Publicação

Search for dark matter in events with a Z boson and missing transverse momentum in pp collisions at s√=8 TeV with the ATLAS detector

Detalhes bibliográficos
Resumo:	A search is presented for production of dark-matter particles recoiling against a leptonically decaying Z boson in 20.3 fb-1 of pp collisions at s=8 TeV with the ATLAS detector at the Large Hadron Collider. Events with large missing transverse momentum and two oppositely charged electrons or muons consistent with the decay of a Z boson are analyzed. No excess above the Standard Model prediction is observed. Limits are set on the mass scale of the contact interaction as a function of the dark-matter particle mass using an effective field theory description of the interaction of dark matter with quarks or with Z bosons. Limits are also set on the coupling and mediator mass of a model in which the interaction is mediated by a scalar particle.
Autores principais:	Onofre, A.
Outros Autores:	Castro, Nuno Filipe Silva Fernandes; ATLAS Collaboration
Ano:	2014
País:	Portugal
Tipo de documento:	artigo
Tipo de acesso:	acesso aberto
Instituição associada:	Universidade do Minho
Idioma:	inglês
Origem:	RepositóriUM - Universidade do Minho

Descrição
Resumo:	A search is presented for production of dark-matter particles recoiling against a leptonically decaying Z boson in 20.3 fb-1 of pp collisions at s=8 TeV with the ATLAS detector at the Large Hadron Collider. Events with large missing transverse momentum and two oppositely charged electrons or muons consistent with the decay of a Z boson are analyzed. No excess above the Standard Model prediction is observed. Limits are set on the mass scale of the contact interaction as a function of the dark-matter particle mass using an effective field theory description of the interaction of dark matter with quarks or with Z bosons. Limits are also set on the coupling and mediator mass of a model in which the interaction is mediated by a scalar particle.