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SUMMARY:Brendon Bullard\, Eleni Vryonidou\,"Higgs top coupling and CP meas
 urement in the Higgs top sector" [ATLAS\, THEORY]
DTSTART:20260702T090000Z
DTEND:20260702T110000Z
DTSTAMP:20260625T045300Z
UID:indico-event-1693638@indico.cern.ch
DESCRIPTION:Speakers: Brendon Bullard (SLAC National Accelerator Laborator
 y (US))\, Eleni Vryonidou (University of Cyprus (CY))\n\nAbstract:\nThe ta
 lk will describe recent progress on searching for new sources of CP violat
 ion in the top-Higgs coupling. The focus will be on constraining CP mixing
  through tree-level associated production of the Higgs boson with one or t
 wo top quarks\, studied through effective field theory operators. A theore
 tical overview will cover constraining power from the construction of CP-o
 dd observables in the associated top-Higgs production modes [arxiv:2412.10
 309]. Additional sensitivity derived through the loop-level gluon-fusion p
 roduction process will also be discussed. \nA recent result from ATLAS [a
 rxiv:2606.04855] comprehensively studies the top-Higgs coupling by simulta
 neously measuring ttH and tH production rates in the diphoton final state.
  The measurement is performed using 164 fb$^{-1}$ from Run 3\, and is comb
 ined with the previous Run 2 analysis to constrain the top Yukawa coupling
  and its CP mixing angle\, rejecting the CP-odd scenario with a significan
 ce of over 5 sigma. The measurement provides the most stringent direct con
 straints on the CP structure of the top-Higgs Yukawa interaction to date.\
 nBrendon Bullard:\nBullard is a research associate at SLAC and is a member
  of the ATLAS collaboration. His physics interests are focused on understa
 nding the role of the Higgs boson in early universe cosmology through meas
 urements of the Higgs self-coupling and top quark Yukawa coupling. He obta
 ined his PhD at Harvard University in 2022 with the first differential cro
 ss section measurement of ttW production. He leads development of machine 
 learning models for b-jet reconstruction and contributes to construction o
 f the innermost layers of the ATLAS ITk pixel detector upgrade at SLAC.\nE
 leni Vryonidou:Eleni Vryonidou is an Assistant Professor working in collid
 er phenomenology at the University of Cyprus. Before joining the Universit
 y of Cyprus she held an academic position at the University of Manchester.
  Her work focuses on Effective Field Theory. In particular she has worked 
 extensively on higher-order computations and global interpretations of dat
 a within the EFT framework. She is also interested in CP-violation and in 
 how this can be probed at colliders through CP-sensitive observables in th
 e Higgs and top sectors.  \n\nhttps://indico.cern.ch/event/1693638/
LOCATION:4/2-011 - TH common room (CERN)
URL:https://indico.cern.ch/event/1693638/
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