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Project: B1

Title:          Analysis of four-top-quark production with ATLAS data
DESY group:     ATLAS

Type:           Online project

Duration:       19th july - 10th sep 2021

Description: 
The data collected at the Large Hadron collider enables tests of the Standard Model with unprecedented precision 
and searches for new particles, such as candidates for dark matter or heavy resonances, even in rare and complex 
final states. The top quark is the heaviest particle known to date and is among the most central objects 
to collider physics today: top quarks are omnipresent in collider searches both as background and as signal. 
The top quark Yukawa coupling being close to unity makes top quarks the most interesting objects in many scenarios 
for physics beyond the Standard model and provides an excellent opportunity for understanding the nature of 
electroweak symmetry breaking. Recently, the ATLAS experiment has published the first evidence for the production 
of four top quarks. Searches in the four top quark final state have significant discovery potential 
for new particles which interact strongly to the top sector, such as resonances predicted in Randall-Sundrum models 
with warped extra dimensions. The student will analyse four top quark signal models and develop 
new reconstruction algorithms to improve the signal acceptance. Background processes which can mimic 
a four-top signal and need to be estimated using widely employed techniques. 
Hence, the student will gain a broad experience in the methods used in LHC searches and the underlying physics.


Special Qualifications expected:
Existing knowledge of Linux/UNIX, Shell, python and C++ is highly preferable.


Link to further information: 
https://atlas.cern/updates/briefing/evidence-four-top-quark-production
http://me.pgadow.de
https://www.desy.de/about_desy/lead_scientists/krisztian_peters/index_eng.html
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