-
Evidence for the associated production of a W boson and a top quark in ATLAS at sqrt(s) = 7 TeV
hep-ex
2012-05
accept
novelty 6.0 of 10
ATLAS observes 3.3-sigma evidence for Wt associated single-top production with a cross-section of 16.8 +/- 2.9 (stat) +/- 4.9 (syst) pb, consistent with the Standard Model and giving |Vtb| = 1.03 +0.16 -0.19.
-
Observation of spin correlation in ttbar events from pp collisions at sqrt(s) = 7 TeV using the ATLAS detector
hep-ex
2012-03
accept
novelty 6.0 of 10
Top and antitop quark spins in LHC proton-proton collisions are measured to be correlated at close to the Standard Model strength, and the hypothesis of zero spin correlation is excluded at 5.1 standard deviations.
-
Search for scalar bottom pair production with the ATLAS detector in pp collisions at sqrt(s) = 7 TeV
hep-ex
2011-12
accept
novelty 6.0 of 10
No excess of b-tagged dijet plus missing-momentum events was observed, excluding supersymmetric bottom squarks up to 390 GeV for neutralino masses below 60 GeV at 95% confidence.
-
Light Higgs boson discovery from fermion mixing
hep-ph
2006-03
conditional
novelty 6.0 of 10
If a 500 GeV vector-like quark T exists, its decays regenerate the ttH-like signature and allow a 5 sigma light-Higgs discovery with 8 fb^-1, versus 0.4 sigma at 30 fb^-1 in the Standard Model alone.
-
Search for lepton-flavour-violating decays of the Higgs and $Z$ bosons with the ATLAS detector
hep-ex
2016-04
accept
novelty 5.0 of 10
No lepton-flavour-violating Higgs or Z decays appear in 20.3 fb^-1 of 8 TeV ATLAS data, giving 95% CL limits Br(H to e tau) < 1.04%, Br(H to mu tau) < 1.43% and Br(Z to mu tau) < 1.69e-5.
-
Performance of $b$-Jet Identification in the ATLAS Experiment
hep-ex
2015-12
accept
novelty 5.0 of 10
ATLAS calibrates its b-jet, c-jet and light-flavour mistag efficiencies on 4.7 fb-1 of 7 TeV data with multiple independent methods and combines them into data-to-simulation scale factors consistent with unity.
-
Measurement of the differential cross-section of highly boosted top quarks as a function of their transverse momentum in $\sqrt{s}$ = 8 TeV proton-proton collisions using the ATLAS detector
hep-ex
2015-10
conditional
novelty 5.0 of 10
The differential ttbar cross-section as a function of hadronic top quark pT is measured from 300 to 1200 GeV with 13 to 29 percent total uncertainty, and most NLO and LO matrix-element generators agree within the corr...
-
Search for a high-mass Higgs boson decaying to a $W$ boson pair in $pp$ collisions at $\sqrt{s} = 8$ TeV with the ATLAS detector
hep-ex
2015-09
accept
novelty 5.0 of 10
No heavy Higgs boson appears in 8 TeV ATLAS data; for a narrow-width scalar at 1500 GeV the production cross section times WW branching ratio is bounded below 22 fb (gluon fusion) and 6.6 fb (vector-boson fusion) at 95% CL.
-
Search for lepton-flavour-violating $H\to\mu\tau$ decays of the Higgs boson with the ATLAS detector
hep-ex
2015-08
accept
novelty 5.0 of 10
ATLAS observes no significant H to mu tau signal in 20.3 inverse femtobarns of 8 TeV data and sets a 95% confidence-level upper limit of 1.85% on the branching fraction, against 1.24% expected.
-
Search for an additional, heavy Higgs boson in the $H\rightarrow ZZ$ decay channel at $\sqrt{s}$ = 8 TeV in $pp$ collision data with the ATLAS detector
hep-ex
2015-07
accept
novelty 5.0 of 10
No heavy Higgs boson signal appears in 20.3 fb^-1 of 8 TeV ATLAS data across four ZZ decay channels, yielding 95% CL cross-section limits from 0.53 pb at 195 GeV to 0.008 pb at 950 GeV and 2HDM exclusion contours.
-
A search for $t\bar{t}$ resonances using lepton-plus-jets events in proton-proton collisions at $\sqrt{s} = 8$ TeV with the ATLAS detector
hep-ex
2015-05
conditional
novelty 5.0 of 10
No top-pair resonance appears in 20.3 fb^-1 of ATLAS 8 TeV data, excluding a narrow leptophobic Z' below 1.8 TeV and a 15.3%-width Kaluza-Klein gluon below 2.2 TeV at 95% confidence.
-
Search for vector-like $B$ quarks in events with one isolated lepton, missing transverse momentum and jets at $\sqrt{s}=$ 8 TeV with the ATLAS detector
hep-ex
2015-03
accept
novelty 5.0 of 10
No excess over Standard Model backgrounds in 20.3 fb^-1 of 8 TeV ATLAS data yields 95% CL lower mass limits of 810 GeV for a chiral vector-like B quark, 640 GeV for an SU(2) singlet B, and 840 GeV for T5/3.
-
Constraints on the off-shell Higgs boson signal strength in the high-mass $ZZ$ and $WW$ final states with the ATLAS detector
hep-ex
2015-03
accept
novelty 5.0 of 10
Combining off-shell ZZ and WW events with on-shell Higgs measurements, ATLAS sets a 95% CL upper limit on the Higgs boson total width of 22.7 MeV (33.0 MeV expected).
-
Search for a CP-odd Higgs boson decaying to $Zh$ in $pp$ collisions at $\sqrt{s} = 8$ TeV with the ATLAS detector
hep-ex
2015-02
accept
novelty 5.0 of 10
No CP-odd Higgs boson A→Zh signal is observed in 20.3 fb⁻¹ of 8 TeV ATLAS data; 95% CL limits on σ(gg→A)×BR(A→Zh)×BR(h→ff) run from 0.098 to 0.013 pb for f=τ and 0.57 to 0.014 pb for f=b over mA = 220–1000 GeV.
-
Search for charged Higgs bosons decaying via $H^{\pm} \rightarrow \tau^{\pm}\nu$ in fully hadronic final states using $pp$ collision data at $\sqrt{s} = 8$ TeV with the ATLAS detector
hep-ex
2014-12
accept
novelty 5.0 of 10
No charged Higgs signal appears in 19.5 fb^-1 of 8 TeV ATLAS data; 95% CL upper limits on B(t to bH±) times B(H± to tau nu) fall between 0.23% and 1.3% for masses 80 to 160 GeV, and on the tH± production cross section...
-
Search for new phenomena in events with a photon and missing transverse momentum in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
hep-ex
2014-11
accept
novelty 5.0 of 10
No excess over Standard Model expectations in photon-plus-missing-momentum events at 8 TeV; the observed 95% CL upper limit on the fiducial cross section is 5.3 fb (6.1 fb expected), with new limits on dark matter, la...
-
Search for the $b\bar{b}$ decay of the Standard Model Higgs boson in associated $(W/Z)H$ production with the ATLAS detector
hep-ex
2014-09
accept
novelty 5.0 of 10
ATLAS finds a 1.4 sigma excess (2.6 sigma expected) in (W/Z)H with H to b-bbar, measuring a signal strength of 0.52 relative to the Standard Model, and validates the method on (W/Z)Z with Z to b-bbar at 0.74.
-
Search for neutral Higgs bosons of the minimal supersymmetric standard model in pp collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector
hep-ex
2014-09
accept
novelty 5.0 of 10
No excess of MSSM neutral Higgs bosons in the tau-tau final state is seen in about 20 fb^-1 of 8 TeV ATLAS data, and 95% CL limits exclude tan beta above 5.4 at mA = 140 GeV in the mmaxh scenario.
-
Search for pair and single production of new heavy quarks that decay to a $Z$ boson and a third-generation quark in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
hep-ex
2014-09
accept
novelty 5.0 of 10
No excess over the Standard Model is seen in Z plus third-generation-quark final states, giving 95% CL lower mass limits from 655 GeV (singlet T) to 755 GeV (doublet B) for vector-like quarks.
-
Search for new particles in events with one lepton and missing transverse momentum in $pp$ collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector
hep-ex
2014-07
accept
novelty 5.0 of 10
No excess appears in 8 TeV ATLAS data with one lepton and missing transverse momentum, excluding sequential-model W-prime bosons below 3.24 TeV and setting effective-field-theory dark matter limits.
-
Search for top squark pair production in final states with one isolated lepton, jets, and missing transverse momentum in $\sqrt{s}=$ 8 TeV pp collisions with the ATLAS detector
hep-ex
2014-07
accept
novelty 5.0 of 10
No significant excess is observed, and top squarks decaying to a top quark plus a massless neutralino are excluded between 210 and 640 GeV at 95% confidence level.
-
Jet energy measurement and its systematic uncertainty in proton-proton collisions at $\sqrt{s}=7$ TeV with the ATLAS detector
hep-ex
2014-05
accept
novelty 5.0 of 10
ATLAS calibrates its calorimeter jet energy scale in situ against photons, Z bosons and multijet balance, and reports a total systematic uncertainty below 1% for central jets with 55 < pT < 500 GeV.
-
Search for squarks and gluinos with the ATLAS detector in final states with jets and missing transverse momentum using $\sqrt{s}=8$ TeV proton--proton collision data
hep-ex
2014-05
accept
novelty 5.0 of 10
No significant excess of jets plus missing transverse momentum is observed in 20.3 fb^-1 of 8 TeV ATLAS data, excluding gluinos below 1330 GeV and squarks below 850 GeV in simplified supersymmetry models.
-
Search for direct production of charginos, neutralinos and sleptons in final states with two leptons and missing transverse momentum in pp collisions at sqrt(s) = 8 TeV with the ATLAS detector
hep-ex
2014-03
accept
novelty 5.0 of 10
No significant excess over Standard Model expectations is seen in two-lepton plus missing-momentum final states, yielding 95% CL lower mass limits of up to 465 GeV on charginos and 325 GeV on sleptons for a massless l...
-
Search for direct top-squark pair production in final states with two leptons in pp collisions at sqrt(s)=8TeV with the ATLAS detector
hep-ex
2014-03
accept
novelty 5.0 of 10
No excess over Standard Model expectations appears in any of 13 dilepton signal regions, so top squarks are excluded below 445 GeV (b plus chargino mode) and between 215 and 530 GeV (top plus neutralino mode) for a 1 ...
-
Measurement of the production of a W boson in association with a charm quark in pp collisions at sqrt(s)=7 TeV with the ATLAS detector
hep-ex
2014-02
accept
novelty 5.0 of 10
W+c cross sections from 4.6 fb^-1 of 7 TeV ATLAS data give a strange-to-down sea-quark ratio of 0.96 +0.26/-0.30 at Q^2 = 1.9 GeV^2, consistent with an SU(3)-symmetric light-quark sea.
-
Search for new phenomena in final states with large jet multiplicities and missing transverse momentum at sqrt(s)=8 TeV proton-proton collisions using the ATLAS experiment
hep-ex
2013-08
accept
novelty 5.0 of 10
No excess over Standard Model backgrounds is observed in high-jet-multiplicity events with missing transverse momentum, and pair-produced gluinos are excluded below about 1.1 TeV for light neutralinos.
-
Measurements of Higgs boson production and couplings in diboson final states with the ATLAS detector at the LHC
hep-ex
2013-07
accept
novelty 5.0 of 10
Combining three diboson decay channels on the full 7 and 8 TeV ATLAS dataset, the new boson's mass is 125.5 GeV, its overall production rate is 1.33 times the Standard Model expectation, and vector-boson fusion produc...
-
Performance of jet substructure techniques for large-R jets in proton-proton collisions at sqrt(s) = 7 TeV using the ATLAS detector
hep-ex
2013-06
accept
novelty 5.0 of 10
Trimming and mass-drop filtering, applied to large-R ATLAS jets, remove pile-up dependence from jet mass and sharpen boosted W, Z and top signals, with data-validated mass scales at the 4-5% level.
-
Measurement of the production cross section of jets in association with a Z boson in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
hep-ex
2013-04
accept
novelty 5.0 of 10
Z-plus-jets cross sections, differential in jet multiplicity, transverse momentum, rapidity and angular separations, agree broadly with NLO QCD and with ALPGEN and SHERPA, while MC@NLO badly underestimates multi-jet rates.
-
Search for a light charged Higgs boson in the decay channel H+->csbar in ttbar events using pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
hep-ex
2013-02
accept
novelty 5.0 of 10
No charged Higgs signal appears in the dijet mass spectrum of lepton-plus-jets top-quark events, giving 95% CL limits on B(t -> H+ b) between 1% and 5% for H+ masses of 90 to 150 GeV.
-
Search for resonances decaying into top-quark pairs using fully hadronic decays in pp collisions with ATLAS at sqrt(s) = 7 TeV
hep-ex
2012-11
conditional
novelty 5.0 of 10
No resonant top-pair excess appears in 4.7 fb^-1 of 7 TeV ATLAS data, excluding Kaluza-Klein gluons from 0.70 to 1.62 TeV and Z' bosons in two windows at 95% credibility.
-
Search for direct top squark pair production in final states with one isolated lepton, jets, and missing transverse momentum in sqrt(s) = 7 TeV pp collisions using 4.7 fb-1 of ATLAS data
hep-ex
2012-08
accept
novelty 5.0 of 10
No excess over Standard Model expectations appears in 4.7 fb-1 of 7 TeV ATLAS data, excluding direct top squark pair production for stop masses between 230 and 440 GeV when the invisible partner is massless.
-
Search for a supersymmetric partner to the top quark in final states with jets and missing transverse momentum at sqrt(s) = 7 TeV with the ATLAS detector
hep-ex
2012-08
accept
novelty 5.0 of 10
ATLAS finds no excess over Standard Model backgrounds in all-hadronic stop pair production and excludes stop masses between 370 and 465 GeV for a nearly massless neutralino.
-
Measurements of top quark pair relative differential cross-sections with ATLAS in pp collisions at sqrt(s) = 7 TeV
hep-ex
2012-07
conditional
novelty 5.0 of 10
Normalized differential top-antitop cross-sections in invariant mass, transverse momentum and rapidity, measured with 2.05 fb^-1 of 7 TeV ATLAS data, agree with NLO and NLO+NNLL Standard Model predictions within 10 to...
-
Measurement of the t-channel single top-quark production cross section in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
hep-ex
2012-05
accept
novelty 5.0 of 10
ATLAS measures the t-channel single top-quark cross section at 7 TeV to be 83 +/- 20 pb, consistent with the Standard Model, and extracts |Vtb| = 1.13 +0.14/-0.13.
-
Measurement of the W boson polarization in top quark decays with the ATLAS detector
hep-ex
2012-05
accept
novelty 5.0 of 10
The W boson helicity fractions in top quark decays are measured to be F0 = 0.67, FL = 0.32, and FR = 0.01, consistent with Standard Model predictions and used to constrain anomalous Wtb couplings.
-
Search for charged Higgs bosons decaying via H+ -> tau nu in top quark pair events using pp collision data at sqrt(s) = 7 TeV with the ATLAS detector
hep-ex
2012-04
conditional
novelty 5.0 of 10
No charged Higgs signal is seen in three top-pair final states, giving 95% CL upper limits on B(t -> bH+) of 5% at 90 GeV falling to 1% at 160 GeV, and excluding large regions of MSSM tan(beta).
-
Measurement of the top quark-pair production cross section with ATLAS in pp collisions at $\sqrt{s}=7\TeV$
hep-ex
2010-12
accept
novelty 5.0 of 10
ATLAS measures the top quark pair production cross-section in 7 TeV proton-proton collisions to be 145 ± 31 +42/-27 pb, consistent with the Standard Model prediction of about 165 pb.
-
THE TOOLS AND MONTE CARLO WORKING GROUP Summary Report from the Les Houches 2009 Workshop on TeV Colliders
hep-ph
2010-03
conditional
novelty 5.0 of 10
The Les Houches 2009 Tools and Monte Carlo group specifies updated event-file, flavour-observable and NLO runtime interfaces, and reports that the major LHC simulation chains agree in shape within roughly 20 to 50 percent.
-
Measurement of total and differential $W^+W^-$ production cross sections in proton-proton collisions at $\sqrt{s}=$ 8 TeV with the ATLAS detector and limits on anomalous triple-gauge-boson couplings
hep-ex
2016-03
accept
novelty 4.0 of 10
ATLAS measures the W+W- production cross section at 8 TeV to be 71.1 picobarns, about 1.4 standard deviations above the NNLO prediction, and sets limits on anomalous triple-gauge-boson couplings.
-
Search for charged Higgs bosons in the $H^{\pm} \rightarrow tb$ decay channel in $pp$ collisions at $\sqrt{s} = 8$ TeV using the ATLAS detector
hep-ex
2015-12
accept
novelty 4.0 of 10
No significant charged-Higgs signal in 20.3 fb^-1 of 8 TeV ATLAS data; upper limits are set on both associated and s-channel production, and MSSM mmod-h points with tan(beta) near 0.5 are excluded.
-
Measurement of the transverse momentum and $\phi^*_{\eta}$ distributions of Drell-Yan lepton pairs in proton-proton collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
hep-ex
2015-12
accept
novelty 4.0 of 10
ATLAS publishes corrected, combined electron- and muon-channel Drell-Yan transverse-momentum and phi*_eta distributions at 8 TeV, finding ResBos agrees at low phi*_eta but not at high values, and parton-shower generat...
-
Searches for Higgs boson pair production in the $hh\to bb\tau\tau, \gamma\gamma WW*, \gamma\gamma bb, bbbb$ channels with the ATLAS detector
hep-ex
2015-09
accept
novelty 4.0 of 10
Combining four ATLAS di-Higgs search channels in 8 TeV data yields a 95% CL upper limit of 0.69 pb on nonresonant hh production (70 times the Standard Model) and resonant limits from 2.1 pb at 260 GeV to 0.011 pb at 1000 GeV.
-
Searches for scalar leptoquarks in $pp$ collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector
hep-ex
2015-08
accept
novelty 4.0 of 10
No leptoquark signal appears in 20 fb^-1 of 8 TeV ATLAS data, so scalar leptoquarks are excluded below 1050 GeV (first generation), 1000 GeV (second generation), and roughly 625 to 640 GeV (third generation).
-
Search for production of $WW/WZ$ resonances decaying to a lepton, neutrino and jets in $pp$ collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector
hep-ex
2015-03
accept
novelty 4.0 of 10
No resonant WW or WZ production is seen in 20.3 fb^-1 of 8 TeV ATLAS data, excluding EGM W-prime bosons below 1490 GeV and bulk RS gravitons with k/MPl = 1 below 760 GeV at 95% confidence.
-
Search for squarks and gluinos in events with isolated leptons, jets and missing transverse momentum at $\sqrt{s}=8$ TeV with the ATLAS detector
hep-ex
2015-01
conditional
novelty 4.0 of 10
No excess over Standard Model expectations appears in 20 fb-1 of 8 TeV ATLAS data with a lepton, jets and missing energy, excluding gluinos up to 1.32 TeV and squarks up to 840 GeV in the models considered.
-
Search for strong production of supersymmetric particles in final states with missing transverse momentum and at least three b-jets at $\sqrt{s} =$ 8 TeV proton-proton collisions with the ATLAS detector
hep-ex
2014-07
accept
novelty 4.0 of 10
A null search in multi-bottom-jet plus missing-momentum final states excludes gluino masses up to about 1340 GeV in simplified supersymmetry models, extending earlier ATLAS limits.
-
Measurement of the $t\bar{t}$ production cross-section using $e\mu$ events with $b$-tagged jets in $pp$ collisions at $\sqrt{s}=7$ and 8 TeV with the ATLAS detector
hep-ex
2014-06
accept
novelty 4.0 of 10
ATLAS measures the top quark pair production cross-section to be 182.9 +/- 7.1 pb at 7 TeV and 242.9 +/- 8.8 pb at 8 TeV, consistent with next-to-next-to-leading-order QCD predictions.
-
Search for direct pair production of the top squark in all-hadronic final states in proton-proton collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
hep-ex
2014-06
accept
novelty 4.0 of 10
No excess over Standard Model backgrounds is observed in an all-hadronic top squark search, excluding top squark masses of 270 to 645 GeV for neutralino masses below 30 GeV at 95% confidence.
-
Search for the neutral Higgs bosons of the Minimal Supersymmetric Standard Model in pp collisions at sqrt(s)=7 TeV with the ATLAS detector
hep-ex
2012-11
accept
novelty 4.0 of 10
No significant excess appears in 4.7 to 4.8 inverse femtobarns of 7 TeV ATLAS data, and 95% confidence limits exclude MSSM neutral Higgs bosons with tan beta above about 9.3 at mA = 130 GeV.
-
Search for a heavy top-quark partner in final states with two leptons with the ATLAS detector at the LHC
hep-ex
2012-09
conditional
novelty 4.0 of 10
No excess over the Standard Model is seen in dilepton events, and a spin-1/2 top-quark partner of mass 300 to 480 GeV is excluded at 95% CL when its invisible partner is below 100 GeV.
-
Search for squarks and gluinos with the ATLAS detector in final states with jets and missing transverse momentum using 4.7 fb^-1 of sqrt(s) = 7 TeV proton-proton collision data
hep-ex
2012-08
accept
novelty 4.0 of 10
No excess over Standard Model backgrounds in jets-plus-missing-energy events, excluding gluino masses below 860 GeV and squark masses below 1320 GeV at 95% confidence in simplified SUSY models.
-
Measurement of the charge asymmetry in top quark pair production in pp collisions at sqrt(s) = 7 TeV using the ATLAS detector
hep-ex
2012-03
conditional
novelty 4.0 of 10
ATLAS measures the top-antitop charge asymmetry in 1.04 fb^-1 of 7 TeV pp collisions to be -0.019 +/- 0.028 (stat.) +/- 0.024 (syst.), consistent with the Standard Model prediction of 0.006 +/- 0.002.
-
Kaleu: a general-purpose parton-level phase space generator
hep-ph
2010-03
conditional
novelty 4.0 of 10
Kaleu packages the recursive phase space generator algorithm into a standalone Fortran library that plugs into HELAC/PHEGAS and ALPGEN and reproduces their published cross sections within statistical errors.