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1.
  • Ablikim, M., et al. (författare)
  • Amplitude analysis of the chi(c1) -> 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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2.
  • 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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3.
  • Ablikim, M., et al. (författare)
  • Observation of the Semileptonic Decay D-0 -&gt; a(0)(980)(-)e(+)nu(e) and Evidence for D+ -&gt; a(0)(980)(0)e(+)nu(e)
  • 2018
  • Ingår i: Physical Review Letters. - AMER PHYSICAL SOC. - 0031-9007 .- 1079-7114. ; 121:8
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Using an e(+)e(-) collision data sample of 2.93 fb(-1) collected at a center-of-mass energy of 3.773 GeV by the BESIII detector at BEPCII, we report the observation of D-0 -&gt; a(0)(980)(-)e(+)nu(e) and evidence for D+ -&gt; a(0)(980)(0)e(+)nu(e) with significances of 6.4 sigma and 2.9 sigma, respectively. The absolute branching fractions are determined to be B(D-0 -&gt; a(0)(980)(-)e(+)nu(e)) x B(a(0)(980)(-) -&gt; eta pi(-)) = [1.33(-0.29)(+0.33)(stat) +/- 0.09(syst)] x 10(-4) and B(D+ -&gt; a(0)(980)(0)e(+)nu(e)) x B(a(0)(980)(0) -&gt; eta pi(0)) = [1.66(-0.66)(+0.81)(stat) +/- 0.11(syst) x 10(-4). This is the first time the a(0)(980) meson has been measured in a D-0 semileptonic decay, which would open one more interesting page in the investigation of the nature of the puzzling a(0)(980) states.</p>
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4.
  • 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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5.
  • Ablikim, M., et al. (författare)
  • First measurement of e(+)e(-) -&gt; pK(S)(0)(n)over-barK(-) + c.c. above open charm threshold
  • 2018
  • Ingår i: Physical Review D : covering particles, fields, gravitation, and cosmology. - 2470-0010 .- 2470-0029. ; 98:3
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>The process e(+)e(-) -&gt; pK(S)(0)(n) over barK(-) + c.c. and its intermediate processes are studied for the first time, using data samples collected with the BESIII detector at BEPCII at center-of-mass energies of 3.773, 4.008, 4.226, 4.258, 4.358, 4.416, and 4.600 GeV, with a total integrated luminosity of 7.4 fb(-1). The Born cross section of e(+)e(-) -&gt; pK(S)(0)(n) over barK(-) + c.c. is measured at each center-of-mass energy, but no significant resonant structure in the measured cross-section line shape between 3.773 and 4.600 GeV is observed. No evident structure is detected in the pK(-), nK(S)(0), pK(S)(0), nK(+), p (n) over bar, or (KSK-)-K-0 invariant mass distributions except for Lambda(1520). The Born cross sections of e(+)e(-) -&gt; Lambda(1520)(n) over barK(S)(0) + c.c. and e(+)e(-) -&gt; Lambda(1520)(p) over barK(+) + c.c. are measured, and the 90% confidence level upper limits on the Born cross sections of e(+)e(-) -&gt; Lambda(1520)(Lambda) over bar (1520) are determined at the seven center-of-mass energies. There is an evident difference in line shape and magnitude of the measured cross sections between e(+)e(-) -&gt; Lambda(1520)(-&gt; pK(-))(n) over barK(S)(0) and e(+)e(-) -&gt; pK-(Lambda) over bar (1520)(-&gt; (n) over barK(S)(0)).</p>
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6.
  • Ablikim, M., et al. (författare)
  • Measurements of cross section of e(+)e(-) -&gt; p(p)over-bar pi(0) at center-of-mass energies between 4.008 and 4.600 GeV
  • 2017
  • Ingår i: Physics Letters B. - ELSEVIER SCIENCE BV. - 0370-2693 .- 1873-2445. ; 771, s. 45-51
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Based on e(+)e(-) annihilation data samples collected with the BESIII detector at the BEPCII collider at 13 center-of-mass energies from 4.008 to 4.600 GeV, measurements of the Born cross section of e(+)e(-) -&gt; p (p) over bar pi(0) are performed. No significant resonant structure is observed in the measured energy dependence of the cross section. The upper limit on the Born cross section of e(+)e(-) -&gt; Y (4260) -&gt; p (p) over bar pi(0) at the 90% C. L. is determined to be 0.01 pb. The upper limit on the ratio of the branching fractions B(Y(4260) -&gt; p (p) over bar pi(0))/B(Y(4260) -&gt; pi(+)pi(-) j/Psi) at the 90% C. L. is determined to be 0.02%.</p>
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7.
  • 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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8.
  • Ablikim, M., et al. (författare)
  • Measurements of the branching fractions for D+ -&gt; (KSKSK+)-K-0-K-0+, (KSKS0)-K-0 pi + and D-0 -&gt; (KSKS0)-K-0, (KSKSKS0)-K-0-K-0
  • 2017
  • Ingår i: Physics Letters B. - 0370-2693 .- 1873-2445. ; 765, s. 231-237
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>By analyzing 2.93 fb(-1) of data taken at the psi(3770) resonance peak with the BESIII detector, we measure the branching fractions for the hadronic decays D+ -&gt; (KSKSK+)-K-0-K-0, D+ -&gt; (KSKS0)-K-0 pi(+), D-0 -&gt; (KSKS0)-K-0 and D-0 -&gt; (KSKSKS0)-K-0-K-0.They are determined to be B(D+ -&gt; (KSKSK+)-K-0-K-0) = (2.54 +/- 0.05(stat.) +/- 0.12(sys.))x 10(-3), B(D+ -&gt; (KSKS0)-K-0 pi(+)) = (2.70 +/- 0.05(stat,) +/- 0.12(sys.)) x 10(-3), B(D+ -&gt; (KSKS0)-K-0) = (1.67 +/- 0.11(stat.) +/- 0.11(sys.)) x 10(-4) and B(D+ -&gt; (KSKSKS0)-K-0-K-0) = (7.21 +/- 0.33(stat.) +/- 0.44(sys,)) x 10(-4), where the second one is measured for the first time and the others are measured with significantly improved precision over the previous measurements.</p>
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9.
  • 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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10.
  • 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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