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PRODID:UW-Madison-Physics-Events
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SEQUENCE:1
UID:UW-Physics-Event-4781
DTSTART:20180410T203000Z
DURATION:PT1H0M0S
DTSTAMP:20260419T002747Z
LAST-MODIFIED:20180302T193124Z
LOCATION:5280 Chamberlin Hall
SUMMARY:Disentangling the Top-Higgs Yukawa CP Structure in the Dilepto
 nic tth with M2-?Assisted reconstructions\, Theory Seminar (High Energ
 y/Cosmology)\, Jeong Han Kim\, University of Kansas
DESCRIPTION:The top quark plays a crucial role in the production and t
 he decays of the Higgs boson\, and its Yukawa coupling is constrained 
 by various indirect precision measurements but only via loop-effects. 
 Therefore it is imperative to make a direct measurement of the Top qua
 rk Yukawa coupling. In particular\, an additional source of CP violati
 on in new physics beyond the standard model may induce the pseudo-scal
 ar component in the Top-Higgs interaction and there are many proposals
  to measure the relative contribution of CP-even and CP-odd interactio
 ns. Since the CP admixture property may be best measured in the center
 -of-mass frame of either tth or tt system\, the majority of currently 
 available methods examine the CP nature in either hadronic or semi-lep
 tonic final states. Existing studies in the dilepton final state are p
 erformed in the laboratory frame\, which provides limited information 
 on this interaction. In this paper\, we investigate the Top-Higgs Yuka
 wa interaction in the dilepton final state and attempt full kinematic 
 reconstructions of both top quarks\, which allows to Lorentz-boost to 
 any frame of our interest. We first study event reconstructions at par
 ton level and show that the kinematic correlations survive even after 
 inclusion of more realistic effects such as a parton-shower and hadron
 ization. As a result\, we present the required luminosity at the HL-LH
 C\, to distinguish the SM Higgs from an arbitrary CP state\, based on 
 a binned log-likelihood method.
URL:https://www.physics.wisc.edu/events/?id=4781
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