Essays about: "top quark mass"

Showing result 1 - 5 of 14 essays containing the words top quark mass.

1. 1. Constraining the Higgs width in Higgs production associated with a top quark pair

   University essay from Lunds universitet/Fysiska institutionen; Lunds universitet/Teoretisk partikelfysik - Geonomgår omorganisation

   Author : Benjamin Dahlén; [2023]
   Keywords : Higgs; width; cross section; on-shell; off-shell; invariant mass; Standard model; upper bound; Physics and Astronomy;

   Abstract : In this thesis we study the width of the Higgs boson in the process pp → t ̄t 4l at LO using MadGraph5_aMC@NLO to generate the events. The contributions including the Higgs signal, continuum background and interference were considered in order to calculate the expected number of events in a broad range of four-lepton invariant masses. READ MORE

3. 2. Spin correlations in top quark pair production at the Large Hadron Collider

   University essay from Lunds universitet/Teoretisk partikelfysik - Geonomgår omorganisation

   Author : Simon Ahlstedt; [2022]
   Keywords : Top quarks; Top quark pair production; LHC; Spin correlations; MadGraph5_aMC@NLO; Dilepton decay channel; Leading order; Interference effects; Event generation.; Physics and Astronomy;

   Abstract : In this work we investigate the spin correlation effect of the interference between signal and irreducible background events present in top quark pair production at the LHC at LO in the dilepton channel. To simulate the high energy proton-proton collisions of the LHC, MadGraph5_aMC@NLO framework is used as an event generator. READ MORE

4. 3. Di-Higgs Production in the Standard Model and Beyond

   University essay from Stockholms universitet/Fysikum

   Author : Hanna Brännström; [2021]
   Keywords : ATLAS; CERN; Higgs; partikelfysik; di-Higgs;

   Abstract : This thesis examines how the kinetic properties of pair-produced Higgs bosons depend on whether the process is mediated by particles in the Standard Model or a simplified supersymmetric model. The analysis is based on simulated data made using MadGraph. READ MORE

5. 4. Phenomenology of Exotic Decays of Vector-Like Quark X5/3 into Doubly-Charged ScalarXinto Doubly-Charged Scalar

   University essay from Uppsala universitet/Högenergifysik

   Author : Jakub Salko; [2020]
   Keywords : ;

   Abstract : Searches for the Vector-Like Quarks usually look for their signatures assuming they decay purely into Standard Model particles. In this paper, we explore one possible exotic decay of the Vector-Like Quark with electric charge +5/3, X5/3. READ MORE

6. 5. Reconstruction of challenging signatures characteristic to new physics beyond the Standard Model

   University essay from Uppsala universitet/Högenergifysik

   Author : Timmy Lindgren; [2020]
   Keywords : Reconstruction; Identification; photon-jets; ATLAS;

   Abstract : A study of photon-jets and their identification variables computed in the electromagnetic calorimeter of an in-house, ATLAS-like, detector model developed at Uppsala University for full-simulations is presented. The signal, which is based on the Composite Higgs Model, considers the pair production of vector-like top quarks, denoted t', with the successive decays t' to S and a Standard Model top quark and S to two photons, where S is a new pseudo-scalar boson. READ MORE