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1.
  • Ablikim, M., et al. (författare)
  • Amplitude analysis of the D+ -> 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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2.
  • Ablikim, M., et al. (författare)
  • Determination of the number of ψ(3686) events at BESIII
  • 2018
  • Ingår i: Chinese Physics C, High Energy Physics & Nuclear Physics. - 1674-1137 .- 0899-9996. ; 42:2
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>The numbers of psi(3686) events accumulated by the BESIII detector for the data taken during 2009 and 2012 are determined to be (107.0 +/- 0.8)x10(6) and (341.1 +/- 2.1)x10(6), respectively, by counting inclusive hadronic events, where the uncertainties are systematic and the statistical uncertainties are negligible. The number of events for the sample taken in 2009 is consistent with that of the previous measurement. The total number of psi(3686) events for the two data taking periods is (448.1 +/- 2.9) x 10(6).</p><p></p>
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3.
  • 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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4.
  • 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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5.
  • Ablikim, M., et al. (författare)
  • Observation of electromagnetic Dalitz decays J/psi -&gt; 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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6.
  • 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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7.
  • Ablikim, M., et al. (författare)
  • Precision measurement of the mass of the tau lepton
  • 2014
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 90:1
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>An energy scan near the tau pair production threshold has been performed using the BESIII detector. About 24 pb(-1) of data, distributed over four scan points, were collected. This analysis is based on t pair decays to ee, e mu, eh, h, hh, e.,. and p. final states, where h denotes a charged p or K. The mass of the t lepton is measured from a maximum likelihood fit to the t pair production cross- section data to be m(tau) = 1776.91 +/- 0.12_0.10 - 0.13 _ MeV/c(2), which is currently the most precise value in a single measurement.</p>
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8.
  • Ablikim, M., et al. (författare)
  • Search for the radiative transitions Psi(3770) -&gt; gamma eta(c) and gamma eta(c) (2S)
  • 2014
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 89:11, s. 112005
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>By using a 2.92 fb-1 data sample taken at pffisffiffi 3.773 GeV with the BESIII detector operating at the BEPCII collider, we search for the radiative transitions.d3770c and cd2S through the hadronic decays cdcd2S. K0 SK p. No significant excess of signal events above background is observed. We set upper limits at a 90% confidence level for the product branching fractions to be Bdd3770cxBd.c. K0 SK k p &lt; 1.6x10-5 and Bd.d3770cd2SxBd.cd2S. K0 SK p&lt;5.6x10-6. Combining our result with world-average values of Bd.cd.cd2S. K0 SK p, we find the branching fractions Bd.d3770c&lt; 6.8 x 10-4 and Bd.d3770cd2S&lt; 2.0 x 10-3 at a 90% confidence level.</p>
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9.
  • Ablikim, M., et al. (författare)
  • Search for the rare decays J/y -&gt; D-s(-) rho(+) and J/psi -&gt; &lt;(D)over bar(0)&lt;(K)over bar*(0)
  • 2014
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 89:7, s. 071101
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>A search for the rare decays of J/psi -&gt; D-S(-) rho(+) + c.c. and J/psi -&gt; &lt;(D)over bar(0)&lt;(K)over bar*(0) + c.c. is performed with a data sample of 225.3-million J/psi events collected with the Beijing Spectrometer III detector. No evident signal is observed. Upper limits on the branching fractions are determined to be beta(J/psi -&gt; D-S(-)rho(+) + c.c.) &lt; 1.3 x 10(-5) and beta(J/psi -&gt; &lt;(D)over bar(0)&lt;(K)over bar*(0) + c.c.) &lt; 2.5 x 10(-6) at the 90% confidence level.</p>
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10.
  • Ablikim, M., et al. (författare)
  • Study of e(+)e(-) -&gt; p(p)over-bar in the vicinity of psi(3770)
  • 2014
  • Ingår i: Physics Letters B. - 0370-2693 .- 1873-2445. ; 735, s. 101-107
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Using 2917 pb(-1) of data accumulated at 3.773 GeV, 44.5 pb(-1) of data accumulated at 3.65 GeV and data accumulated during a psi(3770) line-shape scan with the BESIII detector, the reaction e(+)e(-) -&gt; p (p) over bar is studied considering a possible interference between resonant and continuum amplitudes. The cross section of e(+)e(-) -&gt; psi(3770) -&gt; p (p) over bar, sigma(e(+)e(-)-&gt; psi(3770) -&gt; p (p) over bar), is found to have two solutions, determined to be (0.059(-0.020)(+0.070) +/- 0.012) pb with the phase angle phi = (255.8(-26.6)(+39.0) +/- 4.8). (&lt; 0.166 pb at the 90% confidence level), or sigma(e(+)e(-) -&gt; psi(3770) -&gt; p&lt;(p)over bar&gt;) = (2.57(-0.13)(+0.12) +/- 0.12) pb with phi = (266.9(-6.3)(+6.1) +/- 0.9)degrees both of which agree with a destructive interference. Using the obtained cross section of psi(3770) -&gt; p (p) over bar, the cross section of p (p) over bar -&gt; psi(3770), which is useful information for the future PANDA experiment, is estimated to be either (9.8(-3.9)(+11.8)) nb (&lt; 27.5 nb at 90% C.L.) or (425.6(-43.7)(+42.9)) nb. (C) 2014 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license.</p>
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