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1.
  • Ablikim, M., et al. (författare)
  • Observation of e(+)e(-) -> gamma X(3872) at BESIII
  • 2014
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 112:9, s. 092001
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>With data samples collected with the BESIII detector operating at the BEPCII storage ring at center-of-mass energies from 4.009 to 4.420 GeV, the process e(+)e(-) -&gt; gamma X(3872) is observed for the first time with a statistical significance of 6.3 sigma. The measured mass of the X(3872) is (3871.9 +/- 0.7(stat) +/- 0.2(syst)) MeV/c(2), in agreement with previous measurements. Measurements of the product of the cross section sigma[e(+)e(-) -&gt; gamma X(3872)] and the branching fraction B [X(3872) -&gt; pi(+)pi(-)J/psi] at center-of-mass energies 4.009, 4.229, 4.260, and 4.360 GeV are reported. Our measurements are consistent with expectations for the radiative transition process Y(4260) -&gt; gamma X(3872).</p>
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2.
  • Ablikim, M., et al. (författare)
  • Observation of the decay psi(3686) -&gt; Lambda(Sigma)over-bar(+/-) pi(-/+) + c.c
  • 2013
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 88:11, s. 112007
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Using a sample of 1:06 X 10(8) psi(3686) events collected with the BESIII detector, we present the first observation of the decays of psi(3686) -&gt; Lambda(Sigma) over bar (+) pi(-) + c.c. and psi(3686) -&gt; Lambda(Sigma) over bar (-) pi(+) + c.c. The branching fractions are measured to be B(psi(3686) -&gt; Lambda(Sigma) over bar (+) pi(-) + c.c.) = (1.40 +/- 0.03 +/- 0.13) X 10(-4) and B(psi(3686) -&gt; Lambda (Sigma) over bar (-) pi(+) + c.c.) = (1.54 +/- 0.04 +/- 0.13) X 10(-4) where the first errors are statistical and the second ones systematic.</p>
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3.
  • Ablikim, M., et al. (författare)
  • Measurement of chi(cJ) decaying into eta ' K+K-
  • 2014
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 89:7, s. 074030
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Using (106.41 +/- 0.86) x 10(6) Psi(3686) events collected with the BESIII detector at BEPCII, we study for the first time the decay chi(cJ) -&gt; eta'K+K- (J = 1, 2), where eta' -&gt; gamma rho(0) and eta' -&gt; eta pi(+)pi(-). A partial wave analysis in the covariant tensor amplitude formalism is performed for the decay chi(c1) -&gt; eta'K+K-. Intermediate processes chi(c1) -&gt; eta'f(2)'(1525) chi(c1) -&gt; K-0*(1430)K-+/-(-/+) (K-0*(1430)(+/-) -&gt; eta'K-+/-) are observed with statistical significances larger than 5 sigma, and their branching fractions are measured.</p>
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4.
  • Ablikim, M., et al. (författare)
  • Observation of Lambda(+)(c) -&gt; nK(S)(0)pi(+)
  • 2017
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 118:11
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We report the first direct measurement of decays of the Lambda(+)(c) baryon involving the neutron. The analysis is performed using 567 pb(-1) of e(+)e(-) collision data collected at root s = 4.599 GeV with the BESIII detector at the BEPCII collider. We observe the decay Lambda(+)(c) -&gt; nK(S)(0)pi(+) and measure the absolute branching fraction to be B(Lambda(+)(c) -&gt; nK(S)(0)pi(+)) = [1.82 +/- 0.23(stat) +/- 0.11(syst)]%. A comparison to B[Lambda(+)(c) -&gt; p( (K) over bar pi)(0)] provides an important test of isospin symmetry and final state interactions.</p>
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5.
  • Ablikim, M., et al. (författare)
  • Precision measurement of the mass of the tau lepton
  • 2014
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 90:1
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>An energy scan near the tau pair production threshold has been performed using the BESIII detector. About 24 pb(-1) of data, distributed over four scan points, were collected. This analysis is based on t pair decays to ee, e mu, eh, h, hh, e.,. and p. final states, where h denotes a charged p or K. The mass of the t lepton is measured from a maximum likelihood fit to the t pair production cross- section data to be m(tau) = 1776.91 +/- 0.12_0.10 - 0.13 _ MeV/c(2), which is currently the most precise value in a single measurement.</p>
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6.
  • Ablikim, M., et al. (författare)
  • Search for C-parity violation in J/psi -&gt; gamma gamma and gamma phi
  • 2014
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 90:9, s. 092002
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Using 1.06 x 10(8) psi(3686) events recorded in e(+)e(-) collisions at root s = 3.686 GeV with the BESIII at the BEPCII collider, we present searches for C-parity violation in J/psi -&gt; gamma gamma and gamma phi decays via psi(3686) -&gt; J/psi pi(+)pi(-). No significant signals are observed in either channel. Upper limits on the branching fractions are set to be B(J/psi -&gt; gamma gamma) &lt; 2.7 x 10(-7) and B(J/psi -&gt; gamma phi) &lt; 1.4 x 10(-6) at the 90% confidence level. The former is one order of magnitude more stringent than the previous upper limit, and the latter represents the first limit on this decay channel.</p>
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7.
  • Ablikim, M., et al. (författare)
  • Search for eta(c)(2S)h(c) -&gt; p(p)over-bar decays and measurements of the chi(cJ) -&gt; p(p)over-bar branching fractions
  • 2013
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 88:11, s. 112001
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Using a sample of 1.06 x 10(8)psi(3686) events collected with the BESIII detector at BEPCII, the decays eta(c)(2S) -&gt; p (p) over bar and h(c) -&gt; p (p) over bar are searched for, where eta(c)(2S) and h(c) are reconstructed in the decay chains psi(3686) -&gt; gamma eta(c)(2S), eta(c)(2S) -&gt; p (p) over bar and psi(3686) -&gt; pi(0)h(c), h(c) -&gt; p (p) over bar, respectively. No significant signals are observed. The upper limits of the product branching fractions are determined to be B(psi(3686) -&gt; gamma eta(c)(2S)) x B(eta(c)(2S) -&gt; p (p) over bar) &lt; 1.4 x 10(-6) and B(psi(3686) -&gt; pi(0)h(c)) x B(h(c) -&gt; p&lt;(p)over bar&gt;) &lt; 1.3 x 10(-7) at the 90% C.L.. The branching fractions for chi(cJ) -&gt; p&lt;(p)over bar&gt; (J = 0, 1, 2) are also measured to be (24.5 +/- 0.8 +/- 1.3, 8.6 +/- 0.5 +/- 0.5, 8.4 +/- 0.5 +/- 0.5) x 10(-5), which are the world's most precise measurements.</p>
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8.
  • Ablikim, M., et al. (författare)
  • Search for the rare decays J/y -&gt; D-s(-) rho(+) and J/psi -&gt; &lt;(D)over bar(0)&lt;(K)over bar*(0)
  • 2014
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 89:7, s. 071101
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>A search for the rare decays of J/psi -&gt; D-S(-) rho(+) + c.c. and J/psi -&gt; &lt;(D)over bar(0)&lt;(K)over bar*(0) + c.c. is performed with a data sample of 225.3-million J/psi events collected with the Beijing Spectrometer III detector. No evident signal is observed. Upper limits on the branching fractions are determined to be beta(J/psi -&gt; D-S(-)rho(+) + c.c.) &lt; 1.3 x 10(-5) and beta(J/psi -&gt; &lt;(D)over bar(0)&lt;(K)over bar*(0) + c.c.) &lt; 2.5 x 10(-6) at the 90% confidence level.</p>
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9.
  • Ablikim, M., et al. (författare)
  • Amplitude analysis of the D+ -&gt; K-S(0)pi + (0)(pi) Dalitz plot
  • 2014
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 89:5, s. 052001
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We perform an analysis of the D+ -&gt; K-S(0)pi + (0)(pi) Dalitz plot using a data set of 2.92 fb(-1) of e(+) e(-) collisions at the (3770) mass accumulated by the BESIII experiment, in which 166694 candidate events are selected with a background of 15.1%. The Dalitz plot is found to be well represented by a combination of six quasitwo- body decay channels [k(SP)(0)(+) (1450)(+,) ] plus a small nonresonant component. Using the fit fractions from this analysis, partial branching ratios are updated with higher precision than previous measurements.</p>
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10.
  • Ablikim, M., et al. (författare)
  • An improved limit for Gamma(ee) of X(3872) and Gamma(ee) measurement of psi(3686)
  • 2015
  • Ingår i: Physics Letters B. - 0370-2693 .- 1873-2445. ; 749, s. 414-420
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Using the data sets taken at center-of-mass energies above 4 GeV by the BESIII detector at the BEPCII storage ring, we search for the reaction e(+)e(-) -&gt; gamma(ISR) X(3872) -&gt; gamma(ISR)pi(+)pi(-) J/psi via the Initial State Radiation technique. The production of a resonance with quantum numbers J(PC) = 1(++) such as the X(3872) via single photon e(+)e(-) annihilation is forbidden, but is allowed by a next-to-leading order box diagram. We do not observe a significant signal of X(3872), and therefore give an upper limit for the electronic width times the branching fraction Gamma B-X(3872)(ee)(X(3872) -&gt; pi(+)pi(-) J/psi) &lt; 0.13 eVat the 90% confidence level. This measurement improves upon existing limits by a factor of 46. Using the same final state, we also measure the electronic width of the psi(3686) to be Gamma(psi)(ee)(3686) ee = 2213 +/- 18(stat) +/- 99(sys) eV.</p>
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