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

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Aug 31, 2022 299 likes •341 views

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

SLIDE 1

Panos.Christakoglou@nikhef.nl

Looking for the early stage magnetic field in heavy ion collisions

1

V. Skokov et al., Int. J. Mod. Phys. A 24 (2009)
U. Gürsoy et al., Phys. Rev. C89, (2014) 054905

Animation @ http:// www.physics.adelaide.edu.au/ theory/staff/leinweber/VisualQCD/ Nobel/

E. Shuryak World Sci. Lect. Notes Phys. 8 (1988)
D. Kharzeev et al., Phys. Rev. Lett. 81 (1998) 512

Novel QCD phenomena associated with parity violation in strong interactions (Chiral Magnetic Effect - CME) “Catalysed” by the presence of the strongest magnetic field in nature (~1018 Gauss)

Highlight from ALICE

Panos Christakoglou for the Nikhef/UU ALICE group

SLIDE 2

Panos.Christakoglou@nikhef.nl

B-field lifetime - QGP conductivity

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

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U. Gürsoy et al., Phys. Rev. C89, (2014) 054905

0.5 1.0 1.5 2.0 t @fmD 10-5 10-4 0.001 0.01 0.1 1

eBy @fm-2D

σ = 0.023fm-1 σ = 0

SLIDE 3

Panos.Christakoglou@nikhef.nl

Experimental probe: charge dependent vn

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 vn 3

U. Gürsoy et al., Phys. Rev. C98, (2018) 055201

x z

B (ALICE Collaboration), arXiv:1910.14406 Δv1 ≠ 0 with a 2.6σ significance Δv1 ≠ 0 with a 2.7σ significance

Δ Run 3 projection Charged particles D-mesons (early time)

SLIDE 4

Panos.Christakoglou@nikhef.nl