Configuration and performance of the ATLAS b-jet triggers in Run 2 [Elektronisk resurs]
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Aad, G. (författare)
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Asimakopoulou, Eleni M. (författare)
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Bergeås Kuutmann, Elin, 1980- (författare)
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Bokan, Petar (författare)
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Brenner, Richard (författare)
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Ekelöf, Tord (författare)
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Ellajosyula, Venugopal (författare)
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Ellert, Mattias (författare)
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Ferrari, Arnaud, 1973- (författare)
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Gonzalez Suarez, Rebeca (författare)
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Isacson, Max F. (författare)
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Mårtensson, Mikael U. F. (författare)
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Mathisen, Thomas (författare)
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Zwalinski, L. (författare)
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Uppsala universitet Teknisk-naturvetenskapliga vetenskapsområdet (utgivare)
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Uppsala universitet Teknisk-naturvetenskapliga vetenskapsområdet (utgivare)
- Publicerad: SPRINGER, 2021
- Engelska.
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Ingår i: European Physical Journal C. - 1434-6044. ; 81:12
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Sammanfattning
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- Several improvements to the ATLAS triggers used to identify jets containing b-hadrons (b-jets) were implemented for data-taking during Run 2 of the Large Hadron Collider from 2016 to 2018. These changes include reconfiguring the b-jet trigger software to improve primary-vertex finding and allow more stable running in conditions with high pile-up, and the implementation of the functionality needed to run sophisticated taggers used by the offline reconstruction in an online environment. These improvements yielded an order of magnitude better light-flavour jet rejection for the same b-jet identification efficiency compared to the performance in Run 1 (2011-2012). The efficiency to identify b-jets in the trigger, and the conditional efficiency for b-jets that satisfy offline b-tagging requirements to pass the trigger are also measured. Correction factors are derived to calibrate the b-tagging efficiency in simulation to match that observed in data. The associated systematic uncertainties are substantially smaller than in previous measurements. In addition, b-jet triggers were operated for the first time during heavy-ion data-taking, using dedicated triggers that were developed to identify semileptonic b-hadron decays by selecting events with geometrically overlapping muons and jets.
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- Natural Sciences (hsv)
- Physical Sciences (hsv)
- Subatomic Physics (hsv)
- Naturvetenskap (hsv)
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- government publication (marcgt)
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European Physical Journal C