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Triangle Singularity as the Origin of the a_{1}(1420).
Phys Rev Lett
August 2021
Institute of Radioelectronics, Warsaw University of Technology, 00-665 Warsaw, Poland.
The COMPASS Collaboration experiment recently discovered a new isovector resonancelike signal with axial-vector quantum numbers, the a_{1}(1420), decaying to f_{0}(980)π. With a mass too close to and a width smaller than the axial-vector ground state a_{1}(1260), it was immediately interpreted as a new light exotic meson, similar to the X, Y, Z states in the hidden-charm sector. We show that a resonancelike signal fully matching the experimental data is produced by the decay of the a_{1}(1260) resonance into K^{*}(→Kπ)K[over ¯] and subsequent rescattering through a triangle singularity into the coupled f_{0}(980)π channel.
View Article and Find Full Text PDFE2 decay strength of the M1 scissors mode of ^{156}Gd and its first excited rotational state.
Phys Rev Lett
May 2017
Institut für Kernphysik, TU Darmstadt, Schlossgartenstr. 9, D-64289 Darmstadt, Germany.
The E2/M1 multipole mixing ratio δ_{1→2} of the 1_{sc}^{+}→2_{1}^{+} γ-ray decay in ^{156}Gd and hence the isovector E2 transition rate of the scissors mode of a well-deformed rotational nucleus has been measured for the first time. It has been obtained from the angular distribution of an artificial quasimonochromatic linearly polarized γ-ray beam of energy 3.07(6) MeV scattered inelastically off an isotopically highly enriched ^{156}Gd target.
View Article and Find Full Text PDFEnergy Scan of the e^{+}e^{-}→h_{b}(nP)π^{+}π^{-} (n=1, 2) Cross Sections and Evidence for ϒ(11020) Decays into Charged Bottomoniumlike States.
Phys Rev Lett
September 2016
J. Stefan Institute, 1000 Ljubljana.
Using data collected with the Belle detector at the KEKB asymmetric-energy e^{+}e^{-} collider, we measure the energy dependence of the e^{+}e^{-}→h_{b}(nP)π^{+}π^{-} (n=1, 2) cross sections from thresholds up to 11.02 GeV. We find clear ϒ(10860) and ϒ(11020) peaks with little or no continuum contribution.
View Article and Find Full Text PDFDecoding the riddle of Y(4260) and Zc(3900).
Phys Rev Lett
September 2013
Institut für Kernphysik and Institute for Advanced Simulation, Forschungszentrum Jülich, D-52425 Jülich, Germany.
The observation of Zc(3900) by the BESIII Collaboration in the invariant mass spectrum of J/ψπ± in e+e-→J/ψπ+π- at the center of mass 4.260 GeV suggests the existence of a charged DD*+DD* molecular state with I(JP)=1(1+), which could be an isovector brother of the famous X(3872) and an analogue of Zb(10610) claimed by the Belle Collaboration. We demonstrate that this observation provides strong evidence that the mysterious Y(4260) is a DD1(2420)+DD1(2420) molecular state.
View Article and Find Full Text PDFVariation in displacement energies due to isospin-nonconserving forces.
Phys Rev Lett
April 2013
Department of Physics, Kyushu Sangyo University, Fukuoka 813-8503, Japan.
For mirror nuclei with masses A=42-95, the effects of isospin-nonconserving nuclear forces are studied with the nuclear shell model using the Coulomb displacement energy and triplet displacement energy as probes. It is shown that the characteristic behavior of the displacement energies can be well reproduced if the isovector and isotensor nuclear interactions with J=0 and T=1 are introduced into the f(7/2) shell. These forces, with their strengths being found consistent with the nucleon-nucleon scattering data, tend to modify nuclear binding energies near the N=Z line.
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