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1.
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2.
  • Adare, A., et al. (författare)
  • J/psi suppression at forward rapidity in Au plus Au collisions at root s(NN)=39 and 62.4 GeV
  • 2012
  • Ingår i: Physical Review C (Nuclear Physics). - American Physical Society. - 0556-2813. ; 86:6
  • Tidskriftsartikel (refereegranskat)abstract
    • We present measurements of the J/psi invariant yields in root s(NN) = 39 and 62.4 GeV Au + Au collisions at forward rapidity (1.2 < vertical bar y vertical bar < 2.2). Invariant yields are presented as a function of both collision centrality and transverse momentum. Nuclear modifications are obtained for central relative to peripheral Au + Au collisions (R-CP) and for various centrality selections in Au + Au relative to scaled p + p cross sections obtained from other measurements (R-AA). The observed suppression patterns at 39 and 62.4 GeV are quite similar to those previously measured at 200 GeV. This similar suppression presents a challenge to theoretical models that contain various competing mechanisms with different energy dependencies, some of which cause suppression and others enhancement. DOI: 10.1103/PhysRevC.86.064901
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3.
  • 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
    • 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.
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4.
  • Abgrall, N., et al. (författare)
  • The large enriched germanium experiment for neutrinoless double beta decay (LEGEND)
  • 2017
  • Ingår i: Workshop on Calculation of Double-Beta-Decay Matrix Elements, MEDEX 2017. - American Institute of Physics Inc.. - 9780735415775 ; 1894
  • Konferensbidrag (refereegranskat)abstract
    • The observation of neutrinoless double-beta decay (0νββ) would show that lepton number is violated, reveal that neu-trinos are Majorana particles, and provide information on neutrino mass. A discovery-capable experiment covering the inverted ordering region, with effective Majorana neutrino masses of 15 - 50 meV, will require a tonne-scale experiment with excellent energy resolution and extremely low backgrounds, at the level of ∼0.1 count /(FWHM·t·yr) in the region of the signal. The current generation 76Ge experiments GERDA and the Majorana Demonstrator, utilizing high purity Germanium detectors with an intrinsic energy resolution of 0.12%, have achieved the lowest backgrounds by over an order of magnitude in the 0νββ signal region of all 0νββ experiments. Building on this success, the LEGEND collaboration has been formed to pursue a tonne-scale 76Ge experiment. The collaboration aims to develop a phased 0νββ experimental program with discovery potential at a half-life approaching or at 1028 years, using existing resources as appropriate to expedite physics results.
5.
  • 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
    • 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*.
6.
  • Ablikim, M., et al. (författare)
  • Amplitude analysis of D0 -&gt; K -π+π+π-
  • 2017
  • Ingår i: Physical Review D : covering particles, fields, gravitation, and cosmology. - 2470-0010 .- 2470-0029. ; 95:7
  • Tidskriftsartikel (refereegranskat)abstract
    • 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%.
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7.
  • 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
    • 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.
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8.
  • Ablikim, M., et al. (författare)
  • Amplitude analysis of the π$^0$π$^0$ system produced in radiative J/ψ decays
  • 2016
  • Ingår i: PHYSICAL REVIEW D. - 2470-0010. ; 93:3
  • Tidskriftsartikel (refereegranskat)abstract
    • An amplitude analysis of the π0π0 system produced in radiative J/ψ decays is presented. In particular, a piecewise function that describes the dynamics of the π0π0 system is determined as a function of Mπ0π0 from an analysis of the (1.311±0.011)×109 J/ψ decays collected by the BESIII detector. The goal of this analysis is to provide a description of the scalar and tensor components of the π0π0 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/ψ→γπ0π0 is determined to be (1.15±0.05)×10-3, where the uncertainty is systematic only and the statistical uncertainty is negligible.
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9.
  • Ablikim, M., et al. (författare)
  • Dark photon search in the mass range between 1.5 and 3.4 GeV/c
  • 2017
  • Ingår i: Physics Letters B. - 0370-2693 .- 1873-2445. ; 774, s. 252-257
  • Tidskriftsartikel (refereegranskat)abstract
    • Using a data set of 2.93 fb taken at a center-of-mass energy root s = 3.773 GeV with the BESIII detector at the BEPCII collider, we perform a search for an extra U(1) gauge boson, also denoted as a dark photon. We examine the initial state radiation reactions e(+)e(-) -&gt; e(+)e(-) gamma(ISR) and e(+)e(-) -&gt; mu(+)mu(-) gamma(ISR) for this search, where the dark photon would appear as an enhancement in the invariant mass distribution of the leptonic pairs. We observe no obvious enhancement in the mass range between 1.5 and 3.4 GeV/c(2) and set a 90% confidence level upper limit on the mixing strength of the dark photon and the Standard Model photon. We obtain a competitive limit in the tested mass range.
10.
  • 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
    • 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(-).
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