2019 Meeting of the Division of Particles & Fields of the American Physical Society

29 July 2019 to 2 August 2019
Northeastern University
US/Eastern timezone

Search for low-mass resonances decaying into two jets and produced in association with a photon using $pp$ collisions at $\sqrt{s}=$ 13 TeV with the ATLAS detector

29 Jul 2019, 16:34
17m
Shillman 335 (Northeastern University)

Shillman 335

Northeastern University

Oral Presentation Beyond Standard Model Physics

Speaker

Gang Zhang (Tsinghua University (CN))

Description

Many models predict new particles with sizeable couplings to quarks and gluons. A search is performed for localized excesses in dijet mass distributions of low-dijet-mass events produced in association with a high transverse energy photon. The search uses up to 79.8 fb$^{-1}$ of LHC proton–proton collisions collected by the ATLAS experiment at a center-of-mass energy of 13 TeV during 2015–2017. Two variants are presented: one that makes no jet flavour requirements and one that requires both jets to be tagged as b-jets. The observed mass distributions are consistent with multi-jet processes in the Standard Model. The data are used to set upper limits on the production cross-section for a benchmark Z’ model and, separately, on generic Gaussian-shape contributions to the mass distributions, extending the current ATLAS constraints on dijet resonances to the mass range between 225 and 1100 GeV.

Primary author

Gang Zhang (Tsinghua University (CN))

Co-author

ATLAS Collaboration