A search for evidence of invisible-particle decay modes of a Higgs boson produced in association with a Z boson at the Large Hadron Collider is presented No deviation from the standard model expectation is observed in 4 5 fb(-1) (20 3 fb(-1)) of 7 (8) TeV pp collision data collected by the ATLAS experiment Assuming the standard model rate for ZH production an upper limit of 75% at the 95% confidence level is set on the branching ratio to invisible-particle decay modes of the Higgs boson at a mass of 125 5 GeV The limit on the branching ratio is also interpreted in terms of an upper limit on the allowed dark matter-nucleon scattering cross section within a Higgs-portal dark matter scenario Within the constraints of such a scenario the results presented in this Letter provide the strongest available limits for low-mass dark matter candidates Limits are also set on an additional neutral Higgs boson in the mass range 110 < m(H) < 400 GeV produced in association with a Z boson and decaying to invisible particles ZB 0 Z8 0 ZR 0 ZS 0

Search for Invisible Decays of a Higgs Boson Produced in Association with a Z Boson in ATLAS

CAPUA, Marcella;Crosetti G.;LA ROTONDA, Laura;MASTROBERARDINO, Anna;Meoni E.;SCHIOPPA, Marco;TASSI, Enrico;
2014-01-01

Abstract

A search for evidence of invisible-particle decay modes of a Higgs boson produced in association with a Z boson at the Large Hadron Collider is presented No deviation from the standard model expectation is observed in 4 5 fb(-1) (20 3 fb(-1)) of 7 (8) TeV pp collision data collected by the ATLAS experiment Assuming the standard model rate for ZH production an upper limit of 75% at the 95% confidence level is set on the branching ratio to invisible-particle decay modes of the Higgs boson at a mass of 125 5 GeV The limit on the branching ratio is also interpreted in terms of an upper limit on the allowed dark matter-nucleon scattering cross section within a Higgs-portal dark matter scenario Within the constraints of such a scenario the results presented in this Letter provide the strongest available limits for low-mass dark matter candidates Limits are also set on an additional neutral Higgs boson in the mass range 110 < m(H) < 400 GeV produced in association with a Z boson and decaying to invisible particles ZB 0 Z8 0 ZR 0 ZS 0
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11770/141001
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 146
  • ???jsp.display-item.citation.isi??? 131
social impact