TY  - THES
AU  - Schlaffer, Matthias
TI  - Boosted Searches For New Physics At The LHC
IS  - DESY-THESIS-2015-036
SN  - 1435-8085
PB  - Universität Hamburg
VL  - Dissertation
CY  - Hamburg
M1  - PUBDB-2015-03458
M1  - DESY-THESIS-2015-036
T2  - DESY-THESIS
SP  - 121
PY  - 2015
N1  - Dissertation, Universität Hamburg, 2015
AB  - During the first run of the LHC, no apparent signs of new physics beyond the StandardModel were discovered, but rather the Standard Model-like properties of the Higgs particleconfirmed. Therefore, new and powerful methods are needed to disclose the traces of newphysics, which is expected to be at the TeV scale in order to solve the hierarchy problem.In this thesis, we propose two complementary strategies for the quest for new physics atthe LHC. First, we show how a very boosted Higgs in association with a hard jet can beused to determine the important top Yukawa coupling in gluon fusion. In the inclusive gluonfusion process this is not feasible since possible deviations from its Standard Model value arecombined and can even cancel with the effective Higgs-gluon interaction mediated by newtop partners. This cancellation is motivated within minimal composite Higgs models butalso in certain regions of the MSSM parameter space and can lead to a Standard Model-likeinclusive cross section that allows no conclusions on the mass spectrum of the new physics.We work out in detail how this degeneracy can be broken in the boosted Higgs channel andfind that even in the worst case scenario with a Standard Model-like inclusive cross section,the top Yukawa coupling can be constrained to 0.8–1.3 times its Standard Model value at95
LB  - PUB:(DE-HGF)3 ; PUB:(DE-HGF)11
DO  - DOI:10.3204/DESY-THESIS-2015-036
UR  - https://bib-pubdb1.desy.de/record/224253
ER  -