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Search for heavy charged long-lived particles in proton-proton collisions at $\sqrt{s} = 13$ TeV using an ionisation measurement with the \mbox{ATLAS} detector

2019-01-10Journal article Open access
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dc.contributor.authorATLAS collaboration (2933 authors)
dc.contributor.authorAguilar Saavedra, Juan Antonio
dc.contributor.authorAmor Dos Santos, Susana Patricia
dc.contributor.authorAraque Espinosa, Juan Pedro
dc.contributor.authorCastro, Nuno Filipe
dc.contributor.authorConde Muino, Patricia
dc.contributor.authorDa Cunha Sargedas De Sousa, Mario Jose
dc.contributor.authorDias DO Vale, Tiago
dc.contributor.authorFaisca Rodrigues Pereira, Rui Miguel
dc.contributor.authorFiolhais, Miguel
dc.contributor.authorGalhardo, Bruno
dc.contributor.authorGomes, Agostinho
dc.contributor.authorGoncalo, Ricardo
dc.contributor.authorJorge, Pedro
dc.contributor.authorMachado Miguens, Joana
dc.contributor.authorMaio, Amelia
dc.contributor.authorManeira, Jose
dc.contributor.authorMendes Gouveia, Emanuel Demetrio
dc.contributor.authorOleiro Seabra, Luis Filipe
dc.contributor.authorOnofre, Antonio
dc.contributor.authorCosta Batalha Pedro, Rute
dc.contributor.authorPereira Peixoto, Ana Paula
dc.contributor.authorSantos, Helena
dc.contributor.authorSaraiva, Joao
dc.contributor.authorSilva, Jose Manuel
dc.contributor.authorTavares Delgado, Ademar
dc.contributor.authorVeloso, Filipe
dc.contributor.authorWolters, Helmut
dc.date.accessioned2019-02-05T16:52:17Z
dc.date.available2019-02-05T16:52:17Z
dc.date.issued2019-01-10
dc.date.updated2019-02-05T16:52:17Z
dc.description.abstractThis Letter presents a search for heavy charged long-lived particles produced in proton–proton collisions at s=13TeV at the LHC using a data sample corresponding to an integrated luminosity of 36.1fb−1 collected by the ATLAS experiment in 2015 and 2016. These particles are expected to travel with a velocity significantly below the speed of light, and therefore have a specific ionisation higher than any high-momentum Standard Model particle of unit charge. The pixel subsystem of the ATLAS detector is used in this search to measure the ionisation energy loss of all reconstructed charged particles which traverse the pixel detector. Results are interpreted assuming the pair production of R -hadrons as composite colourless states of a long-lived gluino and Standard Model partons. No significant deviation from Standard Model background expectations is observed, and lifetime-dependent upper limits on R -hadron production cross-sections and gluino masses are set, assuming the gluino always decays to two quarks and a 100 GeV stable neutralino. R -hadrons with lifetimes above 1.0 ns are excluded at the 95% confidence level, with lower limits on the gluino mass ranging between 1290 GeV and 2060 GeV. In the case of stable R -hadrons, the lower limit on the gluino mass at the 95% confidence level is 1890 GeV.
dc.description.versionPeer Reviewed
dc.identifierPhys.Lett. B788 (2019) 96-116 Phys. Lett. B 788 (2019) 96; DOI 10.1016/j.physletb.2018.10.055
dc.identifier.urihttp://dx.doi.org/10.1016/j.physletb.2018.10.055
dc.identifier.urihttp://hdl.handle.net/10400.26/27710
dc.language.isoeng
dc.titleSearch for heavy charged long-lived particles in proton-proton collisions at $\sqrt{s} = 13$ TeV using an ionisation measurement with the \mbox{ATLAS} detector
dc.typejournal article
dspace.entity.typePublication
rcaap.rightsopenAccesspt
rcaap.typearticle

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