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Performance of b-jet identification in ATLAS
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
2014 (English)In: Nuovo cimento della societa italiana de fisica. C, Geophysics and space physics, ISSN 1124-1896, E-ISSN 1826-9885, Vol. 37, no 6, p. 123-128Article in journal (Refereed) Published
Abstract [en]

A performant identification of the jets originating from b-quarks is one of the key ingredients which allows for the diverse physics program of the ATLAS experiment. Algorithms for the b-jet identification in ATLAS are exploiting the long lifetime and the high mass of the b-hadrons, as well as the information on the tracks associated with jets. The performance of these algorithms is measured in data to enable reliable usage in the physics analyses. In this article, the performance of the multivariate technique MV1 for b-jet identification, which as its inputs takes information from the other b-jet identification algorithms in ATLAS, is presented. The efficiency of the MV1 algorithm is measured using dileptonic top pair events and is based on a likelihood approach. This approach allows to exploit per-event flavour and momentum correlations between the two jets. Correction factors which take into account differences in the b-jet identification efficiencies in simulation and data are derived as a function of jet transverse momentum and pseudo-rapidity. All the results are derived using the proton-proton collision dataset at centre of mass energy of √s = 8TeV corresponding to an integrated luminosity of L ≈ 20.3 fb-1.

Place, publisher, year, edition, pages
Editrice Compositori s.r.l. , 2014. Vol. 37, no 6, p. 123-128
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-177259DOI: 10.1393/ncc/i2015-11849-xScopus ID: 2-s2.0-84928994707OAI: oai:DiVA.org:kth-177259DiVA, id: diva2:872614
Note

QC 20151119

Available from: 2015-11-19 Created: 2015-11-17 Last updated: 2017-12-01Bibliographically approved

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