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61.
  • Ablikim, M., et al. (författare)
  • Measurement of the branching fractions of D-s(+) -> eta ' X and D-s(+) -> eta 'rho(+) in e(+)e(-) -> 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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62.
  • Ablikim, M., et al. (författare)
  • Measurement of the matrix elements for the decays eta -&gt; pi(+)pi(-)pi(0) and eta/eta ' -&gt; pi(0)pi(0)pi(0)
  • 2015
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 92:1
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Based on a sample of 1.31 x 10(9) J/psi events collected with the BESIII detector at the BEPCII collider, Dalitz plot analyses of selected 79,625 eta -&gt; pi(+)pi(-)pi(0) events, 33,908 eta -&gt; pi(0)pi(0)pi(0) events, and 1,888 eta' -&gt; pi(0)pi(0)pi(0) events are performed. The measured matrix elements of eta -&gt; pi(+)pi(-)pi(0) are in reasonable agreement with previous measurements. The Dalitz plot slope parameters of eta -&gt; pi(0)pi(0)pi(0) and eta' -&gt; pi(0)pi(0)pi(0) are determined to be -0.055 +/- 0.014 +/- 0.004 and -0.640 +/- 0.046 +/- 0.047, respectively, where the first uncertainties are statistical and the second systematic. Both values are consistent with previous measurements, while the precision of the latter one is improved by a factor of 3. Final state interactions are found to have an important role in those decays.</p>
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63.
  • 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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64.
  • Ablikim, M., et al. (författare)
  • Observation and Spin-Parity Determination of the X(1835) in J/psi -&gt; gamma(KSKS0)-K-0 eta
  • 2015
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 115:9
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We report an observation of the process J/psi -&gt; gamma X(1835) -&gt; gamma(KSKS0)-K-0 eta at low (KSKS0)-K-0 mass with a statistical significance larger than 12.9s using a data sample of 1.31 x 109 J/psi events collected with the BESIII detector. In this region of phase space the (KSKS0)-K-0 system is dominantly produced through the f (0)(980). By performing a partial wave analysis, we determine the spin parity of the Xd1835_ to be J(PC) = 0(-+). The mass and width of the observed X(1835) are 1844 +/- 9(stat)(-25)(+16)(syst) MeV/c(2) and 192(-17)(+20)(sta)(-43)(+62)(syst) MeV, respectively, which are consistent with the results obtained by BESIII in the channel J/psi -&gt; gamma pi(+)pi(-)eta'.</p>
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65.
  • Ablikim, M., et al. (författare)
  • Observation of a Neutral Charmoniumlike State Z(c)(4025)(0) in e(+)e(-) -&gt; (D*(D)over-bar*)(0)pi(0)
  • 2015
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 115:18
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We report a study of the process e(+)e(-) -&gt; (D*(D) over bar*)(0)pi(0) using e(+)e(-) collision data samples with integrated luminosities of 1092 pb(-1) at root s = 4.23 GeV and 826 pb(-1) at root s = 4.26 GeV collected with the BESIII detector at the BEPCII storage ring. We observe a new neutral structure near the (D*(D) over bar*)(0) mass threshold in the pi(0) recoil mass spectrum, which we denote as Z(c)(4025)(0). Assuming a Breit-Wigner line shape, its pole mass and pole width are determined to be (4025.5(-4.7)(+2.0) +/- 3.1) MeV/c(2) and (23.0 +/- 6.0 +/- 1.0) MeV, respectively. The Born cross sections of e(+)e(-) -&gt; Z(c)(4025)(0)pi(0) -&gt; (D*(D) over bar*)(0)pi(0) are measured to be (61.6 +/- 8.2 +/- 9.0) pb at root s = 4.23 GeV and (43.4 +/- 8.0 +/- 5.4) pb at root s = 4.26 GeV. The first uncertainties are statistical and the second are systematic.</p>
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66.
  • Ablikim, M., et al. (författare)
  • Observation of pseudoscalar and tensor resonances in J/psi -&gt; gamma phi phi
  • 2016
  • Ingår i: PHYSICAL REVIEW D. - 2470-0010. ; 93:11
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Based on a sample of (1310.6 +/- 10.5) x 10(6) J/psi events collected with the BESIII detector operating at the BEPCII storage ring, a partial wave analysis of the decay J/psi -&gt; gamma phi phi is performed in order to study the intermediate states. Results of the partial wave analysis show that the structures are predominantly 0(-+) states. The existence of the eta(2225) is confirmed, and its resonance parameters are measured. Two additional pseudoscalar states, the eta(2100) with a mass of 2050(-24-26)(+30+75) MeV/c(2) and a width of 250(-30-164)(+36+181) MeV/c(2) and the X(2500) with a mass of 2470(-19-23)(+15+101) MeV/c(2) and a width of 230(-35-33)(+64+56) MeV/c(2), are observed. In addition to these three pseudoscalar states, the scalar state f(0)(2100), and three tensor states, the f(2)(2010), f(2)(2300) and f(2)(2340), are observed in the process J/psi -&gt; gamma phi phi The product branching fractions B(J/psi -&gt; gamma X) x B(X -&gt; phi phi) are reported.</p>
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67.
  • Ablikim, M., et al. (författare)
  • Observation of Z(c)(3900)(0) in e(+)e(-) -&gt; pi(0)pi(0) J/Psi
  • 2015
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 115:11
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Using a data sample collected with the BESIII detector operating at the BEPCII storage ring, we observe a new neutral state Z(c)(3900)(0) with a significance of 10.4 sigma. The mass and width are measured to be 3894.8 +/- 2.3 +/- 3.2 MeV/c(2) and 29.6 +/- 8.2 +/- 8.2 MeV, respectively, where the first error is statistical and the second systematic. The Born cross section for e(+)e(-) -&gt; pi(0)pi(0) J/Psi and the fraction of it attributable to pi(0)Z(c)(3900)(0) -&gt; pi(0)pi(0) J/Psi in the range E-c.m. = 4.19-4.42 GeV are also determined. We interpret this state as the neutral partner of the four-quark candidate Z(c)(3900)(+/-).</p>
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68.
  • Ablikim, M., et al. (författare)
  • Search for the rare decays D -&gt; h(h((')))e(+) e(-)
  • 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 search for rare decays of D mesons to hadrons accompanied by an electron-positron pair (h(h((')))e(+)e(- )),using an e(+)e(-) collision sample corresponding to an integrated luminosity of 2.93 fb(-1) collected with the BESIII detector at root s = 3.773 GeV. No significant signals are observed, and the corresponding upper limits on the branching fractions at the 90% confidence level are determined. The sensitivities of the results are at the level of 10(-5)-10(-6), providing a large improvement over previous searches.</p>
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69.
  • 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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70.
  • Ablikim, M., et al. (författare)
  • Search for Z(c)(3900)(+/-) -&gt; omega pi(+/-)
  • 2015
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 92:3
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>The decay Z(c)(3900)(+/-) -&gt; omega pi(+/-) is searched for using data samples collected with the BESIII detector operating at the BEPCII storage ring at center-of-mass energies root s = 4.23 and 4.26 GeV. No significant signal for the Z(c)(3900)(+/-) is found, and upper limits at the 90% confidence level on the Born cross section for the process e(+)e(-) -&gt; Z(c)(3900)(+/-) pi(-/+) -&gt; omega pi(+)pi(-) are determined to be 0.26 and 0.18 pb at root s = 4.23 and 4.26 GeV, respectively.</p>
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