0)) = (2.0 +/- 0.4 +/- 0.3) x 10(-4), B(D-0 -&gt; pi(0)pi(0)eta) = (3.8 +/- 1.1 +/- 0.7) x 10(-4) and B(D-0 -&gt; pi(0)eta eta) = (7.3 +/- 1.6 +/- 1.5) x 10(-4) with the statistical significances of 4.8 sigma, 3.8 sigma and 5.5 sigma, respectively, where the first uncertainties are statistical and the second ones systematic. No significant signal of D-0 -&gt; eta eta eta is found, and the upper limit on its decay branching fraction is set to be B(D-0 -&gt; eta eta eta) &lt; 1.3 x 10(-4) at the 90% confidence level.</p>
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7.
  • Ablikim, M., et al. (författare)
  • Measurement of the matrix elements for the decays eta' -&gt; eta pi(+) pi(-) and eta' -&gt; eta pi(0)pi(0)
  • 2018
  • Ingår i: Physical Review D : covering particles, fields, gravitation, and cosmology. - AMER PHYSICAL SOC. - 2470-0010 .- 2470-0029. ; 97:1
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Based on a sample of 1.31 x 10(9) J/psi events collected with the BESIII detector, the matrix elements for the decays eta' -&gt; eta pi(+) pi(-) and eta' -&gt; eta pi(0)pi(0) are determined using 351,016 eta' -&gt; (eta -&gt; gamma gamma)pi' pi(-) and 56,249 eta' -&gt; (eta -&gt; gamma gamma)pi(0) pi(0) events with background levels less than 1%. Two commonly used representations are used to describe the Dalitz plot density. We find that an assumption of a linear amplitude does not describe the data well. A small deviation of the obtained matrix elements between eta' -&gt; eta pi(+) pi(-) and eta' -&gt; eta pi(0)pi(0) is probably caused by the mass difference between charged and neutral pions or radiative corrections. No cusp structure in eta' -&gt; eta pi(0)pi(0) is observed.</p>
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8.
  • Ablikim, M., et al. (författare)
  • Measurements of absolute branching fractions for D mesons decays into two pseudoscalar mesons
  • 2018
  • Ingår i: Physical Review D : covering particles, fields, gravitation, and cosmology. - AMER PHYSICAL SOC. - 2470-0010 .- 2470-0029. ; 97:7
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Using a data sample of e(+)e(-) collision data with an integrated luminosity of 2.93 fb(-1) taken at the center-of-mass energy root s = 3.773 GeV with the BESIII detector operating at the BEPCII storage rings, we measure the absolute branching fractions of the two-body hadronic decays D+ -&gt; pi(+)pi(0), K+pi(0), pi(+)eta., K+eta., pi(+)eta', K+eta', K-S(0)pi(+), (KSK+)-K-0, and D-0 -&gt; pi(+)pi(-), K+ K-, K--/+pi(+/-), K-S(0)pi(0), K-S(0)eta, K-S(0)eta' Our results are consistent with previous measurements within uncertainties. Among them, the branching fractions for D+-&gt; pi(+)pi(0), K+pi(0), pi(+)eta, pi(+)eta', (KSK+)-K-0, (KSK+)-K-0 and D-0 -&gt; K-S(0)pi(0), K-S(0)eta, K-S(0)eta' are determined with improved precision compared to the world average values.</p>
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9.
  • Ablikim, M., et al. (författare)
  • Measurements of absolute branching fractions for Lambda(+)(c) -&gt; Xi K-0(+) and Xi(1530)K-0(+)
  • 2018
  • Ingår i: Physics Letters B. - ELSEVIER SCIENCE BV. - 0370-2693 .- 1873-2445. ; 783, s. 200-206
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We report the first measurements of absolute branching fractions for the W-exchange-only processes Lambda(+)(c) -&gt; Xi K-0(+) and Lambda(+)(c)-&gt; Xi(1530)K-0(+) with the double-tag technique, by analyzing an e(+)e(-) collision data sample, that corresponds to an integrated luminosity of 567 pb(-1) collected at a center-of-mass energy of 4.6 GeV by the BESIII detector. The branching fractions are measured to be B(Lambda(+)(c)-&gt; Xi K-0(+)) = (5.90 +/- 0.86 +/- 0.39) x 10(-3) and B(Lambda(+)(c)-&gt; Xi(1530)K-0(+)) = (5.02 +/- 0.99 +/- 0.31) x 10(-3), where the first uncertainties are statistical and the second systematic. Our results are more precise than the previous relative measurements.</p>
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10.
  • Ablikim, M., et al. (författare)
  • Measurements of the branching fractions for the semileptonic decays D-s(+) -&gt; phi e(+)v(e), phi mu(+)v(mu), eta mu(+)v(mu) and eta 'mu(+)v(mu)
  • 2018
  • Ingår i: Physical Review D : covering particles, fields, gravitation, and cosmology. - American Physical Society. - 2470-0010 .- 2470-0029. ; 97:1
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>By analyzing 482 pb(-1) of e(+) e(-) collision data collected at the center-of-mass energy root s = 4.009 GeV with the BESIII detector, we measure the branching fractions for the semi-leptonic decays D-s(+) -&gt; phi e(+)v(e), phi mu(+)v(mu), eta mu(+)v(mu) and eta'mu(+)v(mu) to be B(D-s(+) -&gt; phi e(+)v(e)) = (2.26 +/- 0.45 +/- 0.09)%, B(D-s(+) -&gt; phi mu+v(mu)) = (1.94 +/- 0.53 +/- 0.09)%, B(D-s(+) -&gt; eta mu(+)v(mu)) = (2.42 +/- 0.46 +/- 011)% and B(D-s(+) -&gt; eta'mu(+)v(mu)) = (1.06 +/- 0.54 +/- 0.07)%, where the first and second uncertainties are statistical and systematic, respectively. The branching fractions for the three semi-muonic decays D-s(+) -&gt; phi mu(+)v(mu), eta mu(+)v(mu) and eta'mu(+)v(mu) are determined for the first time and that of D-s(+) -&gt; phi e(+)v(e) is consistent with the world average value within uncertainties.</p>
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