Tracking of charged particles with nanosecond lifetimes at LHCb


Aaij, R ORCID: 0000-0003-0533-1952, Abdelmotteleb, ASW ORCID: 0000-0001-7905-0542, Beteta, C Abellan, Abudinén, F ORCID: 0000-0002-6737-3528, Ackernley, T ORCID: 0000-0002-5951-3498, Adams, JA ORCID: 0009-0003-9175-689X, Adefisoye, AA ORCID: 0000-0003-2448-1550, Adeva, B ORCID: 0000-0001-9756-3712, Adinolfi, M ORCID: 0000-0002-1326-1264, Adlarson, P ORCID: 0000-0001-6280-3851 et al (show 1072 more authors) (2024) Tracking of charged particles with nanosecond lifetimes at LHCb. The European Physical Journal C, 84 (7). 761-. ISSN 1434-6044, 1434-6052

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Abstract

<jats:title>Abstract</jats:title><jats:p>A method is presented to reconstruct charged particles with lifetimes between <jats:inline-formula><jats:alternatives><jats:tex-math>$$10\,\text {ps} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>10</mml:mn> <mml:mspace/> <mml:mtext>ps</mml:mtext> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> and <jats:inline-formula><jats:alternatives><jats:tex-math>$$10\,\text {ns},$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>10</mml:mn> <mml:mspace/> <mml:mtext>ns</mml:mtext> <mml:mo>,</mml:mo> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> which considers a combination of their decay products and the partial tracks created by the initial charged particle. Using the <jats:inline-formula><jats:alternatives><jats:tex-math>$${\varXi } ^- $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow> <mml:mi>Ξ</mml:mi> </mml:mrow> <mml:mo>-</mml:mo> </mml:msup> </mml:math></jats:alternatives></jats:inline-formula> baryon as a benchmark, the method is demonstrated with simulated events and proton-proton collision data at <jats:inline-formula><jats:alternatives><jats:tex-math>$$\sqrt{s} =13\,\text {TeV},$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>13</mml:mn> <mml:mspace/> <mml:mtext>TeV</mml:mtext> <mml:mo>,</mml:mo> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> corresponding to an integrated luminosity of 2.0<jats:inline-formula><jats:alternatives><jats:tex-math>$$\,\text {fb} ^{-1}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mspace/> <mml:msup> <mml:mtext>fb</mml:mtext> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> collected with the LHCb detector in 2018. Significant improvements in the angular resolution and the signal purity are obtained. The method is implemented as part of the LHCb Run 3 event trigger in a set of requirements to select detached hyperons. This is the first demonstration of the applicability of this approach at the LHC, and the first to show its scaling with instantaneous luminosity.</jats:p>

Item Type: Article
Uncontrolled Keywords: 5106 Nuclear and Plasma Physics, 5107 Particle and High Energy Physics, 51 Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 02 Sep 2024 07:33
Last Modified: 09 Dec 2024 20:39
DOI: 10.1140/epjc/s10052-024-12993-2
Open Access URL: https://link.springer.com/article/10.1140/epjc/s10...
Related Websites:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3184180
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