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2025-01-29
14:17
Measurements of top quark production cross-sections with the ATLAS detector / VANADIA, Marco (INFN, Rome ; Rome U., Tor Vergata) /ATLAS Collaboration
Top quarks are abundantly produced in collision events at the LHC, either as pairs or single quarks. Inclusive and differential cross section measurements for such events represent a crucial part of the physics program of the ATLAS Collaboration. [...]
2024 - 6 p. - Published in : PoS ICHEP2024 (2025) 353 Fulltext: PDF;
In : 42nd International Conference on High Energy Physics (ICHEP 2024), Prague, Czech Republic, 18 - 24 Jul 2024, pp.353

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2025-01-29
05:07
Are Parton Showers Inside a Quark-Gluon Plasma Strongly Coupled? A Theorist's Test / Arnold, Peter (Virginia U.) ; Elgedawy, Omar (Virginia U. ; South China Normal U. ; Cape Town U., Dept. Math. ; Guangzhou U.) ; Iqbal, Shahin (Quaid-i-Azam U. ; CERN)
We study whether in-medium showers of high-energy quarks and gluons can be treated as a sequence of individual splitting processes or whether there is significant quantum overlap between where one splitting ends and the next begins. Accounting for the Landau-Pomeranchuk-Migdal (LPM) effect, we calculate such overlap effects to leading order in high-energy $\alpha_s(\mu)$ for the simplest theoretical situation. [...]
arXiv:2501.15115; CERN-TH-2024-163.- 2024-12-17 - 7 p. - Published in : PoS: ICHEP2024 (2025) , pp. 582 Fulltext: 2501.15115 - PDF; document - PDF;
In : 42nd International Conference on High Energy Physics (ICHEP 2024), Prague, Czech Republic, 18 - 24 Jul 2024, pp.582

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2025-01-28
06:32
Modification of heavy quark hadronization in high-multiplicity collisions at LHCb / Gu, Chenxi (LLR, Palaiseau) /LHCb Collaboration
The baryon-to-meson and meson-to-meson production ratios of heavy quarks are well suited to study the hadronization mechanism. Here we will present LHCb results on the production ratios of $B_{s}^{0}/B^{0}$, $D_{s}^{+}/D^{+}$ and $\Lambda_{c}^{+}/D^{0}$ in differents collision systems. [...]
2024 - 6 p. - Published in : PoS HardProbes2023 (2024) 103 Fulltext: PDF;
In : 11th International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions (HP2023), Aschaffenburg, Germany, 26 - 31 Mar 2023, pp.103

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2025-01-28
06:32
First measurement of jet angularities with D$^0$-meson tagged jets with ALICE / Dhankher, Preeti (UC, Berkeley) /ALICE Collaboration
The properties of partonic fragmentation in QCD are dependent on the flavours of the partons involved in the 1$\rightarrow$2 splitting processes underpinning parton showers. These flavour dependencies arise due both to the different Casimir factors of quarks and gluons, as well as the mass of heavy quarks. [...]
2024 - 6 p. - Published in : PoS HardProbes2023 (2024) 140 Fulltext: PDF;
In : 11th International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions (HP2023), Aschaffenburg, Germany, 26 - 31 Mar 2023, pp.140

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2025-01-28
06:32
Observation of medium-induced yield enhancement and acoplanarity broadening of low-$p_{T}$ jets in pp and Pb-Pb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV with ALICE / Hou, Yongzhen (CCNU, Wuhan, Inst. Part. Phys. ; Strasbourg, IPHC) /ALICE Collaboration
We present the measurements of the semi-inclusive distributions of charged-particle jets recoiling from a trigger hadron in proton–proton (pp) and 0–10% Pb–Pb collisions at $\sqrt{s_\mathrm{NN}}=5.02$ TeV, searching for medium-induced yield enhancement and acoplanarity broadening effects in low transverse momentum ($p_{\rm T}$) jets. This technique provides precise data-driven subtraction of the large uncorrelated background yield in jet measurements, enabling the measurement of recoil jet distributions to the large jet radius at low $p_{\rm T}$ in central Pb--Pb collisions. [...]
2024 - 6 p. - Published in : PoS HardProbes2023 (2024) 137 Fulltext: PDF;
In : 11th International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions (HP2023), Aschaffenburg, Germany, 26 - 31 Mar 2023, pp.137

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2025-01-28
06:32
First performance results from upgraded LHCb and SMOG II / Lucarelli, Chiara (INFN, Florence ; Florence U.) /LHCb Collaboration
The LHCb experiment has recently undergone a series of major upgrades: the entire tracking system has been replaced with higher-granularity sensors, the readout electronics have been upgraded, and all hardware triggers have been replaced with a new state-of-the-art readout system. In addition, the gaseous target SMOG system has been upgraded with a dedicated storage cell to increase the rate of fixed target collisions at LHCb by up to two order of magnitude for the same gas flow as in the LHC Run 2 and to allow the injection of more gas species, including non-noble gases. [...]
2024 - 6 p. - Published in : PoS HardProbes2023 (2024) 196 Fulltext: PDF;
In : 11th International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions (HP2023), Aschaffenburg, Germany, 26 - 31 Mar 2023, pp.196

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2025-01-28
06:32
Studying the dynamics of particle-emitting sources in p–Pb and Pb–Pb collisions with ALICE at the LHC energies using femtoscopy / Romanenko, Gleb (Bologna U.) ; Tomassini, Sofia (Bologna U.) /ALICE Collaboration
Space–time properties of the quark–gluon plasma (QGP), a state of matter with unbound partons usually produced in heavy-ion collisions, can be studied using femtoscopic correlations of particle pairs emitted after the hadronization.In this talk, results of 1D and 3D femtoscopic analyses of identical charged kaon pairs are reported in p–Pb and Pb–Pb collisions at \( \sqrt{s_{\textrm{NN}}} = 5.02 \, \text{TeV} \) as carried out by ALICE. The multiplicity dependence of 1D radii, compared to other collision systems at different energies, disfavors models suggesting similar evolution for matter created in small and large collision systems. [...]
2024 - 6 p. - Published in : PoS ICHEP2024 (2025) 599 Fulltext: PDF;
In : 42nd International Conference on High Energy Physics (ICHEP 2024), Prague, Czech Republic, 18 - 24 Jul 2024, pp.599

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2025-01-28
06:32
Measurement of the deuteron coalescence probability in jets with ALICE / Rasà, Marika (Catania U.) /ALICE Collaboration
The microscopic production mechanism of light (anti)nuclei in high-energy hadronic collisions is still mysterious and is a highly debated topic in the scientific community. Two different phenomenological models are typically used to describe the experimental data: the statistical hadronization model and baryon coalescence. [...]
2024 - 6 p. - Published in : PoS HardProbes2023 (2024) 120 Fulltext: PDF;
In : 11th International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions (HP2023), Aschaffenburg, Germany, 26 - 31 Mar 2023, pp.120

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2025-01-28
06:32
J/𝜓 production and polarization in photon-induced reactions in Pb--Pb collisions with ALICE / Lavicka, Roman (OAW, Vienna) /ALICE Collaboration
Intense electromagnetic fields from ultrarelativistic heavy ions can trigger photonuclear reactions, which are used to probe the nuclear gluon distribution and gluonic fluctuations over a large range of Bjorken-$x$. Our study examines ultra-peripheral and nuclear-overlap collisions, reporting on the photoproduction of J/$\psi$ in peripheral Pb$-$Pb collision. [...]
2024 - 6 p. - Published in : PoS ICHEP2024 (2025) 595 Fulltext: PDF;
In : 42nd International Conference on High Energy Physics (ICHEP 2024), Prague, Czech Republic, 18 - 24 Jul 2024, pp.595

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2025-01-28
06:32
Thermal radiation and direct photon production in Pb–Pb and pp collisions with dielectrons / Bailhache, Raphaelle (Frankfurt U.) /ALICE Collaboration
Electromagnetic probes such as photons and dielectrons (${\rm e^{+}e^{-}}$ pairs) are a unique tool to study the space-time evolution of the hot and dense matter created in ultrarelativistic heavy-ion collisions. At low dielectron invariant mass ($m_{\rm ee}$), thermal radiation from the hot hadronic phase contributes to the dielectron spectrum via decays of $\rho$ mesons, whose spectral function is sensitive to chiral-symmetry restoration. [...]
2024 - 6 p. - Published in : PoS HardProbes2023 (2024) 060 Fulltext: PDF;
In : 11th International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions (HP2023), Aschaffenburg, Germany, 26 - 31 Mar 2023, pp.060

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