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Some Displays of Candidate Events Selected in Higgs Search Analyses

The event displays below are approved to be shown by ATLAS speakers at conferences and similar events. If you wish to use these event displays for other purposes than presentations of ATLAS results, please see the copyright statement.

NOTE that events on this page are selected in the ATLAS Higgs searches. These analyses select events which are almost all from known Standard Model backgrounds with no Higgs. Production of a Higgs can only be deduced by looking at the statistics of many events - no individual event can be reliably classed as a "Higgs event".

The main Event Display Public Page gives an overview on all available public event displays.


H → γγ

Event display of a candidate diphoton event where both photon candidates are unconverted. The event number is 86694500 and it was recorded during run 191426. The leading photon has ET=64.2 GeV and eta=-0.34. The subleading photon has ET=61.4 GeV and eta=-0.61. The measured diphoton mass is 126.6 GeV. The pT and pTt of the diphoton are 6.1 GeV and 5.4 GeV, respectively. Only reconstructed tracks with pT>1 GeV, hits in the pixel and SCT layers and TRT hits with a high threshold are shown (ATLAS-CONF-2011-161).

Event display of a candidate diphoton event where the leading (subleading) photon candidate is unconverted (converted). The event number is 19448322 and it was recorded during run 191190. The leading photon has ET=66.8 GeV and eta=-0.27. The subleading photon has ET=56.9 GeV and eta=-0.67. The measured diphoton mass is 125.8 GeV. The pT and pTt of the diphoton are 10.4 GeV and 3.1 GeV, respectively. The conversion radius of the subleading photon is measured to be 8.1 cm. Only reconstructed tracks with pT>1 GeV, hits in the pixel and SCT layers and TRT hits with a high threshold are shown (ATLAS-CONF-2011-161).

Close-up view in the transverse plane of the converted photon candidate shown in Figure 6 (run number = 191190, event number = 19448322). Only reconstructed tracks with pT > 2 GeV and |eta|<1.4 are shown, and only the hits in the pixel, SCT and TRT layers with -1<|eta|<0 are shown. Starting from the primary vertex (shown as a large magenta dot on the left), the photon conversion vertex (brown dot) can be seen at a radius of 8.1 cm, followed by the pixel hits (magenta dots), SCT clusters (green segments) and TRT hits (blue dots for normal dE/dx hits and red dots for hits above the high threshold required for transition radiation). The electron track (blue line) has pT=56.1 GeV and matches well with the electromagnetic cluster (shown in yellow at the outer radius). The positron track has pT=4.0 GeV and a fraction of its energy actually lies outside the main cluster. (ATLAS-CONF-2011-161).

Close-up view in the transverse plane of the longitudinal shower profile in the barrel electromagnetic calorimeter of the converted photon candidate shown in Figure 6 (run number = 191190, event number = 19448322). The layers of the EM calorimeter are shown as green boxes with sizes representing their real dimensions and with heights proportional to the energy deposited (normalised differently for each layer for viewing purposes). The two electrons from the photon conversions encounter first the presampler layer (which provides an estimate of the energy lost by bremsstrahlung in front of the active calorimeter), then the strip layer, which is fine-grained in eta and provides good gamma/pi0 rejection, and finally the second layer where most of the energy is deposited. The conversion is quite asymmetric and the showers initiated by the two electrons appear in different strip-layer modules (in phi) but line up very well with each other in eta, as expected for such an electron pair. (ATLAS-CONF-2011-161).

Event display of a diphoton event candidate where both photon candidates are unconverted. The event number is 56662314 and it was recorded during run 203779 at sqrt(s) = 8 TeV. The leading photon has eT = 62.2 GeV and eta = 0.39. The subleading photon has eT = 55.5 GeV and eta = 1.18. The measured diphoton mass is 126.9 GeV. The pT and pTt of the diphoton are 9.3 GeV and 6.5 GeV, respectively. Only reconstructed tracks with pT > 1 GeV, hits in the pixel and SCT layers and TRT hits with a high threshold are shown (ATLAS-CONF-2012-091).

Event display of a diphoton with a jet event candidate where both photon candidates are unconverted. The event number is 36443051 and it was recorded during run 203195 at sqrt(s) = 8 TeV. The leading photon has eT = 63.0 GeV and eta = 0.50. The subleading photon has eT = 56.1 GeV and eta = -0.96. The measured diphoton mass is 127.0 GeV. The pT and pTt of the diphoton are 83.9 GeV and 83.3 GeV, respectively. The jet has eT = 113 GeV and eta = -0.9. Only reconstructed tracks with pT > 1 GeV, hits in the pixel and SCT layers and TRT hits with a high threshold are shown (ATLAS-CONF-2012-091).

Event display of a diphoton with two jets event candidate where both photon candidates are converted. The event number is 24947130 and it was recorded during run 204769 at sqrt(s) = 8 TeV. The leading photon has eT = 80.1 GeV and eta = 1.01. The subleading photon has eT = 36.2 GeV and eta = -0.17. The measured diphoton mass is 126.9 GeV. The pT and pTt of the diphoton are 44.3 GeV and 6.2 GeV, respectively. The leading jet has eT = 120 GeV and eta = -2.9. The subleading jet has eT = 81 GeV and eta = 2.7. The measured two-jets mass is 1.6 TeV. The Delta phi between the diphoton system and the system of the two-jets is 2.9. Only reconstructed tracks with pT > 1 GeV, hits in the pixel and SCT layers and TRT hits with a high threshold are shown (ATLAS-CONF-2012-091).

H → ττ

Display of an event selected by the H -> tau_lep tau_had analysis in the H+2-jet VBF category, where the leptonic tau decay is to a muon (ATLAS-HIGG-2012-07).

Display of an event selected by the H -> tau_had tau_had analysis (ATLAS-HIGG-2012-07).

Display of an event selected by the H→ τ{lep}τ{lep} analysis in the VBF category, where one τ decays to an electron and the other to a muon. The electron is indicated by a green track and the muon indicated by a red track. The dashed line represents the direction of the ETmiss vector, and there are two VBF jets marked with turquoise cones. The muon pT is 20 GeV, the electron pT is 17 GeV, ETmiss=43 GeV, mjj=1610 GeV and mMMC=126 GeV (ATLAS-CONF-2012-160).

Display of an event selected by the H→ τ{lep}τ{had} analysis in the VBF category, where one τ decays to a muon. The hadronically decaying τ lepton (1 prong decay) is indicated by a green track and the muon is indicated by a red track. The dashed line represents the direction of the ETmiss vector, and there are two VBF jets marked with turquoise cones. The muon pT is 63 GeV, the τ{had} candidate pT is 96 GeV, ETmiss=119 GeV, mjj=625 GeV and mMMC=129 GeV (ATLAS-CONF-2012-160).

Display of an event selected by the H→ τ{had}τ{had} analysis in the VBF category. The τ{had} candidates are indicated by green tracks. The dashed line represents the direction of the ETmiss vector, and there are two VBF jets marked with turquoise cones. The transverse momenta of the τ{had} candidates are 56 GeV and 49 GeV, ETmiss=26 GeV, mjj=408 GeV and mMMC=131 GeV (ATLAS-CONF-2012-160).

H → ZZ → 4 leptons

H → ZZ → 4e

Event display of a 4e candidate. EventNumber: 82614360 RunNumber: 203602 m_4l=124.6 GeV. m_12=70.6 GeV, m_34=44.7 GeV. e_1: pt=24.9 GeV, eta=-0.33, phi=1.98. e_2: pt=53.9 GeV, eta=-0.40, phi=1.69. e_3: pt=61.9 GeV, eta=-0.12, phi=1.45. e_4: pt=17.8 GeV, eta=-0.51, phi=2.84 (ATLAS-CONF-2012-092, ATLAS-CONF-2012-169).

H → ZZ → 4μ

Event displays of a 4μ candidate event with m_4l=124.6 GeV. The masses of the lepton pairs are 89.7 GeV and 24.6 GeV (ATLAS-CONF-2011-162).

Event display of a 4mu candidate. EventNumber: 71902630 RunNumber: 204769 m_4l=125.1 GeV. m_12=86.3 GeV, m_34=31.6 GeV. mu_1: pt=36.1 GeV, eta=1.29, phi=1.33. mu_2: pt=47.5 GeV, eta=0.69, phi=-1.65. mu_3: pt=26.4 GeV, eta=0.47, phi=-2.51. mu_4: pt=7.17 GeV, eta=1.85, phi=1.65 (ATLAS-CONF-2012-092, ATLAS-CONF-2012-169).

Event display of a 4mu candidate. EventNumber: 82599793 RunNumber: 204769 m_4l=123.5 GeV. m_12=84 GeV, m_34=34.2 GeV. mu_1: pt=37.8 GeV, eta=0.61 phi=1.46. mu_2: pt=29.2 GeV, eta=-0.95, phi=-2.47. mu_3: pt=10.3 GeV, eta=0.62 phi=-1.41. mu_4: pt=32.6 GeV eta=-0.16, phi=2.85 (ATLAS-CONF-2012-092, ATLAS-CONF-2012-169).

Event display of a 4mu candidate. RunNumber: 209736, EventNumber: 135745044. m4l=122.9 GeV, m12=92.2 GeV, m34=20.8 GeV. mu1: pT,eta,phi=73.19 GeV, 2.08, 0.14 . mu2: pT,eta,phi=27.16 GeV, 1.55, -2.90 . mu3: pT,eta,phi=14.61 GeV, 1.79, -2.49 . mu4: pT,eta,phi=12.90 GeV, 2.12, -0.82 . pT4ell= 45.3 GeV. ETmiss=39.8 GeV (ATLAS-CONF-2012-169).

H → ZZ → 2e 2μ

Event displays of a 2e2μ candidate event with m_4l=124.3 GeV. The masses of the lepton pairs are 76.8 GeV and 45.7 GeV (ATLAS-CONF-2011-162).

Event displays of a 2μ2e candidate event with m_l=123.6 GeV. The masses of the lepton pairs are 89.3 GeV and 30.0 GeV (ATLAS-CONF-2011-162).

Event display of a 2e2mu candidate. EventNumber: 12611816 RunNumber: 205113 m_4l=123.9 GeV. m_12=87.9 GeV, m_34=19.6 GeV. e_1: pt=18.7 GeV, eta=-2.45, phi=1.68,. e_2: pt=75.96 GeV, eta=-1.16, phi=-2.13. mu_3: pt=19.6 GeV, eta=-1.14, phi=-0.87. mu_4: pt=7.9 GeV, eta=-1.13, phi=0.94 (ATLAS-CONF-2012-092, ATLAS-CONF-2012-169).

H → ZZ → ll qq

A candidate high-m(H) H -> ZZ -> mu mu bb event with m(mumubb) = 332 GeV. The event contains two muons with p_T > 20 GeV and two identified b-jets with p_T > 25 GeV (grey cones). The left hand side shows the transverse (top) and longitudinal (bottom) views, while the top right plot shows the calorimeter energy versus eta and phi (ATLAS-HIGG-2012-15).

A candidate high-m(H) H -> ZZ -> ee bb event with m(eebb) = 326 GeV. The event contains two electrons with p_T > 20 GeV and two identified b-jets with p_T > 25 GeV (grey cones). The left hand side shows the transverse (top) and longitudinal (bottom) views, while the top right plot shows the calorimeter energy versus eta and phi (ATLAS-HIGG-2012-15).

H → WW

H → WW → lν lν

Display of an event satisfying all the selection criteria for events in the 0-jet eμ channel. The reconstructed mT is 86 GeV (ATLAS-HIGG-2012-04).

Display of an event satisfying all the selection criteria for events in the H + 0 jet e+mu channel. The reconstructed lepton pT values are 33 and 29 GeV for the electron and the muon, respectively. The reconstructed METRel is 35 GeV and the mT is 94 GeV. (ATLAS-CONF-2012-098).

H → WW → lν jj

Event display of a $H\to WW\to\mu^+\nu jj+0j$ candidate with invariant mass 584~GeV. The $m_{jj}$ is 87~GeV and $m_T^{\mu\nu}$ is 47~GeV and $\met= 73$~GeV. The first jet has $\pt = 197$~GeV and $\eta = -1.13$. The second jet has $\pt = 59$~GeV and $\eta = -0.39$. The muon has $\pt = 160$~GeV and $\eta = 0.30$ (ATLAS-HIGG-2012-13).

Event display of a $H\to WW\to\mu^+\nu jj+1j$ candidate with invariant mass 388~GeV. The $m_{jj}$ is 79~GeV and $m_T^{\mu\nu}$ is 39~GeV and $\met= 128$~GeV. The first jet has $\pt = 88$~GeV and $\eta = 0.32$. The second jet has $\pt = 86$~GeV and $\eta = 1.03$. The third jet, which is \emph{not} matched to the hadronically decaying $W$, has $\pt = 45$~GeV and $\eta = -0.58$. The muon has $\pt = 49$~GeV and $\eta = -0.57$ (ATLAS-HIGG-2012-13).

H → ZH/WH

H → ZH → ll bb

ZH->llbb candidate event (ATLAS-HIGG-2012-08).

Display of a Higgs boson candidate event with two selected leptons. The two identified b-jets have transverse momenta of 70 GeV and 65 GeV, respectively, with an invariant mass of 122 GeV. The identified electrons have transverse momenta of 63 GeV and 54 GeV, respectively, resulting in a transverse momentum of the Z boson candidate of 115 GeV (ATLAS-CONF-2012-161).

H → WH → lν bb

WH->lvbb candidate event (ATLAS-HIGG-2012-08).

Display of a Higgs boson candidate event with one selected lepton. The two identified b-jets have transverse momenta of 149 GeV and 86 GeV, respectively, with an invariant mass of 109 GeV. The identified muon has a transverse momentum of 96 GeV, the missing energy in the transverse plane is 139 GeV, resulting in a transverse momentum of the W boson candidate of 209 GeV (ATLAS-CONF-2012-161).

H → ZH → νν bb

ZH->vvbb candidate event (ATLAS-HIGG-2012-08).

Display of a Higgs boson candidate event with zero selected leptons. The event contains two identified b-jets with transverse momenta of 193 GeV and 78 GeV, respectively, with an invariant mass of 123 GeV. The missing energy in the transverse plane is 271 GeV (ATLAS-CONF-2012-161).


Major updates:
-- MichaelHauschild - 13-Jul-2012

Responsible: DaveCharlton
Subject: public

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Topic revision: r15 - 2016-07-01 - DaveCharlton
 
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