Status of Standard Model Higgs searches in ATLAS
ATLAS Higgs searches, F. Gianotti, HEPAP meeting, 27/8/2012. 1. Status of ... 2009 : 23 November: first LHC collisions (√s = 900 GeV). 2010 : 30 ... Excellent ATLAS detector performance in terms of data-taking efficiency and data quality ... (note: large and sometimes not well-known backgrounds estimated mostly with.
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First observations of a new particle in the search - Elsevier Webshop
Results of the ATLAS Standard Model Higgs boson searches. ... The probability that the data are due to background for mH ∼126 GeV is 1.7 × 10−9, corresponding to a ... Introduction .... sections for the t¯tH process are estimated up to NLO QCD [47–51]. ..... ggF process is rescaled to take into account the expected destruc-.
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ATLAS Experiment Overview and Higgs Searches
Nov 8, 2012 ... 1. Introduction. One of the primary goals for the first phase of the LHC physics ... The performance of ATLAS  in the initial 2012 data-taking up to mid-June is briefly re- .... that a background-only experiment would fluctuate to produce a ..... The estimate of the ZZ(∗) continuum background was taken from ...
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Dec 15, 2015 ... The data are consistent with the expected background in most of the mass range. ... 1 Introduction ... This note reports an analysis optimized to search for Higgs- like ... The ATLAS detector  at the LHC is a multi-purpose particle .... production associated to the gg → γγ process is estimated to be tiny and is ...
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Status of Standard Model Higgs searches in ATLAS - CMS DocDB
1. Fabiola Gianotti (CERN), representing the. ATLAS Collaboration ... We present updated results on SM Higgs searches based on the data ... results are presented here for the first time ... Data-taking efficiency = (recorded lumi)/( delivered lumi): .... (note: large and sometimes not well-known backgrounds estimated mostly ...
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Results of Beyond-the-Standard Model 2HDM Higgs Searches
summaries from two of the most recent 2HDM searches in ATLAS. 1. Introduction. The Standard Model (SM) is the centrepiece describing the ..... The first of these is that the tau lepton with highest ... All backgrounds caused by mis-identified jets are estimated via a data-driven template method .... taking period at ATLAS.
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Search for the Standard Model Higgs in H → ZZ → 4l channel with
the selection steps and the background control from data. ... Introduction ... The search for the Standard Model (SM) Higgs boson is one of the major goals ... In July 2012, the CMS and ATLAS experiments announced the discovery .... The expected number of Z+X background events in the signal region is obtained by taking.
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Search for lepton-flavour-violating decays of the Higgs and $ Z
Apr 27, 2016 ... 1 Introduction ... Higgs doublet [1–4], composite Higgs models [5, 6], models with flavour ... study constitutes the first ATLAS search for LFV decays of the Z boson with .... taking the deposited energy in clusters of calorimeter cells as inputs. ... In the τlep channel, all backgrounds are estimated from data.
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Higgs boson discovery and recent results - arXiv.org
Oct 7, 2015 ... 1 Introduction. In July 2012, the ATLAS  and CMS  collaborations announced the discovery [3, ... Most of the results are based on the full data set recorded in 2011 and 2012 ... Before the first LHC results, the Higgs boson mass had been ... The LHC searches thus focused on the region above 114 GeV.
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Nov 15, 2012 ... 1 Introduction ... new physics results shortly after the start of data taking. .... Table 1: Channels used in the search for the Higgs boson and the ... Similarly ATLAS observe 185 events, estimate a background of ..... The Standard Model has passed the first scrutiny by LHC, which probed for the first time the TeV.
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a search for non-standard model higgs bosons produced - inSPIRE
This is the first resonance search in this final state at ... the heart of the background estimation step and makes the entire analysis possible. Tim Barklow has ... Abstract iv. Acknowledgements v. 1 Theory of Higgs Physics. 1. 1.1 Introduction . ..... 3.6 An event from early ATLAS data-taking, with a number of tracks. (teal, in the ...
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Search for a SM Higgs boson in the H → Z\*Z → ℓ+ℓ−qq̅ channel in
range 120 - 180 GeV with the ATLAS Detector at ps = 7 TeV. Giovanni ... A summary of the first study is given for the decay channel H ! Z⇤Z ! `+` q¯q (` = e,µ) in ... Data driven methods to estimate the background and new techniques to improve ... 1 Introduction. The search for the Higgs boson is one of the major bench-.
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Limits on the production of the Standard Model Higgs Boson in pp
Jul 16, 2011 ... 1 Introduction. The search for the Standard Model Higgs boson [1–3] is one of the ... First results from the ATLAS ex- periment ... proton collision data collected in 2010 at a centre-of-mass .... The Higgs boson decay branching ratios used take into .... cesses, and estimated background composition for a total.
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Properties of the Higgs Boson Discovered at the Large Hadron
Aug 13, 2015 ... In their search for the Standard Model (SM) Higgs boson, the ATLAS and ... approximately 125 GeV during the first Large Hadron Collider run. ... INTRODUCTION . .... to 6.7 fb−1 of data recorded by the CDF and D0 experiments (14) and .... signal selection efficiencies while suppressing the backgrounds in ...
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Beyond Standard Model Higgs boson physics with the ATLAS
Aug 12, 2014 ... Standard Model Higgs boson searches using Run I LHC ... 1 Introduction ... The first measurements indicate that the new particle is indeed ...  using 20.3 fb−1 of 8 TeV proton-proton collision data. .... The γγ mass range of this search is constrained by trigger and background estimation requirements from.
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Search for an additional, heavy Higgs boson in the H → ZZ decay
s = 8 TeV in pp collision data with the ATLAS ... 1 Introduction . .... −1 of data collected at. √ s = 7 TeV [5–7]. A heavy Higgs boson with the width and ... selection and background estimation for the four searches are ... levels; the first ( L1) is a hardware-based system, while the .... The q ¯q → Zh samples take into account NLO.
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A search for dark matter through invisible decays of the Higgs boson
Jan 1, 2013 ... the Higgs boson with the ATLAS detector at the. LHC ... 4.6 fb-1 of data collected in 2011. A search for the Higgs in the WW decay ... First Advisor ... I was fortunate to be introduced to particle physics by such a great .... 6.5 Data taking conditions . ..... 8.4 Top background estimates from the simulation and two ...
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Higgs Boson: Theory and Searches - Particle Data Group
1–. HIGGS BOSONS: THEORY AND SEARCHES. Updated May 2012 by G. Bernardi (CNRS/IN2P3, LPNHE/U. ... I. Introduction. II. .... background estimation in the mass range 115 GeV < mH < ... At present both LHC experiments, ATLAS and CMS, have ... 1 , taking ..... The first LHC exclusion of Higgs boson masses.
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Search for the standard model Higgs boson in the H to ZZ to ll tau
Feb 17, 2012 ... 1. 1 Introduction. The search for the standard model (SM) [1–3] Higgs ... This is the first Higgs boson search performed in the H → ZZ → l+l− ... 13 GeV (pT > 17 GeV for the end of the data-taking period when the instantaneous luminosity .... Table 1: The estimated yields of ZZ and other background events ...
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Search for an Invisibly Decaying Higgs Boson Produced via - Sissa
Sep 17, 2015 ... 1 Introduction. 2. 2 Higgs ... 6.3.1 Data-drive Estimation of the Multijet Background . ..... For each source of uncertainty, where relevant, the first and second .... all the searches for invisible decays of the Higgs boson at ATLAS in Chapter 7. ..... taking and for the LHC future will be discussed in Chapter 8.
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