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ATLAS Papers

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2018-07-20
18:21
Search for charged Higgs bosons decaying via $H^{\pm} \to \tau^{\pm}\nu_{\tau}$ in the $\tau$+jets and $\tau$+lepton final states with 36 fb$^{-1}$ of $pp$ collision data recorded at $\sqrt{s} = 13$ TeV with the ATLAS experiment
Charged Higgs bosons produced either in top-quark decays or in association with a top-quark, subsequently decaying via $H^{\pm} \to \tau^{\pm}\nu_{\tau}$, are searched for in 36.1 fb$^{-1}$ of proton-proton collision data at $\sqrt{s}=13$ TeV recorded with the ATLAS detector. [...]
CERN-EP-2018-148.
- 2018.
Fulltext - Previous draft version

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2018-07-19
16:45
A strategy for a general search for new phenomena using data-derived signal regions and its application within the ATLAS experiment / ATLAS Collaboration
This paper describes a strategy for a general search used by the ATLAS Collaboration to find potential indications of new physics. [...]
arXiv:1807.07447 ; CERN-EP-2018-070.
- 2018. - 62 p, 62 p.
Full text - 00046 Flow diagram for the trigger and offline event selection strategy. The offline requirements are shown on the left of the dashed line and the trigger requirements are shown on the right of the dashed line. - 00033 The number of events in data, and for the different SM background predictions considered, for classes with large \met{}, one muon, one electron and ($b$-)jets (no photons). The classes are labelled according to the multiplicity and type ($e$, $\mu$, $\gamma$, $j$, $b$, $\met$) of the reconstructed objects for the given event class. The hatched bands indicate the total uncertainty of the SM prediction. - 00028 The number of events in data, and for the different SM background predictions considered, for classes with one muon, one electron and ($b$-)jets (no photons or \met{}). The classes are labelled according to the multiplicity and type ($e$, $\mu$, $\gamma$, $j$, $b$, $\met$) of the reconstructed objects for the given event class. The hatched bands indicate the total uncertainty of the SM prediction. - 00048 The number of events in data, and for the different SM background predictions considered, for classes with large \met{} and ($b$-)jets (no leptons or photons). The classes are labelled according to the multiplicity and type ($e$, $\mu$, $\gamma$, $j$, $b$, $\met$) of the reconstructed objects for the given event class. The hatched bands indicate the total uncertainty of the SM prediction. - 00043 The number of events in data, and for the different SM background predictions considered, for classes with at least two leptons, at least one photon and ($b$-)jets (no \met{}). The classes are labelled according to the multiplicity and type ($e$, $\mu$, $\gamma$, $j$, $b$, $\met$) of the reconstructed objects for the given event class. The hatched bands indicate the total uncertainty of the SM prediction. - 00040 The number of events in data, and for the different SM background predictions considered, for classes with one muon and ($b$-)jets (no electrons, photons or \met{}). The classes are labelled according to the multiplicity and type ($e$, $\mu$, $\gamma$, $j$, $b$, $\met$) of the reconstructed objects for the given event class. The hatched bands indicate the total uncertainty of the SM prediction. - 00025 : - 00037 The number of events in data, and for the different SM background predictions considered, for classes with one electron and ($b$-)jets (no muons, photons or \met{}). The classes are labelled according to the multiplicity and type ($e$, $\mu$, $\gamma$, $j$, $b$, $\met$) of the reconstructed objects for the given event class. The hatched bands indicate the total uncertainty of the SM prediction. - 00035 The number of events in data, and for the different SM background predictions considered, for classes with at least one photon and ($b$-)jets (no leptons or \met{}). The classes are labelled according to the multiplicity and type ($e$, $\mu$, $\gamma$, $j$, $b$, $\met$) of the reconstructed objects for the given event class. In event classes with four or more data events, the $\gamma+\text{jets}$ and $\gamma\gamma+\text{jets}$ MC samples are scaled to data in the single-photon and diphoton event classes respectively. The hatched bands indicate the total uncertainty of the SM prediction. - 00036 The number of events in data, and for the different SM background predictions considered, for classes with one lepton, at least one photon and ($b$-)jets (no \met{}). The classes are labelled according to the multiplicity and type ($e$, $\mu$, $\gamma$, $j$, $b$, $\met$) of the reconstructed objects for the given event class. The hatched bands indicate the total uncertainty of the SM prediction. - 00026 : The fraction of pseudo-experiments which have at least one, two and three \pchannel-values below a given $p_{\text{min}}$, given for both the pseudo-experiments generated from the nominal SM expectation and tested against the nominal expectation (dashed) and for those tested against the modified expectation (`SM, $t\bar{t}\gamma$ removed') in which the $t\bar{t}\gamma$ process is removed (solid). The \minv{} scan is shown in (a) and the \meff{} scan in (b). The scan results of the data tested against the modified background prediction are indicated with solid arrows. For reference the scan results under the SM hypothesis are plotted as dashed arrows. The largest deviation after removing the $t\bar{t}\gamma$ process from the background expectation is found in the \meff{} distribution of the $1e1\gamma1b2j$ event class. The distributions of the data and the expectation with both $t\bar{t}\gamma$ included and $t\bar{t}\gamma$ removed are shown in (c) and (d) respectively. : Caption not extracted - 00044 The number of events in data, and for the different SM background predictions considered, for classes with two same-flavour leptons and ($b$-)jets (no photons or \met{}). The classes are labelled according to the multiplicity and type ($e$, $\mu$, $\gamma$, $j$, $b$, $\met$) of the reconstructed objects for the given event class. The hatched bands indicate the total uncertainty of the SM prediction. - 00027 : The fraction of pseudo-experiments which have at least one, two and three \pchannel-values below a given $p_{\min}$, given for both the pseudo-experiments generated from the nominal SM expectation and tested against the nominal expectation (dashed) and for those tested against the modified expectation (`SM, $WZ$ removed') in which the $WZ$ diboson process is removed (solid). The \minv{} scan is shown in (a) and the \meff{} scan in (b). The scan results of the data tested against the modified background prediction are indicated with solid arrows. For reference the scan results under the SM hypothesis are plotted as dashed arrows. The largest deviation after removing the $WZ$ process from the background expectation is found in the \meff{} distribution of the $3\mu$ event class. The distributions of the data and the expectation with both $WZ$ included and $WZ$ removed are shown in (c) and (d) respectively. : Caption not extracted - 00039 The number of events in data, and for the different SM background predictions considered, for classes with three or four leptons and ($b$-)jets (no photons or \met{}). The classes are labelled according to the multiplicity and type ($e$, $\mu$, $\gamma$, $j$, $b$, $\met$) of the reconstructed objects for the given event class. The hatched bands indicate the total uncertainty of the SM prediction. - 00031 The number of events in data, and for the different SM background predictions considered, for classes with large \met{}, at least one photon, leptons and ($b$-)jets. The classes are labelled according to the multiplicity and type ($e$, $\mu$, $\gamma$, $j$, $b$, $\met$) of the reconstructed objects for the given event class. The hatched bands indicate the total uncertainty of the SM prediction. - 00032 The number of events in data, and for the different SM background predictions considered, for classes with ($b$-)jets (no \met{}, leptons or photons). The classes are labelled according to the multiplicity and type ($e$, $\mu$, $\gamma$, $j$, $b$, $\met$) of the reconstructed objects for the given event class. In event classes with four or more data events, the multijet MC sample is scaled to data. The hatched bands indicate the total uncertainty of the SM prediction. - 00034 : Caption not extracted - 00041 The number of events in data, and for the different SM background predictions considered, for classes with large \met{}, one lepton and ($b$-)jets (no photons). The classes are labelled according to the multiplicity and type ($e$, $\mu$, $\gamma$, $j$, $b$, $\met$) of the reconstructed objects for the given event class. The hatched bands indicate the total uncertainty of the SM prediction. This figure shows 60 out of 704 event classes, the remaining event classes can be found in \Figrange{\ref{fig:global2}}{\ref{fig:global14}} of \App{\ref{appendixA3}}. - 00038 The number of events in data, and for the different SM background predictions considered, for classes with large \met{}, at least one pair of same flavour leptons and ($b$-)jets (no photons). The classes are labelled according to the multiplicity and type ($e$, $\mu$, $\gamma$, $j$, $b$, $\met$) of the reconstructed objects for the given event class. The hatched bands indicate the total uncertainty of the SM prediction. - 00029 : Caption not extracted - 00030 : : Example distributions showing the region of interest (ROI), i.e.\ the region with the smallest \pvalue-value, between the vertical dashed lines. (a) $\met{} 1\gamma 3j$ channel, which has the largest deviation in the \minv{} scan. (b) $1\mu 1e 4b 2j$ channel, which has the largest deviation in the \meff{} scan. (c) An upward fluctuation in the \minv{} distribution of the $1e 1\gamma 2b 2j$ channel. (d) A downward fluctuation in the \meff{} distribution of the $6j$ channel. (e) A downward fluctuation in the \minv{} distribution of the $\met{} 2\mu 1j$ channel. (f) An upward fluctuation in the \meff{} distribution of the $\met 3j$ channel. The hatched band includes all systematic and statistical uncertainties from MC simulations. In the ratio plots the inner solid uncertainty band shows the statistical uncertainty from MC simulations, the middle solid band includes the experimental systematic uncertainty, and the hatched band includes the theoretical systematic uncertainty. - 00049 : Caption not extracted - 00047 : - 00045 : Caption not extracted - 00042 : - Fulltext - Fulltext

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2018-07-17
17:40
Search for lepton-flavor violation in different-flavor, high-mass final states in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector / ATLAS Collaboration
A search is performed for a heavy particle decaying into different-flavor, dilepton pairs ($e\mu$, $e\tau$ or $\mu\tau$), using 36.1 fb$^{-1}$ of proton-proton collision data at $\sqrt{s}=13$ TeV collected in 2015-2016 by the ATLAS detector at the Large Hadron Collider. [...]
arXiv:1807.06573 ; CERN-EP-2018-137.
- 2018. - 49 p.
00056 : Caption not extracted - 00037 : Caption not extracted - Fulltext - 00038 : - 00041 : - 00042 : - 00040 : - 00046 : Caption not extracted - 00033 : Caption not extracted - 00039 : Caption not extracted - 00036 : Caption not extracted - 00030 : - 00029 : - 00048 : - 00047 : - 00052 : - 00050 : - 00053 : The observed and expected 95\% credibility-level upper limits on the (a) \Zprime~boson, (b) $\tau$-sneutrino ($\tilde{\nu}_{\tau}$), and (c) QBH ADD and RS production cross-section times branching ratio for decays into an $\mu\tau$ final state. The signal theoretical cross-section times branching ratio lines for the \Zprime~model, the QBH ADD model assuming six extra dimensions, and the RS model with one extra dimension are obtained from the simulation of each process, while the RPV SUSY $\tilde{\nu}_{\tau}$ includes the NLO $K$-factor calculated using LoopTools \cite{bib:LoopTools}. The acceptance times efficiency of the ADD and RS QBH models agree within 1\%, and the same curve is used for limit extraction. The expected limits are shown with the $\pm 1$ and $\pm 2$ standard deviation uncertainty bands. - 00044 : The observed and expected 95\% credibility-level upper limits on the (a) \Zprime~boson, (b) $\tau$-sneutrino ($\tilde{\nu}_{\tau}$), and (c) QBH ADD and RS production cross-section times branching ratio for decays into an $e\tau$ final state. The signal theoretical cross-section times branching ratio lines for the \Zprime~model, the QBH ADD model assuming six extra dimensions, and the RS model with one extra dimension are obtained from the simulation of each process, while the RPV SUSY $\tilde{\nu}_{\tau}$ includes the NLO $K$-factor calculated using LoopTools \cite{bib:LoopTools}. The acceptance times efficiency of the ADD and RS QBH models agree within 1\%, and the same curve is used for limit extraction. The expected limits are shown with the $\pm 1$ and $\pm 2$ standard deviation uncertainty bands. - 00043 : Caption not extracted - 00054 : Caption not extracted - 00051 : Caption not extracted - 00049 : Caption not extracted - 00035 : - 00032 : - 00034 : - 00031 : Caption not extracted - 00045 : The observed and expected 95\% credibility-level upper limits on the (a) \Zprime~boson, (b) $\tau$-sneutrino ($\tilde{\nu}_{\tau}$), and (c) QBH ADD and RS production cross-section times branching ratio for decays into an $e\mu$ final state with and without the $b$-veto requirement. The signal theoretical cross-section times branching ratio lines for the \Zprime~model, the QBH ADD model assuming six extra dimensions, and the RS model with one extra dimension are obtained from the simulation of each process, while the RPV SUSY $\tilde{\nu}_{\tau}$ includes the NLO $K$-factor calculated using LoopTools \cite{bib:LoopTools}. The acceptance times efficiency of the ADD and RS QBH models agree within 1\%, and the same curve is used for limit extraction. The expected limits are shown with the $\pm 1$ and $\pm 2$ standard deviation uncertainty bands on the results with the $b$-veto requirement. - 00055 : Caption not extracted - 00057 : Caption not extracted - Fulltext - Fulltext

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2018-07-14
01:10
Prompt and non-prompt $J/\psi$ elliptic flow in Pb+Pb collisions at $\sqrt{s_{_\text{NN}}} = 5.02$ TeV with the ATLAS detector / ATLAS Collaboration
The elliptic flow of prompt and non-prompt $J/\psi$ was measured in the dimuon decay channel in Pb+Pb collisions at $\sqrt{s_{_\text{NN}}}=5.02$ TeV with an integrated luminosity of $0.42~\mathrm{nb}^{-1}$ with the ATLAS detector at the LHC. [...]
arXiv:1807.05198 ; CERN-EP-2018-170 ; CERN-EP-2018-170.
- 2018. - 34 p, 34 p.
Full text - 00013 Prompt (left) and non-prompt (right) \jpsi $v_2$ as a function of rapidity for transverse momentum in the range $9 < \pT < 30~\GeV$ and centrality 0--60\%. The statistical and systematic uncertainties are shown using vertical error bars and boxes respectively. The horizontal error bars represent the kinematic range of the measurement for each bin. - 00017 Prompt (left) and non-prompt (right) \jpsi $v_2$ as a function of rapidity for transverse momentum in the range $9 < \pT < 30~\GeV$ and centrality 0--60\%. The statistical and systematic uncertainties are shown using vertical error bars and boxes respectively. The horizontal error bars represent the kinematic range of the measurement for each bin. - 00012 Prompt (left) and non-prompt (right) \jpsi $v_2$ as a function of average number of nucleons participating in the collision for transverse momentum in the range $9 < \pT < 30~\GeV$ and rapidity $|y| < 2$. The statistical and systematic uncertainties are shown using vertical error bars and boxes respectively. The centrality interval associated to a given value of \avgNpart is written below each data point. - 00022 Prompt (left) and non-prompt (right) \jpsi $v_2$ as a function of average number of nucleons participating in the collision for transverse momentum in the range $9 < \pT < 30~\GeV$ and rapidity $|y| < 2$. The statistical and systematic uncertainties are shown using vertical error bars and boxes respectively. The centrality interval associated to a given value of \avgNpart is written below each data point. - 00016 Prompt (left) and non-prompt (right) \jpsi $v_2$ as a function of average number of nucleons participating in the collision for transverse momentum in the range $9 < \pT < 30~\GeV$ and rapidity $|y| < 2$. The statistical and systematic uncertainties are shown using vertical error bars and boxes respectively. The centrality interval associated to a given value of \avgNpart is written below each data point. - 00015 Prompt (left) and non-prompt (right) \jpsi $v_2$ as a function of average number of nucleons participating in the collision for transverse momentum in the range $9 < \pT < 30~\GeV$ and rapidity $|y| < 2$. The statistical and systematic uncertainties are shown using vertical error bars and boxes respectively. The centrality interval associated to a given value of \avgNpart is written below each data point. - 00012 Prompt (left) and non-prompt (right) \jpsi $v_2$ as a function of average number of nucleons participating in the collision for transverse momentum in the range $9 < \pT < 30~\GeV$ and rapidity $|y| < 2$. The statistical and systematic uncertainties are shown using vertical error bars and boxes respectively. The centrality interval associated to a given value of \avgNpart is written below each data point. - 00019 The azimuthal distribution of prompt (left) and non-prompt (right) \jpsi yields for the lowest \pT bin studied. The yields are normalised by the inclusive \jpsi signal and the error bars are fit uncertainties associated with the signal extraction. The dotted red line is the result of the simultaneous fit used to compute $v_2$. - 00015 The azimuthal distribution of prompt (left) and non-prompt (right) \jpsi yields for the lowest \pT bin studied. The yields are normalised by the inclusive \jpsi signal and the error bars are fit uncertainties associated with the signal extraction. The dotted red line is the result of the simultaneous fit used to compute $v_2$. - 00016 The azimuthal distribution of prompt (left) and non-prompt (right) \jpsi yields for the lowest \pT bin studied. The yields are normalised by the inclusive \jpsi signal and the error bars are fit uncertainties associated with the signal extraction. The dotted red line is the result of the simultaneous fit used to compute $v_2$. - 00020 The azimuthal distribution of prompt (left) and non-prompt (right) \jpsi yields for the lowest \pT bin studied. The yields are normalised by the inclusive \jpsi signal and the error bars are fit uncertainties associated with the signal extraction. The dotted red line is the result of the simultaneous fit used to compute $v_2$. - 00023 Results of the error analysis for the fitted values of the prompt and non-prompt \jpsi $v_2$. The contour lines correspond to the $n\sigma$ fit uncertainties. For this bin, prompt \jpsi $v_2$ has a significance of $3\sigma$ and non-prompt \jpsi has a significance of $1\sigma$. - 00022 Results of the error analysis for the fitted values of the prompt and non-prompt \jpsi $v_2$. The contour lines correspond to the $n\sigma$ fit uncertainties. For this bin, prompt \jpsi $v_2$ has a significance of $3\sigma$ and non-prompt \jpsi has a significance of $1\sigma$. - 00015 Results for $v_2$ as a function of the transverse momentum of prompt \jpsi as measured by ATLAS in this analysis compared with inclusive \jpsi with $\pT < 12~\GeV$ as measured by ALICE at $5.02~\TeV$~\cite{ALICE2017}, and prompt \jpsi with \pT in the range $4 < \pT < 30~\GeV$ by CMS at $2.76~\TeV$~\cite{CMS2017}. The statistical and systematic uncertainties are shown using vertical error bars and boxes respectively. - 00012 Results for $v_2$ as a function of the transverse momentum of prompt \jpsi as measured by ATLAS in this analysis compared with inclusive \jpsi with $\pT < 12~\GeV$ as measured by ALICE at $5.02~\TeV$~\cite{ALICE2017}, and prompt \jpsi with \pT in the range $4 < \pT < 30~\GeV$ by CMS at $2.76~\TeV$~\cite{CMS2017}. The statistical and systematic uncertainties are shown using vertical error bars and boxes respectively. - 00023 Results for $v_2$ as a function of the transverse momentum of prompt \jpsi as measured by ATLAS in this analysis compared with inclusive \jpsi with $\pT < 12~\GeV$ as measured by ALICE at $5.02~\TeV$~\cite{ALICE2017}, and prompt \jpsi with \pT in the range $4 < \pT < 30~\GeV$ by CMS at $2.76~\TeV$~\cite{CMS2017}. The statistical and systematic uncertainties are shown using vertical error bars and boxes respectively. - 00017 Prompt (left) and non-prompt (right) \jpsi $v_2$ as a function of transverse momentum for the rapidity interval $|y| &lt; 2$ and centrality 0--60\%. The statistical and systematic uncertainties are shown using vertical error bars and boxes respectively. The horizontal error bars represent the kinematic range of the measurement for each bin. - 00018 Prompt (left) and non-prompt (right) \jpsi $v_2$ as a function of transverse momentum for the rapidity interval $|y| &lt; 2$ and centrality 0--60\%. The statistical and systematic uncertainties are shown using vertical error bars and boxes respectively. The horizontal error bars represent the kinematic range of the measurement for each bin. - 00020 Prompt (left) and non-prompt (right) \jpsi $v_2$ as a function of rapidity for transverse momentum in the range $9 &lt; \pT &lt; 30~\GeV$ and centrality 0--60\%. The statistical and systematic uncertainties are shown using vertical error bars and boxes respectively. The horizontal error bars represent the kinematic range of the measurement for each bin. - 00021 Prompt (left) and non-prompt (right) \jpsi $v_2$ as a function of average number of nucleons participating in the collision for transverse momentum in the range $9 &lt; \pT &lt; 30~\GeV$ and rapidity $|y| &lt; 2$. The statistical and systematic uncertainties are shown using vertical error bars and boxes respectively. The centrality interval associated to a given value of \avgNpart is written below each data point. - 00022 Prompt (left) and non-prompt (right) \jpsi $v_2$ as a function of average number of nucleons participating in the collision for transverse momentum in the range $9 &lt; \pT &lt; 30~\GeV$ and rapidity $|y| &lt; 2$. The statistical and systematic uncertainties are shown using vertical error bars and boxes respectively. The centrality interval associated to a given value of \avgNpart is written below each data point. - 00014 Fit projections of the two-dimensional invariant mass ($m_{\mu\mu}$) and pseudo-proper decay time ($\tau_{\mu\mu}$) for the signal extraction for the azimuthal bin $0 < 2|\phi-\Psi_2| < \pi/4$ in the kinematic range $9 < \pT < 11~\GeV$, $0<|y|<2$ and 0--60\% centrality. - 00021 Fit projections of the two-dimensional invariant mass ($m_{\mu\mu}$) and pseudo-proper decay time ($\tau_{\mu\mu}$) for the signal extraction for the azimuthal bin $0 < 2|\phi-\Psi_2| < \pi/4$ in the kinematic range $9 < \pT < 11~\GeV$, $0<|y|<2$ and 0--60\% centrality. - 00014 Fit projections of the two-dimensional invariant mass ($m_{\mu\mu}$) and pseudo-proper decay time ($\tau_{\mu\mu}$) for the signal extraction for the azimuthal bin $0 < 2|\phi-\Psi_2| < \pi/4$ in the kinematic range $9 < \pT < 11~\GeV$, $0<|y|<2$ and 0--60\% centrality. - 00023 Results for $v_2$ as a function of the transverse momentum of prompt \jpsi as measured by ATLAS in this analysis compared with inclusive \jpsi with $\pT &lt; 12~\GeV$ as measured by ALICE at $5.02~\TeV$~\cite{ALICE2017}, and prompt \jpsi with \pT in the range $4 &lt; \pT &lt; 30~\GeV$ by CMS at $2.76~\TeV$~\cite{CMS2017}. The statistical and systematic uncertainties are shown using vertical error bars and boxes respectively. - 00020 Fit projections of the two-dimensional invariant mass ($m_{\mu\mu}$) and pseudo-proper decay time ($\tau_{\mu\mu}$) for the signal extraction for the azimuthal bin $0 < 2|\phi-\Psi_2| < \pi/4$ in the kinematic range $9 < \pT < 11~\GeV$, $0<|y|<2$ and 0--60\% centrality. - 00018 Fit projections of the two-dimensional invariant mass ($m_{\mu\mu}$) and pseudo-proper decay time ($\tau_{\mu\mu}$) for the signal extraction for the azimuthal bin $0 < 2|\phi-\Psi_2| < \pi/4$ in the kinematic range $9 < \pT < 11~\GeV$, $0<|y|<2$ and 0--60\% centrality. - Fulltext - Fulltext - 00016 Results of the error analysis for the fitted values of the prompt and non-prompt \jpsi $v_2$. The contour lines correspond to the $n\sigma$ fit uncertainties. For this bin, prompt \jpsi $v_2$ has a significance of $3\sigma$ and non-prompt \jpsi has a significance of $1\sigma$. - 00013 Prompt (left) and non-prompt (right) \jpsi $v_2$ as a function of transverse momentum for the rapidity interval $|y| < 2$ and centrality 0--60\%. The statistical and systematic uncertainties are shown using vertical error bars and boxes respectively. The horizontal error bars represent the kinematic range of the measurement for each bin. - 00017 Prompt (left) and non-prompt (right) \jpsi $v_2$ as a function of transverse momentum for the rapidity interval $|y| < 2$ and centrality 0--60\%. The statistical and systematic uncertainties are shown using vertical error bars and boxes respectively. The horizontal error bars represent the kinematic range of the measurement for each bin. - 00021 Prompt (left) and non-prompt (right) \jpsi $v_2$ as a function of transverse momentum for the rapidity interval $|y| < 2$ and centrality 0--60\%. The statistical and systematic uncertainties are shown using vertical error bars and boxes respectively. The horizontal error bars represent the kinematic range of the measurement for each bin. - 00019 Prompt (left) and non-prompt (right) \jpsi $v_2$ as a function of transverse momentum for the rapidity interval $|y| < 2$ and centrality 0--60\%. The statistical and systematic uncertainties are shown using vertical error bars and boxes respectively. The horizontal error bars represent the kinematic range of the measurement for each bin. - 00014 Prompt (left) and non-prompt (right) \jpsi $v_2$ as a function of transverse momentum for the rapidity interval $|y| < 2$ and centrality 0--60\%. The statistical and systematic uncertainties are shown using vertical error bars and boxes respectively. The horizontal error bars represent the kinematic range of the measurement for each bin. - 00019 Prompt (left) and non-prompt (right) \jpsi $v_2$ as a function of transverse momentum for the rapidity interval $|y| < 2$ and centrality 0--60\%. The statistical and systematic uncertainties are shown using vertical error bars and boxes respectively. The horizontal error bars represent the kinematic range of the measurement for each bin. - 00018 Prompt (left) and non-prompt (right) \jpsi $v_2$ as a function of rapidity for transverse momentum in the range $9 < \pT < 30~\GeV$ and centrality 0--60\%. The statistical and systematic uncertainties are shown using vertical error bars and boxes respectively. The horizontal error bars represent the kinematic range of the measurement for each bin. - 00013 Prompt (left) and non-prompt (right) \jpsi $v_2$ as a function of rapidity for transverse momentum in the range $9 < \pT < 30~\GeV$ and centrality 0--60\%. The statistical and systematic uncertainties are shown using vertical error bars and boxes respectively. The horizontal error bars represent the kinematic range of the measurement for each bin. - Fulltext - Fulltext

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2018-07-13
14:53
Search for Higgs boson pair production in the $\gamma\gamma b\bar{b}$ final state with 13 TeV $pp$ collision data collected by the ATLAS experiment / ATLAS Collaboration
A search is performed for resonant and non-resonant Higgs boson pair production in the $\gamma\gamma b\bar{b}$ final state. [...]
arXiv:1807.04873 ; CERN-EP-2018-130.
- 2018. - 42 p.
Full text - 00012 : - 00015 : - 00022 : Caption not extracted - 00020 : - 00018 : - 00014 : - 00021 : - 00017 : Leading-order production modes for Higgs boson pairs. In the SM, there is destructive interference between (a) the heavy-quark loop and (b) the Higgs self-coupling production modes, which reduces the overall \xs. BSM Higgs boson pair production could proceed through changes to the Higgs couplings, for example the \ttH or $HHH$ couplings which contribute to (a) and (b), or through an intermediate resonance, $X$, which could, for example, be produced through a quark loop as shown in (c). - 00013 The expected and observed 95\% CL limits on the resonant production \xs, $\xsX \times \mathcal{B}\left(X \rightarrow \hh\right)$ as a function of \mX. The loose selection is used for $\mX \leq 500\GeV$, while the tight selection is used for $\mX \geq 500\GeV$. This is delineated with the blue dashed line. - 00016 : - 00023 : The expected and observed 95\% CL limits on the non-resonant production \xs \xsHH (a) for the SM-optimised limit using the tight selection and (b) as a function of $\kappa_\lambda$ using the loose selection. In (a) the red line indicates the 95\% confidence level. The intersection of this line with the observed, expected, and $\pm1\sigma$ and $\pm2\sigma$ bands is the location of the limits. In (b) the red line indicates the predicted \hh \xs if \khhh is varied but all other couplings remain at their SM values. The red band indicates the theoretical uncertainty of this prediction. - 00019 : Caption not extracted - Fulltext - Fulltext

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2018-07-06
02:22
Correlated long-range mixed-harmonic fluctuations measured in $pp$, $p$+Pb and low-multiplicity Pb+Pb collisions with the ATLAS detector
Correlations of two flow harmonics $v_n$ and $v_m$ via three- and four-particle cumulants are measured in 13 TeV $pp$, 5.02 TeV $p$+Pb, and 2.76 TeV peripheral Pb+Pb collisions with the ATLAS detector at the LHC. [...]
CERN-EP-2018-151.
- 2018.
Fulltext - Previous draft version

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2018-07-02
16:58
Searches for exclusive Higgs and $Z$ boson decays into $J/\psi\gamma$, $\psi(2S)\gamma$, and $\Upsilon(nS)\gamma$ at $\sqrt{s}=13$ TeV with the ATLAS detector / ATLAS Collaboration
Searches for the exclusive decays of the Higgs and $Z$ bosons into a $J/\psi$, $\psi(2S)$, or $\Upsilon(nS)$ ($n=1,2,3$) meson and a photon are performed with a $pp$ collision data sample corresponding to an integrated luminosity of 36.1 $fb^{-1}$ collected at $\sqrt{s}=13$ TeV with the ATLAS detector at the CERN Large Hadron Collider. [...]
CERN-EP-2018-154 ; CERN-EP-2018-154 ; arXiv:1807.00802.
- 2018. - 37 p.
Fulltext - Previous draft version - Full text

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2018-07-02
11:12
Search for Higgs boson decays into a pair of light bosons in the $bb\mu\mu$ final state in $pp$ collision at $\sqrt{s} = $13 TeV with the ATLAS detector / ATLAS Collaboration
A search for decays of the Higgs boson into a pair of new spin-zero particles, $H \to aa$, where the $a$-bosons decay into a $b$-quark pair and muon pair, is presented. [...]
CERN-EP-2018-153 ; CERN-EP-2018-153 ; arXiv:1807.00539.
- 2018. - 36 p.
Fulltext - Previous draft version - Full text

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2018-06-27
22:48
Search for pair- and single-production of vector-like quarks in final states with at least one $Z$ boson decaying into a pair of electrons or muons in $pp$ collision data collected with the ATLAS detector at $\sqrt{s} = 13$ TeV / ATLAS Collaboration
A search for vector-like quarks is presented, which targets their decay into a $Z$ boson and a third-generation Standard Model quark. [...]
CERN-EP-2018-145 ; arXiv:1806.10555 ; CERN-EP-2018-145.
- 2018. - 74 p.
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2018-06-22
17:10
Observation of centrality-dependent acoplanarity for muon pairs produced via two-photon scattering in Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV with the ATLAS detector / ATLAS Collaboration
This Letter presents a measurement of $\gamma \gamma \rightarrow \mu^{+} \mu^{-}$ production in Pb+Pb collisions recorded by the ATLAS detector at the Large Hadron Collider at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV with an integrated luminosity of 0.49 nb$^{-1}$. [...]
CERN-EP-2018-100 ; CERN-EP-2018-100 ; arXiv:1806.08708.
- 2018. - 29 p.
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