Measurement of top quark pair differential cross section at the CMS experiment and Randall-Sundrum black hole search at LHC
- Resource Type
- Dissertation/ Thesis
- Authors
- 고정환 / Junghwan Goh
- Source
- Subject
- Top quark
cross section
CMS
Randall-Sundrum model
black hole
LHC
- Language
- English
The differential cross-section of top quark pair production is measured at $\sqrt{s} = 7 \TeV$using the CMS experiment data of $5 \invfb$.We selected $\ttbar$ events in the dilepton channel with high purity.Kinematic reconstruction technique is applied to recover missing neutrino momentum information.Reconstructed $\ttbar$ mass distribution is unfolded to correct distortion from detector resolution.The measured distribution of top quark pair production cross-section shows a good agreementwith the theoretical predictions within estimated uncertainties.Many existing problems in the Standard Model is expected to be solved by introducing redundantextra spatial dimensions in the universe. One of efficient probe for the extra dimension is search forthe microscopic Blackholes produced during particle collisions. We studied production and decay ofmicroscopic Blackholes, focusing on Randall-Sundrum model type I. From our study, Blackhole inRS model is expected to decay mostly to many top and bottom quarks, which is unique signaturein the collider experiment. We calculated production cross section of RS Blackhole at the LHC andstudied feasibility to discover Blackhole.