Preprints

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2017-01-31
16:09
arXiv [GSI-2017-00323] Preprint
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Feasibility studies of time-like proton electromagnetic form factors at PANDA at FAIR
Simulation results for future measurements of electromagnetic proton form factors at \PANDA (FAIR) within the PandaRoot software framework are reported. The statistical precision with which the proton form factors can be determined is estimated. [...]

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2017-01-31
14:25
arXiv [GSI-2017-00272] Preprint
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Determination of the number of J/ψ events with inclusive J/ψ decays
A measurement of the number of $J/\psi$ events collected with the BESIII detector in 2009 and 2012 is performed using inclusive decays of the $J/\psi$ . The number of $J/\psi$ events taken in 2009 is recalculated to be $(223.7\pm1.4)\times 10^6$, which is in good agreement with the previous measurement, but with significantly improved precision due to improvements in the BESIII software. [...]

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2017-01-31
13:58
arXiv [GSI-2017-00251] Preprint
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Feasibility study for the measurement of $\pi N$ TDAs at PANDA in $\bar{p}p\to J/\psi\pi^0$
The exclusive charmonium production process in $\bar{p}p$ annihilation with an associated $\pi^0$ meson $\bar{p}p\to J/\psi\pi^0$ is studied in the framework of QCD collinear factorization. The feasibility of measuring this reaction through the $J/\psi\to e^+e^-$ decay channel with the PANDA (AntiProton ANnihilation at DArmstadt) experiment is investigated. [...]

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2017-01-31
11:59
arXiv [GSI-2017-00221] Preprint
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Amplitude analysis of the $\chi_{c1} \to \eta\pi^+\pi^-$ decays
Using $448.0 \times 10^6$~$\psi(3686)$ events collected with the BESIII detector, an amplitude analysis is performed for $\psi(3686)\to\gamma\chi_{c1}$, $\chi_{c1}\to\eta\pi^+\pi^-$ decays. The most dominant two-body structure observed is $a_0(980)^{\pm}\pi^{\mp}$; $a_0(980)^{\pm}\to\eta\pi^{\pm}$. [...]

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2017-01-31
11:56
arXiv [GSI-2017-00220] Preprint
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Precise measurement of the $e^+e^-\to \pi^+\pi^-J/\psi$ cross section at center-of-mass energies from 3.77 to 4.60 GeV
The cross section for the process $e^+e^-\to \pi^+\pi^-J/\psi$ is measured precisely at center-of-mass energies from 3.77 to 4.60~GeV using 9~fb$^{-1}$ of data collected with the BESIII detector operating at the BEPCII storage ring. Two resonant structures are observed in a fit to the cross section. [...]

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2017-01-31
11:36
arXiv [GSI-2017-00217] Preprint
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Observation of $\Lambda^+_{c}\to nK^0_S\pi^+$
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 $\sqrt{s}=4.599$ GeV with the BESIII detector at the BEPCII collider. [...]

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2017-01-30
21:37
arXiv [GSI-2017-00208] Preprint
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Equations of state for supernovae and compact stars
We review various theoretical approaches for the equation of state (EoS) of dense matter, relevant for the description of core-collapse supernovae, compact stars and compact star mergers. The emphasis is put on models that are applicable to all of these scenarios. [...]

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2017-01-30
21:31
arXiv [GSI-2017-00207] Preprint
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Coulomb breakup of neutron-rich $^{29,30}$Na isotopes near the island of inversion

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2017-01-30
20:52
arXiv [GSI-2017-00206] Preprint
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Determination of the Neutron-Capture Rate of 17C for the R-process Nucleosynthesis
With the R$^{3}$B-LAND setup at GSI we have measured exclusive relative-energy spectra of the Coulomb dissociation of $^{18}$C at a projectile energy around 425~AMeV on a lead target, which are needed to determine the radiative neutron-capture cross sections of $^{17}$C into the ground state of $^{18}$C. Those data have been used to constrain theoretical calculations for transitions populating excited states in $^{18}$C. [...]

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2017-01-30
20:47
arXiv [GSI-2017-00205] Preprint
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Nuclear Clustering in Fermionic Molecular Dynamics
Clustering plays an important role in the structure of nuclei, especially for light nuclei in the $p$-shell. In nuclear cluster models these degrees of freedom are introduced explicitly. [...]

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