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SUMMARY:Quantum Entanglement Is Quantum: Insights from Diboson Systems at 
 LHC
DTSTART;VALUE=DATE-TIME:20260730T013000Z
DTEND;VALUE=DATE-TIME:20260730T023000Z
DTSTAMP;VALUE=DATE-TIME:20260801T165200Z
UID:indico-event-30368@indico.ihep.ac.cn
DESCRIPTION:Speakers: Ajay Kaladharan (ITP)\n Polarisation and spin corre
 lations in diboson systems are powerful probes for precision tests of the 
 Standard Model and searches for new physics. More recently\, viewing these
  observables through the lens of quantum information\, such as assessing w
 hether diboson systems exhibit quantum entanglement\, has opened a compell
 ing new frontier in these investigations. They also provide a unique oppor
 tunity to test quantum information principles at the highest accessible en
 ergy scales. We analyze the angular coefficients for the $pp \\to ZZ \\to 
 4 \\ell$ and Higgs decay to di-bosons $h \\to WW$ and $h \\to WW$\, incorp
 orating higher-order QCD and electroweak corrections. For Higgs decays\, w
 e consider both fully leptonic and semileptonic final states. Guided by th
 e fundamental properties of the spin density matrix\, we assess the stabil
 ity of the two-qutrit interpretation under radiative effects. For the $pp 
 \\to ZZ \\to 4 \\ell$ process\, NLO QCD corrections preserve the two-qutri
 t structure but weaken entanglement indicators\, an effect that can be par
 tially mitigated by jet binning. In contrast\, EW introduce non-factorizab
 le contributions that modify the quantum properties of the system.While th
 ese effects can be largely depleted by selecting events with a double-reso
 nant $ZZ$ structure\, such a kinematic handle is not available for Higgs d
 ecays. For $h \\to ZZ$\, channel\, singly-resonant NLO electroweak correct
 ions substantially distort the angular coefficients\, challenging the desc
 ription of these events as a two-qutrit system. These effects are milder f
 or $h \\to WW$ compared with $h \\to ZZ$. For both processes\, semileptoni
 c final states exhibit greater stability than fully leptonic final states.
 \nhttps://indico.ihep.ac.cn/event/30368/
LOCATION:B105 (CHEP)
URL:https://indico.ihep.ac.cn/event/30368/
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