Search for low-mass resonances decaying into two jets and produced in association with a photon using pp collisions at TeV with the ATLAS detector

R. PIEGAIA; ATLAS COLLABORATION; ATLAS COLLABORATION; R. PIEGAIA

PHYSICS LETTERS B

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2019

0370-2693

A search is performed for localised 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 centre-of-mass energy of 13 TeV during 2015?2017. Two variants are presented: one which makes no jet flavour requirements and one which 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 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.