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Antiproton annihilation at rest in thin solid targets and comparison with Monte Carlo simulations.
Eur Phys J A Hadron Nucl
November 2024
Stefan Meyer Institute for Subatomic Physics, Austrian Academy of Sciences, Vienna, Austria.
The mechanism of antiproton-nucleus annihilation at rest is not fully understood, despite substantial previous experimental and theoretical work. In this study we used slow extracted antiprotons from the ASACUSA apparatus at CERN to measure the charged particle multiplicities and their energy deposits from antiproton annihilations at rest on three different nuclei: carbon, molybdenum and gold. The results are compared with predictions from different models in the simulation tools Geant4 and FLUKA.
View Article and Find Full Text PDFA search for collective effects inside jets produced in proton-proton collisions is performed via correlation measurements of charged particles using the CMS detector at the CERN LHC. The analysis uses data collected at a center-of-mass energy of sqrt[s]=13 TeV, corresponding to an integrated luminosity of 138 fb^{-1}. Jets are reconstructed with the anti-k_{T} algorithm with a distance parameter of 0.
View Article and Find Full Text PDFEmergence of Long-Range Angular Correlations in Low-Multiplicity Proton-Proton Collisions.
Phys Rev Lett
April 2024
INFN, Sezione di Pavia, Pavia, Italy.
Article Synopsis
- - This Letter discusses the measurement of ridge yields from charged hadron angular correlations in proton-proton collisions at a high energy of 13 TeV, specifically within certain pseudorapidity and transverse momentum ranges.
- - The research extends ridge yield measurements to low charged-particle multiplicity regions, where typically a strong interacting medium is not expected to form during collisions.
- - Findings indicate that ridge yields in pp collisions are significantly higher than those observed in e^{+}e^{-} collisions, suggesting that processes in e^{+}e^{-} annihilations do not significantly influence long-range correlations in proton-proton interactions.
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
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