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Sökning: WFRF:(Johansson A. G. M.) > (2015-2019)

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  • Ablikim, M., et al. (författare)
  • Study of D+ -> 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>
  • Ablikim, M., et al. (författare)
  • Study of dynamics of D-0 -&gt; K(-)e(+)nu(e) and D-0 -&gt; pi(-)e(+)nu(e) decays
  • 2015
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 92:7
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>In an analysis of a 2.92 fb(-1) data sample taken at 3.773 GeV with the BESIII detector operated at the BEPCII collider, we measure the absolute decay branching fractions B(D-0 -&gt; K(-)e(+)nu(e)) = (3.505 +/- 0.014 +/- 0.033)% and B(D-0 -&gt; pi(-)e(+)nu(e)) = (0.295 +/- 0.004 +/- 0.003)%. From a study of the differential decay rates we obtain the products of hadronic form factor and the magnitude of the Cabibbo-Kobayashi-Maskawa (CKM) matrix element f(+)(K)(0)vertical bar V-cs vertical bar = 0.7172 +/- 0.0025 +/- 0.0035 and f(+)(pi)(0)vertical bar V-cd vertical bar = 0.1435 +/- 0.0018 +/- 0.0009. Combining these products with the values of vertical bar V-cs(d)vertical bar from the SM constraint fit, we extract the hadronic form factors f(+)(K)(0) = 0.7368 +/- 0.0026 +/- 0.0036 and f(+)(pi)(0) = 0.6372 +/- 0.0080 +/- 0.0044, and their ratio f(+)(pi)(0)/f(+)(K)(0) = 0.8649 +/- 0.0112 +/- 0.0073. These form factors and their ratio are used to test unquenched lattice QCD calculations of the form factors and a light cone sum rule (LCSR) calculation of their ratio. The measured value of f(+)(K(pi))(0)vertical bar V-cs(d)vertical bar and the lattice QCD value for f(+)(K(pi))(0) are used to extract values of the CKM matrix elements of vertical bar V-cs vertical bar = 0.9601 +/- 0.0033 +/- 0.0047 +/- 0.0239 and vertical bar V-cd vertical bar = 0.2155 +/- 0.0027 +/- 0.0014 +/- 0.0094, where the third errors are due to the uncertainties in lattice QCD calculations of the form factors. Using the LCSR value for f(+)(pi)(0)/f(+)(K)(0), we determine the ratio vertical bar V-cd vertical bar/vertical bar V-cs vertical bar = 0.238 +/- 0.004 +/- 0.002 +/- 0.011, where the third error is from the uncertainty in the LCSR normalization. In addition, we measure form factor parameters for three different theoretical models that describe the weak hadronic charged currents for these two semileptonic decays. All of these measurements are the most precise to date.</p>
  • Ablikim, M., et al. (författare)
  • Study of J/Psi -&gt; p(p)over-bar phi at BESIII
  • 2016
  • Ingår i: PHYSICAL REVIEW D. - 2470-0010. ; 93:5
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Using a data sample of 1.31×109 J/ψ events accumulated with the BESIII detector, the decay J/ψ→pp¯ϕ is studied via two decay modes, ϕ→KS0KL0 and ϕ→K+K-. The branching fraction of J/ψ→pp¯ϕ is measured to be B(J/ψ→pp¯ϕ)=[5.23±0.06(stat)±0.33(syst)]×10-5, which agrees well with a previously published measurement, but with a significantly improved precision. No evident enhancement near the pp¯ mass threshold, denoted as X(pp¯), is observed, and the upper limit on the branching fraction of J/ψ→X(pp¯)ϕ→pp¯ϕ is determined to be B(J/ψ→X(pp¯)ϕ→pp¯ϕ)&lt;2.1×10-7 at the 90% confidence level.</p>
  • Ablikim, M., et al. (författare)
  • Study of J/ψ and ψ(3686) decays to π<sup>+</sup>π<sup>−</sup>η′
  • 2017
  • Ingår i: Physical Review D : covering particles, fields, gravitation, and cosmology. - 2470-0010 .- 2470-0029. ; 96:11
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Using the data samples of 1.31×10<sup>9</sup>  J/ψ events and 4.48×10<sup>8</sup>  ψ(3686) events collected with the BESIII detector, partial wave analyses on the decays J/ψ and ψ(3686)→π+π−η′ are performed with a relativistic covariant tensor amplitude approach. The dominant contribution is found to be J/ψ and ψ(3686) decays to ρη′. In the J/ψ decay, the branching fraction B(J/ψ→ρη′) is determined to be (7.90±0.19(stat)±0.49(sys))×10<sup>−5</sup>. Two solutions are found in the ψ(3686) decay, and the corresponding branching fraction B(ψ(3686)→ρη′) is (1.02±0.11(stat)±0.24(sys))×10<sup>−5</sup> for the case of destructive interference, and (5.69±1.28(stat)±2.36(sys))×10<sup>−6</sup> for constructive interference. As a consequence, the ratios of branching fractions between ψ(3686) and J/ψ decays to ρη′ are calculated to be (12.9±1.4(stat)±3.1(sys))% and (7.2±1.6(stat)±3.0(sys))%, respectively. We also determine the inclusive branching fractions of J/ψ and ψ(3686) decays to π+π−η′ to be (1.36±0.02(stat)±0.08(sys))×10<sup>−4</sup> and (1.51±0.14(stat)±0.23(sys))×10<sup>−5</sup>, respectively</p>
  • Ablikim, M., et al. (författare)
  • Study of psi decays to the Xi(-)(Xi)over-bar(+) and Sigma(1385)(-/+)(Sigma)over-bar(1385)(+/-) final states
  • 2016
  • Ingår i: PHYSICAL REVIEW D. - 2470-0010. ; 93:7
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We study the decays of the charmonium resonances J/psi and psi(3686) to the final states Xi(-)(Xi) over bar (+), S(1385)(-/+)(Sigma) over bar (1385)(+/-) based on a single baryon tag method using data samples of (223.7 +/- 1.4) x 10(6) J/psi and (106.4 +/- 0.9) x 10(6) psi(3686) events collected with the BESIII detector at the BEPCII collider. The decay psi(3686) -&gt; Sigma(1385)(-/+)(Sigma) over bar (1385)(+/-) is observed for the first time, and the measurements of the other processes, including the branching fractions and angular distributions, are in good agreement with, and much more precise than, the previously published results. Additionally, the ratios B(psi(3686)-&gt;Xi(-)(Xi) over bar (+))/B(J/psi -&gt;Xi(-)(Xi) over bar (+)), B(psi(3686)-&gt;Sigma(1385)(-)(Sigma) over bar (1385)(+))/B(J/psi -&gt;Sigma(1385)(-)(Sigma) over bar (1385)(+)) and B(psi(3686)-&gt;Sigma(1385)(+)(Sigma) over bar (1385)(-))/B(J/psi -&gt;Sigma(1385)(+)(Sigma) over bar (1385)(-)) are detetmind</p>
  • Ablikim, M., et al. (författare)
  • Study of two-photon decays of pseudoscalar mesons via J/Psi radiative decays
  • 2018
  • Ingår i: Physical Review D : covering particles, fields, gravitation, and cosmology. - 2470-0010 .- 2470-0029. ; 97:7
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Using a sample of 4.48 x 10(8) Psi(3686) events collected with the BESIII detector at the BEPCII collider, we study the two-photon decays of the pseudoscalar mesons pi(0,) eta , eta' , eta(1405), eta(1475), eta(1760), and X(1835) in J/Psi radiative decays using Psi(3686) -&gt; pi(+) pi(-) J/Psi events. The pi(0), eta, and eta' mesons are clearly observed in the two-photon mass spectra, and the branching fractions are determined to be B(J/Psi -&gt; gamma pi(0) -&gt; 3 gamma) = (3.57 +/- 0.12 +/- 0.16) x 10(-5), B(J/Psi -&gt; gamma eta -&gt; 3 gamma) = (4.42 +/- 0.04 +/- 0.18) x 10(-4), and B(J/Psi -&gt; gamma eta' -&gt; 2 gamma) = (1.26 +/- 0.02 +/- 0.05) x 10(-4), where the first error is statistical and the second is systematic. No clear signal for eta(1405), eta(1475), eta(1760) or X(1835) is observed in the two- photon mass spectra, and upper limits at the 90% confidence level on the product branching fractions are obtained.</p>
  • Ablikim, M., et al. (författare)
  • Amplitude analysis of the pi(0)pi(0) system produced in radiative J/psi decays
  • 2015
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 92:5
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>An amplitude analysis of the pi(0)pi(0) system produced in radiative J/psi decays is presented. In particular, a piecewise function that describes the dynamics of the pi(0)pi(0) system is determined as a function of M pi(0)pi(0) from an analysis of the (1.311 +/- 0.011) x 10(9) J/psi decays collected by the BESIII detector. The goal of this analysis is to provide a description of the scalar and tensor components of the pi(0)pi(0) 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/psi -&gt; pi(0)pi(0) is determined to be (1.15 +/- 0.05) x 10(-3), where the uncertainty is systematic only and the statistical uncertainty is negligible.</p>
  • 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>
  • 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>
  • Ablikim, M., et al. (författare)
  • Measurement of the branching fraction for psi(3770) -&gt; gamma chi c0
  • 2016
  • Ingår i: Physics Letters B. - 0370-2693 .- 1873-2445. ; 753, s. 103-109
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>By analyzing a data set of 2.92 fb(-1) of e(+) e(-) collision data taken at root s = 3.773 GeVand 106.41 x 10(6) psi(3686) decays taken at root s = 3.686 GeVwith the BESIII detector at the BEPCII collider, we measure the branching fraction and the partial decay width for psi(3770)-&gt;gamma chi c0 to be B(psi(3770)-&gt;gamma chi c0) = (6.88 +/- 0.28 +/- 0.67) x 10(-3) and Gamma[psi(3770)-&gt;gamma chi c0] = (187 +/- 8 +/- 19) keV, respectively. These are the most precise measurements to date.</p>
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