The QED scattering amplitude and cross section of $\gamma \gamma \rightarrow \gamma \gamma \gamma \gamma $ are calculated. The lowest order of this process appears in sixth order of the S-Matrix in which each photon interact with the other by creation of pair massive virtual fermions in the vacuum. This can be applied to calculation of the sixth-rank vacuum polarization tensor vector boson.
This project aims to study the possibility of some interactions among three types of particles, i.e., electrons, positrons, and photons, from quantum perspective. The transition amplitudes of which the squares are occurring probability for some interactions are investigated. Despite having a simple method of Feynman diagram and Feynman rule, in this work, the transition amplitudes are...
At the Compact Muon Solenoid (CMS), both Standard Model (SM) and Beyond Standard Model (BSM) physics processes can result the final states with charm quark jets. Charm quarks hadronize to D mesons which could travel some distance in the CMS silicon tracker before decaying into showers of detectable particles, called jets. Consequently, charm jets can be distinguished by particular properties...
A search for a new narrow resonance decaying to an electron pair or a muon pair is performed using 13 TeV pp collision data collected by the CMS experiment at the CERN. The electron event sample used corresponds to an integrated luminosity of 2.6 fb$^{-1}$ while the muon event sample used corresponds to an integrated luminosity of 2.8 fb$^{-1}$. No evidence for such a resonance is observed...
