Highlight from ALICE Looking for the early stage magnetic field in - PowerPoint PPT Presentation

Highlight from ALICE Looking for the early stage magnetic field in heavy ion collisions Novel QCD phenomena associated with “Catalysed” by the presence of parity violation in strong interactions the strongest magnetic field in (Chiral Magnetic Effect - CME) nature (~10 18 Gauss) Animation @ http:// www.physics.adelaide.edu.au/ theory/staff/leinweber/VisualQCD/ Nobel/ E. Shuryak World Sci. Lect. Notes Phys. 8 (1988) V. Skokov et al. , Int. J. Mod. Phys. A 24 (2009) D. Kharzeev et al. , Phys. Rev. Lett. 81 (1998) 512 U. Gürsoy et al. , Phys. Rev. C89 , (2014) 054905 Panos Christakoglou for the Nikhef/UU ALICE group Panos.Christakoglou@nikhef.nl 1

B-field lifetime - QGP conductivity U. Gürsoy et al. , Phys. Rev. C89 , (2014) 054905 eB y @ fm - 2 D 1 σ = 0.023fm -1 0.1 0.01 0.001 10 - 4 σ = 0 10 - 5 2.0 t @ fm D 0.5 1.0 1.5 The field decays rapidly Decay rate depends on the electric conductivity of the medium Conductivity depends (in principle) on temperature Poorly constrained so far by experiments Panos.Christakoglou@nikhef.nl 2

Experimental probe: charge dependent v n U. Gürsoy et al. , Phys. Rev. C98 , (2018) 055201 (ALICE Collaboration), arXiv:1910.14406 x Charged particles D-mesons (early time) Δ z B Δ v 1 ≠ 0 with a 2.6 σ significance Δ v 1 ≠ 0 with a 2.7 σ significance Run 3 projection Competing effects: Faraday + spectator Coulomb vs Lorentz force Initial stage E/M fields could affect the motion of particles ➞ experimentally accessible differences in charge dependent odd v n Panos.Christakoglou@nikhef.nl 3

Panos.Christakoglou@nikhef.nl 4