Search for direct production of electroweakinos in final states with one lepton, missing transverse momentum and a Higgs boson decaying into two b-jets in pp collisions at √s=13 TeV with the ATLAS detector

The results of a search for electroweakino pair production pp→χ~1±χ~20 in which the chargino (χ~1±) decays into a W boson and the lightest neutralino (χ~10), while the heavier neutralino (χ~20) decays into the Standard Model 125 GeV Higgs boson and a second χ~10 are presented. The signal selection r...

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Bibliographic Details
Authors: ATLAS Collaboration, Álvarez Piqueras, D., Aparisi Pozo, J.A., Cabrera, Susana, Castillo, F.L., Castillo Gimenez, M. V., Cerda Alberich, L., Costa, María José, Escobar, Carlos, Estrada, Oscar, Ferrer, Antonio, Fiorini, L., Fuster, Juan, Fullana, Esteban, García García, Carmen, García Navarro, José Enrique, González de la Hoz, Santiago, Higón, Emilio, Bailey, A.J., Lacasta Llácer, Carlos, Lozano Bahilo, José J., Madaffari, Daniele, Mamuzic, Judita, Martí García, Salvador, Melini, Davide, Mitsou, Vasiliki A., Moreno Llácer, María, Miñano Moya, M., Rodriguez Bosca, S., Ruiz-Martinez, A., Rodriguez Rodriguez, D., Salt, José, Santra, A, Soldevila, Urmila, Sánchez Martínez, Javier, Valero, Alberto, Valls Ferrer, Juan Antonio, Vos, M.
Format: article
Status:Published version
Publication Date:2020
Country:España
Institution:Consejo Superior de Investigaciones Científicas (CSIC)
Repository:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/230196
Online Access:http://hdl.handle.net/10261/230196
Access Level:Open access
Keyword:ddc:530
Description
Summary:The results of a search for electroweakino pair production pp→χ~1±χ~20 in which the chargino (χ~1±) decays into a W boson and the lightest neutralino (χ~10), while the heavier neutralino (χ~20) decays into the Standard Model 125 GeV Higgs boson and a second χ~10 are presented. The signal selection requires a pair of b-tagged jets consistent with those from a Higgs boson decay, and either an electron or a muon from the W boson decay, together with missing transverse momentum from the corresponding neutrino and the stable neutralinos. The analysis is based on data corresponding to 139 fb of s=13 TeV pp collisions provided by the Large Hadron Collider and recorded by the ATLAS detector. No statistically significant evidence of an excess of events above the Standard Model expectation is found. Limits are set on the direct production of the electroweakinos in simplified models, assuming pure wino cross-sections. Masses of χ~1±/χ~20 up to 740 GeV are excluded at 95% confidence level for a massless χ~10.