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Time-based vertex reconstruction in the Compact Muon Solenoid

Bartlett, Benjamin C. and Gray, Lindsey and Bornheim, Adolf and Spiropulu, María (2015) Time-based vertex reconstruction in the Compact Muon Solenoid. . (Unpublished)

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The Phase-II upgrades to the Large Hadron Collider will introduce a variety of new measurement devices to the CMS, including the High-Granularity Calorimeter (HGCAL). The increase in luminosity from these upgrades will also have the undesired side effect of vastly increasing pileup to a level at which the current machine learning vertex reconstruction (vertexing) algorithms cease to be effective. This will necessitate the development of further vertexing algorithms. Using high precision timing measurements from simulated events in the HGCAL, we design a vertex reconstruction algorithm that requires only the spatiotemporal arrival coordinates to reconstruct the interaction vertex of a collision with sub-millimeter resolution. We also analyse how particle energy and simulated time smearing affect this resolution and we apply this algorithm to more realistic H->γγ sets. To do this, we implement a set of filters to remove poorly-reconstructed events and introduce a new algorithm capable of reconstructing interaction vertices given the pointing data and arrival data of a single cluster. Progress on this work was ultimately hindered by extensive errors in the clustering algorithms used the generation of the datasets; should these errors be resolved, further work would include integration with tracker information and the application of these algorithms to high-pileup scenarios and QCD jets.

Item Type:Report or Paper (Technical Report)
Bartlett, Benjamin C.0000-0002-1799-799X
Bornheim, Adolf0000-0002-0128-0871
Spiropulu, María0000-0001-8172-7081
Additional Information:We would like to thank the family of Jean J. Dixon for their support of the Caltech SURF program, as this project has been in part made possible by their generous funding. We are also indebted to the Caltech CMS group for a number of illuminating conversations over the course of our group meetings. Finally, we would like to thank the Swiss Heatwave 2015, whose 40°C temperatures kept us in our office, expediting the results of this study.
Funding AgencyGrant Number
family of Jean J. DixonUNSPECIFIED
Caltech Summer Undergraduate Research Fellowship (SURF)UNSPECIFIED
Subject Keywords:vertex reconstruction; pileup; timing; HGCAL; CMS; LHC; CERN
Record Number:CaltechAUTHORS:20160403-191607457
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:65867
Deposited By: Benjamin Bartlett
Deposited On:04 Apr 2016 22:55
Last Modified:09 Mar 2020 13:18

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