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1.
  • Ablikim, M., et al. (författare)
  • Amplitude analysis of D<sup>0</sup> -&gt; K<sup> -</sup>π<sup>+</sup>π<sup>+</sup>π<sup>-</sup>
  • 2017
  • Ingår i: Physical Review D : covering particles, fields, gravitation, and cosmology. - 2470-0010 .- 2470-0029. ; 95:7
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present an amplitude analysis of the decay D-0 -&gt; K- pi(+)pi(+)pi(-) based on a data sample of 2.93 fb(-1) acquired by the BESIII detector at the psi(3770) resonance. With a nearly background free sample of about 16000 events, we investigate the substructure of the decay and determine the relative fractions and the phases among the different intermediate processes. Our amplitude model includes the two-body decays D-0 -&gt; (K) over bar*(0)rho(0), D-0 -&gt; K- a(1)(+) (1260) and D-0 -&gt; K-1(-)(1270)pi(+), the three-body decays D-0 -&gt; K-1(-)*(0)pi(+)pi(-) and D-0 -&gt; K- pi(+)rho(0), as well as the four-body nonresonant decay D-0 -&gt; K- pi(+)pi(+)pi(-). The dominant intermediate process is D-0 -&gt; K(-)a(1)(+)(1260)accounting for a fit fraction of 54.6%.</p>
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2.
  • Ablikim, M., et al. (författare)
  • Amplitude analysis of the chi(c1) -&gt; eta pi(+)pi(-) decays
  • 2017
  • Ingår i: Physical Review D : covering particles, fields, gravitation, and cosmology. - AMER PHYSICAL SOC. - 2470-0010 .- 2470-0029. ; 95:3
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Using 448.0 x 10(6) psi(3686) events collected with the BESIII detector, an amplitude analysis is performed for psi(3686) -&gt; gamma chi(c1), chi(c1) -&gt;eta pi(+)pi(-) decays. The most dominant two- body structure observed is a(0)(980)(+/-) pi(-/+); a(0)(980)(+/-) -&gt; eta pi(+/-.) line shape is modeled using a dispersion relation, and a significant nonzero a(0) (980) coupling to the eta'pi channel is measured. We observe chi(c1) -&gt; a(2)(1700)pi production for the first time, with a significance larger than 17 sigma. The production of mesons with exotic quantum numbers, J(PC) = 1(-+), is investigated, and upper limits for the branching fractions chi(c1) -&gt; pi(1)(1400)(+/-)pi(-/+) , chi(c1) -&gt; pi(1)(1600)(+/-)pi(-/+) and chi(c1) -&gt; pi 1(2015)(+/-)pi(-/+) with subsequent pi(1)(X)(+/-) -&gt; eta pi(+/-) decay, are determined.</p>
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3.
  • Ablikim, M., et al. (författare)
  • Measurement of integrated luminosity and center-of-mass energy of data taken by BESIII at √<em>s</em>=2.125 GeV
  • 2017
  • Ingår i: Chinese Physics C, High Energy Physics & Nuclear Physics. - 1674-1137 .- 0899-9996. ; 41:11
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>To study the nature of the state Y (2175), a dedicated data set of e(+)e(-) collision data was collected at the center-of-mass energy of 2.125 GeV with the BESIII detector at the BEPCII collider. By analyzing large-angle Bhabha scattering events, the integrated luminosity of this data set is determined to be 108.49 +/- 0.02 +/- 0.85 pb(-1), where the first uncertainty is statistical and the second one is systematic. In addition, the center-of-mass energy of the data set is determined with radiative dimuon events to be 2126.55 +/- 0.03 +/- 0.85 MeV, where the first uncertainty is statistical and the second one is systematic.</p>
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4.
  • Ablikim, M., et al. (författare)
  • Measurements of the absolute branching fractions for D-s(+) -&gt; eta e(+)nu(e) and D-s(+) -&gt; eta ' e(+)nu(e)
  • 2016
  • Ingår i: PHYSICAL REVIEW D. - 2470-0010. ; 94:11
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>By analyzing 482 pb(-1) of e(+)e(-) collision data collected at root s = 4.009 GeV with the BESIII detector at the BEPCII collider, we measure the absolute branching fractions for the semileptonic decays D-s(+) -&gt; eta e(+)nu(e) and D-s(+) -&gt; eta ' e(+)nu(e) to be B(D-s(+) -&gt; eta e(+)nu(e)) = (2.30 +/- 0.31 +/- 0.08)% and B(D-s(+) -&gt; eta ' e(+)nu(e)) = (0.93 +/- 0.30 +/- 0.05)%, respectively, and their ratio B(D-s(+) -&gt; eta ' e(+)nu(e)) / B(D-s(+) -&gt; eta ' e(+)nu(e)) = 0.40 +/- 0.14 +/- 0.02, where the first uncertainties are statistical and the second ones are systematic. The results are in good agreement with previous measurements within uncertainties; they can be used to determine the eta-eta' mixing angle and improve upon the D-s(+) semileptonic branching ratio precision.</p>
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5.
  • Ablikim, M., et al. (författare)
  • Observation of a Neutral Structure near the D(D)over-bar* Mass Threshold in e(+)e(-) -&gt; (D(D)over-bar*)(0)pi(0) at root s=4.226 and 4.257 GeV
  • 2015
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 115:22
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>A neutral structure in the D (D) over bar* system around the D (D) over bar* mass threshold is observed with a statistical significance greater than 10 sigma in the processes e(+)e(-) -&gt; D+D*(-)pi(0) + c.c. and e(+)e(-) -&gt; D-0(D) over bar*(0)pi(0) + c.c. at root s = 4.226 and 4.257 GeV in the BESIII experiment. The structure is denoted as Z(c)(3885)(0). Assuming the presence of a resonance, its pole mass and width are determined to be [3885.7(-5.7)(+4.3) (stat) +/- 8.4(syst)] MeV/c(2) and [35(-12)(+11) (stat) +/- 15(syst)] MeV, respectively. The Born cross sections are measured to be sigma[e(+)e(-) -&gt; Z(c)(3885)(0)pi(0); Z(c)(3885)(0) -&gt; D (D) over bar*] = [77 +/- 13(stat) +/- 17(syst)] pb at 4.226 GeV and [47 +/- 9(stat) +/- 10(syst)] pb at 4.257 GeV. The ratio of decay rates B[Z(c)(3885)(0) -&gt; D+D*(-) + c.c.]/B[Z(c)(3885)(0) -&gt; D-0(D) over bar*(0) + c.c.] is determined to be 0.96 +/- 0.18(stat) +/- 0.12(syst), consistent with no isospin violation in the process, Z(c)(3885)(0) -&gt; D (D) over bar*.</p>
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6.
  • Ablikim, M., et al. (författare)
  • Observation of an Anomalous Line Shape of the eta 'pi(+)pi(-) Mass Spectrum near the p(p)over-bar Mass Threshold in J/psi -&gt; gamma eta 'pi(+)pi(-)
  • 2016
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 117:4
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Using 1.09 x 10(9) J/psi events collected by the BESIII experiment in 2012, we study the J / psi -&gt; gamma eta'pi(+)pi(-) process and observe a significant abrupt change in the slope of the eta'pi(+)pi(-) invariant mass distribution at the proton-antiproton (p (p) over bar) mass threshold. We use two models to characterize the eta'pi(+)pi(-) line shape around 1.85 GeV/c(2): one that explicitly incorporates the opening of a decay threshold in the mass spectrum (Flatte formula), and another that is the coherent sum of two resonant amplitudes. Both fits show almost equally good agreement with data, and suggest the existence of either a broad state around 1.85 GeV/c(2) with strong couplings to the c final states or a narrow state just below the p (p) over bar mass threshold. Although we cannot distinguish between the fits, either one supports the existence of a p (p) over bar moleculelike state or bound state with greater than 7 sigma significance.</p>
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7.
  • Ablikim, M., et al. (författare)
  • Observation of e(+)e(-) -&gt; eta ' J/psi center-of-mass energies between 4.189 and 4.600 GeV
  • 2016
  • Ingår i: PHYSICAL REVIEW D. - 2470-0010. ; 94:3
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>The process e(+)e(-) -&gt; eta' J/psi is observed for the first time with a statistical significance of 8.6 sigma at center-of-mass energy root s = 4.226 GeV and 7.3 sigma at root s = 4.258 GeV using data samples collected with the BESIII detector. The Born cross sections are measured to be (3.7 +/- 0.7 +/- 0.3) and (3.9 +/- 0.8 +/- 0.3) pb at root s = 4.226 and 4.258 GeV, respectively, where the first errors are statistical and the second systematic. Upper limits at the 90% confidence level of the Born cross sections are also reported at other 12 energy points.</p>
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8.
  • Ablikim, M., et al. (författare)
  • Study of D+ -&gt; K-pi(+)e(+)nu(e)
  • 2016
  • Ingår i: PHYSICAL REVIEW D. - 2470-0010. ; 94:3
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present an analysis of the decay D+ -&gt; K-pi(+)e(+)nu(e) based on data collected by the BESIII experiment at the psi(3770) resonance. Using a nearly background-free sample of 18262 events, we measure the branching fraction B(D+ -&gt; K-pi+e+nu e) = (3.77 +/- 0.03 +/- 0.08)%. For 0.8 &lt; m(K pi) &lt; 1.0 GeV/c(2), the partial branching fraction is B(D+ -&gt; K-pi+e+nu e)([0.8,1.0]) = (3.39 +/- 0.03 +/- 0.08)%. A partial wave analysis shows that the dominant (K) over bar* (892)degrees component is accompanied by an S-wave contribution accounting for (6.05 +/- 0.22 +/- 0.18)% of the total rate and that other components are negligible. The parameters of the (K) over bar* (892)degrees resonance and of the form factors based on the spectroscopic pole dominance predictions are also measured. We also present a measurement of the (K) over bar* (892)degrees helicity basis form factors in a model-independent way.</p>
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9.
  • Ablikim, M., et al. (författare)
  • Amplitude analysis of the π$^0$π$^0$ system produced in radiative J/ψ decays
  • 2016
  • Ingår i: PHYSICAL REVIEW D. - 2470-0010. ; 93:3
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>An amplitude analysis of the π0π0 system produced in radiative J/ψ decays is presented. In particular, a piecewise function that describes the dynamics of the π0π0 system is determined as a function of Mπ0π0 from an analysis of the (1.311±0.011)×109 J/ψ decays collected by the BESIII detector. The goal of this analysis is to provide a description of the scalar and tensor components of the π0π0 system while making minimal assumptions about the properties or number of poles in the amplitude. Such a model-independent description allows one to integrate these results with other related results from complementary reactions in the development of phenomenological models, which can then be used to directly fit experimental data to obtain parameters of interest. The branching fraction of J/ψ→γπ0π0 is determined to be (1.15±0.05)×10-3, where the uncertainty is systematic only and the statistical uncertainty is negligible.</p>
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10.
  • 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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