Results of the search for an A boson decaying to Zh, with an ??ττ final state, in pp collisions at 8 TeV centre of mass energy recorded with the ATLAS experiment

High Energy Particle Physics Workshop 2015

Hamity, Guillermo Nicolas^1

School of Physics, University of the Witwatersrand, Johannesburg

2050, South Africa^1

关键词: ATLAS experiment;    Background estimation;    Center-of-mass energies;    Centre-of-mass energies;    Proton proton collisions;    Reduction techniques;    Systematic uncertainties;    The standard model;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/645/1/012011/pdf
DOI  :  10.1088/1742-6596/645/1/012011

来源: IOP

【 摘 要 】

The neutral CP-dd boson A is predicted by many models with an extended Higgs sector. Searching for the A boson in the sensitive Zh decay, where h is assumed to be the LHC discovered Higgs boson, within the mass range of 220 - 1000 GeV, offers a gateway to find physics beyond the Standard Model. A search for a gluon-fusion-produced A in the decay to Zh, with a final state of two light leptons and two tau leptons, is conducted with 20.3 fb-1of proton- proton collision data at 8 TeV center of mass energy. The data driven background estimations, background reduction techniques and systematic uncertainty calculations are presented. Upper limits on the cross section times branching ratio of the A boson decaying to ττ are set for various 2-Higgs-Doublet-Model (2HDM) scenarios. Where no excess is observed, exclusion limits are set on ranges of the 2HDM phase-space.