Sökning: "on-shell"
Visar resultat 1 - 5 av 9 uppsatser innehållade ordet on-shell.
1. Constraining the Higgs width in Higgs production associated with a top quark pair
Kandidat-uppsats, Lunds universitet/Fysiska institutionen; Lunds universitet/Teoretisk partikelfysik - Geonomgår omorganisationSammanfattning : 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. LÄS MER
2. The Higgs Width in Higgs production in association with a W+ boson
Kandidat-uppsats, Lunds universitet/Fysiska institutionen; Lunds universitet/Teoretisk partikelfysik - Geonomgår omorganisationSammanfattning : 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. LÄS MER
3. Calculating scattering amplitudes in φ3 and Yang-mills theory using perturbiner methods
L3-uppsats, Uppsala universitet/Teoretisk fysikSammanfattning : 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. LÄS MER
4. The double-copy method for supergravity amplitudes
Master-uppsats, Uppsala universitet/Teoretisk fysikSammanfattning : 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. LÄS MER
5. Simulations of the response of concrete structures subjected to air blasts
Uppsats för yrkesexamina på avancerad nivå, Lunds universitet/ByggnadsmekanikSammanfattning : 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. LÄS MER