By Priscila de Aquino
This thesis presents an creation to the physics of the normal version and past, and to the tools used to examine huge Hadron Collider (LHC) info. The 'hierarchy problem', astrophysical information and experiments on neutrinos point out that new physics should be anticipated on the now obtainable TeV scale. This paintings investigates extensions of the traditional version with gravitons and gravitinos (in the context of supergravity). The construction of those debris in organization with jets is studied as some of the most promising avenues for learning new physics on the LHC. complicated simulation ideas and instruments, similar to algorithms permitting the computation of Feynman graphs and helicity amplitudes are first built after which employed.
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Extra info for Beyond Standard Model Phenomenology at the LHC
The discontinuity existent for the propagator of a spin-2 particle vanishes at cross section level when processes with an on-shell graviton are considered. The smoothness of this limit has been pointed out in several references, including . Particularly, Mirabelli et al. have pointed out that due to helicity conservation, 44 3 Gravitation in Beyond Standard Model Theories only the polarization modes that correspond to the massless graviton are produced in the reaction being analysed. However, in order to understand theoretically the smoothness of this limit, we have carried out a small calculation that verifies it for the q q¯ → gG process.
67) propagators are compared, one can realize a difference in the last term, which appears even in the limit where m → 0: i P˜ μν,αβ = lim Pμν,αβ = 2 m→0 q 1 2 η μα η νβ + η μβ η να − 2 μν αβ η η 3 . 74) This is the famous van Dam-Veltman discontinuity [32, 33]. To understand how such discontinuity arises, let us consider the study made by Dicus et al. in Ref. . They have performed a full analysis on the graviton propagator both for the massive and the massless cases. First, consider an off-shell graviton particle.
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Beyond Standard Model Phenomenology at the LHC by Priscila de Aquino