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1.
  • Ablikim, M., et al. (författare)
  • Confirmation of a charged charmoniumlike state Z(c)(3885)(-/+) in e(+)e(-) -> pi(+/-) (D(D)over-bar*)(-/+) with double D tag
  • 2015
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 92:9
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present a study of the process e(+)e(-) -&gt; pi(+/-) (D (D) over bar*)(-/+) using data samples 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. With full reconstruction of the D meson pair and the bachelor pi(+) in the final state, we confirm the existence of the charged structure Z(c) (3885)(-/+) in the (D (D) over bar*)(-/+) system in the two isospin processes e(+)e(-) -&gt; pi(+DD)-D-0*(-) and e(+)e(-) -&gt; pi+D-D*(0). By performing a simultaneous fit, the statistical significance of Zc(3885)(-/+) signal is determined to be greater than 10 sigma, and its pole mass and width are measured to be M-pole = (3881.7 +/- 1.6(stat) +/- 1.6(syst)) MeV/c(2) and Gamma(pole) = (26.6 +/- 2.0(stat) +/- 2.1(syst)) MeV, respectively. The Born cross section times the (D (D) over bar*)(-/+) branching fraction (sigma(e(+)e(-) -&gt; pi(+/-)Z(c)(3885)(-/+)) x Br(Z(c)(3885)(-/+) -&gt; (D (D) over bar*)(-/+) )) is measured to be (141.6 +/- 7.9(stat) +/- 12.3(syst)) pb at root s = 4.23 GeV and (108.4 +/- 6.9(stat) +/- 8.8(syst)) pb at root s = 4.26 GeV. The polar angular distribution of the pi(+) - Z(c)(3885)(-/+) system is consistent with the expectation of a quantum number assignment of J(P) = 1(+) for Z(c)(3885)(-/+).</p>
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2.
  • Ablikim, M., et al. (författare)
  • Determination of the Spin and Parity of the Z(c)(3900)
  • 2017
  • Ingår i: Physical Review Letters. - AMER PHYSICAL SOC. - 0031-9007 .- 1079-7114. ; 119:7
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>The spin and parity of the Z(c)(3900)(+/-) state are determined to be J(P) = 1(+) with a statistical significance larger than 7 sigma over other quantum numbers in a partial wave analysis of the process e(+)e(-) -&gt; pi(+)pi(-) J/psi We use a data sample of 1.92 fb(-1) accumulated at root s = 4.23 and 4.26 GeV with the BESIII experiment. When parametrizing the Z(c)(3900)(+/-) with a Flatte-like formula, we determine its pole mass M-pole = (3881.2 +/- 4.2(stat) +/- 52.7(syst)) MeV/c(2) and pole width Gamma(pole) = (51.8 +/- 4.6(stat) +/- 36.0(syst)) MeV. We also measure cross sections for the process e(+)e(-) -&gt; Z(c)(3900)(+)pi(-) + c.c. -&gt; J/psi pi(+)pi(-) and determine an upper limit at the 90% confidence level for the process e(+)e(-) -&gt; Z(c)(4020)(+)pi(-) + c.c. -&gt; J/psi pi(+)pi(-).</p>
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3.
  • Ablikim, M., et al. (författare)
  • Measurement of the absolute branching fraction of D+ → K̅0 e+νe via K̅0 → π 0 π 0
  • 2016
  • Ingår i: Chinese Physics C, High Energy Physics & Nuclear Physics. - 1674-1137 .- 0899-9996. ; 40:11
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>By analyzing 2.93 fb(-1) data collected at the center-of-mass energy root s = 3.773 GeV with the BESIII detector, we measure the absolute branching fraction of the semileptonic decay D+ -&gt; (K) over bar (0)e(+)nu(e) to be B(D (+) -&gt; (K) over bar (0)e(+)nu(e)) = (8.59 +/- 0.14 +/- 0.21)% using (K) over bar (0) -&gt; K-S(0) -&gt; pi(0) pi(0), where the first uncertainty is statistical and the second systematic. Our result is consistent with previous measurements within uncertainties..</p>
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4.
  • 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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5.
  • 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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6.
  • Ablikim, M., et al. (författare)
  • Improved measurement of the absolute branching fraction of D+ -&gt; (K)over-bar(0)mu(+)nu(mu)
  • 2016
  • Ingår i: European Physical Journal C. - SPRINGER. - 1434-6044 .- 1434-6052. ; 76:7
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>By analyzing 2.93 fb(-1) of data collected at root s = 3.773 GeV with the BESIII detector, we measure the absolute branching fraction B(D+ -&gt; (K) over bar (0) (+)(mu)nu(mu)) = (8.72 +/- 0.07(stat). +/- 0.18(sys).) %, which is consistent with previous measurements within uncertainties but with significantly improved precision. Combining the Particle Data Group values of B(D-0 -&gt; K- mu(+)nu(mu)), B(D+-&gt; (K) over bar (0)e(+)nu(e)), and the lifetimes of the D-0 and D+ mesons with the value of B(D+ -&gt; (K) over bar (0)mu(+)nu(mu)) measured in this work, we determine the following ratios of partial widths: Gamma (D-0 -&gt; (K) over bar (-)mu(+)nu(mu))/Gamma (D+ -&gt; (K) over bar (0)mu+nu(mu)) = 0.963 +/- 0.044 and Gamma (D+ -&gt; (K) over bar (0) mu+nu(mu))/Gamma(D+ -&gt; (K) over bar (0)e+nu(e)) = 0.988 +/- 0.033.</p>
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7.
  • Ablikim, M., et al. (författare)
  • Improved measurements of branching fractions for eta(c) -&gt; phi phi and omega phi
  • 2017
  • Ingår i: Physical Review D : covering particles, fields, gravitation, and cosmology. - AMER PHYSICAL SOC. - 2470-0010 .- 2470-0029. ; 95:9
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Using (223.7 +/- 1.4) x 10(6) J / Psi events accumulated with the BESIII detector, we study eta(c) decays to phi phi and omega phi final states. The branching fraction of n(c) -&gt; phi phi is measured to be Br(eta(c) -&gt; phi phi) = (2.5 +/- 0(-0.7)(+0.3) +/- 0.6) X 10(-3,) where the first uncertainty is statistical, the second is systematic, and the third is from the uncertainty of Br(J / Psi -&gt; gamma eta(C)). No significant signal for the double Okubo-Zweig-Iizuka suppressed decay of eta(c) -&gt; omega phi is observed, and the upper limit on the branching fraction is determined to be Br(eta(c) -&gt; omega phi) &lt; 2.5 x 10(-4) at the 90% confidence level.</p>
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8.
  • Ablikim, M., et al. (författare)
  • Measurement of the Ds&lt;(+)-&gt; l(+)ve branching fractions and the decay constant fDs
  • 2016
  • Ingår i: PHYSICAL REVIEW D. - 2470-0010. ; 94:7
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Using 482 pb(-1) of e(+) e(-) collision data collected at a center-of-mass energy of root s = 4.009 GeV with the BESIII detector, we measure the branching fractions of the decays D-s(+) -&gt; u(+)v(u) and D-s(+) -&gt; tau(+)v(tau). By constraining the ratio of decay rates of Ds(+) to tau(+)v(u) and to u(+)v(u) to the Standard Model prediction, the branching fractions are determined to be B(D-s(+) -&gt; u(+)v(u) = (0.495 +/- 0.067 +/- 0.026)% and B(D-s(+) -&gt; tau(+)v(tau) = (4.83 +/- 0.65 +/- 0.26)% Using these branching fractions, we obtain a value for the decay constant f(Ds+) of (241.0 +/- 16.3 +/- 6.5) MeV, where the first error is statistical and the second systematic.</p>
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9.
  • Ablikim, M., et al. (författare)
  • Observation of e(+)e(-) -&gt; omega chi(c1,2) near root s=4.42 and 4.6 GeV
  • 2016
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 93:1
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Based on data samples collected with the BESIII detector operating at the BEPCII storage ring at center-of-mass energies root s &gt; 4.4 GeV, the processes e(+)e(-) -&gt; omega chi(c1,2) are observed for the first time. With an integrated luminosity of 1074 pb(-1) near root s = 4.42 GeV, a significant omega chi(c2) signal is found, and the cross section is measured to be (20.9 +/- 3.2 +/- 2.5) pb. With 567 pb(-1) near root s = 4.6 GeV, a clear omega chi(c2) signal is seen, and the cross section is measured to be (9.5 +/- 2.1 +/- 1.3) pb, while evidence is found for an omega chi(c2) signal. The first errors are statistical, and the second are systematic. Due to low luminosity or low cross section at other energies, no significant signals are observed. In the omega chi(c2) cross section, an enhancement is seen around root s = 4.42 GeV. Fitting the cross section with a coherent sum of the psi(4415) Breit-Wigner function and a phase-space term, the branching fraction B(psi(4415) -&gt; omega chi(c2)) is obtained to be of the order of 10(-3).</p>
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10.
  • Ablikim, M., et al. (författare)
  • Study of decay dynamics and CP asymmetry in D+ -&gt; K(L)(0)e(+)nu(e) decay
  • 2015
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 92:11
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Using 2.92 fb(-1) of electron-positron annihilation data collected at root s = 3.773 GeV with the BESIII detector, we obtain the first measurements of the absolute branching fraction B(D+ -&gt; K(L)(0)e(+)nu(e)) = (4.481 +/- 0.027(stat) +/- 0.103(sys))% and the CP asymmetry A(CP)(D+-&gt; KL0e+nu e) = (-0.59 +/- 0.60(stat) +/- 1.48(sys))%. From the D+ -&gt; K(L)(0)e(+)nu(e) differential decay rate distribution, the product of the hadronic form factor and the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element, f(+)(K)(0)vertical bar V-cs vertical bar, is determined to be 0.728 +/- 0.006(stat) +/- 0.011(sys). Using vertical bar V-cs vertical bar from the SM constrained fit with the measured f(+)(K)(0)vertical bar V-cs vertical bar, f(+)(K)(0) = 0.748 +/- 0.007(stat) +/- 0.012(sys) is obtained, and utilizing the unquenched Lattice QCD (LQCD) calculation for f(+)(K)(0), vertical bar V-cs vertical bar = 0.975 +/- 0.008(stat) +/- 0.015(sys) +/- 0.025(LQCD).</p>
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