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	Author	Kholoimov, V.; Jashal, B.K.; Oyanguren, A.; Svintozelskyi, V.; Zhuo, J.
	Title	A Downstream and Vertexing Algorithm for Long Lived Particles (LLP) Selection at the First High Level Trigger (HLT1) of LHCb			Type	Journal Article
	Year	2025	Publication	Computing and Software for Big Science	Abbreviated Journal	Comput. Softw. Big Sci.
	Volume	9	Issue		Pages	10 - 12pp
	Keywords
	Abstract	A new algorithm has been developed at LHCb which is able to reconstruct and select very displaced vertices in real-time at the first level of the trigger (HLT1). It makes use of the Upstream Tracker (UT) and the Scintillator Fiber detector (SciFi) of LHCb and it is executed on GPUs inside the Allen framework. In addition to an optimized strategy, it utilizes a Neural Network (NN) implementation to increase the track efficiency and reduce the ghost rates, with very high throughput and limited time budget. Besides serving to reconstruct K0s and Λ particles from the Standard Model, the Downstream algorithm and the associated two-track vertexing could largely increase the LHCb physics potential for detecting long-lived particles during the Run 3.
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	Corporate Author				Thesis
	Publisher		Place of Publication		Editor
	Language		Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN	2510-2044	ISBN		Medium
	Area		Expedition		Conference
	Notes				Approved	no
	Is ISI	yes	International Collaboration	yes
	Call Number	IFIC @ pastor @			Serial	7195
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