Prospects for Higgs boson & top quark measurements and applications of digital calorimetry at future linear colliders

• Main Author: Winter, Alasdair
• Published: University of Birmingham 2018
• Subjects: 500; QC Physics
• Online Access: https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.760347

Within the next few years a decision must be made by the global community on what type of high energy colliders should be built in the post LHC era. Here we present studies showing what might be achieved if a linear lepton collider such as Compact Linear Collider ( CLIC ) is chosen. Two physics studies are presented showing the precision achievable in the electroweak sector when operating at 1.4 TeV. Firstly the measurement of σ Hν ν̄ × BR(H → W W ∗ ), an integral component for model independent Higgs measurements, is described using the semileptonic decay channel and is shown to yield a statistical precision of 1.3% for 1.5 ab −1 of data. A differential measurement of the top quark forward backward asymmetry is also performed as a probe of the electroweak form factors of the ttX vertex yielding a statistical precision of O(1%) for 1.5 ab −1 of data. Lastly, the potential for using a novel design of a Digital Electromagnetic Calorimeter ( DECAL ) at the International Linear Collider ( ILC ) is studied showing that an energy resolution ofσ E⁄E=16.1 "\%"⁄E⊕0.5 "\%"⁄E⊕0.4"\%" be achieved, similar to what is seen for the standard design choice, when using 30 μm pitch pixels with a 12 μm epitaxial thickness.