Search for low-mass resonances decaying into two jets and produced in association with a photon using pp collisions root s=13 TeV with the ATLAS detector

Abstract

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. ; ANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWFW, Austria; FWF, Austria; ANAS, Azerbaijan; SSTC, Belarus; CNPq, Brazil; FAPESP, Brazil; NSERC, Canada; CFI, Canada; CONICYT, Chile; NSFC, China; COLCIENCIAS, Colombia; MSMT CR, Czech Republic; MPO CR, Czech Republic; VSC CR, Czech Republic; DNRF, Denmark; DNSRC, Denmark; IN2P3-CNRS, France; BMBF, Germany; MPG, Germany; GSRT, Greece; RGC, Hong Kong SAR, China; ISF, Israel; Benoziyo Center, Israel; INFN, Italy; MEXT, Japan; JSPS, Japan; CNRST, Morocco; RCN, Norway; MNiSW, Poland; NCN, Poland; FCT, Portugal; MNE/IFA, Romania; NRC KI, Russian Federation; MESTD, Serbia; MSSR, Slovakia; ARRS, Slovenia; MIZS, Slovenia; MINECO, Spain; Wallenberg Foundation, Sweden; SNSF, Geneva, Switzerland; MOST, Taiwan; TAEK, Turkey; STFC, United Kingdom; DOE, United States of America; NSF, United States of America; BCKDF; FQRNT; Ontario Innovation Trust, Canada; ERC; ERDF; Horizon 2020 and Marie Sklodowska-Curie Actions, European Union; Investissements d'Avenir Labex; ANR, Region Auvergne; Fondation Partager le Savoir, France; DFG; AvH Foundation, Germany - EU-ESF; Greek NSRF; BSF, GIF; Minerva, Israel; BRF, Norway; CERCA Programme Generalitat de Catalunya; Generalitat Valenciana, Spain; Royal Society; Leverhulme Trust, United Kingdom; NRC, Canada; CERN; CAS, China; MOST, China; CEA-DRF/IRFU, France; SRNSFG, Georgia; HGF, Germany; NWO, Netherlands; MES of Russia; JINR; DST/NRF, South Africa; SRC, Sweden; SERI, Geneva, Switzerland; Cantons of Bern and Geneva, Switzerland; Canada Council; Canarie; CRC; Compute Canada; EPLANET ; Open access journal ; This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.