Maria Mironova (Oxford) “First Direct Constraint on the Higgs-Charm Coupling and its Expected Evolution with the ATLAS Detector Upgrade”

Abstract:


The coupling of the Higgsboson to charm quarks has eluded experimental observation since the Higgs boson discovery in 2012. At present, this is the largest contribution to possibleHiggs boson decays that is not experimentally verified. However, this measurement is crucial to shed light on the fundamental coupling of the Higgs boson to second-generation quarks. This seminar highlights the recent search for Higgs boson decays into a pair of charm quarks, produced in association with a vector boson, using the data collected by the ATLAS detector between 2015 and 2018.This measurement sets the first direct limit on the Higgs boson coupling to charm quarks

With the upgrade to High-Luminosity LHC (HL-LHC), a significant improvement to this measurement is expected due to the increased size of the dataset as well as the upgrade of the ATLAS Inner Tracker (ITk). A new pixel detector system will improve resolution, increasing the identification efficiency of charm quarks. However, the detector will have to cope with higher data rates and withstand higher levels of radiation. The ITk pixel upgrade, particularly the characterisation of the pixel readout chips, and the expected precision of the measurement of the Higgs boson coupling to charm quarks at the HL-LHC are discussed.

 
 
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