2024-03-29T14:06:25Z
https://tsukuba.repo.nii.ac.jp/oai
oai:tsukuba.repo.nii.ac.jp:00051937
2022-07-18T23:51:51Z
117:5005
117:5006
117:789
117:790
3:62:5598:84
Properties of g→b ̄b at small opening angles in pp collisions with the ATLAS detector at √s=13??TeV
原, 和彦
ハラ, カズヒコ
HARA, Kazuhiko
大川, 英希
オオカワ, ヒデキ
OKAWA, Hideki
佐藤, 構二
サトウ, コウジ
SATO, Koji
受川, 史彦
ウケガワ, フミヒコ
UKEGAWA, Fumihiko
ATLA Collaboration
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 process are measured using 33??fb?1 of √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-kt 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.
journal article
American Physical Society
2019-03
application/pdf
Physical review D
5
99
052004
2470-0010
AA00773624
https://tsukuba.repo.nii.ac.jp/record/51937/files/PRD_99-5-052004.pdf
eng
https://doi.org/10.1103/PhysRevD.99.052004
c 2019 CERN, for the ATLAS Collaboration
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
open access