Search results for: S. Bedikian

Items from 1 to 20 out of 254 results

article

Addendum to ‘Measurement of the $$t\bar{t}$$ t t ¯ production cross-section using $$e\mu $$ e μ events with b-tagged jets in pp collisions at $$\sqrt{s}$$ s = 7 and 8 $$\,\mathrm{TeV}$$ TeV with the ATLAS detector’

G. Aad, B. Abbott, J. Abdallah, S. Abdel Khalek, more

The European Physical Journal C > 2016 > 76 > 11 > 1-14

The ATLAS measurement of the inclusive top quark pair ( $$t\bar{t}$$ t t ¯ ) cross-section $$\sigma _{t\bar{t}}$$ σ t t ¯ in proton–proton collisions at $$\sqrt{s}=8$$ s = 8 $$\,\mathrm{TeV}$$ TeV has been updated using the final 2012 luminosity calibration. The updated cross-section result is: $$\begin{aligned} \sigma _{t\bar{t}}= 242...

article

Measurement of the centrality dependence of the charged-particle pseudorapidity distribution in proton–lead collisions at $$\sqrt{s_{_\text {NN}}} = 5.02$$ s NN = 5.02 TeV with the ATLAS detector

G. Aad, T. Abajyan, B. Abbott, J. Abdallah, more

The European Physical Journal C > 2016 > 76 > 4 > 1-30

The centrality dependence of the mean charged-particle multiplicity as a function of pseudorapidity is measured in approximately 1 $$\upmu $$ μ b $$^{-1}$$ - 1 of proton–lead collisions at a nucleon–nucleon centre-of-mass energy of $$\sqrt{s_{_\text {NN}}} = 5.02$$ s NN = 5.02 $$\text {TeV}$$ TeV using the ATLAS detector at the Large Hadron Collider...

article

Measurement of the production of neighbouring jets in lead–lead collisions at sNN=2.76 TeV with the ATLAS detector

G. Aad, B. Abbott, J. Abdallah, S. Abdel Khalek, more

Physics Letters B > 2015 > 751 > C > 376-395

This Letter presents measurements of correlated production of nearby jets in Pb+Pb collisions at sNN=2.76 TeV using the ATLAS detector at the Large Hadron Collider. The measurement was performed using 0.14 nb−1 of data recorded in 2011. The production of correlated jet pairs was quantified using the rate, RΔR, of “neighbouring” jets that accompany “test” jets within a given range of angular distance,...

article

Erratum to: Measurement of the inclusive jet cross-section in proton-proton collisions at s = 7 $$ \sqrt{s}=7 $$ TeV using 4.5 fb⁻¹ of data with the ATLAS detector

The ATLAS collaboration, G. Aad, B. Abbott, J. Abdallah, more

Journal of High Energy Physics > 2015 > 2015 > 9 > 1-39

Abstract It was found that the non-perturbative corrections calculated using Pythia with the Perugia 2011 tune did not include the effect of the underlying event. The affected correction factors were recomputed using the Pythia 6.427 generator. These corrections are applied as baseline to the NLO pQCD calculations and thus the central values of the theoretical predictions have changed by a few percent...

article

Measurement of the forward-backward asymmetry of electron and muon pair-production in pp collisions at s = 7 $$ \sqrt{s}=7 $$ TeV with the ATLAS detector

The ATLAS collaboration, G. Aad, B. Abbott, J. Abdallah, more

Journal of High Energy Physics > 2015 > 2015 > 9 > 1-43

Abstract This paper presents measurements from the ATLAS experiment of the forward-backward asymmetry in the reaction pp → Z/γ^* → l⁺l⁻, with l being electrons or muons, and the extraction of the effective weak mixing angle. The results are based on the full set of data collected in 2011 in pp collisions at the LHC at s = 7 $$ \sqrt{s}=7 $$ TeV, corresponding to an integrated luminosity...

article

Centrality and rapidity dependence of inclusive jet production in sNN=5.02 TeV proton–lead collisions with the ATLAS detector

G. Aad, B. Abbott, J. Abdallah, S. Abdel Khalek, more

Physics Letters B > 2015 > 748 > Complete > 392-413

Measurements of the centrality and rapidity dependence of inclusive jet production in s_N _N=5.02 TeV proton-lead (p+Pb) collisions and the jet cross-section in s=2.76 TeV proton-proton collisions are presented. These quantities are measured in datasets corresponding to an integrated luminosity of 27.8 nb^- ¹ and 4.0 pb^- ¹, respectively, recorded with the ATLAS detector at the Large Hadron Collider in...

article

Search for new phenomena in events with three or more charged leptons in pp collisions at s=8 $$ \sqrt{s}=8 $$ TeV with the ATLAS detector

The ATLAS collaboration, G. Aad, B. Abbott, J. Abdallah, more

Journal of High Energy Physics > 2015 > 2015 > 8 > 1-60

Abstract A generic search for anomalous production of events with at least three charged leptons is presented. The data sample consists of pp collisions at s=8 $$ \sqrt{s}=8 $$ TeV collected in 2012 by the ATLAS experiment at the CERN Large Hadron Collider, and corresponds to an integrated luminosity of 20.3 fb⁻¹. Events are required to have at least three selected lepton candidates, at least two...

article

Differential top-antitop cross-section measurements as a function of observables constructed from final-state particles using pp collisions at s = 7 $$ \sqrt{s}=7 $$ TeV in the ATLAS detector

The ATLAS collaboration, G. Aad, B. Abbott, J. Abdallah, more

Journal of High Energy Physics > 2015 > 2015 > 6 > 1-56

Abstract Various differential cross-sections are measured in top-quark pair t t ¯ $$ \left(t\overline{t}\right) $$ events produced in proton-proton collisions at a centre-of-mass energy of s = 7 $$ \sqrt{s}=7 $$ TeV at the LHC with the ATLAS detector. These differential cross-sections are presented in a data set corresponding to an integrated luminosity of 4.6 fb⁻¹. The...

article

Search for squarks and gluinos in events with isolated leptons, jets and missing transverse momentum at s=8 $$ \sqrt{s}=8 $$ TeV with the ATLAS detector

The ATLAS collaboration, G. Aad, B. Abbott, J. Abdallah, more

Journal of High Energy Physics > 2015 > 2015 > 4 > 1-75

Abstract The results of a search for supersymmetry in final states containing at least one isolated lepton (electron or muon), jets and large missing transverse momentum with the ATLAS detector at the Large Hadron Collider are reported. The search is based on proton-proton collision data at a centre-of-mass energy s=8 $$ \sqrt{s}=8 $$ TeV collected in 2012, corresponding to an integrated luminosity...

article

Evidence for the Higgs-boson Yukawa coupling to tau leptons with the ATLAS detector

The ATLAS collaboration, G. Aad, B. Abbott, J. Abdallah, more

Journal of High Energy Physics > 2015 > 2015 > 4 > 1-74

Abstract Results of a search for H → ττ decays are presented, based on the full set of proton-proton collision data recorded by the ATLAS experiment at the LHC during 2011 and 2012. The data correspond to integrated luminosities of 4.5 fb⁻¹ and 20.3 fb⁻¹ at centre-of-mass energies of s=7 $$ \sqrt{s}=7 $$ TeV and s=8 $$ \sqrt{s}=8 $$ TeV respectively. All combinations of leptonic ( τ→ℓνν¯ $$ \tau...

article

Search for pair-produced long-lived neutral particles decaying to jets in the ATLAS hadronic calorimeter in pp collisions at s=8 TeV

G. Aad, B. Abbott, J. Abdallah, S. Abdel Khalek, more

Physics Letters B > 2015 > 743 > C > 15-34

The ATLAS detector at the Large Hadron Collider at CERN is used to search for the decay of a scalar boson to a pair of long-lived particles, neutral under the Standard Model gauge group, in 20.3 fb−1 of data collected in proton–proton collisions at s=8 TeV. This search is sensitive to long-lived particles that decay to Standard Model particles producing jets at the outer edge of the ATLAS electromagnetic...

article

Search for W′→tb¯ in the lepton plus jets final state in proton–proton collisions at a centre-of-mass energy of s=8 TeV with the ATLAS detector

G. Aad, B. Abbott, J. Abdallah, S. Abdel Khalek, more

Physics Letters B > 2015 > 743 > C > 235-255

A search for new charged massive gauge bosons, called W′, is performed with the ATLAS detector at the LHC, in proton–proton collisions at a centre-of-mass energy of s=8 TeV, using a dataset corresponding to an integrated luminosity of 20.3 fb−1. This analysis searches for W′ bosons in the W′→tb¯ decay channel in final states with electrons or muons, using a multivariate method based on boosted decision...

article

Search for H→γγ produced in association with top quarks and constraints on the Yukawa coupling between the top quark and the Higgs boson using data taken at 7 TeV and 8 TeV with the ATLAS detector

G. Aad, B. Abbott, J. Abdallah, S. Abdel Khalek, more

Physics Letters B > 2015 > 740 > Complete > 222-242

A search is performed for Higgs bosons produced in association with top quarks using the diphoton decay mode of the Higgs boson. Selection requirements are optimized separately for leptonic and fully hadronic final states from the top quark decays. The dataset used corresponds to an integrated luminosity of 4.5 fb^- ¹ of proton-proton collisions at a center-of-mass energy of 7 TeV and 20.3 fb...

article

Search for s-channel single top-quark production in proton–proton collisions at s=8 TeV with the ATLAS detector

G. Aad, B. Abbott, J. Abdallah, S. Abdel Khalek, more

Physics Letters B > 2015 > 740 > Complete > 118-136

This Letter presents a search at the LHC for s-channel single top-quark production in proton-proton collisions at a centre-of-mass energy of 8 TeV. The analyzed data set was recorded by the ATLAS detector and corresponds to an integrated luminosity of 20.3 fb^- ¹. Selected events contain one charged lepton, large missing transverse momentum and exactly two b-tagged jets. A multivariate event...

article

Search for the Xb and other hidden-beauty states in the π+π−ϒ(1S) channel at ATLAS

G. Aad, B. Abbott, J. Abdallah, S. Abdel Khalek, more

Physics Letters B > 2015 > 740 > Complete > 199-217

This Letter presents a search for a hidden-beauty counterpart of the X(3872) in the mass ranges of 10.05-10.31 GeV and 10.40-11.00 GeV, in the channel X_b->π⁺π^- (1S)(->μ⁺μ^-), using 16.2 fb^- ¹ of s=8 TeVpp collision data collected by the ATLAS detector at the LHC. No evidence for new narrow states is found, and upper limits are set on the product of the X_b cross section and branching fraction,...

article

Measurement of the charge asymmetry in dileptonic decays of top quark pairs in pp collisions at s = 7 $$ \sqrt{s}=7 $$ TeV using the ATLAS detector

The ATLAS collaboration, G. Aad, B. Abbott, J. Abdallah, more

Journal of High Energy Physics > 2015 > 2015 > 5 > 1-50

Abstract A measurement of the top-antitop t t ¯ $$ \left(t\overline{t}\right) $$ charge asymmetry is presented using data corresponding to an integrated luminosity of 4.6 fb⁻¹ of LHC pp collisions at a centreof-mass energy of 7 TeV collected by the ATLAS detector. Events with two charged leptons, at least two jets and large missing transverse momentum are selected. Two observables...

article

Measurement of the top-quark mass in the fully hadronic decay channel from ATLAS data at $$\sqrt{s}=7\mathrm{\,TeV}$$ s = 7 TeV

ATLAS Collaboration, G. Aad, B. Abbott, J. Abdallah, more

The European Physical Journal C > 2015 > 75 > 4 > 1-26

The mass of the top quark is measured in a data set corresponding to 4.6 $$\text{ fb }^{-1}$$ fb - 1 of proton–proton collisions with centre-of-mass energy $$\sqrt{s}=7$$ s = 7 TeV collected by the ATLAS detector at the LHC. Events consistent with hadronic decays of top–antitop quark pairs with at least six jets in the final state are selected. The substantial background...

article

Searches for heavy long-lived charged particles with the ATLAS detector in proton-proton collisions at s = 8 $$ \sqrt{s}=8 $$ TeV

The ATLAS collaboration, G. Aad, B. Abbott, J. Abdallah, more

Journal of High Energy Physics > 2015 > 2015 > 1 > 1-51

Abstract Searches for heavy long-lived charged particles are performed using a data sample of 19.1 fb⁻¹ from proton-proton collisions at a centre-of-mass energy of s = 8 $$ \sqrt{s}=8 $$ TeV collected by the ATLAS detector at the Large Hadron Collider. No excess is observed above the estimated background and limits are placed on the mass of long-lived particles in various supersymmetric...

article

Measurement of the W W + W Z cross section and limits on anomalous triple gauge couplings using final states with one lepton, missing transverse momentum, and two jets with the ATLAS detector at s = 7 $$ \sqrt{s}=7 $$ TeV

The ATLAS collaboration, G. Aad, B. Abbott, J. Abdallah, more

Journal of High Energy Physics > 2015 > 2015 > 1 > 1-42

Abstract The production of a W boson decaying to eν or μν in association with a W or Z boson decaying to two jets is studied using 4.6 fb⁻¹ of proton-proton collision data at s = 7 $$ \sqrt{s}=7 $$ TeV recorded with the ATLAS detector at the LHC. The combined WW + WZ cross section is measured with a significance of 3.4σ and is found to be 68±7 (stat.)±19 (syst.) pb, in agreement with the...

article

Jet energy measurement and its systematic uncertainty in proton–proton collisions at $$\sqrt{s}=7$$ s = 7 TeV with the ATLAS detector

Atlas Collaboration, G. Aad, T. Abajyan, B. Abbott, more

The European Physical Journal C > 2015 > 75 > 1 > 1-101

The jet energy scale (JES) and its systematic uncertainty are determined for jets measured with the ATLAS detector using proton–proton collision data with a centre-of-mass energy of $$\sqrt{s}=7$$ s = 7 TeV corresponding to an integrated luminosity of $$4.7$$ 4.7 $$\,\,\text{ fb }^{-1}$$ fb - 1 . Jets are reconstructed from energy deposits forming topological...

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Search results for: S. Bedikian

Addendum to ‘Measurement of the $$t\bar{t}$$ t t ¯ production cross-section using $$e\mu $$ e μ events with b-tagged jets in pp collisions at $$\sqrt{s}$$ s = 7 and 8 $$\,\mathrm{TeV}$$ TeV with the ATLAS detector’

Measurement of the centrality dependence of the charged-particle pseudorapidity distribution in proton–lead collisions at $$\sqrt{s_{_\text {NN}}} = 5.02$$ s NN = 5.02 TeV with the ATLAS detector

Measurement of the production of neighbouring jets in lead–lead collisions at sNN=2.76 TeV with the ATLAS detector

Erratum to: Measurement of the inclusive jet cross-section in proton-proton collisions at s = 7 $$ \sqrt{s}=7 $$ TeV using 4.5 fb⁻¹ of data with the ATLAS detector

Measurement of the forward-backward asymmetry of electron and muon pair-production in pp collisions at s = 7 $$ \sqrt{s}=7 $$ TeV with the ATLAS detector

Centrality and rapidity dependence of inclusive jet production in sNN=5.02 TeV proton–lead collisions with the ATLAS detector

Search for new phenomena in events with three or more charged leptons in pp collisions at s=8 $$ \sqrt{s}=8 $$ TeV with the ATLAS detector

Differential top-antitop cross-section measurements as a function of observables constructed from final-state particles using pp collisions at s = 7 $$ \sqrt{s}=7 $$ TeV in the ATLAS detector

Search for squarks and gluinos in events with isolated leptons, jets and missing transverse momentum at s=8 $$ \sqrt{s}=8 $$ TeV with the ATLAS detector

Evidence for the Higgs-boson Yukawa coupling to tau leptons with the ATLAS detector

Search for pair-produced long-lived neutral particles decaying to jets in the ATLAS hadronic calorimeter in pp collisions at s=8 TeV

Search for W′→tb¯ in the lepton plus jets final state in proton–proton collisions at a centre-of-mass energy of s=8 TeV with the ATLAS detector

Search for H→γγ produced in association with top quarks and constraints on the Yukawa coupling between the top quark and the Higgs boson using data taken at 7 TeV and 8 TeV with the ATLAS detector

Search for s-channel single top-quark production in proton–proton collisions at s=8 TeV with the ATLAS detector

Search for the Xb and other hidden-beauty states in the π+π−ϒ(1S) channel at ATLAS

Measurement of the charge asymmetry in dileptonic decays of top quark pairs in pp collisions at s = 7 $$ \sqrt{s}=7 $$ TeV using the ATLAS detector

Measurement of the top-quark mass in the fully hadronic decay channel from ATLAS data at $$\sqrt{s}=7\mathrm{\,TeV}$$ s = 7 TeV

Searches for heavy long-lived charged particles with the ATLAS detector in proton-proton collisions at s = 8 $$ \sqrt{s}=8 $$ TeV

Measurement of the W W + W Z cross section and limits on anomalous triple gauge couplings using final states with one lepton, missing transverse momentum, and two jets with the ATLAS detector at s = 7 $$ \sqrt{s}=7 $$ TeV

Jet energy measurement and its systematic uncertainty in proton–proton collisions at $$\sqrt{s}=7$$ s = 7 TeV with the ATLAS detector

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