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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.
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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
This paper describes a strategy for a general search used by the ATLAS Collaboration to find potential indications of new physics. [...]
CERN-EP-2018-070.
- 2018.
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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, 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
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. [...]
CERN-EP-2018-170 ; arXiv:1807.05198.
- 2018.
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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.
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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.
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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.
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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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