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Status of Standard Model Higgs searches in ATLAS
Fabiola Gianotti (CERN), representing the ATLAS Collaboration

Using the full datasets recorded in 2011 at √s= 7 TeV and 2012 at √s=8 TeV: up to 10.7 fb-1
Fabiola Gianotti (CERN), representing the ATLAS Collaboration

ATLAS: Status of SM Higgs searches, 4/7/2012

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Blick am Abend

Tuesday, 19 June 2012

“This is how the Higgs boson could look”
ATLAS: Status of SM Higgs searches, 4/7/2012 2

We present updated results on SM Higgs searches based on the data recorded in 2011 at √s=7 TeV (~4.9 fb-1) and 2012 at √s=8 TeV (~5.9 fb-1) Results are preliminary:  2012 data recorded until 2 weeks ago  harsher conditions in 2012 due to ~ x2 larger event pile-up  new, improved analyses deployed for the first time H  γγ and H 4l: high-sensitivity at low-mH; high mass-resolution; pile-up robust  analyses improved to increase sensitivity  new results from 2011 data  all the data recorded so far in 2012 have been analyzed  results are presented here for the first time Other low-mass channels: H WW(*) lνlν, H ττ, W/ZH W/Z bb:  ETmiss in final state  less robust to pile-up  worse mass resolution, no signal “peak” in some cases  complex mixture of backgrounds  understanding of the detector performance and backgrounds in 2012 well advanced, but results not yet mature enough to be presented today  2011 results used here for these channels for the overall combination
ATLAS: Status of SM Higgs searches, 4/7/2012

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2012 data-taking so far …

Peak luminosity in 2012: ~ 6.8 x1033 cm-2 s-1

Fraction of non-operational detector channels:
(depends on the sub-detector)

few permil (most cases) to 4% ~ 94.6%

Data-taking efficiency = (recorded lumi)/(delivered lumi): Good-quality data fraction, used for analysis :
ATLAS: Status of SM Higgs searches, 4/7/2012

(will increase further with data reprocessing)

~ 93.6%

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2012 data-taking so far …

Peak luminosity in 2012: ~ 6.8 x1033