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1.
  • Ablikim, M., et al. (författare)
  • Observation of electromagnetic Dalitz decays J/psi -> Pe(+)e(-)
  • 2014
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 89:9
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Based on a sample of (225.3 +/- 2.8) x 10(6) J/psi events collected with the BESIII detector, the electromagnetic Dalitz decays of J/psi -&gt; Pe(+)e(-)(P = eta'/eta/pi(0)) are studied. By reconstructing the pseudoscalar mesons in various decay modes, the decays J/psi -&gt; eta'e(+)e(-), J/psi -&gt; eta e(+)e(-), and J/psi -&gt; pi(0)e(+)e(-) are observed for the first time. The branching fractions are determined to be B(J/psi -&gt; eta'e(+)e(-)) = (5.81 +/- 0.16 +/- 0.31) x 10(-5), B(J/psi -&gt; eta e(+)e(-)) = (1.16 +/- 0.07 +/- 0.06) x 10(-5), and B(J/psi -&gt; pi(0)e(+)e(-)) = (7.56 +/- 1.32 +/- 0.50) x 10(-7), where the first errors are statistical and the second ones systematic.</p>
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2.
  • Ablikim, M., et al. (författare)
  • Observation of eta' -&gt; pi(+) pi(-) pi(+) pi(-) and eta' -&gt; pi(+) pi(-) pi(0) pi(0)
  • 2014
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 112:25, s. 251801
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Using a sample of 1.3 x 10(9) J/psi events collected with the BESIII detector, we report the first observation of eta' -&gt; pi(+) pi(-) pi(+) pi(-) and eta' -&gt; pi(+) pi(-) pi(0) pi(0). The measured branching fractions are B(eta' -&gt; pi(+) pi(-) pi(+) pi(-)) = [8.53 +/- 0.69(stat.) +/- 0.64(syst.)] x 10(-5) and B(eta' -&gt; pi(+) pi(-) pi(0) pi(0)) = [1.82 +/- 0.35(stat.) +/- 0.18(syst.)] x 10(-4), which are consistent with theoretical predictions based on a combination of chiral perturbation theory and vector-meson dominance.</p>
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3.
  • Ablikim, M., et al. (författare)
  • Amplitude analysis of the D+ -&gt; K-S(0)pi + (0)(pi) Dalitz plot
  • 2014
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 89:5, s. 052001
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We perform an analysis of the D+ -&gt; K-S(0)pi + (0)(pi) Dalitz plot using a data set of 2.92 fb(-1) of e(+) e(-) collisions at the (3770) mass accumulated by the BESIII experiment, in which 166694 candidate events are selected with a background of 15.1%. The Dalitz plot is found to be well represented by a combination of six quasitwo- body decay channels [k(SP)(0)(+) (1450)(+,) ] plus a small nonresonant component. Using the fit fractions from this analysis, partial branching ratios are updated with higher precision than previous measurements.</p>
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4.
  • Ablikim, M., et al. (författare)
  • Analysis of D+ -&gt; (K)over-bar(0)e(+)nu(e) and D+ -&gt; pi(0)e(+)nu(e) semileptonic decays
  • 2017
  • Ingår i: Physical Review D : covering particles, fields, gravitation, and cosmology. - AMER PHYSICAL SOC. - 2470-0010 .- 2470-0029. ; 96:1
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Using 2.93 fb(-1) of data taken at 3.773 GeV with the BESIII detector operated at the BEPCII collider, we study the semileptonic decays D+ -&gt; (K) over bar (0)e(+)nu(e) and D+ -&gt; pi(0)e(+)nu(e). We measure the absolute decay branching fractions B(D+ -&gt; (K) over bar (0)e(+)nu(e)) = (8.60 +/- 0.06 +/- 0.15) x 10(-2) and B(D+ -&gt; pi(0)e(+)nu(e)) = (3.63 +/- 0.08 +/- 0.05) x 10(-3), where the first uncertainties are statistical and the second systematic. We also measure the differential decay rates and study the form factors of these two decays. With the values of |V-cs| and |V-cd| from Particle Data Group fits assuming Cabibbo-Kobayashi-Maskawa (CKM) unitarity, we obtain the values of the form factors at q(2) = 0, f(+)(K)(0) = 0.725 +/- 0.004 +/- 0.012, and f(+)(pi)(0) = 0.622 +/- 0.012 +/- 0.003. Taking input from recent lattice QCD calculations of these form factors, we determine values of the CKM matrix elements |V-cs| = 0.944 +/- 0.005 +/- 0.015 +/- 0.024 and |V-cd| = 0.210 +/- 0.004 +/- 0.001 +/- 0.009, where the third uncertainties are theoretical.</p>
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5.
  • Ablikim, M., et al. (författare)
  • Dark photon search in the mass range between 1.5 and 3.4 GeV/c
  • 2017
  • Ingår i: Physics Letters B. - 0370-2693 .- 1873-2445. ; 774, s. 252-257
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Using a data set of 2.93 fb taken at a center-of-mass energy root s = 3.773 GeV with the BESIII detector at the BEPCII collider, we perform a search for an extra U(1) gauge boson, also denoted as a dark photon. We examine the initial state radiation reactions e(+)e(-) -&gt; e(+)e(-) gamma(ISR) and e(+)e(-) -&gt; mu(+)mu(-) gamma(ISR) for this search, where the dark photon would appear as an enhancement in the invariant mass distribution of the leptonic pairs. We observe no obvious enhancement in the mass range between 1.5 and 3.4 GeV/c(2) and set a 90% confidence level upper limit on the mixing strength of the dark photon and the Standard Model photon. We obtain a competitive limit in the tested mass range.</p>
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6.
  • Ablikim, M., et al. (författare)
  • Improved measurement of the absolute branching fraction of D+ -&gt; (K)over-bar(0)mu(+)nu(mu)
  • 2016
  • Ingår i: European Physical Journal C. - SPRINGER. - 1434-6044 .- 1434-6052. ; 76:7
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>By analyzing 2.93 fb(-1) of data collected at root s = 3.773 GeV with the BESIII detector, we measure the absolute branching fraction B(D+ -&gt; (K) over bar (0) (+)(mu)nu(mu)) = (8.72 +/- 0.07(stat). +/- 0.18(sys).) %, which is consistent with previous measurements within uncertainties but with significantly improved precision. Combining the Particle Data Group values of B(D-0 -&gt; K- mu(+)nu(mu)), B(D+-&gt; (K) over bar (0)e(+)nu(e)), and the lifetimes of the D-0 and D+ mesons with the value of B(D+ -&gt; (K) over bar (0)mu(+)nu(mu)) measured in this work, we determine the following ratios of partial widths: Gamma (D-0 -&gt; (K) over bar (-)mu(+)nu(mu))/Gamma (D+ -&gt; (K) over bar (0)mu+nu(mu)) = 0.963 +/- 0.044 and Gamma (D+ -&gt; (K) over bar (0) mu+nu(mu))/Gamma(D+ -&gt; (K) over bar (0)e+nu(e)) = 0.988 +/- 0.033.</p>
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7.
  • Ablikim, M., et al. (författare)
  • Improved measurements of branching fractions for eta(c) -&gt; phi phi and omega phi
  • 2017
  • Ingår i: Physical Review D : covering particles, fields, gravitation, and cosmology. - AMER PHYSICAL SOC. - 2470-0010 .- 2470-0029. ; 95:9
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Using (223.7 +/- 1.4) x 10(6) J / Psi events accumulated with the BESIII detector, we study eta(c) decays to phi phi and omega phi final states. The branching fraction of n(c) -&gt; phi phi is measured to be Br(eta(c) -&gt; phi phi) = (2.5 +/- 0(-0.7)(+0.3) +/- 0.6) X 10(-3,) where the first uncertainty is statistical, the second is systematic, and the third is from the uncertainty of Br(J / Psi -&gt; gamma eta(C)). No significant signal for the double Okubo-Zweig-Iizuka suppressed decay of eta(c) -&gt; omega phi is observed, and the upper limit on the branching fraction is determined to be Br(eta(c) -&gt; omega phi) &lt; 2.5 x 10(-4) at the 90% confidence level.</p>
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8.
  • Ablikim, M., et al. (författare)
  • Measurement of chi(cJ) decaying into eta ' K+K-
  • 2014
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 89:7, s. 074030
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Using (106.41 +/- 0.86) x 10(6) Psi(3686) events collected with the BESIII detector at BEPCII, we study for the first time the decay chi(cJ) -&gt; eta'K+K- (J = 1, 2), where eta' -&gt; gamma rho(0) and eta' -&gt; eta pi(+)pi(-). A partial wave analysis in the covariant tensor amplitude formalism is performed for the decay chi(c1) -&gt; eta'K+K-. Intermediate processes chi(c1) -&gt; eta'f(2)'(1525) chi(c1) -&gt; K-0*(1430)K-+/-(-/+) (K-0*(1430)(+/-) -&gt; eta'K-+/-) are observed with statistical significances larger than 5 sigma, and their branching fractions are measured.</p>
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9.
  • Ablikim, M., et al. (författare)
  • Measurement of the branching fraction for psi(3686) -&gt; omega K+K-
  • 2014
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 89:11, s. 112006
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>With 1.06 x 10(8) psi(3686) events collected with the BESIII detector, the branching fraction of psi(3686) -&gt; omega K+K- is measured to be (1.54 +/- 0.04 +/- 0.11) x 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 -&gt; omega K+K-, the ratio B(psi(3868) -&gt; K+K-)/B(J/psi -&gt; K+K-) is determined to be (18.4 +/- 3.7)%. This constitutes a significantly improved test of the 12% rule, with the uncertainty now dominated by the J/psi branching fraction.</p>
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10.
  • Ablikim, M., et al. (författare)
  • Measurement of the branching fractions of D-s(+) -&gt; eta ' X and D-s(+) -&gt; eta 'rho(+) in e(+)e(-) -&gt; Ds+Ds-
  • 2015
  • Ingår i: Physics Letters B. - 0370-2693 .- 1873-2445. ; 750, s. 466-474
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We study D-s(+) decays to final states involving the eta' with a 482 pb(-1) data sample collected at root s = 4.009 GeV with the BESIII detector at the BEPCII collider. We measure the branching fractions B(D-s(+) -&gt; eta'X) = (8.8 +/- 1.8 +/- 0.5)% and B(D-s(+) &gt; eta'rho(+)) = (5.8 +/- 1.4 +/- 0.4)% where the first uncertainty is statistical and the second is systematic. In addition, we estimate an upper limit on the non-resonant branching ratio B(D-s(+) -&gt; eta'pi(+)pi(0)) &lt; 5.1% at the 90% confidence level. Our results are consistent with CLEO's recent measurements and help to resolve the disagreement between the theoretical prediction and CLEO's previous measurement of B(D-s(+) -&gt; eta'rho(+)).</p>
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