A search for a heavy, CP-odd Higgs boson, A, decaying into a Z boson and a 125 GeV Higgs boson, h, with the ATLAS detector at the LHC is presented. The search uses proton--proton collision data at a centre-of-mass energy of 8 TeV corresponding to an integrated luminosity of 20.3 fb-1. Decays of CP-even h bosons to tt or bb pairs with the Z boson decaying to electron or muon pairs are considered, as well as h?bb decays with the Z boson decaying to neutrinos. No evidence for the production of an A boson in these channels is found and the 95% confidence level upper limits derived for s(gg?A)×BR(A?Zh)×BR(h?ff¯) are 0.098--0.013 pb for f=t and 0.57--0.014 pb for f=b in a range of mA= 220--1000 GeV. The results are combined and interpreted in the context of two-Higgs doublet models.
Search for a CP-odd Higgs boson decaying to Zh in pp collisions at sqrt(s) = 8 TeV with the ATLAS detector
GORINI, Edoardo;PRIMAVERA, Margherita;SPAGNOLO, Stefania Antonia;VENTURA, Andrea
2015-01-01
Abstract
A search for a heavy, CP-odd Higgs boson, A, decaying into a Z boson and a 125 GeV Higgs boson, h, with the ATLAS detector at the LHC is presented. The search uses proton--proton collision data at a centre-of-mass energy of 8 TeV corresponding to an integrated luminosity of 20.3 fb-1. Decays of CP-even h bosons to tt or bb pairs with the Z boson decaying to electron or muon pairs are considered, as well as h?bb decays with the Z boson decaying to neutrinos. No evidence for the production of an A boson in these channels is found and the 95% confidence level upper limits derived for s(gg?A)×BR(A?Zh)×BR(h?ff¯) are 0.098--0.013 pb for f=t and 0.57--0.014 pb for f=b in a range of mA= 220--1000 GeV. The results are combined and interpreted in the context of two-Higgs doublet models.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
