Hadron Spectroscopy

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2019-06-14
13:29
[GSI-2019-00744] Journal Article
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Performance studies of the $\overline P$ANDA planar GEM-tracking detector in physics simulations
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2019-06-14
13:20
OpenAccess [GSI-2019-00743] Report/Journal Article
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Evidence of a resonant structure in the $e^+e^-\to \pi^+D^0D^{*-}$ cross section between 4.05 and 4.60 GeV
[arXiv:1808.02847]
The cross section of the process e+e-→π+D0D*- for center-of-mass energies from 4.05 to 4.60 GeV is measured precisely using data samples collected with the BESIII detector operating at the BEPCII storage ring. Two enhancements are clearly visible in the cross section around 4.23 and 4.40 GeV. [...]
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2019-06-14
13:16
OpenAccess [GSI-2019-00742] Journal Article
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First observations of h$_c$ → hadrons
Based on (4.48±0.03)×108  ψ(3686) events, collected with the BESIII detector at the BEPCII storage ring, five hc hadronic decays are searched for via the process ψ(3686)→π0hc. Three of them, hc→p¯pπ+π−, π+π−π0, and 2(π+π−)π0, are observed for the first time with significances of 7.4σ, 4.6σ, and 9.1σ, and their branching fractions are determined to be (2.89±0.32±0.55)×10−3, (1.60±0.40±0.32)×10−3, and (7.44±0.94±1.52)×10−3, respectively, where the first uncertainties are statistical and the second systematic. [...]
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2019-06-14
13:09
OpenAccess [GSI-2019-00741] Journal Article
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Precision resonance energy scans with the PANDA experiment at FAIR
This paper summarises a comprehensive Monte Carlo simulation study for precision resonance energy scan measurements. Apart from the proof of principle for natural width and line shape measurements of very narrow resonances with PANDA, the achievable sensitivities are quantified for the concrete example of the charmonium-like X(3872) state discussed to be exotic, and for a larger parameter space of various assumed signal cross-sections, input widths and luminosity combinations. [...]
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2019-05-27
10:43
OpenAccess [GSI-2019-00672] Report/Journal Article
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Measurements of the branching fractions for the semi-leptonic decays $D^+_s\to\phi e^{+}\nu_{e}$, $\phi \mu^{+}\nu_{\mu}$, $\eta \mu^{+}\nu_{\mu}$ and $\eta'\mu^{+}\nu_{\mu}$
[arXiv:1709.03680]
By analyzing 482  pb-1 of e+e- collision data collected at the center-of-mass energy s=4.009  GeV with the BESIII detector, we measure the branching fractions for the semi-leptonic decays Ds+→ϕe+νe, ϕμ+νμ, ημ+νμ and η′μ+νμ to be B(Ds+→ϕe+νe)=(2.26±0.45±0.09)%, B(Ds+→ϕμ+νμ)=(1.94±0.53±0.09)%, B(Ds+→ημ+νμ)=(2.42±0.46±0.11)% and B(Ds+→η′μ+νμ)=(1.06±0.54±0.07)%, where the first and second uncertainties are statistical and systematic, respectively. The branching fractions for the three semi-muonic decays Ds+→ϕμ+νμ,ημ+νμ and η′μ+νμ are determined for the first time and that of Ds+→ϕe+νe is consistent with the world average value within uncertainties..
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2019-05-27
10:39
OpenAccess [GSI-2019-00671] Report/Journal Article
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Determination of the number of $\psi(3686)$ events at BESIII
[arXiv:1709.03653]
The numbers of ψ(3686) events accumulated by the BESIII detector for the data taken during 2009 and 2012 are determined to be and , respectively, by counting inclusive hadronic events, where the uncertainties are systematic and the statistical uncertainties are negligible. The number of events for the sample taken in 2009 is consistent with that of the previous measurement. [...]
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2019-05-27
10:31
OpenAccess [GSI-2019-00670] Report/Journal Article
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Observation of $e^{+}e^{-} \to \phi\chi_{c1}$ and $\phi\chi_{c2}$ at $\sqrt{s}$=4.600 GeV
[arXiv:1712.09240]
Using a data sample collected with the BESIII detector operating at the BEPCII storage ring at a center-of-mass energy of s=4.600  GeV, we search for the production of e+e-→ϕχc0,1,2. A search is also performed for the charmonium-like state X(4140) in the radiative transition e+e-→γX(4140) with X(4140) subsequently decaying into ϕJ/ψ. [...]
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2019-05-27
10:25
OpenAccess [GSI-2019-00668] Report/Journal Article
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Observation of a cross-section enhancement near mass threshold in $e^{+}e^{-}\rightarrow\Lambda\bar{\Lambda}$
[arXiv:1709.10236]
The process e+e-→ΛΛ¯ is studied using data samples at s=2.2324, 2.400, 2.800 and 3.080 GeV collected with the BESIII detector operating at the BEPCII collider. The Born cross section is measured at s=2.2324  GeV, which is 1.0 MeV above the ΛΛ¯ mass threshold, to be 305±45-36+66  pb, where the first uncertainty is statistical and the second systematic. [...]
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2019-05-27
10:23
OpenAccess [GSI-2019-00667] Report/Journal Article
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Measurement of $e^{+}e^{-} \to \pi^{0}\pi^{0}\psi(3686)$ at $\sqrt{s}$ from 4.009 to 4.600 GeV and observation of a neutral charmoniumlike structure
[astro-ph/0311399]
We report observations of the hot post-asymptotic giant branch star ZNG 1 in the globular cluster M5 (NGC 5904) with the Far Ultraviolet Spectroscopic Explorer (FUSE). From the resulting spectrum, we derive an effective temperature T_eff = 44300 +/- 300 K, a surface gravity log g = 4.3 +/- 0.1, a rotational velocity v sin i = 170 +/- 20 km/s, and a luminosity log (L/L_sun) = 3.52 +/- 0.04. [...]
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2019-05-27
10:20
OpenAccess [GSI-2019-00666] Report/Journal Article
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Improved measurements of $\chi_{cJ} \rightarrow \Sigma^+ \bar{\Sigma}^-$ and $\Sigma^0 \bar{\Sigma}^0$ decays
[arXiv:1710.07922]
Using a data sample of (448.1±2.9)×106 ψ(3686) events collected with the BESIII detector at the BEPCII collider, we present measurements of branching fractions for the decays χcJ→Σ+Σ¯- and Σ0Σ¯0. The decays χc1,2→Σ+Σ¯- and Σ0Σ¯0 are observed for the first time, and the branching fractions for χc0→Σ+Σ¯- and Σ0Σ¯0 decays are measured with improved precision. [...]
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