Published September 5, 2025
| Version v1
Thesis
Open
On the measurement of the W → 3π decay with the Phase-2 L1 scouting system at CMS
Contributors
Supervisor (3):
- 1. European Organization for Nuclear Research
-
2.
University of Padua
- 3. National Institute for Nuclear Physics, Padova Division
Description
The era of exploring the subatomic world through particle accelerators has reached a new pinnacle with the Large Hadron Collider (LHC) at CERN. This groundbreaking facility has transformed our comprehension of the fundamental fabric of the universe by facilitating collisions between proton bunches (or heavy ions) at energies reaching up to 13.6 TeV. These high-energy collisions have led to momentous discoveries, notably the conőrmation of the Higgs boson’s existence. However, the quest for answers to still-unresolved questions in the field of particle physics is an ongoing evolution. In this context of unprecedented scientiőc excitement, the particle physics community is preparing for the next monumental phase: the upgrade to the LHC known as the High-Luminosity LHC (HL-LHC). The HL-LHC is designed to open new frontiers of exploration, enabling high-luminosity data acquisition and experiments with unprecedented precision. The Compact Muon Solenoid (CMS) at the Large Hadron Collider (LHC) stands as a remarkable testament to human ingenuity and collaborative scientific
endeavor. It is one of the main LHC detector and one of the two general-purpose experiment. CMS played a pivotal role in the discovery of the Standard Model (SM) Higgs boson, a goal envisioned since its design phase. It has a broad physics program ranging from the study of the SM to searching for novel interactions and particles beyond the Standard Model. This huge and incredibly sophisticated detector relies on a two-stage trigger system to select the most interesting collision events for read-out and analysis. The first of these, the level 1 (L1) trigger receives only a sub-set of the detector data at each bunch crossing (BX), and must determine whether to trigger the detector for the full readout within around 3 µs. The L1 data scouting (L1DS) system is a novel and innovative data collection approach that acquires intermediate data from the L1 trigger at the full bunch crossing rate of 40 MHz. This unique capability allows for analysis of event types
that occur too frequent to be part of the nominal L1 menu. Notably, the scouting system operates independently of the L1 trigger, ensuring that it does not inŕuence the trigger decision-making process. In order to determine the importance of a particular event, the L1 trigger rejects thousand of events. The scouting system assumes a pivotal role in avoiding the rejection of vast amounts of potentially valuable data containing interesting signatures.
endeavor. It is one of the main LHC detector and one of the two general-purpose experiment. CMS played a pivotal role in the discovery of the Standard Model (SM) Higgs boson, a goal envisioned since its design phase. It has a broad physics program ranging from the study of the SM to searching for novel interactions and particles beyond the Standard Model. This huge and incredibly sophisticated detector relies on a two-stage trigger system to select the most interesting collision events for read-out and analysis. The first of these, the level 1 (L1) trigger receives only a sub-set of the detector data at each bunch crossing (BX), and must determine whether to trigger the detector for the full readout within around 3 µs. The L1 data scouting (L1DS) system is a novel and innovative data collection approach that acquires intermediate data from the L1 trigger at the full bunch crossing rate of 40 MHz. This unique capability allows for analysis of event types
that occur too frequent to be part of the nominal L1 menu. Notably, the scouting system operates independently of the L1 trigger, ensuring that it does not inŕuence the trigger decision-making process. In order to determine the importance of a particular event, the L1 trigger rejects thousand of events. The scouting system assumes a pivotal role in avoiding the rejection of vast amounts of potentially valuable data containing interesting signatures.
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Pietro_Cappelli_Master_thesis.pdf
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Additional details
Related works
- Is variant form of
- Other: 2967684 (Inspire)
Dates
- Submitted
-
2023-12-06
CERN
- Department
- EP - Experimental Physics Department
- Programme
- CERN Short Term Internship Program
- Accelerator
- CERN HL-LHC
- Experiment
- CMS
- Projects
- HL_LHC
References
- Cappelli, P. (2023) On the measurement of the W → 3π decay with the Phase-2 L1 scouting system at CMS (University of Padova)