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ATLAS events
4 muon candidate Higgs event
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Candidate Higgs event with 4 muons
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4 electron candidate Higgs event
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4 electron candidate Higgs event
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4 electron candidate Higgs event
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4 electron candidate Higgs event
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4 electron candidate Higgs event
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4 electron candidate Higgs event
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Candidate Higgs event with 4 muons
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Candidate Higgs event with 2 muons & 2 electrons
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Candidate Higgs event with 2 muons & 2 electrons
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Candidate Higgs event with 2 muons & 2 electrons
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Mass distribution, presented July 4, 2012
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Event with 4 muons
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Event with 2 electrons & 2 muons
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Event with 2 energetic photons
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Event with 4 muons
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Candidate Higgs event with 2 electrons & 2 muons
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A di-photon event display...
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A high mass dijet event...
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Event with a high mass dijet system...
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Candidate W+Z double leptonic decay event
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Candidate event with a W decay, with a photon
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Candidate Z decays to leptons...
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A Multi-Jet Event from a 7 TeV Collision
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Z boson decaying to two electrons...
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Z boson decaying to two muons...
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W boson candidate...
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First W boson....
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Another display of an event...
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Display of a 7 TeV event....
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First 2.36 TeV Collision...
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First 2.36 TeV Collision...
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First 2.36 TeV Collision...
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First 900 GeV Collision...
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First 900 GeV Collision...
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First 900 GeV Collision...
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First 900 GeV Collision...
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First 900 GeV Collision...
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First 900 GeV Collision...
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First 900 GeV Collision...
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First 900 GeV Collision...
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First 900 GeV Collision...
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Display of a candidate collision...
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First 900 GeV Collision...
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3D display of 900 GeV event...
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First 900 GeV Candidate Collision Events, November 23rd, 2009

We recorded on Monday, November 23rd, the first few hundred candidate collision events. Below a picture of the first selected candidate event from the online event scanning.

Display of a candidate collision event showing tracks in the Inner Detector.

Photo #: atlas2009-collision-atlantis-140541-171897-new
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First 900 GeV Candidate Collision Events, November 23rd, 2009

We recorded on Monday, November 23rd, the first few hundred candidate collision events. Below a picture of the first selected candidate event from the online event scanning.

3D display of the previous candidate collision event.

Photo #: atlas2009-collision-vp1-140541-171897-new
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First 900 GeV Collision Events in Stable-Beam Conditions with Inner Detector Fully Powered, December 6, 2009

On Sunday morning, Dec 6, 2009, the LHC achieved for the first time 900 GeV collisions under stable-beam conditions. This allowed ATLAS to fully ramp the high voltage of the inner most pixel and silicon-strip tracking detectors. The following displays show events from run 141749 taken during this period.

Event display of a muon candidate, measured in the ATLAS muon spectrometer. Note that the toroidal magnetic field, bending the muon tracks in the z projection, is turned off for this run so that the muons follow a straight line path.

Photo #: atlas2009-collision-vp1-141749-171059-muon-web
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First 900 GeV Collision Events in Stable-Beam Conditions with Inner Detector Fully Powered, December 6, 2009

On Sunday morning, Dec 6, 2009, the LHC achieved for the first time 900 GeV collisions under stable-beam conditions. This allowed ATLAS to fully ramp the high voltage of the inner most pixel and silicon-strip tracking detectors. The following displays show events from run 141749 taken during this period.

Display of event showing the electromagnetic and hadronic calorimeters. Only hits on tracks are displayed here.

Photo #: atlas2009-collision-atlantis-141749-406601-web
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First 900 GeV Collision Events in Stable-Beam Conditions with Inner Detector Fully Powered, December 6, 2009

On Sunday morning, Dec 6, 2009, the LHC achieved for the first time 900 GeV collisions under stable-beam conditions. This allowed ATLAS to fully ramp the high voltage of the inner most pixel and silicon-strip tracking detectors. The following displays show events from run 141749 taken during this period.

Display of a collision event showing tracks in the Inner Detector system.

Photo #: atlas2009-collision-atlantis-141749-405315-hits-web
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First 2.36 TeV Collision Events recorded, December 8th, 2009

On Tuesday evening, December 8th, 2009, the LHC achieved for the first time 2.36 TeV collisions and ATLAS recorded their first events at this record energy.

Display of a 2-jet event recorded at 2.36 TeV. The jets have ET of 23.2 GeV and 16.2 GeV, their eta is 2.06 and 1.43, respectively.

Photo #: JiveXML_142065_116969-RZ-LegoPlot-YX-2009-12-08-22-52-41-web
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First 900 GeV Candidate Collision Events, November 23rd, 2009

We recorded on Monday, November 23rd, the first few hundred candidate collision events. Below a picture of the first selected candidate event from the online event scanning.

3D display of the same candidate collision event, showing the measured energies in the calorimeter.

Photo #: atlas2009-collision-vp1-140541-171897-new-lego
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First 900 GeV Candidate Collision Events, November 23rd, 2009

We recorded on Monday, November 23rd, the first few hundred candidate collision events. Below a picture of the first selected candidate event from the online event scanning.

Display of a another candidate collision event showing tracks in the Inner Detector.

Photo #: atlas2009-atlantis-140541-184417-web
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First 900 GeV Candidate Collision Events, November 23rd, 2009

We recorded on Monday, November 23rd, the first few hundred candidate collision events. Below a picture of the first selected candidate event from the online event scanning.

3D display of a candidate 2 jet event.

Photo #: atlas2009-vp1-140541-416712-2jet-web
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First 900 GeV Candidate Collision Events, November 23rd, 2009

We recorded on Monday, November 23rd, the first few hundred candidate collision events. Below a picture of the first selected candidate event from the online event scanning.

Display of the same candidate 2 jet event, showing the measured energies in the calorimeter.

Photo #: atlas2009-atlantis-140541-416712-2jet-web
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First 900 GeV Collision Events in Stable-Beam Conditions with Inner Detector Fully Powered, December 6, 2009

On Sunday morning, Dec 6, 2009, the LHC achieved for the first time 900 GeV collisions under stable-beam conditions. This allowed ATLAS to fully ramp the high voltage of the inner most pixel and silicon-strip tracking detectors. The following displays show events from run 141749 taken during this period.

Another display of the same 2 jet event showing different projections.

Photo #: JiveXML_141994_566308-RZ-LegoPlot-YX-2009-12-09-15-00-30-web
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First 900 GeV Collision Events in Stable-Beam Conditions with Inner Detector Fully Powered, December 6, 2009

On Sunday morning, Dec 6, 2009, the LHC achieved for the first time 900 GeV collisions under stable-beam conditions. This allowed ATLAS to fully ramp the high voltage of the inner most pixel and silicon-strip tracking detectors. The following displays show events from run 141749 taken during this period.

A display of a 2 jet event take a few days later with uncalibrated transverse energies of 54 GeV and 55 GeV, and pseudo-rapidities of -0.2 and -0.2, respectively.

Photo #: atlas2009-collision-vp1-141994-566308-2jet-web
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First 900 GeV Collision Events in Stable-Beam Conditions with Inner Detector Fully Powered, December 6, 2009

On Sunday morning, Dec 6, 2009, the LHC achieved for the first time 900 GeV collisions under stable-beam conditions. This allowed ATLAS to fully ramp the high voltage of the inner most pixel and silicon-strip tracking detectors. The following displays show events from run 141749 taken during this period.

A display of an event with 2 reconstructed muons in the forward region.

Photo #: atlas2009-collision-vp1-141749-133538-2muons-web
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First 900 GeV Collision Events in Stable-Beam Conditions with Inner Detector Fully Powered, December 6, 2009

On Sunday morning, Dec 6, 2009, the LHC achieved for the first time 900 GeV collisions under stable-beam conditions. This allowed ATLAS to fully ramp the high voltage of the inner most pixel and silicon-strip tracking detectors. The following displays show events from run 141749 taken during this period.

A display of a reconstructed secondary vertex from a Ks candidate decaying into 2 pions.

Photo #: atlas2009-collision-atlantis-141749-460665-kshort-cand-web
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First 2.36 TeV Collision Events recorded, December 14th, 2009

On Tuesday evening, December 8th, 2009, the LHC achieved for the first time 2.36 TeV collisions and ATLAS recorded their first events at this record energy. More events at this energy were taken on December 14th in the early morning.

Display of an event with jets, taken on December 14th at 2.36 TeV.

Photo #: atlas2009-collision-atlantis-142308-482137-web
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First 2.36 TeV Collision Events recorded, December 8th, 2009

On Tuesday evening, December 8th, 2009, the LHC achieved for the first time 2.36 TeV collisions and ATLAS recorded their first events at this record energy. More events at this energy were taken on December 14th in the early morning.

A view of an event taken on December 14th.

Photo #: atlas2009-collision-vp1-142308-482137-web
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On March 30, 2010, the LHC achieved 7 TeV collisions. Display of a jet event at 7 TeV recorded by ATLAS.

Photo #: JiveXML_152166_347262
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On March 30, 2010, the LHC achieved 7 TeV collisions. Display of a 7 TeV event... with to two inelastic proton-proton collisions (pile up).

Photo #: JiveXML_152166_467774-Pileup-improved
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On March 30, 2010, the LHC achieved 7 TeV collisions. Event display of a 7 TeV proton collision recorded by ATLAS.

Photo #: JiveXML_152166_316199-link
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On March 30, 2010, the LHC achieved 7 TeV collisions. Display of a 2 jet event at 7 TeV.

Photo #: atlas2010-vp1-152166-399473
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On March 30, 2010, the LHC achieved 7 TeV collisions. Another display of an event at 7 TeV with a muon candidate.

Photo #: atlas2010-vp1-152166-639756
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On March 30, 2010, the LHC achieved 7 TeV collisions. Display of an event at 7 TeV with Pixel detector fully on.

Photo #: JiveXML_152166_451982
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On March 30, 2010, the LHC achieved 7 TeV collisions. Display of an event at 7 TeV with a muon candidate.

Photo #: atlas2010-vp1-152166-322215
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On March 30, 2010, the LHC achieved 7 TeV collisions. Display of a 7 TeV proton collision event.

Photo #: atlas2010-vp1-152166-316199
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First candidate event for W boson to electron + neutrino seen in 7 TeV collision data.

Photo #: Atlantis-Wenu-lego-rz
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First W boson candidate event recorded by ATLAS in 2010.

Photo #: VP1-W-mune
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W boson candidate event recorded by ATLAS in 2010.

Photo #: VP1-W-munu-2
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W boson candidate event recorded by ATLAS in 2010.

Photo #: Atlantis-Wenu-lego-rz-2
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First candidate for an event with a Z boson decaying to two muons seen in 7 TeV collision data. 2010.

Photo #: atlas2010_vp1_run154822_evt14321500
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First candidate for an event with a Z boson decaying to two electrons seen in 7 TeV collision data. 2010.

Photo #: Atlantis_154817_968871-3d
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A Multi-Jet Event from a 7 TeV Collision

Photo #: JiveXML_158548_2486978
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Early heavy ion events in first heavy-ion fill with stable beam collisions seen in the ATLAS Experiment, 8 November 2010.

Photo #: 1011255_01
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Early heavy ion events in first heavy-ion fill with stable beam collisions seen in the ATLAS Experiment, 8 November 2010.

Photo #: 1011255_02
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Candidate event with a Z decay to muon pairs, recoiling against missing-ET. The muon candidates have transverse momenta of 50 and 126 GeV and a dimuon invariant mass of 94 GeV; the missing ET is measured to be 161 GeV.

Photo #: atlas2010_ZmumuMet-candidate_run167776_evt129360643
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An event with asymmetric jets.

Photo #: run169136_evt1395684_v5
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An event with asymmetric jets.

Photo #: run169045_evt1914004_v5
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An event with asymmetric jets.

Photo #: run169045_evt1914004_v5
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A highly asymmetric dijet event, with one jet with ET > 100 GeV and no evident recoiling jet, and with high energy calorimeter cell deposits distributed over a wide azimuthal region. Only tracks with pT > 2.6 GeV are shown, and only calorimeter energy deposits with cell energy ET > 700 MeV in the electromagnetic calorimeter, and E > 1 GeV in the hadronic calorimeter.

Photo #: HI-asyjet-paper
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Candidate W+Z double leptonic decay event. Candidate for a WZ ->eνμμ decay, collected on 7 October 2010. The invariant mass of the two muons is 96 GeV. The transverse mass of the potential W boson is 57 GeV.
Further event properties:
PT+) = 65 GeV
PT-) = 40 GeV
PT(e) = 64 GeV
ETmiss = 21 GeV

Photo #: WenuZmumu-candidate-VP1-r166466-e26227945
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Candidate for a W->μν decay, with the W boson produced in association with a photon, collected on 28 October 2010. The transverse mass of the W boson is 65 GeV. The muon and the photon are well isolated.
Further event properties: PT(mu) = 38 GeV
PT(gamma) = 39 GeV
ETmiss = 30 GeV

Photo #: Zeegamma-candidate-Atlantis-r167607-e28797604
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Candidate Z decays to leptons, produced in association with jets. Candidate for Z→μμ decay, with the Z produced in association with three jets, collected on 10 May 2010.
In the xy projection, the 144 GeV transverse momentum of the Z boson is especially apparent. The muon transverse momenta are 96 GeV and 68 GeV, and their invariant mass is 79 GeV. The harder muon has left a significant energy deposit (see lego-plot projection), presumably through bremsstrahlung; this is not included in the standard Z mass calculation. The jet transverse energies are 168, 105, and 45 GeV.

Photo #: Atlantis_158466_4174272_Zmumu3jets
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A high mass dijet event: two high-pT jets with invariant mass 2.8 TeV. A track pT cut of 2.5 GeV has been applied for the display.
  • 1st jet (ordered by pT): pT = 310 GeV, y = -2.0, φ = -0.2
  • 2nd jet: pT = 280 GeV, y = 2.5, φ = 2.9
  • 3rd jet: pT = 14 GeV, y = -0.9, φ = -1.0
Jet momenta are calibrated according to the "EM+JES" scheme. Event collected on 5 August 2010.

Photo #: JiveXML_160958_23181152-YX-RZ-LegoPlot-2010-08-18-09-42-44
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Event with a high mass dijet system: the invariant mass of the two highest-pT jets is 2.55 TeV. The highest pT jet has a pT of 420 GeV, and an eta of -1.51, the second leading jet has pT of 320 GeV and an eta of 2.32. Jet momenta are calibrated according to the "EM+JES" scheme. No other jets are found with pT above 20 GeV. Event collected on 4 July 2010.

Photo #: Atlantis-dijet-highpt-159224_3533152
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Di-photon event display with mγγ = 143.1 GeV, and an additional jet in the ECAL endcap (shown on the right).

Photo #: figaux_16
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ATLAS event containing four muons. This event is consistent with coming from two Z particles decaying: both Z particles decay to two muons each. Such events are produced by Standard Model processes without Higgs particles. They are also a possible signature for Higgs particle production, but many events must be analysed together in order to tell if there is a Higgs signal. This view is a zoom into the central part of the detector. The four muons are picked out as red tracks. Other tracks and deposits of energy in the calorimeters are shown in yellow.

Photo #: 1112301_01
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ATLAS event containing two electrons and two muons. This event is consistent with coming from two Z particles decaying: one Z decays to two muons, the other to two electrons. Such events are produced by Standard Model processes without Higgs particles. They are also a possible signature for Higgs particle production, but many events must be analysed together in order to tell if there is a Higgs signal. The two muons are picked out as red tracks penetrating right through the detector. The two electrons are picked out as green tracks in the central, inner detector, matching narrow green clusters of energy in the barrel part of the calorimeters. The inset at the bottom right shows a map of the energy seen in the detector: the two big yellow spikes correspond to the two electrons.

Photo #: 1112300_01
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An event where two energetic photons ("gammas") are produced in a proton-proton collision in ATLAS. Many events of this type are produced by well-understood Standard Model processes ("backgrounds") which do not involve Higgs particles. A small excess of events of this type with similar masses could indicate evidence for Higgs particle production, but any specific event is most likely to be from the background. The photons are indicated, in the different projections and views, by the clusters of energy shown in yellow.

Photo #: 1112299_01
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An ATLAS event with 4 muons. The four muons are picked out as long blue tracks.

Photo #: FourMuon
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An ATLAS event with 2 muons and 2 electrons. The two muons are picked out as long blue tracks, the two electrons as short blue tracks matching green clusters of energy in the calorimeters which lie outside the inner tracking detector.

Photo #: TwoElectronTwoMuon
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An ATLAS event with 2 photons. The photons are indicated by the clusters of energy shown in green.

Photo #: TwoPhoton
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Event display of a H -> 4e candidate event with m(4l) = 124.5 (124.6) GeV without (with) Z mass constraint. The masses of the lepton pairs are 70.6 GeV and 44.7 GeV. The event was recorded by ATLAS on 18-May-2012, 20:28:11 CEST in run number 203602 as event number 82614360. The tracks and clusters of the two electron pairs are colored red and blue, respectively.

Photo #: run203602_evt82614360_VP1DetailFull
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Event display of a H -> 4e candidate event with m(4l) = 124.5 (124.6) GeV without (with) Z mass constraint. The masses of the lepton pairs are 70.6 GeV and 44.7 GeV. The event was recorded by ATLAS on 18-May-2012, 20:28:11 CEST in run number 203602 as event number 82614360. The tracks and clusters of the two electron pairs are colored red and blue, respectively.

Photo #: run203602_evt82614360_hres
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Hi resolution
Event display of a H -> 4e candidate event with m(4l) = 124.5 (124.6) GeV without (with) Z mass constraint. The masses of the lepton pairs are 70.6 GeV and 44.7 GeV. The event was recorded by ATLAS on 18-May-2012, 20:28:11 CEST in run number 203602 as event number 82614360. The tracks and clusters of the two electron pairs are colored red and blue, respectively. The three displays on the right-hand side show the r-phi view of the event (top), a zoom into the vertex region, indicating that the 4 electrons originate from the same primary vertex (middle), and a Lego plot indicating the amount of transverse energy Et measured in the calorimeters (bottom).

Photo #: run203602_evt82614360_VP1Base
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Hi resolution
Event display of a H -> 4mu candidate event with m(4l) = 124.1 (125.1) GeV without (with) Z mass constraint. The masses of the lepton pairs are 86.3 GeV and 31.6 GeV. The event was recorded by ATLAS on 10-Jun-2012, 13:24:31 CEST in run number 204769 as event number 71902630. Zoom into the tracking detector. Muon tracks are colored red.

Photo #: run204769_evt71902630
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Event display of a H -> 4mu candidate event with m(4l) = 124.1 (125.1) GeV without (with) Z mass constraint. The masses of the lepton pairs are 86.3 GeV and 31.6 GeV. The event was recorded by ATLAS on 10-Jun-2012, 13:24:31 CEST in run number 204769 as event number 71902630. Muon tracks are colored red.

Photo #: run204769_evt71902630_MSonly_hres
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Hi resolution
Event display of a H -> 4e candidate event with m(4l) = 124.5 (124.6) GeV without (with) Z mass constraint. The masses of the lepton pairs are 70.6 GeV and 44.7 GeV. The event was recorded by ATLAS on 18-May-2012, 20:28:11 CEST in run number 203602 as event number 82614360. Zoom into the tracking detector and the LAr calorimeter where its detailed structure is highlighted. The tracks and clusters of the two electron pairs are colored red and blue, respectively.

Photo #: run203602_evt82614360_ID_LAr_hres
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Hi resolution
Event display of a H -> 4e candidate event with m(4l) = 124.5 (124.6) GeV without (with) Z mass constraint. The masses of the lepton pairs are 70.6 GeV and 44.7 GeV. The event was recorded by ATLAS on 18-May-2012, 20:28:11 CEST in run number 203602 as event number 82614360. The tracks of the two electron pairs are colored red, the clusters in the LAr calorimeter are colored darkgreen.

Photo #: run203602_evt82614360_ID_LAR_Atlantis_hres
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Hi resolution
Event display of a H -> 4mu candidate event with m(4l) = 124.1 (125.1) GeV without (with) Z mass constraint. The masses of the lepton pairs are 86.3 GeV and 31.6 GeV. The event was recorded by ATLAS on 10-Jun-2012, 13:24:31 CEST in run number 204769 as event number 71902630. Muon tracks are colored red. The inset on the right-hand side shows a zoom into the tracking detector. The inset on top shows a zoom into the vertex region, indicating that the 4 muons originate from the same primary vertex.

Photo #: run204769_evt71902630_VP1Base
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Hi resolution
Event display of a H -> 2e2mu candidate event with m(4l) = 122.6 (123.9) GeV without (with) Z mass constraint. The masses of the lepton pairs are 87.9 GeV and 19.6 GeV. The event was recorded by ATLAS on 18-Jun-2012, 11:07:47 CEST in run number 205113 as event number 12611816. Zoom into the tracking detector. Muon tracks are colored red, electron tracks and clusters in the LAr calorimeter are colored green.

Photo #: run205113_evt12611816_DetailID
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Hi resolution
Event display of a H -> 2e2mu candidate event with m(4l) = 122.6 (123.9) GeV without (with) Z mass constraint. The masses of the lepton pairs are 87.9 GeV and 19.6 GeV. The event was recorded by ATLAS on 18-Jun-2012, 11:07:47 CEST in run number 205113 as event number 12611816. Muon tracks are colored red, electron tracks and clusters in the LAr calorimeter are colored green. The Lego plot inset indicates the amount of transverse energy Et measured in the calorimeters. The second inset shows a zoom into the vertex region, indicating that the 4 leptons originate from the same primary vertex.

Photo #: run205113_evt12611816_VP1Base
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Hi resolution
Event display of a H -> 2e2mu candidate event with m(4l) = 122.6 (123.9) GeV without (with) Z mass constraint. The masses of the lepton pairs are 87.9 GeV and 19.6 GeV. The event was recorded by ATLAS on 18-Jun-2012, 11:07:47 CEST in run number 205113 as event number 12611816. Muon tracks are colored red, electron tracks and clusters in the LAr calorimeter are colored green. The Lego plot inset indicates the amount of transverse energy Et measured in the calorimeters. The second inset shows a zoom into the vertex region, indicating that the 4 leptons originate from the same primary vertex.

Photo #: run205113_evt12611816_VP1Base_lego
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Hi resolution
Event display of a H -> 4e candidate event with m(4l) = 124.5 (124.6) GeV without (with) Z mass constraint. The masses of the lepton pairs are 70.6 GeV and 44.7 GeV. The event was recorded by ATLAS on 18-May-2012, 20:28:11 CEST in run number 203602 as event number 82614360. Zoom into the tracking detector. The tracks and clusters of the two electron pairs are colored red and blue, respectively.

Photo #: run203602_evt82614360_VP1DetailID_2
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On 4 July, 2012, the ATLAS experiment presented a preview of its updated results on the search for the Higgs Boson. The results were shown at a seminar held jointly at CERN and later via video link at ICHEP, the International Conference for High Energy Physics in Melbourne, Australia.

Photo #: MassDistributionfourleptonchannel