Modification of $Z^0$ leptonic invariant mass in ultrarelativistic heavy ion collisions as a measure of the electromagnetic field

Abstract

An extraordinary strong magnetic field, $e{B}_0\approx 10^{18}$ Gauss, is expected to be generated in non-central ultrarelativistic heavy ion collisions and it is envisaged to induce several effects on hot QCD matter including the possibility of local parity and local parity and charge conjugation symmetry violations. A direct signature of such e.m. fields and a first quantitative measurement of its strength and lifetime are still missing. We point out that both the mean value of leptonic invariant mass of $Z^0$ boson, reconstructed by its decaying lepton pairs, and the relative width are modified in relativistic heavy ion collisions due to the presence of strong initial e.m. fields. We propose a measurement of the leptonic invariant mass of $Z^0$ as a novel probe of the strength of the $B_y$. Both shifts could be up to about few hundred MeV and are found to depend on the integral of $B_y$ over the time duration quadratically (approximate). Hence it provides a novel and clear probe of electromagnetic fields, which can be tested experimentally.

arXiv comment6 pages, 6 figures

References in corpus (26)

• Experimental and Theoretical Challenges in the Search for the Quark Gluon Plasma: The STAR Collaboration's Critical Assessment of the Evidence from RHIC Collisions
• Formation of dense partonic matter in relativistic nucleus-nucleus collisions at RHIC: Experimental evaluation by the PHENIX collaboration
• Viscosity in Strongly Interacting Quantum Field Theories from Black Hole Physics
• The effects of topological charge change in heavy ion collisions: "Event by event P and CP violation"
• Viscosity Information from Relativistic Nuclear Collisions: How Perfect is the Fluid Observed at RHIC?
• Event-by-event generation of electromagnetic fields in heavy-ion collisions
• Hydrodynamic Modeling of Heavy-Ion Collisions
• Possibility of spontaneous parity violation in hot QCD
• Magnetohydrodynamics, charged currents and directed flow in heavy ion collisions
• Global hyperon polarization at local thermodynamic equilibrium with vorticity, magnetic field and feed-down
• Chiral magnetic wave at finite baryon density and the electric quadrupole moment of quark-gluon plasma in heavy ion collisions
• Electrical conductivity of the quark-gluon plasma across the deconfinement transition
• Topologically induced local P and CP violation in QCD x QED
• Directed Flow of Charm Quarks as a Witness of the Initial Strong Magnetic Field in Ultra-Relativistic Heavy Ion Collisions
• Anomalous Chiral Transport in Heavy Ion Collisions from Anomalous-Viscous Fluid Dynamics
• Charge-dependent Flow Induced by Magnetic and Electric Fields in Heavy Ion Collisions
• Magnetic Field Induced Polarization Difference between Hyperons and Anti-hyperons
• Probing the effects of strong electromagnetic fields with charge-dependent directed flow in Pb-Pb collisions at the LHC
• Quantifying Chiral Magnetic Effect from Anomalous-Viscous Fluid Dynamics
• Effect of intense magnetic fields on reduced-MHD evolution in $\sqrt{s_{\mathrm{NN}}}$ = 200 GeV Au+Au collisions
• Study of Z boson production in pPb collisions at sqrt(s[NN]) = 5.02 TeV
• Acoplanarity of Lepton Pair to Probe the Electromagnetic Property of Quark Matter
• Interplay of drag by hot matter and electromagnetic force on the directed flow of heavy quarks
• Chiral kinetic approach to the chiral magnetic effect in isobaric collisions
• Investigating different $\Lambda$ and $\bar{\Lambda }$ polarizations in relativistic heavy-ion collisions
• The signature of charge dependent directed flow observables by electromagnetic fields in heavy ion collisions

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