Showing **10** of **690** results

The
ATLAS
collaboration
Aaboud, Morad
;
Aad, Georges
;
Abbott, Brad
;
*et al. *

Phys.Lett.B 777 (2018) 303-323, 2018.

https://inspirehep.net/literature/1615866
Inspire Record
1615866
DOI
10.17182/hepdata.79947
https://doi.org/10.17182/hepdata.79947
The production of exclusive $\gamma \gamma \rightarrow \mu^+ \mu^-$ events in proton--proton collisions at a centre-of-mass energy of 13 TeV is measured with the ATLAS detector at the LHC, using data corresponding to an integrated luminosity of 3.2 fb$^{-1}$. The measurement is performed for a dimuon invariant mass of 12 GeV $<m_{\mu^+\mu^-}<$ 70 GeV. The integrated cross-section is determined within a fiducial acceptance region of the ATLAS detector and differential cross-sections are measured as a function of the dimuon invariant mass. The results are compared to theoretical predictions that include corrections for absorptive effects.

0
data tables
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The
ATLAS
collaboration
Aaboud, Morad
;
Aad, Georges
;
Abbott, Brad
;
*et al. *

JHEP 01 (2017) 099, 2017.

https://inspirehep.net/literature/1494075
Inspire Record
1494075
DOI
10.17182/hepdata.76732
https://doi.org/10.17182/hepdata.76732
A measurement of the $ZZ$ production in the $\ell^{-}\ell^{+}\ell^{\prime -}\ell^{\prime +}$ and $\ell^{-}\ell^{+}\nu\bar{\nu}$ channels $(\ell = e, \mu)$ in proton--proton collisions at $\sqrt{s} = 8$ TeV at the Large Hadron Collider at CERN, using data corresponding to an integrated luminosity of 20.3 fb$^{-1}$ collected by the ATLAS experiment in 2012 is presented. The fiducial cross sections for $ZZ\to\ell^{-}\ell^{+}\ell^{\prime -}\ell^{\prime +}$ and $ZZ\to \ell^{-}\ell^{+}\nu\bar{\nu}$ are measured in selected phase-space regions. The total cross section for $ZZ$ events produced with both $Z$ bosons in the mass range 66 to 116 GeV is measured from the combination of the two channels to be $7.3\pm0.4\textrm{(stat)}\pm0.3\textrm{(syst)}\pm0.2\textrm{(lumi)}$ pb, which is consistent with the Standard Model prediction of $6.6^{+0.7}_{-0.6}$ pb. The differential cross sections in bins of various kinematic variables are presented. The differential event yield as a function of the transverse momentum of the leading $Z$ boson is used to set limits on anomalous neutral triple gauge boson couplings in $ZZ$ production.

0
data tables
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The
ATLAS
collaboration
Aad, Georges
;
Abbott, Brad
;
Abdallah, Jalal
;
*et al. *

Phys.Lett.B 749 (2015) 242-261, 2015.

https://inspirehep.net/literature/1377585
Inspire Record
1377585
DOI
10.17182/hepdata.69286
https://doi.org/10.17182/hepdata.69286
This Letter reports a measurement of the exclusive $\gamma\gamma\rightarrow \ell^+\ell^- (\ell=e, \mu)$ cross-section in proton-proton collisions at a centre-of-mass energy of 7 TeV by the ATLAS experiment at the LHC, based on an integrated luminosity of $4.6$ fb$^{-1}$. For the electron or muon pairs satisfying exclusive selection criteria, a fit to the dilepton acoplanarity distribution is used to extract the fiducial cross-sections. The cross-section in the electron channel is determined to be $\sigma_{\gamma\gamma\rightarrow e^+e^-}^{\mathrm{excl.}} = 0.428 \pm 0.035 (\mathrm{stat.}) \pm 0.018 (\mathrm{syst.})$ pb for a phase-space region with invariant mass of the electron pairs greater than 24 GeV, in which both electrons have transverse momentum $p_\mathrm{T}>12$ GeV and pseudorapidity $|\eta|<2.4$. For muon pairs with invariant mass greater than 20 GeV, muon transverse momentum $p_\mathrm{T}>10$ GeV and pseudorapidity $|\eta|<2.4$, the cross-section is determined to be $\sigma_{\gamma\gamma\rightarrow \mu^+\mu^- }^{\mathrm{excl.}} = 0.628 \pm 0.032 (\mathrm{stat.}) \pm 0.021 (\mathrm{syst.})$ pb. When proton absorptive effects due to the finite size of the proton are taken into account in the theory calculation, the measured cross-sections are found to be consistent with the theory prediction.

0
data tables
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Version 2

Charged-particle distributions at low transverse momentum in $\sqrt{s}$=13 TeV pp interactions measured with the ATLAS detector at the LHC
The
ATLAS
collaboration
Aaboud, Morad
;
Aad, Georges
;
Abbott, Brad
;
*et al. *

Eur.Phys.J.C 76 (2016) 502, 2016.

https://inspirehep.net/literature/1467230
Inspire Record
1467230
DOI
10.17182/hepdata.73907
https://doi.org/10.17182/hepdata.73907
Measurements of distributions of charged particles produced in proton-proton collisions with a centre-of-mass energy of 13 TeV are presented. The data were recorded by the ATLAS detector at the LHC and correspond to an integrated luminosity of 151 $\mu$b$^{-1}$. The particles are required to have a transverse momentum greater than 100 MeV and an absolute pseudorapidity less than 2.5. The charged-particle multiplicity, its dependence on transverse momentum and pseudorapidity and the dependence of the mean transverse momentum on multiplicity are measured in events containing at least two charged particles satisfying the above kinematic criteria. The results are corrected for detector effects and compared to the predictions from several Monte Carlo event generators.

0
data tables
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Version 2

Search for dark photons from Higgs boson decays via $ZH$ production with a photon plus missing transverse momentum signature from $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
The
ATLAS
collaboration

ATLAS-CONF-2022-064, 2022.

https://inspirehep.net/literature/2157039
Inspire Record
2157039
DOI
10.17182/hepdata.135387
https://doi.org/10.17182/hepdata.135387
This paper describes a search for dark photons ($\gamma_d$) in Higgs boson decay ($H \to \gamma\gamma_d$) produced in proton-proton collisions through the $ZH$ production mode at the Large Hadron Collider at $\sqrt{s}=13$ TeV. The transverse mass of the photon and the missing transverse momentum from the non-interacting $\gamma_d$ would present a distinctive signature at the Higgs boson mass resonance. The results presented use the total Run-2 integrated luminosity of 139 fb$^{-1}$, recorded by the ATLAS detector at the LHC . The dominant reducible background processes have been estimated using data-driven techniques. A Boosted Decision Tree (BDT) technique was adopted to enhance the sensitivity of the search. Given that no excess is observed with respect to the Standard Model predictions, an observed (expected) upper limit on the branching ratio BR$(H\to \gamma\gamma_d)$ of 2.28$\%$ (2.82$^{+1.33}_{-0.84}\%$) is set at 95$\%$ CL for massless $\gamma_d$. For higher dark photons masses up to 40 GeV, the observed (expected) upper limits at 95$\%$ CL are found to be within the [2.19-2.52]$\%$ ([2.71-3.11]$\%$) range.

9
data tables
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The
ATLAS
collaboration
Aad, Georges
;
Abbott, Brad
;
Abbott, Dale Charles
;
*et al. *

Eur.Phys.J.C 80 (2020) 942, 2020.

https://inspirehep.net/literature/1790439
Inspire Record
1790439
DOI
10.17182/hepdata.94312
https://doi.org/10.17182/hepdata.94312
Inclusive and differential fiducial cross sections of the Higgs boson are measured in the $H \to ZZ^{*} \to 4\ell$ ($\ell = e,\mu$) decay channel. The results are based on proton$-$proton collision data produced at the Large Hadron Collider at a centre-of-mass energy of 13 TeV and recorded by the ATLAS detector from 2015 to 2018, equivalent to an integrated luminosity of 139 fb$^{-1}$. The inclusive fiducial cross section for the $H \to ZZ^{*} \to 4\ell$ process is measured to be $\sigma_\mathrm{fid} = 3.28 \pm 0.32$ fb, in agreement with the Standard Model prediction of $\sigma_\mathrm{fid, SM} = 3.41 \pm 0.18 $ fb. Differential fiducial cross sections are measured for a variety of observables which are sensitive to the production and decay of the Higgs boson. All measurements are in agreement with the Standard Model predictions. The results are used to constrain anomalous Higgs boson interactions with Standard Model particles.

76
data tables
match query

The
ATLAS
collaboration
Aaboud, Morad
;
Aad, Georges
;
Abbott, Brad
;
*et al. *

Eur.Phys.J.C 78 (2018) 997, 2018.

https://inspirehep.net/literature/1686834
Inspire Record
1686834
DOI
10.17182/hepdata.84427
https://doi.org/10.17182/hepdata.84427
Measurements of the azimuthal anisotropy in lead-lead collisions at $\sqrt{s_\mathrm{NN}} = 5.02$ TeV are presented using a data sample corresponding to 0.49 $\mathrm{nb}^{-1}$ integrated luminosity collected by the ATLAS experiment at the LHC in 2015. The recorded minimum-bias sample is enhanced by triggers for "ultra-central" collisions, providing an opportunity to perform detailed study of flow harmonics in the regime where the initial state is dominated by fluctuations. The anisotropy of the charged-particle azimuthal angle distributions is characterized by the Fourier coefficients, $v_{2}-v_{7}$, which are measured using the two-particle correlation, scalar-product and event-plane methods. The goal of the paper is to provide measurements of the differential as well as integrated flow harmonics $v_{n}$ over wide ranges of the transverse momentum, 0.5 $

456
data tables
match query

The ratio of V2{SP} over V2{EP} as a funtion of transverse momentum in centrality bin 0-5%

The ratio of V2{SP} over V2{EP} as a funtion of transverse momentum in centrality bin 20-30%

The ratio of V2{SP} over V2{EP} as a funtion of transverse momentum in centrality bin 40-50%

The ratio of V3{SP} over V3{EP} as a funtion of transverse momentum in centrality bin 0-5%

The ratio of V3{SP} over V3{EP} as a funtion of transverse momentum in centrality bin 20-30%

The ratio of V3{SP} over V3{EP} as a funtion of transverse momentum in centrality bin 40-50%

The ratio of V4{SP} over V4{EP} as a funtion of transverse momentum in centrality bin 0-5%

The ratio of V4{SP} over V4{EP} as a funtion of transverse momentum in centrality bin 20-30%

The ratio of V4{SP} over V4{EP} as a funtion of transverse momentum in centrality bin 40-50%

The ratio of V5{SP} over V5{EP} as a funtion of transverse momentum in centrality bin 0-5%

The ratio of V5{SP} over V5{EP} as a funtion of transverse momentum in centrality bin 20-30%

The ratio of V5{SP} over V5{EP} as a funtion of transverse momentum in centrality bin 40-50%

The ratio of V6{SP} over V6{EP} as a funtion of transverse momentum in centrality bin 0-5%

The ratio of V6{SP} over V6{EP} as a funtion of transverse momentum in centrality bin 20-30%

The ratio of V6{SP} over V6{EP} as a funtion of transverse momentum in centrality bin 40-50%

The ratio of V2{SP} over V2{EP} as a funtion of MEAN(Npart) integrated over 0.5 < PT < 60 GeV

The ratio of V3{SP} over V3{EP} as a funtion of MEAN(Npart) integrated over 0.5 < PT < 60 GeV

The ratio of V4{SP} over V4{EP} as a funtion of MEAN(Npart) integrated over 0.5 < PT < 60 GeV

The ratio of V5{SP} over V5{EP} as a funtion of MEAN(Npart) integrated over 0.5 < PT < 60 GeV

The ratio of V6{SP} over V6{EP} as a funtion of MEAN(Npart) integrated over 0.5 < PT < 60 GeV

The ratio of V2{SP} over V2{2PC} as a funtion of transverse momentum in centrality bin 0-5%

The ratio of V2{SP} over V2{2PC} as a funtion of transverse momentum in centrality bin 20-30%

The ratio of V2{SP} over V2{2PC} as a funtion of transverse momentum in centrality bin 40-50%

The ratio of V3{SP} over V3{2PC} as a funtion of transverse momentum in centrality bin 0-5%

The ratio of V3{SP} over V3{2PC} as a funtion of transverse momentum in centrality bin 20-30%

The ratio of V3{SP} over V3{2PC} as a funtion of transverse momentum in centrality bin 40-50%

The ratio of V4{SP} over V4{2PC} as a funtion of transverse momentum in centrality bin 0-5%

The ratio of V4{SP} over V4{2PC} as a funtion of transverse momentum in centrality bin 20-30%

The ratio of V4{SP} over V4{2PC} as a funtion of transverse momentum in centrality bin 40-50%

The ratio of V5{SP} over V5{2PC} as a funtion of transverse momentum in centrality bin 0-5%

The ratio of V5{SP} over V5{2PC} as a funtion of transverse momentum in centrality bin 20-30%

The ratio of V5{SP} over V5{2PC} as a funtion of transverse momentum in centrality bin 40-50%

The scaled-V2(PT) measured with the two particle correlation method in centrality bin 0-5%

The scaled-V2(PT) measured with the two particle correlation method in centrality bin 10-15%

The scaled-V2(PT) measured with the two particle correlation method in centrality bin 20-25%

The scaled-V2(PT) measured with the two particle correlation method in centrality bin 30-35%

The scaled-V2(PT) measured with the two particle correlation method in centrality bin 40-45%

The scaled-V2(PT) measured with the two particle correlation method in centrality bin 50-55%

The scaled-V3(PT) measured with the two particle correlation method in centrality bin 0-5%

The scaled-V3(PT) measured with the two particle correlation method in centrality bin 10-15%

The scaled-V3(PT) measured with the two particle correlation method in centrality bin 20-25%

The scaled-V3(PT) measured with the two particle correlation method in centrality bin 30-35%

The scaled-V3(PT) measured with the two particle correlation method in centrality bin 40-45%

The scaled-V3(PT) measured with the two particle correlation method in centrality bin 50-55%

The PT scale factor for V2(PT) as a funtion of collision centrality

The PT scale factor for V3(PT) as a funtion of collision centrality

The V2 scale factor as a funtion of collision centrality

The V3 scale factor as a funtion of collision centrality

Version 5

Searches for electroweak production of supersymmetric particles with compressed mass spectra in $\sqrt{s}=13$ TeV $pp$ collisions with the ATLAS detector
The
ATLAS
collaboration
Aad, Georges
;
Abbott, Brad
;
Abbott, Dale Charles
;
*et al. *

Phys.Rev.D 101 (2020) 052005, 2020.

https://inspirehep.net/literature/1767649
Inspire Record
1767649
DOI
10.17182/hepdata.91374
https://doi.org/10.17182/hepdata.91374
This paper presents results of searches for electroweak production of supersymmetric particles in models with compressed mass spectra. The searches use 139 fb$^{-1}$ of $\sqrt{s}=13$ TeV proton-proton collision data collected by the ATLAS experiment at the Large Hadron Collider. Events with missing transverse momentum and two same-flavor, oppositely charged, low transverse momentum leptons are selected, and are further categorized by the presence of hadronic activity from initial-state radiation or a topology compatible with vector-boson fusion processes. The data are found to be consistent with predictions from the Standard Model. The results are interpreted using simplified models of $R$-parity-conserving supersymmetry in which the lightest supersymmetric partner is a neutralino with a mass similar to the lightest chargino, the second-to-lightest neutralino or the slepton. Lower limits on the masses of charginos in different simplified models range from 193 GeV to 240 GeV for moderate mass splittings, and extend down to mass splittings of 1.5 GeV to 2.4 GeV at the LEP chargino bounds (92.4 GeV). Similar lower limits on degenerate light-flavor sleptons extend up to masses of 251 GeV and down to mass splittings of 550 MeV. Constraints on vector-boson fusion production of electroweak SUSY states are also presented.

459
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match query

Expected 95% CL exclusion sensitivity for simplified models of direct higgsino production.

Expected 95% CL exclusion sensitivity for simplified models of direct higgsino production.

Expected 95% CL exclusion sensitivity for simplified models of direct higgsino production.

Expected 95% CL exclusion sensitivity for simplified models of direct higgsino production.

Expected 95% CL exclusion sensitivity for simplified models of direct higgsino production.

Observed 95% CL exclusion sensitivity for simplified models of direct higgsino production.

Observed 95% CL exclusion sensitivity for simplified models of direct higgsino production.

Observed 95% CL exclusion sensitivity for simplified models of direct higgsino production.

Observed 95% CL exclusion sensitivity for simplified models of direct higgsino production.

Observed 95% CL exclusion sensitivity for simplified models of direct higgsino production.

Expected 95% CL exclusion sensitivity for simplified models of VBF wino-bino production.

Expected 95% CL exclusion sensitivity for simplified models of VBF wino-bino production.

Expected 95% CL exclusion sensitivity for simplified models of VBF wino-bino production.

Expected 95% CL exclusion sensitivity for simplified models of VBF wino-bino production.

Expected 95% CL exclusion sensitivity for simplified models of VBF wino-bino production.

Observed 95% CL exclusion sensitivity for simplified models of direct wino-bino production.

Observed 95% CL exclusion sensitivity for simplified models of direct wino-bino production.

Observed 95% CL exclusion sensitivity for simplified models of direct wino-bino production.

Observed 95% CL exclusion sensitivity for simplified models of direct wino-bino production.

Observed 95% CL exclusion sensitivity for simplified models of direct wino-bino production.

Expected 95% CL exclusion sensitivity for simplified models of direct slepton production.

Expected 95% CL exclusion sensitivity for simplified models of direct slepton production.

Expected 95% CL exclusion sensitivity for simplified models of direct slepton production.

Expected 95% CL exclusion sensitivity for simplified models of direct slepton production.

Expected 95% CL exclusion sensitivity for simplified models of direct slepton production.

Observed 95% CL exclusion sensitivity for simplified models of direct slepton production.

Observed 95% CL exclusion sensitivity for simplified models of direct slepton production.

Observed 95% CL exclusion sensitivity for simplified models of direct slepton production.

Observed 95% CL exclusion sensitivity for simplified models of direct slepton production.

Observed 95% CL exclusion sensitivity for simplified models of direct slepton production.

Expected 95% CL exclusion sensitivity for simplified models of direct LH smuon production.

Expected 95% CL exclusion sensitivity for simplified models of direct LH smuon production.

Expected 95% CL exclusion sensitivity for simplified models of direct smuon production.

Expected 95% CL exclusion sensitivity for simplified models of direct smuon production.

Expected 95% CL exclusion sensitivity for simplified models of direct smuon production.

Observed 95% CL exclusion sensitivity for simplified models of direct LH smuon production.

Observed 95% CL exclusion sensitivity for simplified models of direct LH smuon production.

Observed 95% CL exclusion sensitivity for simplified models of direct smuon production.

Observed 95% CL exclusion sensitivity for simplified models of direct smuon production.

Observed 95% CL exclusion sensitivity for simplified models of direct smuon production.

Expected 95% CL exclusion sensitivity for simplified models of direct RH smuon production.

Expected 95% CL exclusion sensitivity for simplified models of direct RH smuon production.

Expected 95% CL exclusion sensitivity for simplified models of direct selectron production.

Expected 95% CL exclusion sensitivity for simplified models of direct selectron production.

Expected 95% CL exclusion sensitivity for simplified models of direct selectron production.

Observed 95% CL exclusion sensitivity for simplified models of direct RH smuon production.

Observed 95% CL exclusion sensitivity for simplified models of direct RH smuon production.

Observed 95% CL exclusion sensitivity for simplified models of direct selectron production.

Observed 95% CL exclusion sensitivity for simplified models of direct selectron production.

Observed 95% CL exclusion sensitivity for simplified models of direct selectron production.

Expected 95% CL exclusion sensitivity for simplified models of direct LH selectron production.

Expected 95% CL exclusion sensitivity for simplified models of direct LH selectron production.

Expected 95% CL exclusion sensitivity for simplified models of direct LH slepton production.

Expected 95% CL exclusion sensitivity for simplified models of direct LH slepton production.

Expected 95% CL exclusion sensitivity for simplified models of direct LH slepton production.

Observed 95% CL exclusion sensitivity for simplified models of direct LH selectron production.

Observed 95% CL exclusion sensitivity for simplified models of direct LH selectron production.

Observed 95% CL exclusion sensitivity for simplified models of direct LH slepton production.

Observed 95% CL exclusion sensitivity for simplified models of direct LH slepton production.

Observed 95% CL exclusion sensitivity for simplified models of direct LH slepton production.

Expected 95% CL exclusion sensitivity for simplified models of direct RH selectron production.

Expected 95% CL exclusion sensitivity for simplified models of direct RH selectron production.

Expected 95% CL exclusion sensitivity for simplified models of direct RH slepton production.

Expected 95% CL exclusion sensitivity for simplified models of direct RH slepton production.

Expected 95% CL exclusion sensitivity for simplified models of direct RH slepton production.

Observed 95% CL exclusion sensitivity for simplified models of direct RH selectron production.

Observed 95% CL exclusion sensitivity for simplified models of direct RH selectron production.

Observed 95% CL exclusion sensitivity for simplified models of direct RH slepton production.

Observed 95% CL exclusion sensitivity for simplified models of direct RH slepton production.

Observed 95% CL exclusion sensitivity for simplified models of direct RH slepton production.

Expected 95% CL exclusion sensitivity for simplified models of direct LH smuon production.

Expected 95% CL exclusion sensitivity for simplified models of direct LH smuon production.

Expected 95% CL exclusion sensitivity for simplified models of direct LH smuon production.

Observed 95% CL exclusion sensitivity for simplified models of direct LH smuon production.

Observed 95% CL exclusion sensitivity for simplified models of direct LH smuon production.

Observed 95% CL exclusion sensitivity for simplified models of direct LH smuon production.

Expected 95% CL exclusion sensitivity for simplified models of direct RH smuon production.

Expected 95% CL exclusion sensitivity for simplified models of direct RH smuon production.

Expected 95% CL exclusion sensitivity for simplified models of direct RH smuon production.

Observed 95% CL exclusion sensitivity for simplified models of direct RH smuon production.

Observed 95% CL exclusion sensitivity for simplified models of direct RH smuon production.

Observed 95% CL exclusion sensitivity for simplified models of direct RH smuon production.

Expected 95% CL exclusion sensitivity for simplified models of direct LH selectron production.

Expected 95% CL exclusion sensitivity for simplified models of direct LH selectron production.

Expected 95% CL exclusion sensitivity for simplified models of direct LH selectron production.

Observed 95% CL exclusion sensitivity for simplified models of direct LH selectron production.

Observed 95% CL exclusion sensitivity for simplified models of direct LH selectron production.