Essays about: "on-shell"

Showing result 1 - 5 of 9 essays containing the word on-shell.

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. The Higgs Width in Higgs production in association with a W+ boson

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

   Author : Wijeratne Mohandiramge Umashi Navisha Fernando; [2023]
   Keywords : Higgs boson; Higgs width; off-shell; on-shell; narrow-width approximation; MadGraph5_MC@NLO; W boson; supersymmetry; dark matter; Physics and Astronomy;

   Abstract : The width of the Higgs boson is a quantity that cannot be measured directly from the on-shell Higgs peak; it would have to be measured indirectly. In 2013, Caola and Melnikov developed a method to determine the Higgs width by using off-shell and on-shell cross-sections and applying the narrow-width approximation. READ MORE

4. 3. Calculating scattering amplitudes in φ3 and Yang-mills theory using perturbiner methods

   University essay from Uppsala universitet/Teoretisk fysik

   Author : Daniel Nilsson; Magnus Bertilsson; [2022]
   Keywords : QFT; Quantum; Quantum field theory; scattering amplitudes; Berends Giele Currents; feynman diagrams; n particle scattering;

   Abstract : We calculate tree-level scattering amplitudes in φ^3 theory and Yang-Mills theory by means of the perturbiner expansion. This involves solving the Euler-Lagrange equations of motion perturbatively via a multi-particle ansatz, and using Berends-Giele recursion relations to extract the solution from simple on-shell data. READ MORE

5. 4. The double-copy method for supergravity amplitudes

   University essay from Uppsala universitet/Teoretisk fysik

   Author : Maor Ben-Shahar; [2019]
   Keywords : Supergravity; quantum field theory; counterterm; amplitudes;

   Abstract : The double-copy construction enables the calculation of scattering amplitudes in theories of gravity by combining amplitudes from gauge theories. It relies on obtaining numerators that obey a duality between color and numerator factors, called color-kinematics duality. READ MORE

6. 5. Simulations of the response of concrete structures subjected to air blasts

   University essay from Lunds universitet/Byggnadsmekanik

   Author : Peter Svantesson; [2013]
   Keywords : Load blast; reinforced concrete; structural response; finite element analysis; LS-DYNA; LOAD BLAST ENHANCED; shell element; Technology and Engineering;

   Abstract : The response of concrete structures subjected to blast load can be studied numerically using commercial finite element programs. The complexity of reinforced concrete makes modeling and simulation of large structures time and computer power consuming. READ MORE