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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.
Enhanced Production of Λ_{b}^{0} Baryons in High-Multiplicity pp Collisions at sqrt[s]=13 TeV.
Phys Rev Lett
February 2024
Department of Physics and Astronomy, University of Manchester, Manchester, United Kingdom.
The production rate of Λ_{b}^{0} baryons relative to B^{0} mesons in pp collisions at a center-of-mass energy sqrt[s]=13 TeV is measured by the LHCb experiment. The ratio of Λ_{b}^{0} to B^{0} production cross sections shows a significant dependence on both the transverse momentum and the measured charged-particle multiplicity. At low multiplicity, the ratio measured at LHCb is consistent with the value measured in e^{+}e^{-} collisions, and increases by a factor of ∼2 with increasing multiplicity.
View Article and Find Full Text PDFEvidence for Modification of b Quark Hadronization in High-Multiplicity pp Collisions at sqrt[s]=13 TeV.
Phys Rev Lett
August 2023
Department of Physics and Astronomy, University of Manchester, Manchester, United Kingdom.
Article Synopsis
- The LHCb experiment measured the production rates of B_{s}^{0} and B^{0} mesons in proton-proton collisions at a high energy of 13 TeV, focusing on events with different levels of particle density.
- They observed a significant 3.4σ increase in the ratio of B_{s}^{0} to B^{0} mesons at low transverse momenta (below 6 GeV/c) as the number of charged particles in the event increased, but no significant change at higher momenta.
- The findings suggest that the hadronic medium's density influences B meson production, which aligns with the idea that quark coalescence might be a key process in creating particles during
First Measurement of Λ Electroproduction off Nuclei in the Current and Target Fragmentation Regions.
Phys Rev Lett
April 2023
Argonne National Laboratory, Argonne, Illinois 60439, USA.
We report results of Λ hyperon production in semi-inclusive deep-inelastic scattering off deuterium, carbon, iron, and lead targets obtained with the CLAS detector and the Continuous Electron Beam Accelerator Facility 5.014 GeV electron beam. These results represent the first measurements of the Λ multiplicity ratio and transverse momentum broadening as a function of the energy fraction (z) in the current and target fragmentation regions.
View Article and Find Full Text PDFQuantum chromodynamics, the theory of the strong force, describes interactions of coloured quarks and gluons and the formation of hadronic matter. Conventional hadronic matter consists of baryons and mesons made of three quarks and quark-antiquark pairs, respectively. Particles with an alternative quark content are known as exotic states.
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