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SUMMARY:Quarkonium States in Strongly Magnetized Deconfined Matter of Comp
 act Astrophysical Objects
DTSTART;VALUE=DATE-TIME:20261027T162500Z
DTEND;VALUE=DATE-TIME:20261027T163000Z
DTSTAMP;VALUE=DATE-TIME:20261102T194945Z
UID:indico-contribution-6477@cern.ch
DESCRIPTION:Speakers: Viacheslav Zelenev (NRNU MEPhI)\nThe possible format
 ion of deconfined quark matter in the cores of massive neutron stars and m
 agnetars provides an extreme environment for studying quarkonium in ultra-
 strong magnetic fields. In this work\, quarkonium states and their annihil
 ation through the q q̅ → 2γ channel in hot magnetized quark matter are
  investigated\, taking into account Landau-level quantization and the inte
 raction with the surrounding thermal quark-antiquark medium. The thermal q
 uark-antiquark pairs are assumed to be produced through the decay (timelik
 e splitting) of virtual gluons in the deconfined medium.\n\nAn analytical 
 description of the annihilation width is developed\, with an extended form
 ulation including the full Landau-level structure\, screened interactions\
 , and relativistic thermal averaging. In the lowest-Landau-level ultrarela
 tivistic limit\, the thermally averaged width scales as  ∝ T⁴. In the 
 light-quark limit\, the two-photon annihilation channel is related to the 
 π⁰ → 2γ decay\, with a characteristic width of order 10 eV. Order-of
 -magnitude estimates give annihilation times of ~10⁶ years for light qua
 rks and ~1.5×10³ years for heavier quarks with m_q ≥ 100 MeV.\n\nThe l
 ight-quark timescale is comparable to the characteristic ~10⁶-year magne
 tic-field evolution timescale of a stable magnetar\, whereas heavy-quark s
 tates can annihilate much faster. This suggests that the q q̅ → 2γ cha
 nnel may play a more pronounced role in the thermalization of deconfined m
 atter for heavier quarks during the evolution of strongly magnetized compa
 ct astrophysical objects.\n\nhttps://indico.particle.mephi.ru/event/626/co
 ntributions/6477/
LOCATION:Sevastopol hotel Conference Hall 1
URL:https://indico.particle.mephi.ru/event/626/contributions/6477/
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