#StudentSeminar: A GPU based full software trigger for LHCb and tracking algorithms for long-lived particles in Real-Time

by Brij Kishor JASHAL (IFIC)

Thursday 20 Apr 2023, 15:00 → 16:30 Europe/Madrid

1001-Primera-1-1-1 - Paterna. Seminario (Universe)

The physics opportunities offered by the next generation of Large Hadron Collider based experiments come with challenges. The High luminosity due to the large number of proton-proton collisions means having to deal with higher pile-up and high data-rates.
To cope with these conditions, the LHCb experiment has developed sophisticated two stage trigger systems to select interesting events for analysis. For LHCb Run3 and beyond, The first stage, High Level Trigger 1, has been implemented on GPUs capable of reducing the visible collision rate from 30 MHz to 1 MHz. These triggers are designed to identify events that may be of scientific interest and to discard events that are not relevant.

One such interesting avenue in particle physics is the study of Long-lived particles (LLPs) of the Standard Model(SM) as well as beyond the standard model (BSM). Many interesting decay modes involve strange particles with large lifetimes such as Ks or L0s. Exotic LLP are also predicted in many new theoretical models. The selection and reconstruction of LLPs produced is a challenge. These particles can decay far from the primary interaction vertex and are hard to select by the trigger systems of the experiments and difficult to isolate from the SM backgrounds.

In this seminar, LHCb’s new online computing infrastructure and trigger system will be introduced. Some of the key reconstruction and selection algorithms which have been developed for highly parallel computing architectures for GPU based HLT1 will be presented. How these algorithms will be instrumental in the studies and searches of LLPs from SM and BSM new physics will be discussed.

Seminar_UV_Brij_Jashal.pdf