Search for long-lived exotic particles decaying to muon pairs : a study performed with 3 fb-1 data collected at the LHCb experiment in 2011 and 2012

Löbker, E.M. (2015) Search for long-lived exotic particles decaying to muon pairs : a study performed with 3 fb-1 data collected at the LHCb experiment in 2011 and 2012.

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Abstract:The Standard Model (SM) of particle physics has been very successful at predicting and explaining a wide range of experimental results and is the widely accepted theory of interactions and elementary particles [1,2]. However, some phenomena remain unexplained by it, like the inconsistencies between the gravitational e↵ects of astronomical objects and their mass from observable matter. This indicates the presence of ‘dark matter’ [3]. Gravity is not included in the SM and the dominance over matter over antimatter in the universe cannot be explained by it. Therefore, searches are performed for Beyond the Standard Model (BSM) physics, based on di↵erent theoretical models. Several of those predict the existence of massive long-lived particles that can decay to a muon pair [4–6], as illustrated in Figure 1. Because of the long lifetime, the muons originate from a displaced vertex, which provides a clear signature for a search. The SM background is easily suppressed here, which will become clear in this analysis.
Item Type:Essay (Master)
Faculty:TNW: Science and Technology
Subject:33 physics
Programme:Applied Physics MSc (60436)
Link to this item:http://purl.utwente.nl/essays/67102
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