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Nuclear and Particle Physics

Hardware tracking for ATLAS at the HL-LHC and a search for third generation scalar leptoquarks with the ATLAS detector

by Mikael Mårtensson (Uppsala University)

13167 (Ångstrom)



(Pre-defence seminar) The High Luminosity upgrade of the Large Hadron Collider at CERN will increase the instantaneous luminosity delivered to the ATLAS detector with a factor of 5 to 7. To benefit from this, the trigger rates have to be kept at manageable levels while maintaining or lowering the trigger pT-thresholds. The Hardware Tracking for the Trigger (HTT) system is a key component to make this happen. The HTT is based on custom-made Associative Memory (AM) Application-Specific Integrated Circuits (ASICs). However, since the development of custom ASICs is inherently risky, alternative methods for hardware tracking have to be investigated. This talk describes such a method based on the Hough transform with the potential to be implemented in commercially available Field Programmable Gate Arrays (FPGAs). The second part of the talk describes a search for pair-produced third generation scalar leptoquarks, each decaying into a b-quark and a tau-lepton, using 36.1 fb^-1 of data collected by ATLAS at a center-of-mass energy of 13 TeV. Leptoquarks are well motivated by a variety of beyond the standard model theories as well as recent tensions with respect to the standard model observed in B-mesons decaying to D-mesons by BaBar, LHCb, and Belle.
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