7 documents found, page 1 of 1
Measurement of the c-jet mistagging efficiency in tt¯ events using pp collision...
Castro, N. F.; Fiolhais, M. C. N.; Gonçalo, J. R.; Onofre, A.; Veloso, F.; Wolters, H.; Atlas CollaborationA technique is presented to measure the efficiency with which c-jets are mistagged as b-jets (mistagging efficiency) using t ¯t events, where one of theW bosons decays into an electron or muon and a neutrino and the other decays into a quark–antiquark pair. The measurement utilises the relatively large and known W → cs branching ratio, which allows ameasurement to be made in an inclusive c-jet sample. The data ...
Performance of the ATLAS Level-1 topological trigger in Run 2
Fiolhais, M. C. N.; Gonçalo, J. R.; Onofre, A.; Veloso, F.; Wolters, H.; Atlas Collaboration
Search for exotic decays of the Higgs boson into $b\bar{b}$ and missing transve...
Fiolhais, M. C. N.; Gonçalo, J. R.; Wolters, H.; Veloso, F.; ATLAS CollaborationComments: 38 pages in total, author list starting on page 22, 4 figures, 2 tables, published in JHEP. All figures, including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HDBS-2018-07/; A search for the exotic decay of the Higgs boson ($H$) into a $b\bar{b}$ resonance plus missing transverse momentum is described. The search is performed with the ATLAS detector at the L...
Search for new phenomena with top quark pairs in final states with one lepton, ...
Fiolhais, M. C. N.; Gonçalo, J. R.; Veloso, F.; Wolters, H.; ATLAS CollaborationA search for new phenomena with top quark pairs in final states with one isolated electron or muon, multiple jets, and large missing transverse momentum is performed. Signal regions are designed to search for two-, three-, and four-body decays of the directly pair-produced supersymmetric partner of the top quark (stop). Additional signal regions are designed specifically to search for spin-0 mediators that are ...
Measurement of the nuclear modification factor for muons from charm and bottom ...
Fiolhais, M. C. N.; Gonçalo, J. R.; Veloso, F.; Wolters, H.; ATLAS Collaboration38 pages in total, author list starting page 22, 7 figures, 1 tables, published by Phys. Lett. B. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2019-58; Heavy-flavour hadron production provides information about the transport properties and microscopic structure of the quark-gluon plasma created in ultra-relativistic heavy-ion collisions. A me...
Search for associated production of a $Z$ boson with an invisibly decaying Higg...
Fiolhais, M. C. N.; Gonçalo, J. R.; Veloso, F.; Wolters, H.; ATLAS Collaboration43 pages in total, author list starting page 27, 8 figures, 2 tables, published in PLB. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2018-26/; A search for invisible decays of the Higgs boson as well as searches for dark matter candidates, produced together with a leptonically decaying $Z$ boson, are presented. The analysis is performed usin...
Effect of the drift field on avalanche gain and charge collection in microgap d...
Fraga, F. A. F.; Marques, R. Ferreira; Gonçalves, J. A. C.; Gonçalo, J. R.; Policarpo, A. J. P. L; Eijk, C. W. E. van; Hollander, R. W.One of the main drawbacks of the use of microgap structures when used at high pressure (6 bar) at high count rates (~106 s-1 mm-2) is the limited maximum safe gain at which they can be operated. The use of a preamplification device such as the GEM (gas electron multiplier) can overcome this limitation; however, secondary space charge effects due to charge accumulation at the non-metallic surfaces cannot be negl...