SwePub
Sök i SwePub databas

  Utökad sökning

Träfflista för sökning "WFRF:(Li L) "

Sökning: WFRF:(Li L)

Sortera/gruppera träfflistan
   
NumreringReferensOmslagsbildHitta
11.
  • Ablikim, M., et al. (författare)
  • Measurement of e(+)e(-) -> pi(+)pi(-) psi(3686) from 4.008 to 4.600 GeV and observation of a charged structure in the pi(+/-)psi(3686) mass spectrum
  • 2017
  • Ingår i: Physical Review D : covering particles, fields, gravitation, and cosmology. - 2470-0010 .- 2470-0029. ; 96:3
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We study the process e(+)e(-) -&gt; p(+)p(-)psi(3686) using 5.1 fb(-1) of data collected at 16 center-of-mass energy (root s) points from 4.008 to 4.600 GeV by the BESIII detector operating at the BEPCII collider. The measured Born cross sections for e(+)e(-) -&gt; p(+)p(-)psi(3686) are consistent with previous results, but with much improved precision. A fit to the cross section shows contributions from two structures: the first has M = 4209.5 +/- 7.4 +/- 1.4 MeV/c(2) and Gamma = 80.1 +/- 24.6 +/- 2.9 MeV, and the second has M = 4383.8 +/- 4.2 +/- 0.8 MeV/c(2) and Gamma = 84.2 +/- 12.5 +/- 2.1 MeV, where the first errors are statistical and the second systematic. The lower-mass resonance is observed in the process e(+)e(-) -&gt; p(+)p(-)psi(3686) for the first time with a statistical significance of 5.8 sigma. A charged charmoniumlike structure is observed in the pi(+/-)psi(3686) invariant mass spectrum for data at root s = 4.416 GeV. A fit with an S-wave Breit-Wigner function yields a mass M = 4032.1 +/- 2.4 MeV/c(2), where the errors are statistical only. However, there are still unresolved discrepancies between the fit model and data. The width of the intermediate state varies in a wide range for different kinematic regions within the data set. Therefore, no simple interpretation of the data has been found, and a future data sample with larger statistics and more theoretical input will be required to better understand this issue.</p>
  •  
12.
  • Ablikim, M., et al. (författare)
  • Measurement of singly Cabibbo-suppressed decays D-0 → <em>π</em><sup>0</sup><em>π</em><sup>0</sup><em>π</em><sup>0</sup>, <em>π</em><sup>0</sup><em>π</em><sup>0</sup><em>η</em>, <em>π</em><sup>0</sup><em>ηη</em> and <em>ηηη</em>
  • 2018
  • Ingår i: Physics Letters B. - ELSEVIER SCIENCE BV. - 0370-2693 .- 1873-2445. ; 781, s. 368-375
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Using a data sample of e(+)e(-) collision data corresponding to an integrated luminosity of 2.93 fb(-1) collected with the BESIII detector at a center-of-mass energy of root s = 3.773 GeV, we search for the singly Cabibbo-suppressed decays D-0 -&gt; pi(0)pi(0)pi(0), pi(0)pi(0)eta, pi(0)eta eta and eta eta eta using the double tag method. The absolute branching fractions are measured to be B(D-0 -&gt; pi(0)pi(0)pi(0)) = (2.0 +/- 0.4 +/- 0.3) x 10(-4), B(D-0 -&gt; pi(0)pi(0)eta) = (3.8 +/- 1.1 +/- 0.7) x 10(-4) and B(D-0 -&gt; pi(0)eta eta) = (7.3 +/- 1.6 +/- 1.5) x 10(-4) with the statistical significances of 4.8 sigma, 3.8 sigma and 5.5 sigma, respectively, where the first uncertainties are statistical and the second ones systematic. No significant signal of D-0 -&gt; eta eta eta is found, and the upper limit on its decay branching fraction is set to be B(D-0 -&gt; eta eta eta) &lt; 1.3 x 10(-4) at the 90% confidence level.</p>
  •  
13.
  • Ablikim, M., et al. (författare)
  • Measurement of the absolute branching fraction of D*(s0) (2317)(+/-) -&gt; pi D-0(s)+/-
  • 2018
  • Ingår i: Physical Review D : covering particles, fields, gravitation, and cosmology. - American Physical Society. - 2470-0010 .- 2470-0029. ; 97:5
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>The process e(+)e(-) -&gt; D*D-+(s)*(s0) (2317)(-) + c.c. is observed for the first time with the data sample of 567 pb(-1) collected with the BESIII detector operating at the BEPCII collider at a center-of-mass energy root s = 4.6 GeV. The statistical significance of the D*(s0) (2317)(+/-) signal is 5.8 sigma and the mass is measured to be (2318.3 +/- 1.2 +/- 1.2) MeV/c(2). The absolute branching fraction B(D*(s0) (2317)(+/-) -&gt; pi D-0(s)+/-) is measured as 1.00(-0.14)(+0.00) (stat)(-0.14)(+0.00) (syst) for the first time. The uncertainties are statistical and systematic, respectively.</p>
  •  
14.
  • 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>
  •  
15.
  • Ablikim, M., et al. (författare)
  • Measurement of the integrated Luminosities of cross-section scan data samples around the psi(3770) mass region
  • 2018
  • Ingår i: Chinese Physics C, High Energy Physics & Nuclear Physics. - SCIENCE PRESS. - 1674-1137 .- 0899-9996. ; 42:6
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>To investigate the nature of the psi(3770) resonance and to measure the cross section for e(+)e(-) -&gt; D (D) over bar, a cross-section scan data sample, distributed among 41 center-of-mass energy points from 3.73 to 3.89 GeV, was taken with the BESIII detector operated at the BEPCII collider in the year 2010. By analyzing the large angle Bhabha scattering events, we measure the integrated luminosity of the data sample at each center-of-mass energy point. The total integrated luminosity of the data sample is 76.16 +/- 0.04 +/- 0.61 pb(-1), where the first uncertainty is statistical and the second systematic.</p>
  •  
16.
  • Ablikim, M., et al. (författare)
  • Measurements of cross section of e(+)e(-) -&gt; p(p)over-bar pi(0) at center-of-mass energies between 4.008 and 4.600 GeV
  • 2017
  • Ingår i: Physics Letters B. - ELSEVIER SCIENCE BV. - 0370-2693 .- 1873-2445. ; 771, s. 45-51
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Based on e(+)e(-) annihilation data samples collected with the BESIII detector at the BEPCII collider at 13 center-of-mass energies from 4.008 to 4.600 GeV, measurements of the Born cross section of e(+)e(-) -&gt; p (p) over bar pi(0) are performed. No significant resonant structure is observed in the measured energy dependence of the cross section. The upper limit on the Born cross section of e(+)e(-) -&gt; Y (4260) -&gt; p (p) over bar pi(0) at the 90% C. L. is determined to be 0.01 pb. The upper limit on the ratio of the branching fractions B(Y(4260) -&gt; p (p) over bar pi(0))/B(Y(4260) -&gt; pi(+)pi(-) j/Psi) at the 90% C. L. is determined to be 0.02%.</p>
  •  
17.
  • 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>
  •  
18.
  • 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>
  •  
19.
  • 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>
  •  
20.
  • Ablikim, M., et al. (författare)
  • Amplitude analysis of D<sup>0</sup> -&gt; K<sup> -</sup>π<sup>+</sup>π<sup>+</sup>π<sup>-</sup>
  • 2017
  • Ingår i: Physical Review D : covering particles, fields, gravitation, and cosmology. - 2470-0010 .- 2470-0029. ; 95:7
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present an amplitude analysis of the decay D-0 -&gt; K- pi(+)pi(+)pi(-) based on a data sample of 2.93 fb(-1) acquired by the BESIII detector at the psi(3770) resonance. With a nearly background free sample of about 16000 events, we investigate the substructure of the decay and determine the relative fractions and the phases among the different intermediate processes. Our amplitude model includes the two-body decays D-0 -&gt; (K) over bar*(0)rho(0), D-0 -&gt; K- a(1)(+) (1260) and D-0 -&gt; K-1(-)(1270)pi(+), the three-body decays D-0 -&gt; K-1(-)*(0)pi(+)pi(-) and D-0 -&gt; K- pi(+)rho(0), as well as the four-body nonresonant decay D-0 -&gt; K- pi(+)pi(+)pi(-). The dominant intermediate process is D-0 -&gt; K(-)a(1)(+)(1260)accounting for a fit fraction of 54.6%.</p>
  •  
Skapa referenser, mejla, bekava och länka
Åtkomst
fritt online (402)
Typ av publikation
tidskriftsartikel (3153)
konferensbidrag (235)
forskningsöversikt (48)
bokkapitel (12)
annan publikation (5)
rapport (4)
visa fler...
proceedings (redaktörskap) (1)
recension (1)
visa färre...
Typ av innehåll
refereegranskat (3286)
övrigt vetenskapligt (312)
populärvet., debatt m.m. (3)
Författare/redaktör
Davies, G. (329)
Dominguez, A. (318)
Choi, S. (313)
Chen, G. (308)
Adams, M. (304)
Desai, S. (304)
visa fler...
Gutierrez, G. (304)
Han, L. (304)
Bernardi, G. (303)
Bross, A. (303)
Das, A. (303)
Haley, J. (303)
Abbott, B., (302)
Borissov, G. (302)
Brandt, A. (302)
Brock, R. (302)
Bernhard, R. (302)
Burdin, S. (302)
Alton, A. (302)
Askew, A. (302)
Avila, C. (302)
Bagby, L. (302)
Baldin, B. (302)
Bean, A. (302)
Beuselinck, R. (302)
Boehnlein, A. (302)
Buehler, M. (302)
Chandra, A. (302)
Choudhary, B. (302)
Claes, D. (302)
Cooke, M. (302)
Corcoran, M. (302)
Cutts, D. (302)
Demina, R. (302)
Denisov, D. (302)
De La Cruz-Burelo, E ... (302)
Diesburg, M. (302)
Eads, M. (302)
Ellison, J. (302)
Ferbel, T. (302)
Fisher, W. (302)
Fox, H. (302)
Fuess, S. (302)
Garcia-Bellido, A. (302)
Gavrilov, V. (302)
Greenlee, H. (302)
Grenier, G. (302)
Heintz, U. (302)
Hoeneisen, B. (302)
Jesik, R. (302)
visa färre...
Lärosäte
Karolinska Institutet (1123)
Uppsala universitet (816)
Lunds universitet (572)
Kungliga Tekniska Högskolan (305)
Göteborgs universitet (299)
Umeå universitet (157)
visa fler...
Chalmers tekniska högskola (151)
Stockholms universitet (132)
Linköpings universitet (65)
Mälardalens högskola (27)
Luleå tekniska universitet (24)
Örebro universitet (11)
Södertörns högskola (9)
RISE (9)
Högskolan i Jönköping (7)
Linnéuniversitetet (7)
Högskolan Dalarna (6)
swepub_uni:mau_t (4)
Blekinge Tekniska Högskola (4)
Mittuniversitetet (3)
Högskolan Kristianstad (2)
Högskolan Väst (2)
Högskolan i Skövde (2)
Högskolan i Halmstad (2)
Högskolan i Gävle (2)
Naturhistoriska riksmuseet (2)
Ersta Sköndal Bräcke högskola (1)
visa färre...
Språk
Engelska (3436)
Kinesiska (6)
Odefinierat språk (5)
Svenska (1)
Japanska (1)
Forskningsämne (UKÄ/SCB)
Naturvetenskap (1342)
Medicin och hälsovetenskap (849)
Teknik (273)
Samhällsvetenskap (19)
Lantbruksvetenskap (13)
Humaniora (1)

År

 
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy