Probing the effects of strong electromagnetic fields with charge-dependent directed flow in Pb-Pb collisions at the LHC

Abstract

The first measurement at the LHC of charge-dependent directed flow ($v_1$) relative to the spectator plane is presented for Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV. Results are reported for charged hadrons and ${\mathrm{D}}^0$ mesons for the transverse momentum intervals $p_{\mathrm{T}}>0.2$ GeV/$c$ and $3<p_{\mathrm{T}}<$ 6 GeV/$c$ in the 5-40% and 10-40% centrality classes, respectively. The difference between the positively and negatively charged hadron $v_1$ has a positive slope as a function of pseudorapidity $\eta$, $\mathrm{d}\Delta v_1/\mathrm{d}\eta =$[1.68 $\pm$ 0.49 (stat.) $\pm$ 0.41 (syst.)] $\times 10^{-4}$. The same measurement for ${\mathrm{D}}^0$ and $\bar{\mathrm{D}}{}^0$ mesons yields a positive value $\mathrm{d}\Delta v_1/\mathrm{d}\eta$= [4.9 $\pm$ 1.7 (stat.) $\pm$ 0.6 (syst.)]$\times 10^{-1}$, which is about three orders of magnitude larger than the one of the charged hadrons. These measurements can provide new insights into the effects of the strong electromagnetic field and the initial tilt of matter created in non-central heavy-ion collisions on the dynamics of light (u, d, and s) and heavy (c) quarks. The large difference between the observed $\Delta v_1$ of charged hadrons and ${\mathrm{D}}^0$ mesons may reflect different sensitivity of the charm and light quarks to the early time dynamics of a heavy-ion collision. These observations challenge some of the recent theoretical calculations, which predicted a negative and an order of magnitude smaller value of $\mathrm{d}\Delta v_1/\mathrm{d}\eta$ for both light-flavour and charmed hadrons.

18 pages, 2 captioned figures, authors from page 13, published version, figures at http://alice-publications.web.cern.ch/node/5656

References in corpus (13)

• The Chiral Magnetic Effect
• The equation of state in (2+1)-flavor QCD
• The QCD equation of state with dynamical quarks
• The QCD Equation of State to $\mathcal{O}({\mu }_B^6)$ from Lattice QCD
• Charge conservation in RHIC and contributiuons to local parity violation observables
• Elliptic flow of identified hadrons in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Observation of charge-dependent azimuthal correlations in pPb collisions and its implication for the search for the chiral magnetic effect
• Directed flow in ultrarelativistic heavy-ion collisions
• Synchrotron radiation by fast fermions in heavy-ion collisions
• System-size independence of directed flow at the Relativistic Heavy-Ion Collider
• Effects of non-uniform acceptance in anisotropic flow measurement
• The QCD Equation of State to $\mathcal{O}({\mu }_B^4)$ from Lattice QCD
• Charge-dependent directed flow in Cu+Au collisions at $\sqrt{s_{{}_{NN}}}$ = 200 GeV

Cited by in corpus (61)

• The ALICE experiment: a journey through QCD
• Chiral magnetic effect reveals the topology of gauge fields in heavy-ion collisions
• A review of quarkonia under strong magnetic fields
• Polarization phenomenon in heavy-ion collisions
• Fluctuations and correlations of net baryon number, electric charge and strangeness in a background magnetic field
• Measurement of prompt ${\mathrm{D}}^0$ and ${\overline{\mathrm{D}}}^0$ meson azimuthal asymmetry and search for strong electric fields in PbPb collisions at $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV
• Properties of the QCD Matter: A Review of Selected Results from the ALICE Experiment
• Charge-dependent flow as evidence of strong electromagnetic fields in heavy-ion collisions
• Chiral Magnetic Effect in Heavy Ion Collisions: The Present and Future
• Probing the initial longitudinal density profile and electromagnetic field in ultrarelativistic heavy-ion collisions with heavy quarks
• Longitudinal distribution of initial energy density and directed flow of charged particles in relativistic heavy-ion collisions
• Baryon electric charge correlation as a magnetometer of QCD
• A fluid-dynamic approach to heavy-quark diffusion in the quark-gluon plasma
• Probing the electromagnetic fields in ultrarelativistic collisions with leptons from $Z^0$ decay and charmed mesons
• Exploring the effects of electromagnetic fields and tilted bulk distribution on directed flow of D mesons in small systems
• Charm and Bottom Hadrons in Hot Hadronic Matter
• Space-average electromagnetic fields and EM anomaly weighted by energy density in heavy-ion collisions
• Thermal and thermoelectric responses of hot QCD medium in time-varying magnetic fields
• Thermoelectric behaviour of hot collisional and magnetized QCD medium from an effective kinetic theory
• Dragging heavy quark in an anisotropic QCD medium beyond the static limit
• Thermomagnetic properties and Debye Screening for magnetized quark-gluon Plasma using the extended self-consistent quasiparticle model
• Directed flow of charged particles within idealized viscous hydrodynamics at energies available at the BNL Relativistic Heavy Ion Collider and at the CERN Large Hadron Collider
• Effect of time-varying electromagnetic field on Wiedemann-Franz law in a hot hadronic matter
• Electromagnetic response of hot QCD medium in the presence of background time-varying fields
• Thermal transport in a weakly magnetized hot QCD medium
• Heavy-Flavour Jets in High-Energy Nuclear Collisions
• Directed flow and global polarization in Au+Au collisions across energies covered by the beam energy scan at RHIC
• Response of a weakly magnetized hot QCD medium to inhomogeneous electric field
• Charge-dependent anisotropic flow in high-energy heavy-ion collisions from relativistic resistive magneto-hydrodynamic expansion
• Thermal conductivity of evolving quark-gluon plasma in the presence of a time-varying magnetic field
• Electric field induction in quark-gluon plasma due to thermoelectric effects
• Magnetic field-dependent electric charge transport in hadronic medium at finite temperature
• Impact of chiral asymmetry and magnetic field on passage of an energetic test parton in a QCD medium
• Revisiting shear stress tensor evolution: Non-resistive magnetohydrodynamics with momentum-dependent relaxation time
• Anisotropy of magnetized quark matter
• Magnetized AdS/BCFT Correspondence in Horndeski Gravity
• Towards the understanding of heavy quarks hadronization: from leptonic to heavy-ion collisions
• Heavy quarkonia in QGP medium in an arbitrary magnetic field
• Testing the impact of electromagnetic fields on the directed flow of constituent quarks in heavy-ion collisions
• Modification of $Z^0$ leptonic invariant mass in ultrarelativistic heavy ion collisions as a measure of the electromagnetic field
• Quantum color screening in external magnetic field
• Magnetic field induced hair structure in charmonium gluon-dissociation
• Ellipticity of dilepton production from a hot and magnetized hadronic medium
• Thermoelectric Thomson coefficient of quark-gluon plasma in the presence of a time-varying magnetic field
• Hydrodynamic simulations of directed flow for light hadrons in Au+Au and isobar collisions $\sqrt{s_{\text{NN}}}=$ 200 GeV
• External magnetic field induced paramagnetic squeezing effect in heavy-ion collisions at the LHC
• Nonperturbative heavy quark diffusion coefficients in a weakly magnetized thermal QCD medium
• The elliptic flow difference between baryons and anti-baryons in heavy collision with SMASH Model
• Interactions between heavy quarks and tilted QGP fireballs in 200 AGeV Au+Au collisions
• Manipulating strong electromagnetic fields with the average transverse momentum of relativistic nuclear collisions
• Charge-dependent flow induced by electromagnetic fields in heavy ion collisions
• Turning up and down strong magnetic fields in relativistic nuclear collisions
• Examining the influence of hadronic interactions on the directed flow of identified particles in RHIC Beam Energy Scan energies using UrQMD model
• Thermal Field Theory in the Presence of a Background Magnetic Field and its Application to QCD
• Production of leptons from decay of heavy-flavor hadrons in high-energy nuclear collisions
• Viscous effects of a hot QGP medium in time dependent magnetic field and their phenomenological significance
• Charming Charm, Beautiful Bottom, and Quark-Gluon Plasma in the Large Hadron Collider Era
• Directed flow of D and B mesons in an electrically and chirally conductive QGP at LHC energies
• Non-perturbative heavy quark diffusion coefficients in arbitrarily magnetized quark-gluon plasma
• Physics of strong electromagnetic fields in relativistic heavy-ion collisions
• Electromagnetic anomaly in the presence of electric and chiral magnetic conductivities in relativistic heavy-ion collisions