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Identification of the G(3900) Structure as the P-Wave DD[over ¯]^{*}/D[over ¯]D^{*} Resonance.
Phys Rev Lett
December 2024
School of Physics and Center of High Energy Physics, Peking University, Beijing 100871, China.
The BESIII Collaboration recently performed a precise measurement of the e^{+}e^{-}→DD[over ¯] Born cross sections, and confirmed the G(3900) structure reported by BABAR and Belle with high significance. We identify the G(3900) as the first P-wave DD[over ¯]^{*}/D[over ¯]D^{*} molecular resonance. The experimental and theoretical identification of the P-wave dimeson state holds paramount importance in enhancing our comprehension of the nonperturbative QCD and few-body physics.
View Article and Find Full Text PDFSearch for violation in decays in proton-proton collisions at .
Eur Phys J C Part Fields
December 2024
Article Synopsis
- The CMS experiment conducted a search for charge-parity violation in decays using proton-proton collision data from 2018, analyzing around 10 billion events with b hadrons decaying into charm hadrons.
- The flavor of the neutral D meson was determined through the charge of pions in the reconstructed decays, and an asymmetry measurement in the decays was reported, taking into account various uncertainties.
- This research marks the first asymmetry measurement by the CMS in the charm sector and the first to use a fully hadronic final state in such analyses.
Hadron-ion collisions in Pythia and the vector-meson dominance model for photoproduction.
Eur Phys J C Part Fields
November 2024
Department of Physics, University of Jyvaskyla, P.O. Box 35, Fl-40014 Jyvaskyla, Finland.
Article Synopsis
- The extension of the Pythia Monte Carlo event generator allows for detailed simulations of collisions between a hadron beam and nuclear targets, with energy variations for each event.
- The work builds on existing models like Angantyr for heavy ions and includes a vector-meson dominance (VMD) model for simulating real photon interactions in photo-nuclear collisions.
- Validation with HERA data shows the model's effectiveness, and the generated events for ultra-peripheral heavy-ion collisions at the LHC align with ATLAS measurements, demonstrating consistency in single-particle multiplicity and azimuthal anisotropy patterns.
We present a comprehensive study of B^{0}→ωω decays using 772×10^{6} BB[over ¯] pairs collected with the Belle detector at the KEKB e^{+}e^{-} collider. This process is a suppressed charmless decay into two vector mesons and can exhibit interesting polarization and CP violation. The decay is observed for the first time with a significance of 7.
View Article and Find Full Text PDFThe production of ϒ(2S) and ϒ(3S) mesons in lead-lead (Pb-Pb) and proton-proton (pp) collisions is studied in their dimuon decay channel using the CMS detector at the LHC. The ϒ(3S) meson is observed for the first time in Pb-Pb collisions, with a significance above 5 standard deviations. The ratios of yields measured in Pb-Pb and pp collisions are reported for both the ϒ(2S) and ϒ(3S) mesons, as functions of transverse momentum and Pb-Pb collision centrality.
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