The new LUCID-2 detector for luminosity measurement and monitoring in ATLAS

Avoni, G.; Bruschi, M.; Cabras, G.; Caforio, D.; Dehghanian, N.; Floderus, A.; Giacobbe, B.; Giannuzzi, Fabio; Giorgi, F. M.; Grafström, P.; Hedberg, V.; Manghi, F. Lasagni; Meneghini, S.; Pinfold, J. L.; Richards, E. G.; Sbarra, C.; Cesari, Nicola Semprini; Sbrizzi, A.; Soluk, R.; Ucchielli, G.; Valentinetti, S.; Viazlo, O.; Villa, M.; Vittori, C.; Vuillermet, R.; Zoccoli, À.

doi:10.1088/1748-0221/13/07/p07017

Cited by 370 publications

(179 citation statements)

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“…The integrated luminosity of the dataset is determined to be 139.0 ± 2.4 fb −1 , following a methodology similar to that detailed in Ref. [18], and using the LUCID-2 detector for the baseline luminosity measurements [19], from calibration of the luminosity scale using x-y beam-separation scans.…”

Section: Data and Simulationmentioning

confidence: 99%

Search for high-mass dilepton resonances using 139 fb−1 of pp collision data collected at s=13 TeV with the ATLAS detector

Aad¹,

Abbott²,

Abbott³

et al. 2019

Physics Letters B

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Search for high-mass dilepton resonances using139 fb −1 of p p collision data collected at √ s = 13 TeV with the ATLAS detectorThe ATLAS Collaboration A search for high-mass dielectron and dimuon resonances in the mass range of 250 GeV to 6 TeV is presented. The data were recorded by the ATLAS experiment in proton-proton collisions at a centre-of-mass energy of √ s = 13 TeV during Run 2 of the Large Hadron Collider and correspond to an integrated luminosity of 139 fb −1 . A functional form is fitted to the dilepton invariant-mass distribution to model the contribution from background processes, and a generic signal shape is used to determine the significance of observed deviations from this background estimate. No significant deviation is observed and upper limits are placed at the 95% confidence level on the fiducial cross-section times branching ratio for various resonance width hypotheses. The derived limits are shown to be applicable to spin-0, spin-1 and spin-2 signal hypotheses. For a set of benchmark models, the limits are converted into lower limits on the resonance mass and reach 4.5 TeV for the E 6 -motivated Z ψ boson. Also presented are limits on Heavy Vector Triplet model couplings.ATLAS [14-16] is a multipurpose detector with a forward-backward symmetric cylindrical geometry with respect to the LHC beam axis.1 The innermost layers consist of tracking detectors in the pseudorapidity range |η| < 2.5. This inner detector (ID) is surrounded by a thin superconducting solenoid that provides a 1 ATLAS uses a right-handed coordinate system with its origin at the nominal interaction point (IP) in the centre of the detector and the z-axis along the beam pipe. The x-axis points from the IP to the centre of the LHC ring, and the y-axis points upwards. Cylindrical coordinates (r, φ) are used in the transverse plane, φ being the azimuthal angle around the z-axis. The pseudorapidity is defined in terms of the polar angle θ as η = − ln tan(θ/2). Angular distance is measured in units of ∆R ≡ (∆η) 2 + (∆φ) 2 .

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Section: Data and Simulationmentioning

confidence: 99%

Search for high-mass dilepton resonances using 139 fb−1 of pp collision data collected at s=13 TeV with the ATLAS detector

Aad¹,

Abbott²,

Abbott³

et al. 2019

Physics Letters B

Self Cite

346

331

View full text Add to dashboard Cite

show abstract

“…It is derived, following a methodology similar to that detailed in Ref. [62], and using the LUCID-2 detector for the baseline luminosity measurements [63], from calibration of the luminosity scale using x-y beam-separation scans. This uncertainty is fully correlated across all measured cross-section bins and is propagated to the limit setting in the interpretations of the results.…”

Section: Uncertaintiesmentioning

confidence: 99%

Measurement of the four-lepton invariant mass spectrum in 13 TeV proton-proton collisions with the ATLAS detector

Aaboud¹,

Aad²,

Abbott³

et al. 2019

J. High Energ. Phys.

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A measurement of the four-lepton invariant mass spectrum is made with the ATLAS detector, using an integrated luminosity of 36.1 fb −1 of proton-proton collisions at √ s = 13 TeV delivered by the Large Hadron Collider. The differential cross-section is measured for events containing two same-flavour opposite-sign lepton pairs. It exhibits a rich structure, with different mass regions dominated in the Standard Model by single Z boson production, Higgs boson production, and Z boson pair production, and non-negligible interference effects at high invariant masses. The measurement is compared with state-of-the-art Standard Model calculations, which are found to be consistent with the data. These calculations are used to interpret the data in terms of gg → Z Z → 4 and Z → 4 subprocesses, and to place constraints on a possible contribution from physics beyond the Standard Model.

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“…In the collected data sample the average number of pp interactions per bunch crossing is 24, while the total integrated luminosity is 36.1 ± 0.8 fb −1 out of which 3.22 ± 0.07 fb −1 corresponds to the 2015 running period. The uncertainty in the combined 2015-2016 integrated luminosity is 2.1% [26], obtained using the LUCID-2 detector [27] for the primary luminosity measurements.…”

Section: Data Sample and Monte Carlo Simulationsmentioning

confidence: 99%

Measurement of the inclusive isolated-photon cross section in pp collisions at $$ \sqrt{s} $$ = 13 TeV using 36 fb−1 of ATLAS data

Aad

Abbott²,

Abbott³

et al. 2019

J. High Energ. Phys.

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Measurement of the inclusive isolated-photon cross section in pp collisions at √ s = 13 TeV using 36 fb −1 of ATLAS dataThe ATLAS CollaborationThe differential cross section for isolated-photon production in pp collisions is measured at a centre-of-mass energy of 13 TeV with the ATLAS detector at the LHC using an integrated luminosity of 36.1 fb −1 . The differential cross section is presented as a function of the photon transverse energy in different regions of photon pseudorapidity. The differential cross section as a function of the absolute value of the photon pseudorapidity is also presented in different regions of photon transverse energy. Next-to-leading-order QCD calculations from Jetphox and Sherpa as well as next-to-next-to-leading-order QCD calculations from Nnlojet are compared with the measurement, using several parameterisations of the proton parton distribution functions. The predictions provide a good description of the data within the experimental and theoretical uncertainties. c 2019 CERN for the benefit of the ATLAS Collaboration. Reproduction of this article or parts of it is allowed as specified in the CC-BY-4.0 license. γ T > 125 GeV and |η γ | < 2.37, excluding the region 1.37 < |η γ | < 1.56. In addition, the double-differential cross section as a function of |η γ | in different regions of E γ T is also presented. The results are based on a data sample with a more than ten-fold increase in statistics relative to the previous study [5]. The measurement presented here is found to be consistent with the previous one in the overlapping kinematic regions. This increase in statistics allows improvements in the calibration of the photon energy and reductions in the experimental systematic uncertainties affecting the cross-section measurement, as well as an extension of the coverage in E γ T to higher values than previously measured. In this analysis, the region where the measurement is limited by systematic uncertainties is extended to E γ T ∼ 1 TeV, beyond what was achieved in the previous measurement. The NLO QCD predictions of Jetphox [19,20] and Sherpa [21] based on several parameterisations of the PDFs are compared with the measurement. The NNLO QCD prediction of Nnlojet [16], which has significantly reduced uncertainties due to fewer missing higher-order terms, is also confronted with the data. ATLAS detectorThe ATLAS detector [22][23][24] is a multipurpose detector with a forward-backward symmetric cylindrical geometry. It consists of an inner tracking detector surrounded by a thin superconducting solenoid, electromagnetic and hadronic calorimeters, and a muon spectrometer incorporating three large superconducting toroid magnets. The inner-detector system is immersed in a 2 T axial magnetic field and provides charged-particle tracking in the range |η| < 2.5. The high-granularity silicon pixel detector is closest to the interaction region and provides four measurements per track. The pixel detector is followed by the silicon microstrip tracker, which typically provides four three-dimension...

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The new LUCID-2 detector for luminosity measurement and monitoring in ATLAS

Cited by 370 publications

References 14 publications

Search for high-mass dilepton resonances using 139 fb−1 of pp collision data collected at s=13 TeV with the ATLAS detector

Search for high-mass dilepton resonances using 139 fb−1 of pp collision data collected at s=13 TeV with the ATLAS detector

Measurement of the four-lepton invariant mass spectrum in 13 TeV proton-proton collisions with the ATLAS detector

Measurement of the inclusive isolated-photon cross section in pp collisions at $$ \sqrt{s} $$ = 13 TeV using 36 fb−1 of ATLAS data

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