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SUMMARY:Experimental prospects for quantum decoherence measurements at col
 liders
DTSTART;VALUE=DATE-TIME:20261020T111000Z
DTEND;VALUE=DATE-TIME:20261020T113000Z
DTSTAMP;VALUE=DATE-TIME:20261012T012321Z
UID:indico-contribution-31605@indico.ific.uv.es
DESCRIPTION:Speakers: Guillermo García Mir (Univ. of Valencia and CSIC (E
 S))\nQuantum entanglement is one of the defining features of quantum mecha
 nics. In high-energy\ncolliders\, quantum properties are experimentally ac
 cessible\, the most important example being top\nquark pair production at 
 the LHC. This channel lead to the discovery of spin entanglement in 2024\n
 [1-2].\nIn this work [3]\, we study how energetic final-state radiation mo
 difies the spin entanglement of fermion–antifermion pairs\, and demonstr
 ate that it can lead to measurable decoherence. The study is performed at 
 parton level using simulations computed with MadGraph5_aMC@NLO\, using t t
 bar g\nand  tau+ tau- gamma production processes. The spin density matri
 x is reconstructed as a function of the\nFSR energy.\nWe conclude that a s
 tatistically significant observation of decoherence can be obtained with c
 urrent\ndata in associated pp -> t tbar g production at the LHC and in e+e
 - -> tau+ tau- gamma production at Belle II. Future electron-positron coll
 iders operating well above the t tbar g production threshold or at the Z p
 ole\, respectively\, could further enable differential measurements of qua
 ntum entanglement as a function of the FSR energy.\n[1] ATLAS Collaboratio
 n. Nature 633\, 542 (2024).\n[2] CMS Collaboration. PRD 110\, 112016 (2024
 ).\n[3] Aoude et. al. arXiv:2604.16268v3. Submitted to PRL.\n\nhttps://ind
 ico.ific.uv.es/event/8657/contributions/31605/
LOCATION:Delegacion del CSIC
URL:https://indico.ific.uv.es/event/8657/contributions/31605/
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