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SUMMARY:Signature and application of magnetic field in relativistic heavy-
 ion collisions
DTSTART:20260409T090000Z
DTEND:20260409T100000Z
DTSTAMP:20260504T074600Z
UID:indico-event-9317@scitalks.tifr.res.in
DESCRIPTION:Speakers: Amaresh Jaiswal (NISER)\n\nHeavy quarks produced in 
 early hard scatterings serve as sensitive probes of the early electromagne
 tic fields and geometry of the quark–gluon plasma in relativistic heavy-
 ion collisions. I discuss the rotational Brownian motion of heavy-quark sp
 ins in the QCD medium and its consequences for the polarization of open he
 avy-flavor hadrons. Analytical expressions are obtained for vector and ten
 sor polarization\, relevant for baryon spin polarization and vector-meson 
 spin alignment. Assuming an initial heavy-quark polarization generated by 
 strong magnetic fields in off-central collisions\, we show that interactio
 ns with the medium lead to momentum-dependent depolarization\, and compare
  the results with recent ALICE Collaboration measurements of D*+ spin alig
 nment. We further propose polarization harmonics of open heavy hadrons as 
 a new observable sensitive to the initial geometric anisotropies of the fi
 reball. Their azimuthal modulation encodes path-length dependent spin rela
 xation and provides a complementary probe of the early-time dynamics and g
 eometry of heavy-ion collisions.Having established the observable signals 
 of magnetic fields in relativistic heavy ion collisions\, I discuss the ap
 plication of this strong field environment to study CP violation in weak i
 nteractions. In particular\, I consider tau leptons created in ultraperiph
 eral heavy ion collisions (UPCs) and its subsequent weak decay. The strong
  field environment in UPCs lead to production of spin polarized tau+ and t
 au- leptons\, and the relative anisotropy of their decay distributions pro
 vides a novel CP-violating observable that may be accessible at the LHC. T
 his establishes UPCs as a novel arena for testing scenarios of physics bey
 ond the Standard Model.\n\nhttps://scitalks.tifr.res.in/event/9317/
LOCATION:A 304 and On Zoom
URL:https://scitalks.tifr.res.in/event/9317/
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