Search for direct production of electroweakinos in final states with missing transverse momentum and a Higgs boson decaying into photons in pp collisions at sqrt(s) = 13 TeV with the ATLAS detector.

H. WAHLBERG Y ATLAS COLLABORATION

JOURNAL OF HIGH ENERGY PHYSICS - (Online)

SISSA

Lugar: Trieste; Año: 2020

1029-8479

A search for a chargino?neutralino pair decaying via the 125 GeV Higgs boson into photonsis presented. The study is based on the data collected between 2015 and 2018 with theATLAS detector at the LHC, corresponding to an integrated luminosity of 139 fb−1of ppcollisions at a centre-of-mass energy of 13 TeV. No significant excess over the expectedbackground is observed. Upper limits at 95% confidence level for a massless χ?01are set on several electroweakino production cross-sections and the visible cross-section for beyondthe Standard Model processes. In the context of simplified supersymmetric models, 95%confidence-level limits of up to 310 GeV in m(χ?±1/χ?02), where m(χ?01) = 0.5 GeV, are set. Limitsat 95% confidence level are also set on the χ?±1χ?02cross-section in the mass plane of m(χ?±1/χ?02) and m(χ?01), and on scenarios with gravitino as the lightest supersymmetric particle. Upper limits at the 95% confidence-level are set on the higgsino production cross-section. Higgsino masses below 380 GeV are excluded for the case of the higgsino fully decaying into a Higgs boson and a gravitino.