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Sökning: WFRF:(Sun Xiao Feng) > (2015-2019)

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11.
  • Ablikim, M., et al. (författare)
  • Study of J/ψ and ψ(3686) decay to Λ¯Λ and Σ0¯Σ0 final states
  • 2017
  • Ingår i: Physical Review D : covering particles, fields, gravitation, and cosmology. - 2470-0010 .- 2470-0029. ; 95:5
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Using 1310.6 x 10(6) J/psi and 447.9 x 10(6) psi (3686) events collected with the BESIII detector at the BEPCII e(+)e(-) collider, the branching fractions and the angular distributions of J/psi and psi (3686) decays to Lambda(Lambda) over bar and Sigma(0)(Sigma) over tilde (0) final states are measured. The branching fractions are determined, with much improved precision, to be 19.43 +/- 0.03 +/- 0.33, 11.64 +/- 0.04 +/- 0.23, 3.97 +/- 0.02 +/- 0.12 and 2.44 +/- 0.03 +/- 0.11 for J/psi -&gt; Lambda(Lambda) over bar -&gt; Sigma(0)(Sigma) over tilde (0) , psi (3686) -&gt; Lambda(Lambda) over bar and psi (3686) -&gt; Sigma(0)(Sigma) over tilde (0), respectively. The polar angular distributions of psi (3686) decays are measured for the first time, while those of J/psi decays are measured with much improved precision. In addition, the ratios of branching fractions B(psi(3686)-&gt;Lambda(Lambda) over bar)/B(J/psi -&gt; Lambda(Lambda) over bar) and B(psi(3686)-&gt;Sigma(0)(Sigma) over tilde (0))/B(J/psi -&gt;Sigma(0)(Sigma) over tilde (0)) are determined to test the "12% rule."</p>
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12.
  • Ablikim, M., et al. (författare)
  • Branching fraction measurements of psi (3686) -&gt; gamma chi(cJ)
  • 2017
  • Ingår i: Physical Review D : covering particles, fields, gravitation, and cosmology. - 2470-0010 .- 2470-0029. ; 96:3
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Using a sample of 106 million psi(3686) decays, the branching fractions of psi(3686) -&gt; gamma chi(c0), psi(3686) -&gt; gamma chi(c1), and psi(3686) -&gt; gamma chi(c2) are measured with improved precision to be (9.389 +/- 0.014 +/- 0.332) %, (9.905 +/- 0.011 +/- 0.353) %, and (9.621 +/- 0.013 +/- 0.272) %, respectively, where the first uncertainties are statistical and the second ones are systematic. The product branching fractions of (psi 3686) -&gt; gamma chi(c1), chi(c1) -&gt; gamma J/psi (3686) -&gt; gamma chi(c2), chi(c2) -&gt; gamma J/psi and the branching fractions of chi(c1) -&gt; gamma J/psi and chi(c2) -&gt; gamma J/psi are also presented.</p>
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13.
  • 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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14.
  • Ablikim, M., et al. (författare)
  • Measurement of e(+)e(-) -&gt; K(K)over-barJ/psi cross sections at center-of-mass energies from 4.189 to 4.600 GeV
  • 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>We investigate the process e(+)e(-) -&gt; K (K) over barJ/psi at center-of-mass energies from 4.189 to 4.600 GeV using 4.7 fb(-1) of data collected by the BESIII detector at the BEPCII collider. The Born cross sections for the reactions e(+)e(-) -&gt; K(+)K(-)J/psi and K(S)(0)K(S)(0)J/psi are measured as a function of center-of-mass energy. The energy dependence of the cross section for e(+)e(-) -&gt; K(+)K(-)J/psi is shown to differ from that for pi(+)pi(-)J/psi in the region around the Y(4260). In addition, there is evidence for a structure around 4.5 GeV in the e(+)e(-) -&gt; K(+)K(-)J/psi cross section that is not present in pi(+)pi(-)J/psi.</p>
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15.
  • Ablikim, M., et al. (författare)
  • Measurement of e+e−→π0π0ψ(3686) at √s from 4.009 to 4.600 GeV and observation of a neutral charmoniumlike structure
  • 2018
  • Ingår i: Physical Review D : covering particles, fields, gravitation, and cosmology. - 2470-0010 .- 2470-0029. ; 97:5
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Using ethorne-collision data collected with the BESIII detector at the BEPCII collider corresponding to an integrated luminosity of 5.2 fb(-1) at center-of-mass energies (root s) from 4.009 to 4.600 GeV, the process e(+)e(-) -&gt; pi(0)pi(0)psi(3686) is studied for the first time. The corresponding Born cross sections are measured and found to be half of those of the reaction e(+)e(-) -&gt; pi(0)pi(0)psi(3686). This is consistent with the expectation from isospin symmetry. Furthermore, the Dalitz plots for pi(0)pi(0)psi(3686) are accordant with those of pi(0)pi(0)psi(3686) at all energy points, and a neutral analog to the structure in pi(+/-)psi(3686) around 4040 MeV/c(2) first observed at root s = 4.416 GeV is observed in the isospin neutral mode at the same energy.</p>
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16.
  • 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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17.
  • Ablikim, M., et al. (författare)
  • Observation of the decay Lambda(+)(c) -&gt; Sigma(-)pi(+)pi(+)pi(0)
  • 2017
  • Ingår i: Physics Letters B. - 0370-2693 .- 1873-2445. ; 772, s. 388-393
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We report the first observation of the decay Lambda(+)(c) -&gt; Sigma(-)pi(+)pi(+)pi(0), based on data obtained in e(+)e(-) annihilations with an integrated luminosity of 567 pb(-1) at vs = 4.6 GeV. The data were collected with the BESIII detector at the BEPCII storage rings. The absolute branching fraction B(Lambda(+)(c) -&gt; Sigma(-)pi(+)pi(+)pi(0)) is determined to be (2.11 +/- 0.33(stat.) +/- 0.14(syst.))%. In addition, an improved measurement of B(Lambda(+)(c) -&gt; Sigma(-)pi(+)pi(+)pi(0)) is determined as (1.81 +/- 0.17(stat.) +/- 0.09(syst.))%.</p>
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18.
  • Ablikim, M., et al. (författare)
  • Observation of ψ(3686)→n¯n and improved measurement of ψ(3686)→p¯p
  • 2018
  • Ingår i: Physical Review D : covering particles, fields, gravitation, and cosmology. - AMER PHYSICAL SOC. - 2470-0010 .- 2470-0029. ; 98:3
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We observe the decay psi (3686) -&gt; n (n) over bar for the first time and measure psi (3686) -&gt; p (p) over bar with improved accuracy by using 1.07 x 10(8) psi (3686) events collected with the BESIII detector. The measured branching fractions are B(psi(3686) -&gt; n (n) over bar) = (3.06 +/- 0.06 +/- 0.14) x 10(-4) and B(psi(3686) -&gt; p (p) over bar) = (3.05 +/- 0.02 +/- 0.12) x 10(-4). Here, the first uncertainties are statistical, and the second ones are systematic. With the hypothesis that the polar angular distributions of the neutron and proton in the center-of-mass system obey 1 + alpha cos(2) theta, we determine the a parameters to be alpha(n (n) over bar) = 0.68 +/- 0.12 +/- 0.11 and alpha(p (p) over bar) = 1.03 +/- 0.06 +/- 0.03 for psi(3686) -&gt; n (n) over bar and psi(3686) -&gt; p (p) over bar, respectively.</p>
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19.
  • Ablikim, M., et al. (författare)
  • Search for the rare decays J/ψ→D<sup>0</sup>e+e−+c.c. and ψ(3686)→D<sup>0</sup>e+e−+c.c.
  • 2017
  • Ingår i: BESIII Collaboration.
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Using the data samples of (1310.6 +/- 7.2) x 10(6) J/psi events and (448.1 +/- 2.9) x 10(6) psi(3686) events collected with the BESIII detector, we search for the rare decays J/psi -&gt; D(0)e(+) e(-) + c.c. and psi(3686) -&gt; D(0)e(+) e(-) + c.c. No significant signals are observed and the corresponding upper limits on the branching fractions at the 90% confidence level are determined to be B(J/psi -&gt; D(0)e(+) e(-) + c.c.) &lt; 8.5 x 10(-8) and B(psi(3686) -&gt; D(0)e(+) e(-) + c.c.) &lt; 1.4 x 10(-7), respectively. Our limit on B(J/psi -&gt; D(0)e(+) e(-) + c.c.) is more stringent by 2 orders of magnitude than the previous results, and B(psi(3686) -&gt; D(0)e(+) e(-) + c.c.) is measured for the first time.</p>
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20.
  • Ablikim, M., et al. (författare)
  • Study of the decays D+-&gt; eta(('))e(+)nu(e)
  • 2018
  • Ingår i: Physical Review D : covering particles, fields, gravitation, and cosmology. - AMER PHYSICAL SOC. - 2470-0010 .- 2470-0029. ; 97:9
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>The charm semileptonic decays D+ -&gt; eta e(+)nu(e) and D+ -&gt; eta'e(+)nu(e) are studied with a sample of e(+)e(-) collision data corresponding to an integrated luminosity of 2.93 fb(-1) collected at root s = 3.773 GeV with the BESIII detector. We measure the branching fractions for D+ -&gt; eta e(+)upsilon(e) to be (10.74 +/- 0.81 +/- 0.51)x10(-4), and for D+ -&gt; eta'e(+)nu(e) to be (1.91 +/- 0.51 +/- 0.13) x 10(-4), where the uncertainties are statistical and systematic, respectively. In addition, we perform a measurement of the form factor in the decay D+ -&gt; eta e(+)nu(e) . All the results are consistent with those obtained by the CLEO-c experiment.</p>
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