Bibliografie tematiche / Proton-lead collisions

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Letteratura scientifica selezionata sul tema "Proton-lead collisions"

Autore: Grafiati

Pubblicato: 21 dicembre 2024

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Articoli di riviste sul tema "Proton-lead collisions"

Hayrapetyan, A., A. Tumasyan, W. Adam, et al. "Performance of CMS muon reconstruction from proton-proton to heavy ion collisions." Journal of Instrumentation 19, no. 09 (2024): P09012. http://dx.doi.org/10.1088/1748-0221/19/09/p09012.

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Abstract The performance of muon tracking, identification, triggering, momentum resolution, and momentum scale has been studied with the CMS detector at the LHC using data collected at √(s NN) = 5.02 TeV in proton-proton (pp) and lead-lead (PbPb) collisions in 2017 and 2018, respectively, and at √(s NN) = 8.16 TeV in proton-lead (pPb) collisions in 2016. Muon efficiencies, momentum resolutions, and momentum scales are compared by focusing on how the muon reconstruction performance varies from relatively small occupancy pp collisions to the larger occupancies of pPb collisions and, finally, to the highest track multiplicity PbPb collisions. We find the efficiencies of muon tracking, identification, and triggering to be above 90% throughout most of the track multiplicity range. The momentum resolution and scale are unaffected by the detector occupancy. The excellent muon reconstruction of the CMS detector enables precision studies across all available collision systems.

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Baty, Austin. "Overview of recent CMS results." EPJ Web of Conferences 296 (2024): 01002. http://dx.doi.org/10.1051/epjconf/202429601002.

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Abstract (sommario):

Recent results from the CMS Collaboration are presented. These measurements include a full physics program using ultraperipheral collisions such as photon-photon and photon-ion interactions, small collision systems including proton-proton and proton-lead collisions, and many measurements of hadronic ion-ion collisions. The properties of the quark-gluon plasma produced in ion-ion collisions are studied in detail. The measurements examine the number of degrees of freedom of the medium, the strength of jet quenching effects in the medium, the role of heavy flavor in hadronization processes, and more.

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Ercolessi, Francesca. "Shedding light on light-flavour-particle production in small systems at the LHC with ALICE." EPJ Web of Conferences 296 (2024): 12009. http://dx.doi.org/10.1051/epjconf/202429612009.

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Abstract (sommario):

The measurement of light-flavour-particle production in small collision systems at the LHC has shown features that resemble phenomena seen in heavy-ion collisions. The historical signatures of the quark–gluon plasma (QGP) formation, such as collective flow and the enhanced production of strange hadrons, were also observed in high-multiplicity proton–proton (pp) and proton–lead (p–Pb) collisions. In this article, new results on lightflavour-particle production measured in high-multiplicity triggered events are presented, reaching charged-particle values of semi-peripheral Pb–Pb collisions. In addition, this paper presents the first Run 3 results on the production of π, K, p, and Ω multi-strange baryons in pp collisions at √S = 13:6 TeV and √S = 900 GeV, the highest and the lowest collision energies at the LHC.

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Li, Li-Li, Fu-Hu Liu, Muhammad Waqas, Rasha Al-Yusufi, and Altaf Mujear. "Excitation Functions of Related Parameters from Transverse Momentum (Mass) Spectra in High-Energy Collisions." Advances in High Energy Physics 2020 (June 10, 2020): 1–21. http://dx.doi.org/10.1155/2020/5356705.

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Abstract (sommario):

Transverse momentum (mass) spectra of positively and negatively charged pions and of positively and negatively charged kaons, protons, and antiprotons produced at mid-(pseudo)rapidity in various collisions at high energies are analyzed in this work. The experimental data measured in central gold-gold, central lead-lead, and inelastic proton-proton collisions by several international collaborations are studied. The (two-component) standard distribution is used to fit the data and extract the excitation function of effective temperature. Then, the excitation functions of kinetic freeze-out temperature, transverse flow velocity, and initial temperature are obtained. In the considered collisions, the four parameters increase with the increase of collision energy in general, and the kinetic freeze-out temperature appears at the trend of saturation at the top Relativistic Heavy Ion Collider and the Large Hadron Collider.

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Masson, Erwann, and on behalf of the ALICE Collaboration. "Direct Photon Measurements with the ALICE Experiment at the LHC." Proceedings 10, no. 1 (2019): 1. http://dx.doi.org/10.3390/proceedings2019010001.

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Abstract (sommario):

In high-energy hadron collisions, direct photons can be produced in various processes andare of particular interest to study the hot QCD medium since they escape it without being affected.These proceedings present the latest ALICE experiment results concerning direct photon productionin proton-proton (pp), proton-lead (p–Pb) and lead-lead (Pb–Pb) collisions. All measurements agreewith pQCD calculations at high transverse momentum (pT) and show no direct photon excess at lowpT in small systems while a low-pT signal is found in central Pb–Pb collisions.

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Falmagne, Guillaume. "First measurement of the B_c⁺ meson nuclear modification factor in PbPb collisions with CMS." EPJ Web of Conferences 259 (2022): 12011. http://dx.doi.org/10.1051/epjconf/202225912011.

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Abstract (sommario):

The Bc+ meson is observed in lead-lead and proton-proton collisions at a center-of-mass energy per nucleon pair of √SNN = 5.02 TeV, via the Bc+ → (J/ψ → μ+μ−)μ+vμ decay and using 2017 and 2018 data from the CMS detector. The resulting Bc+ nuclear modification factor is measured in two bins of the trimuon transverse momentum and of the collision centrality. Less suppression is observed than for other quarkonia and most open heavy flavour mesons. This first observation of the Bc+ meson in heavy ion collisions will shed light on the interplay of suppression and enhancement mechanisms in the production of heavy-flavor mesons in the quark-gluon plasma.

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Lao, Hai-Ling, Fu-Hu Liu, and Bo-Qiang Ma. "Analyzing Transverse Momentum Spectra of Pions, Kaons and Protons in p–p, p–A and A–A Collisions via the Blast-Wave Model with Fluctuations." Entropy 23, no. 7 (2021): 803. http://dx.doi.org/10.3390/e23070803.

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Abstract (sommario):

The transverse momentum spectra of different types of particles, π±, K±, p and p¯, produced at mid-(pseudo)rapidity in different centrality lead–lead (Pb–Pb) collisions at 2.76 TeV; proton–lead (p–Pb) collisions at 5.02 TeV; xenon–xenon (Xe–Xe) collisions at 5.44 TeV; and proton–proton (p–p) collisions at 0.9, 2.76, 5.02, 7 and 13 TeV, were analyzed by the blast-wave model with fluctuations. With the experimental data measured by the ALICE and CMS Collaborations at the Large Hadron Collider (LHC), the kinetic freeze-out temperature, transverse flow velocity and proper time were extracted from fitting the transverse momentum spectra. In nucleus–nucleus (A–A) and proton–nucleus (p–A) collisions, the three parameters decrease with the decrease of event centrality from central to peripheral, indicating higher degrees of excitation, quicker expansion velocities and longer evolution times for central collisions. In p–p collisions, the kinetic freeze-out temperature is nearly invariant with the increase of energy, though the transverse flow velocity and proper time increase slightly, in the considered energy range.

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Song, Wen-Yi, and Wendy Taylor. "Pair production of magnetic monopoles and stable high-electric-charge objects in proton–proton and heavy-ion collisions." Journal of Physics G: Nuclear and Particle Physics 49, no. 4 (2022): 045002. http://dx.doi.org/10.1088/1361-6471/ac3dce.

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Abstract (sommario):

Abstract We describe pair-production models of spin-0 and spin-½ magnetic monopoles and high-electric-charge objects (HECOs) in proton–proton (pp) and heavy-ion collisions, considering both the Drell–Yan (DY) and the photon-fusion processes. In particular, we extend the DY production model of spin-½ HECOs to include Z 0-boson exchange for pp collisions. Furthermore, we explore spin-½ and, for the first time, spin-0 production in ultraperipheral heavy-ion collisions. With matrix element calculations and equivalent photon fluxes implemented in MadGraph5_aMC@NLO, we present leading-order production cross sections of these mechanisms in s = 14 TeV pp collisions and s NN = 5.5 TeV ultraperipheral lead–lead collisions at the LHC. While the mass range accessible in ultraperipheral lead–lead collisions is much lower than that in pp collisions, we find that the theoretical production cross sections are significantly enhanced in the former for masses below 82 GeV.

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Bartsch, Esther. "Results on light (anti)hypernuclei production with ALICE at the LHC." Journal of Physics: Conference Series 2586, no. 1 (2023): 012014. http://dx.doi.org/10.1088/1742-6596/2586/1/012014.

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Abstract (sommario):

Abstract The high collision energies reached at the LHC lead to significant production yields of light (anti)hypernuclei in proton–proton (pp), proton–lead (p–Pb) and, in particular, Pb–Pb collisions. The lightest known hypernucleus is the hypertriton, which is a bound state of a proton, a neutron, and a Λ hyperon. It decays weakly with a decay length of a few centimeters. The excellent tracking and particle identification capabilities of the ALICE detector, exploiting the energy loss measurement of the Time Projection Chamber (TPC) and using the Inner Tracking System (ITS) to distinguish between primary and secondary (decay) vertices, allow for the determination of the hypertriton yield across different collision systems, its lifetime, and its binding energy. The latest hypertriton lifetime measurement in Pb–Pb collisions performed in the 2-body decay channel will be presented. This measurement contributes to the solution of the hypertriton lifetime puzzle. In addition, the hypertriton production in different collision systems and at different energies will be compared to model predictions. Due to its low binding energy, and hence to its large size, the hypertriton is the ideal candidate to distinguish between statistical hadronization and coalescence models. With the precision of the presented yield measurements some variants of the aforementioned models can be excluded.

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Salgado, Carlos A., and Johannes P. Wessels. "Proton–Lead Collisions at the CERN LHC." Annual Review of Nuclear and Particle Science 66, no. 1 (2016): 449–73. http://dx.doi.org/10.1146/annurev-nucl-102014-022110.

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