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E. Gorini

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Arnab Bhattacharya

IIT Kanpur

University of Essex

Oleg Yu Vorobyev

Siberian Federal University

Kansas State University

Kathryn LaFevers Evans, Three Eagles

Pacifica Graduate Institute

Jesus De Las Heras

RedIRIS

Khurram Shehzad

National University of Sciences & Technology (NUST)

Willeke Wendrich

University of California, Los Angeles

Ahmad Salman Khan

University of Lahore, Lahore Pakistan

Carlo Bianchini

University of Pavia

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Papers by E. Gorini

Study of the performances of the level-1 trigger system for muons in the barrel of ATLAS with cosmic rays

2008 IEEE Nuclear Science Symposium Conference Record, 2008

Abstract The muon trigger in ATLAS is crucial for all the main physics channels to be studied at ... more Abstract The muon trigger in ATLAS is crucial for all the main physics channels to be studied at the design center of mass energy and luminosity of LHC and also for the initial phase of data taking with beams for the calibration of all the detectors. The level-1 trigger system for muons in ATLAS is performed using dedicated RPC chambers in the| η|≪ 1 region. The trigger electronics provides both trigger and readout information. This system is being commissioned using cosmic rays with the full trigger and data acquisition chains. ...

Ageing test of ATLAS RPCs at CERN's gamma irradiation facility

IEEE Symposium Conference Record Nuclear Science 2004., 2004

An ageing test of three ATLAS production RPC stations is in progress at X5 GIF, the CERN irradiat... more An ageing test of three ATLAS production RPC stations is in progress at X5 GIF, the CERN irradiation facility. The chamber efficiency as a function of the operating voltage is measured at different source intensities, up to a maximum counting rate of about 700 Hz/cm 2 . All along the test, plate resistivity has been monitored using two different methods: by measuring the I-V characteristics in pure Ar, and by comparing the efficiency vs high voltage curves at different source intensities. The increase in plate resistivity, which is one of the dominant ageing effects for RPCs with phenolic-melaminic electrodes, has been shown to be strongly dependent on environmental relative humidity. Indeed, after setting to values between 40% and 50% the relative humidity of both the operating gas and the air surrounding the chambers, a significant decrease of the plate resistivity has been observed.

The Level-1 Trigger Muon Barrel System of the ATLAS experiment at CERN

Journal of Instrumentation, 2009

ABSTRACT: The ATLAS Level-1 Muon Barrel Trigger is one of the main elements of the first stage of... more ABSTRACT: The ATLAS Level-1 Muon Barrel Trigger is one of the main elements of the first stage of event selection of the ATLAS experiment at the Large Hadron Collider. The challenge of the Level-1 system is a reduction of the event rate from a collision rate of 40 MHz by a factor 103, using simple algorithms that can be executed in highly parallel custom electronics with a latency of the order of 1 µs. The input stage of the Level-1 Muon consists of an array of processors receiving the full granularity of data from a dedicated detector ( ...

The Atlas RPC Test Stands

Astroparticle, Particle and Space Physics, Detectors and Medical Physics Applications - Proceedings of the 9th Conference, 2006

The trigger system for the Barrel Muon Spectrometer of the ATLAS experiment at LHC will be realiz... more The trigger system for the Barrel Muon Spectrometer of the ATLAS experiment at LHC will be realized with 1116 Resistive Plate Chambers1 (RPC) units for a total surface of about 4000 m2. The difficulty in accessing the apparatus after the installation has been completed demands a rigorous quality control (Quality Assurance) for each detector. To achieve this task three different

The KLOE drift chamber VCI 2001

Nuclear Instruments & Methods in Physics Research Section a-Accelerators Spectrometers Detectors and Associated Equipment, 2002

The main goal of the KLOE experiment at the Frascati DAΦNE φ− factory is the study CP violation i... more The main goal of the KLOE experiment at the Frascati DAΦNE φ− factory is the study CP violation in kaon decays. The tracking device of the experiment is a drift chamber whose dimensions, 4m of diameter and 3.3 m length, provide a large acceptance volume for the decay products of low momentum KL (λ L= 3.4 m). A complete stereo geometry with 12.582 cells arranged in 58 layers guarantees a high and uniform efficiency in the reconstruction of the charged KL decays. Very light materials have been chosen both for the drift medium, a ...

Muon Detection Based on a Hadronic Calorimeter

The ATLAS Tile hadronic calorimeter (TileCal) provides highly-segmented energy measurements of in... more The ATLAS Tile hadronic calorimeter (TileCal) provides highly-segmented energy measurements of incoming particles. The information from TileCal's last segmentation layer can assist in muon tagging and it is being considered for a future upgrade of the level-one trigger to reject triggers due to radiation background effects in the barrel region. A muon receiver for the TileCal muon signals is being

KLOE results on ø radiative decays

Nuclear Physics A, 2003

Study of the a0 (980) meson via the radiative decay φ{symbol} → η π0 γ with the KLOE detector

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2009

Study of the a 0 (980) meson via the radiative decay φ → ηπ 0 γ with the KLOE detector

Search for new phenomena in photon + jet events collected in proton-proton collisions at √s = 8 TeV with the ATLAS detector

√ s = 8 TeV with the ATLAS detector ✩ .ATLAS Collaboration a r t i c l e i n f o a b s t r a c t

Search for the Standard Model Higgs boson in the decay channel H→ZZ(*)→4ℓ with the ATLAS detector

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2011

Search for the Standard Model Higgs boson in the decay channel H → Z Z ( * ) → 4 with 4.8 fb −1 o... more Search for the Standard Model Higgs boson in the decay channel H → Z Z ( * ) → 4 with 4.8 fb −1 of pp collision data at √ s = 7 TeV with ATLAS ✩ .ATLAS Collaboration a r t i c l e i n f o a b s t r a c t Article history: This Letter presents a search for the Standard Model Higgs boson in the decay channel H → Z Z ( * ) → + − + − , where , = e or μ, using proton-proton collisions at √ s = 7 TeV recorded with the ATLAS detector and corresponding to an integrated luminosity of 4.8 fb −1 . The four-lepton invariant mass distribution is compared with Standard Model background expectations to derive upper limits on the cross section of a Standard Model Higgs boson with a mass between 110 GeV and 600 GeV. The mass ranges 134-156 GeV, 182-233 GeV, 256-265 GeV and 268-415 GeV are excluded at the 95% confidence level. The largest upward deviations from the background-only hypothesis are observed for Higgs boson masses of 125 GeV, 244 GeV and 500 GeV with local significances of 2.1, 2.2 and 2.1 standard deviations, respectively. Once the look-elsewhere effect is considered, none of these excesses are significant.

Search for pair production of first or second generation leptoquarks in proton-proton collisions at √s=7TeV using the ATLAS detector at the LHC

Physical Review D - Particles, Fields, Gravitation and Cosmology, 2011

Search for heavy long-lived charged particles with the ATLAS detector in pp collisions at √s=7 TeV

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2011

... Caloi 132a , 132b , D. Calvet 33 , S. Calvet 33 , R. Camacho Toro 33 , P. Camarri 133a , 133b... more

Measurement of the Υ(1S) production cross-section in pp collisions at s=7 TeV in ATLAS

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2011

A measurement of the cross-section for ϒ(1S) → µ + µ − production in proton-proton collisions at ... more A measurement of the cross-section for ϒ(1S) → µ + µ − production in proton-proton collisions at centre of mass energy of 7 TeV is presented. The cross-section is measured as a function of the ϒ(1S) transverse momentum in two bins of rapidity, |y ϒ(1S) | < 1.2 and 1.2 < |y ϒ(1S) | < 2.4. The measurement requires that both muons have transverse momentum p µ T > 4 GeV and pseudorapidity |η µ | < 2.5 in order to reduce theoretical uncertainties on the acceptance, which depend on the poorly known polarization. The results are based on an integrated luminosity of 1.13 pb −1 , collected with the ATLAS detector at the Large Hadron Collider. The cross-section measurement is compared to theoretical predictions: it agrees to within a factor of two with a prediction based on the NRQCD model including colour-singlet and colour-octet matrix elements as implemented in PYTHIA while it disagrees by up to a factor of ten with the next-to-leading order prediction based on the colour-singlet-model.

A search for new physics in dijet mass and angular distributions in ppcollisions at √s=7 TeV measured with the ATLAS detector

New Journal of Physics, 2011

A search for new interactions and resonances produced in LHC proton-proton (pp) collisions at a c... more

Search for supersymmetry with jets, missing transverse momentum and at least one hadronically decaying τ lepton in proton-proton collisions at s=7TeV with the ATLAS detector

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2012

Search for supersymmetry with jets, missing transverse momentum and at least one hadronically dec... more Search for supersymmetry with jets, missing transverse momentum and at least one hadronically decaying τ lepton in proton-proton collisions at √ s = 7 TeV with the ATLAS detector ✩ .ATLAS Collaboration a r t i c l e i n f o a b s t r a c t A search for production of supersymmetric particles in final states containing jets, missing transverse momentum, and at least one hadronically decaying τ lepton is presented. The data were recorded by the ATLAS experiment in √ s = 7 TeV proton-proton collisions at the Large Hadron Collider. No excess above the Standard Model background expectation was observed in 2.05 fb −1 of data. The results are interpreted in the context of gauge mediated supersymmetry breaking models with M mess = 250 TeV, N 5 = 3, μ > 0, and C grav = 1. The production of supersymmetric particles is excluded at 95% C.L. up to a supersymmetry breaking scale Λ = 30 TeV, independent of tan β, and up to Λ = 43 TeV for large tan β.

Search for excited leptons in proton-proton collisions at √s=7TeV with the ATLAS detector

Physical Review D - Particles, Fields, Gravitation and Cosmology, 2012

The ATLAS detector is used to search for excited leptons in the electromagnetic radiative decay c... more The ATLAS detector is used to search for excited leptons in the electromagnetic radiative decay channel ' Ã ! '. Results are presented based on the analysis of pp collisions at a center-of-mass energy of 7 TeV corresponding to an integrated luminosity of 2:05 fb À1 . No evidence for excited leptons is found, and limits are set on the compositeness scale Ã as a function of the excited lepton mass m ' Ã . In the special case where Ã ¼ m ' Ã , excited electron and muon masses below 1.87 TeV and 1.75 TeV are excluded at 95% C.L., respectively.

Performance of the ATLAS trigger system in 2010

European Physical Journal C, 2012

Proton-proton collisions at √ s = 7 TeV and heavy ion collisions at √ s NN = 2.76 TeV were produc... more Proton-proton collisions at √ s = 7 TeV and heavy ion collisions at √ s NN = 2.76 TeV were produced by the LHC and recorded using the ATLAS experiment's trigger system in 2010. The LHC is designed with a maximum bunch crossing rate of 40 MHz and the ATLAS trigger system is designed to record approximately 200 of these per second. The trigger system selects events by rapidly identifying signatures of muon, electron, photon, tau lepton, jet, and B meson candidates, as well as using global event signatures, such as missing transverse energy. An overview of the ATLAS trigger system, the evolution of the system during 2010 and the performance of the trigger system components and selections based on the 2010 collision data are shown. A brief outline of plans for the trigger system in 2011 is presented.

Measurement of the top quark pair production cross-section with ATLAS in the single lepton channel

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2012

A measurement of the production cross-section for top quark pairs (tt) in pp collisions at √ s = ... more A measurement of the production cross-section for top quark pairs (tt) in pp collisions at √ s = 7 TeV is presented using data recorded with the ATLAS detector at the Large Hadron Collider. Events are selected in two different topologies: single lepton (electron e or muon µ) with large missing transverse energy and at least four jets, and dilepton (ee, µµ or eµ) with large missing transverse energy and at least two jets. In a data sample of 2.9 pb −1 , 37 candidate events are observed in the single-lepton topology and 9 events in the dilepton topology. The corresponding expected backgrounds from non-tt Standard Model processes are estimated using data-driven methods and determined to be 12.2 ± 3.9 events and 2.5 ± 0.6 events, respectively. The kinematic properties of the selected events are consistent with SM tt production. The inclusive top quark pair production cross-section is measured to be

Measurement of the top quark pair cross section with ATLAS in pp collisions at s=7 TeV using final states with an electron or a muon and a hadronically decaying τ lepton

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2012

A measurement of the cross section of top quark pair production in proton--proton collisions reco... more A measurement of the cross section of top quark pair production in proton--proton collisions recorded with the ATLAS detector at the Large Hadron Collider at a centre-of-mass energy of 7 TeV is reported. The data sample used corresponds to an integrated luminosity of 2.05 fb-1. Events with an isolated electron or muon and a tau lepton decaying hadronically are used. In addition, a large missing transverse momentum and two or more energetic jets are required. At least one of the jets must be identified as originating from ab quark. The ...

Measurement of the charge asymmetry in top quark pair production in pp collisions at √s = 7 TeV using the ATLAS detector

European Physical Journal C, 2012

Study of the performances of the level-1 trigger system for muons in the barrel of ATLAS with cosmic rays

2008 IEEE Nuclear Science Symposium Conference Record, 2008

Abstract The muon trigger in ATLAS is crucial for all the main physics channels to be studied at ... more Abstract The muon trigger in ATLAS is crucial for all the main physics channels to be studied at the design center of mass energy and luminosity of LHC and also for the initial phase of data taking with beams for the calibration of all the detectors. The level-1 trigger system for muons in ATLAS is performed using dedicated RPC chambers in the| η|≪ 1 region. The trigger electronics provides both trigger and readout information. This system is being commissioned using cosmic rays with the full trigger and data acquisition chains. ...

Ageing test of ATLAS RPCs at CERN's gamma irradiation facility

IEEE Symposium Conference Record Nuclear Science 2004., 2004

An ageing test of three ATLAS production RPC stations is in progress at X5 GIF, the CERN irradiat... more An ageing test of three ATLAS production RPC stations is in progress at X5 GIF, the CERN irradiation facility. The chamber efficiency as a function of the operating voltage is measured at different source intensities, up to a maximum counting rate of about 700 Hz/cm 2 . All along the test, plate resistivity has been monitored using two different methods: by measuring the I-V characteristics in pure Ar, and by comparing the efficiency vs high voltage curves at different source intensities. The increase in plate resistivity, which is one of the dominant ageing effects for RPCs with phenolic-melaminic electrodes, has been shown to be strongly dependent on environmental relative humidity. Indeed, after setting to values between 40% and 50% the relative humidity of both the operating gas and the air surrounding the chambers, a significant decrease of the plate resistivity has been observed.

The Level-1 Trigger Muon Barrel System of the ATLAS experiment at CERN

Journal of Instrumentation, 2009

ABSTRACT: The ATLAS Level-1 Muon Barrel Trigger is one of the main elements of the first stage of... more ABSTRACT: The ATLAS Level-1 Muon Barrel Trigger is one of the main elements of the first stage of event selection of the ATLAS experiment at the Large Hadron Collider. The challenge of the Level-1 system is a reduction of the event rate from a collision rate of 40 MHz by a factor 103, using simple algorithms that can be executed in highly parallel custom electronics with a latency of the order of 1 µs. The input stage of the Level-1 Muon consists of an array of processors receiving the full granularity of data from a dedicated detector ( ...

The Atlas RPC Test Stands

Astroparticle, Particle and Space Physics, Detectors and Medical Physics Applications - Proceedings of the 9th Conference, 2006

The trigger system for the Barrel Muon Spectrometer of the ATLAS experiment at LHC will be realiz... more The trigger system for the Barrel Muon Spectrometer of the ATLAS experiment at LHC will be realized with 1116 Resistive Plate Chambers1 (RPC) units for a total surface of about 4000 m2. The difficulty in accessing the apparatus after the installation has been completed demands a rigorous quality control (Quality Assurance) for each detector. To achieve this task three different

The KLOE drift chamber VCI 2001

Nuclear Instruments & Methods in Physics Research Section a-Accelerators Spectrometers Detectors and Associated Equipment, 2002

The main goal of the KLOE experiment at the Frascati DAΦNE φ− factory is the study CP violation i... more The main goal of the KLOE experiment at the Frascati DAΦNE φ− factory is the study CP violation in kaon decays. The tracking device of the experiment is a drift chamber whose dimensions, 4m of diameter and 3.3 m length, provide a large acceptance volume for the decay products of low momentum KL (λ L= 3.4 m). A complete stereo geometry with 12.582 cells arranged in 58 layers guarantees a high and uniform efficiency in the reconstruction of the charged KL decays. Very light materials have been chosen both for the drift medium, a ...

Muon Detection Based on a Hadronic Calorimeter

The ATLAS Tile hadronic calorimeter (TileCal) provides highly-segmented energy measurements of in... more The ATLAS Tile hadronic calorimeter (TileCal) provides highly-segmented energy measurements of incoming particles. The information from TileCal's last segmentation layer can assist in muon tagging and it is being considered for a future upgrade of the level-one trigger to reject triggers due to radiation background effects in the barrel region. A muon receiver for the TileCal muon signals is being

KLOE results on ø radiative decays

Nuclear Physics A, 2003

Study of the a0 (980) meson via the radiative decay φ{symbol} → η π0 γ with the KLOE detector

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2009

Study of the a 0 (980) meson via the radiative decay φ → ηπ 0 γ with the KLOE detector

Search for new phenomena in photon + jet events collected in proton-proton collisions at √s = 8 TeV with the ATLAS detector

√ s = 8 TeV with the ATLAS detector ✩ .ATLAS Collaboration a r t i c l e i n f o a b s t r a c t

Search for the Standard Model Higgs boson in the decay channel H→ZZ(*)→4ℓ with the ATLAS detector

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2011

Search for the Standard Model Higgs boson in the decay channel H → Z Z ( * ) → 4 with 4.8 fb −1 o... more Search for the Standard Model Higgs boson in the decay channel H → Z Z ( * ) → 4 with 4.8 fb −1 of pp collision data at √ s = 7 TeV with ATLAS ✩ .ATLAS Collaboration a r t i c l e i n f o a b s t r a c t Article history: This Letter presents a search for the Standard Model Higgs boson in the decay channel H → Z Z ( * ) → + − + − , where , = e or μ, using proton-proton collisions at √ s = 7 TeV recorded with the ATLAS detector and corresponding to an integrated luminosity of 4.8 fb −1 . The four-lepton invariant mass distribution is compared with Standard Model background expectations to derive upper limits on the cross section of a Standard Model Higgs boson with a mass between 110 GeV and 600 GeV. The mass ranges 134-156 GeV, 182-233 GeV, 256-265 GeV and 268-415 GeV are excluded at the 95% confidence level. The largest upward deviations from the background-only hypothesis are observed for Higgs boson masses of 125 GeV, 244 GeV and 500 GeV with local significances of 2.1, 2.2 and 2.1 standard deviations, respectively. Once the look-elsewhere effect is considered, none of these excesses are significant.

Search for pair production of first or second generation leptoquarks in proton-proton collisions at √s=7TeV using the ATLAS detector at the LHC

Physical Review D - Particles, Fields, Gravitation and Cosmology, 2011

Search for heavy long-lived charged particles with the ATLAS detector in pp collisions at √s=7 TeV

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2011

... Caloi 132a , 132b , D. Calvet 33 , S. Calvet 33 , R. Camacho Toro 33 , P. Camarri 133a , 133b... more

Measurement of the Υ(1S) production cross-section in pp collisions at s=7 TeV in ATLAS

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2011

A measurement of the cross-section for ϒ(1S) → µ + µ − production in proton-proton collisions at ... more A measurement of the cross-section for ϒ(1S) → µ + µ − production in proton-proton collisions at centre of mass energy of 7 TeV is presented. The cross-section is measured as a function of the ϒ(1S) transverse momentum in two bins of rapidity, |y ϒ(1S) | < 1.2 and 1.2 < |y ϒ(1S) | < 2.4. The measurement requires that both muons have transverse momentum p µ T > 4 GeV and pseudorapidity |η µ | < 2.5 in order to reduce theoretical uncertainties on the acceptance, which depend on the poorly known polarization. The results are based on an integrated luminosity of 1.13 pb −1 , collected with the ATLAS detector at the Large Hadron Collider. The cross-section measurement is compared to theoretical predictions: it agrees to within a factor of two with a prediction based on the NRQCD model including colour-singlet and colour-octet matrix elements as implemented in PYTHIA while it disagrees by up to a factor of ten with the next-to-leading order prediction based on the colour-singlet-model.

A search for new physics in dijet mass and angular distributions in ppcollisions at √s=7 TeV measured with the ATLAS detector

New Journal of Physics, 2011

A search for new interactions and resonances produced in LHC proton-proton (pp) collisions at a c... more

Search for supersymmetry with jets, missing transverse momentum and at least one hadronically decaying τ lepton in proton-proton collisions at s=7TeV with the ATLAS detector

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2012

Search for supersymmetry with jets, missing transverse momentum and at least one hadronically dec... more Search for supersymmetry with jets, missing transverse momentum and at least one hadronically decaying τ lepton in proton-proton collisions at √ s = 7 TeV with the ATLAS detector ✩ .ATLAS Collaboration a r t i c l e i n f o a b s t r a c t A search for production of supersymmetric particles in final states containing jets, missing transverse momentum, and at least one hadronically decaying τ lepton is presented. The data were recorded by the ATLAS experiment in √ s = 7 TeV proton-proton collisions at the Large Hadron Collider. No excess above the Standard Model background expectation was observed in 2.05 fb −1 of data. The results are interpreted in the context of gauge mediated supersymmetry breaking models with M mess = 250 TeV, N 5 = 3, μ > 0, and C grav = 1. The production of supersymmetric particles is excluded at 95% C.L. up to a supersymmetry breaking scale Λ = 30 TeV, independent of tan β, and up to Λ = 43 TeV for large tan β.

Search for excited leptons in proton-proton collisions at √s=7TeV with the ATLAS detector

Physical Review D - Particles, Fields, Gravitation and Cosmology, 2012

The ATLAS detector is used to search for excited leptons in the electromagnetic radiative decay c... more The ATLAS detector is used to search for excited leptons in the electromagnetic radiative decay channel ' Ã ! '. Results are presented based on the analysis of pp collisions at a center-of-mass energy of 7 TeV corresponding to an integrated luminosity of 2:05 fb À1 . No evidence for excited leptons is found, and limits are set on the compositeness scale Ã as a function of the excited lepton mass m ' Ã . In the special case where Ã ¼ m ' Ã , excited electron and muon masses below 1.87 TeV and 1.75 TeV are excluded at 95% C.L., respectively.

Performance of the ATLAS trigger system in 2010

European Physical Journal C, 2012

Proton-proton collisions at √ s = 7 TeV and heavy ion collisions at √ s NN = 2.76 TeV were produc... more Proton-proton collisions at √ s = 7 TeV and heavy ion collisions at √ s NN = 2.76 TeV were produced by the LHC and recorded using the ATLAS experiment's trigger system in 2010. The LHC is designed with a maximum bunch crossing rate of 40 MHz and the ATLAS trigger system is designed to record approximately 200 of these per second. The trigger system selects events by rapidly identifying signatures of muon, electron, photon, tau lepton, jet, and B meson candidates, as well as using global event signatures, such as missing transverse energy. An overview of the ATLAS trigger system, the evolution of the system during 2010 and the performance of the trigger system components and selections based on the 2010 collision data are shown. A brief outline of plans for the trigger system in 2011 is presented.

Measurement of the top quark pair production cross-section with ATLAS in the single lepton channel

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2012

A measurement of the production cross-section for top quark pairs (tt) in pp collisions at √ s = ... more A measurement of the production cross-section for top quark pairs (tt) in pp collisions at √ s = 7 TeV is presented using data recorded with the ATLAS detector at the Large Hadron Collider. Events are selected in two different topologies: single lepton (electron e or muon µ) with large missing transverse energy and at least four jets, and dilepton (ee, µµ or eµ) with large missing transverse energy and at least two jets. In a data sample of 2.9 pb −1 , 37 candidate events are observed in the single-lepton topology and 9 events in the dilepton topology. The corresponding expected backgrounds from non-tt Standard Model processes are estimated using data-driven methods and determined to be 12.2 ± 3.9 events and 2.5 ± 0.6 events, respectively. The kinematic properties of the selected events are consistent with SM tt production. The inclusive top quark pair production cross-section is measured to be

Measurement of the top quark pair cross section with ATLAS in pp collisions at s=7 TeV using final states with an electron or a muon and a hadronically decaying τ lepton

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2012

A measurement of the cross section of top quark pair production in proton--proton collisions reco... more A measurement of the cross section of top quark pair production in proton--proton collisions recorded with the ATLAS detector at the Large Hadron Collider at a centre-of-mass energy of 7 TeV is reported. The data sample used corresponds to an integrated luminosity of 2.05 fb-1. Events with an isolated electron or muon and a tau lepton decaying hadronically are used. In addition, a large missing transverse momentum and two or more energetic jets are required. At least one of the jets must be identified as originating from ab quark. The ...

Measurement of the charge asymmetry in top quark pair production in pp collisions at √s = 7 TeV using the ATLAS detector

European Physical Journal C, 2012