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Properties of g -> b(b)over-bar at small opening angles in pp collisions with the ATLAS detector at root s=13 TeV
Facult ́e des Sciences, Universit ́e Mohamed Premier and LPTPM, Oujda, Morocco.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Högenergifysik.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Högenergifysik.ORCID-id: 0000-0002-1253-8583
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Högenergifysik.
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Rekke forfattare: 28982019 (engelsk)Inngår i: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 99, nr 5, artikkel-id 052004Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The fragmentation of high-energy gluons at small opening angles is largely unconstrained by present measurements. Gluon splitting to b-quark pairs is a unique probe into the properties of gluon fragmentation because identified b-tagged jets provide a proxy for the quark daughters of the initial gluon. In this study, key differential distributions related to the g -> b (b) over bar process are measured using 33 fb(-1) of root s = 13 TeV pp collision data recorded by the ATLAS experiment at the LHC in 2016. Jets constructed from charged-particle tracks, clustered with the anti-k(t) jet algorithm with radius parameter R = 0.2, are used to probe angular scales below the R = 0.4 jet radius. The observables are unfolded to particle level in order to facilitate direct comparisons with predictions from present and future simulations. Multiple significant differences are observed between the data and parton shower Monte Carlo predictions, providing input to improve these predictions of the main source of background events in analyses involving boosted Higgs bosons decaying into b-quarks.

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2019. Vol. 99, nr 5, artikkel-id 052004
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Identifikatorer
URN: urn:nbn:se:uu:diva-381082DOI: 10.1103/PhysRevD.99.052004ISI: 000461906000004OAI: oai:DiVA.org:uu-381082DiVA, id: diva2:1306320
Forskningsfinansiär
EU, European Research Council
Merknad

For complete list of authors see http://dx.doi.org/10.1103/PhysRevD.99.052004

Tilgjengelig fra: 2019-04-23 Laget: 2019-04-23 Sist oppdatert: 2019-04-23bibliografisk kontrollert

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Asimakopoulou, Eleni M.Bergeås Kuutmann, ElinBokan, PetarBrenner, RichardEkelöf, TordEllajosyula, VenugopalEllert, MattiasFerrari, ArnaudIsacson, Max F.Mårtensson, Mikael U.F.

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Asimakopoulou, Eleni M.Bergeås Kuutmann, ElinBokan, PetarBrenner, RichardEkelöf, TordEllajosyula, VenugopalEllert, MattiasFerrari, ArnaudIsacson, Max F.Mårtensson, Mikael U.F.
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