Show simple item record

dc.contributor.authorTumasyan, Armenpt_BR
dc.contributor.authorSilveira, Gustavo Gil dapt_BR
dc.contributor.authorBernardes, César Augustopt_BR
dc.contributor.authorCMS Collaborationpt_BR
dc.date.accessioned2022-07-23T05:05:43Zpt_BR
dc.date.issued2022pt_BR
dc.identifier.issn1029-8479pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/245504pt_BR
dc.description.abstractThe first collider search for dark matter arising from a strongly coupled hidden sector is presented and uses a data sample corresponding to 138 fb−1 , collected with the CMS detector at the CERN LHC, at √ s = 13 TeV. The hidden sector is hypothesized to couple to the standard model (SM) via a heavy leptophobic Z 0 mediator produced as a resonance in proton-proton collisions. The mediator decay results in two “semivisible” jets, containing both visible matter and invisible dark matter. The final state therefore includes moderate missing energy aligned with one of the jets, a signature ignored by most dark matter searches. No structure in the dijet transverse mass spectra compatible with the signal is observed. Assuming the Z 0 boson has a universal coupling of 0.25 to the SM quarks, an inclusive search, relevant to any model that exhibits this kinematic behavior, excludes mediator masses of 1.5–4.0 TeV at 95% confidence level, depending on the other signal model parameters. To enhance the sensitivity of the search for this particular class of hidden sector models, a boosted decision tree (BDT) is trained using jet substructure variables to distinguish between semivisible jets and SM jets from background processes. When the BDT is employed to identify each jet in the dijet system as semivisible, the mediator mass exclusion increases to 5.1 TeV, for wider ranges of the other signal model parameters. These limits exclude a wide range of strongly coupled hidden sector models for the first timeen
dc.format.mimetypeapplication/pdfpt_BR
dc.language.isoengpt_BR
dc.relation.ispartofThe journal of high energy physics. Trieste. No. 6 (June 2022), 156, 50 p.pt_BR
dc.rightsOpen Accessen
dc.subjectBeyond standard modelen
dc.subjectAceleradores de partículaspt_BR
dc.subjectDark matteren
dc.subjectColisões proton-protonpt_BR
dc.subjectMatéria escurapt_BR
dc.subjectHadron-hadron scatteringen
dc.titleSearch for resonant production of strongly coupled dark matter in proton-proton collisions at 13 TeVpt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb001145751pt_BR
dc.type.originEstrangeiropt_BR


Files in this item

Thumbnail
   

This item is licensed under a Creative Commons License

Show simple item record