Conveners
PA-Other topics
- Matteo Buzzegoli (INFN)
PA-Other topics
- Youngman Kim (IBS)
PA-Other topics
- Dániel Barta (Wigner RCP)
PA-Other topics
- Aleksas Mazeliauskas (CERN)
The Anomalous Viscous Fluid Dynamics model, AVFD, is used in concert with the charge-sensitive correlator $R_{\Psi_2}(\Delta S)$ to study the scaling properties of background- and chiral-magnetically-driven (CME) charge separation ($\Delta S$), characterized by the inverse variance $\mathrm{\sigma^{-2}_{R_{\Psi_2}}}$ of the $R_{\Psi_{2}}(\Delta S)$ distribution, in Au+Au, Ru+Ru, and Zr+Zr...
Recently, STAR reported the isobar (${^{96}_{44}\text{Ru}}+{^{96}_{44}\text{Ru}}$, ${^{96}_{40}\text{Zr}}+{^{96}_{40}\text{Zr}}$) results for the chiral magnetic effect (CME) search [1]. The Ru+Ru to Zr+Zr ratio of the CME-sensitive observable $\Delta\gamma$, normalized by elliptic anisotropy ($v_{2}$), is observed to be close to the inverse multiplicity ($N$) ratio. In other words, the ratio...
Photon-photon and photonuclear reactions are induced by the strong electromagnetic field generated by ultra-relativistic heavy-ion collisions. These processes have been extensively studied in ultra-peripheral collisions with impact parameters larger than twice the nuclear radius. Since a few years, both the photoproduction of the J/ψ vector meson and the production of dileptons via...
Electromagnetic probes such as photons and dielectrons are a unique tool to study the space-time evolution of the hot and dense matter created in ultra-relativistic heavy-ion collisions. They are produced by a variety of processes during all stages of the collision with negligible final-state interactions. At low dielectron invariant mass ($m_{\rm ee}$), thermal radiation from the hot hadron...
Drell-Yan process is considered as one of the essential probes to understand the initial state of the nucleons presented as the parton distribution function (PDF) for stand-alone nucleon and nuclear PDF (nPDF) for confined nucleon in the nucleus. In LHC era, Z and W boson productions in pPb and PbPb collisions have been used to investigate the initial state effects. In this presentation, we...
Ultraperipheral lead-lead collisions at $\sqrt{s_{_{\mathrm{NN}}}} =$ 5.02 TeV produce very large photon fluxes that fundamental quantum-mechanical processes can be observed and well studied. Measurements of tau lepton pair in ultraperipheral PbPb collisions with data collected by CMS during the LHC Run 2 will be presented for the first time. The measurement paves the way for the determination...
The exclusive photoproduction of vector mesons provides a unique opportunity to constrain the gluon distribution function within protons and nuclei. Measuring vector mesons of various masses over a wide range of rapidity and as a function of transverse momentum provides important information on the evolution of the gluon distribution within nuclei. A variety of measurements, including the...
Electroweak W and Z bosons created in hard-scattering processes at the early stage of the collisions are efficient probes of the initial state of the collisions. While the measurements of W and Z bosons in p–Pb and Pb–Pb collisions provide insights on the nuclear modification of the parton distribution functions, the results in pp collisions are a stringent test of perturbative QCD-based...
The formalism of Baier-Dokshitzer-Mueller-Peigné-Schiff and Zakharov (BDMPS-Z) determines modifications of parton splittings in the QCD plasma that arise from medium-induced gluon radiation. Here, we extend the BDMPS-Z formalism to medium-modifications of the gluon splitting into two massive quarks of mass m. We derive a compact path-integral formulation that resums effects from arbitrary many...
Neutron stars harbor extreme conditions unattainable in terrestrial laboratories,
making them ideal candidates to study the equation of state (EoS) of strongly interacting matter. Advancements in the measurements of neutron star masses, radii
and tidal deformabilities through electromagnetic and gravitational wave observations have made it feasible to add further...
In the journey to explore the strong interaction among hadrons, ALICE has for the first time flared out its femtoscopic studies to nuclei. The large data sample of high-multiplicity pp collisions at $\sqrt{s}$ = 13 TeV allows the measurement of the proton-deuteron (p-d), the kaon-deuteron (K$^\pm$-d), and the Lambda-deuteron ($\Lambda$-d) momentum correlations. The femtoscopic study of these...
Strong electromagnetic field arising from the Lorentz-contraction and a large number of charges (Z) in the colliding nuclei at ultrarelativistic speeds can generate a large flux of quasi-real photons. Consequent photon-induced interactions could reasonably explain the observed enhancements of $J/\psi$ and $e^{+}e^{-}$ pair productions at very low transverse momenta ($p_{T}$) in peripheral...
Space: the final frontier for antinuclei physics. There, antinucleosynthesis models already tested on the bench of hadronic colliders and particle physics experiments are put at work to crack one of the biggest problems of modern physics: the existence and nature of dark matter.
In fact, the observation of an antinucleus in cosmic rays would most probably mean a breakthrough in searches for...
Measurements of quarkonia production in peripheral and ultra-peripheral heavy-ion collisions are sensitive to photon-photon and photon-nucleus interactions, the partonic structure of nuclei, and to the mechanisms of vector-meson production. LHCb has studied both coherent and incoherent production of $J/\psi$ mesons in peripheral and ultra-peripheral collisions using PbPb data at forward...
The unique forward coverage of the LHCb spectrometer allows the valence quark distributions of protons and nuclei to be probed with unprecedented precision. In this high-$x$ region, both the flavor content and structure of the nucleon's parton distribution functions remain relatively poorly known. New LHCb measurements of $Z$+charm jet production could be indicative of a valence-like...
Hydrodynamic models are a central component of nuclear collision phenomenology. In this talk, I show that relativistic causality is violated in the early stages of state-of-the-art heavy-ion hydrodynamic simulations of nuclear collisions. Up to 75% of the initial fluid cells violate nonlinear causality constraints, while superluminal propagation is observed by up to 15% the speed of light....
We present that the large single transverse spin asymmetry for the pion production in the very forward direction is diffractively produced. The differential cross section of the $p+p^\uparrow \to \pi^0+X$ can be expressed in terms of hybridized Regge amplitude and inclusive proton-baryon processes $A_{pB \to X}$. The interference of $p$ and $\Delta(1700)$ turns out to be dominant to $A_N$. In...
