J. A. Aguilar–Saavedra
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View article: A search for high-mass resonances in final states with hadronically decaying tau leptons and high missing transverse momentum using $pp$-collision data at $\sqrt{s} = 13~\text{TeV}$ collected by the ATLAS Detector
A search for high-mass resonances in final states with hadronically decaying tau leptons and high missing transverse momentum using $pp$-collision data at $\sqrt{s} = 13~\text{TeV}$ collected by the ATLAS Detector Open
A search for new heavy charged gauge bosons $W^{\prime}$, predicted by some extensions of the Standard Model is presented in this thesis. This analysis is based on data collected from proton-proton collisions with a center-of-mass-energy o…
View article: Quantum tomography beyond the leading order
Quantum tomography beyond the leading order Open
Quantum tomography, as a tool to probe foundational aspects of quantum mechanics, relies on extracting spin information from angular distributions. This is inherently a leading-order technique, ill-defined when higher-order corrections are…
View article: Quantum information meets high-energy physics: input to the update of the European strategy for particle physics
Quantum information meets high-energy physics: input to the update of the European strategy for particle physics Open
View article: H → ZZ as a double-slit experiment
H → ZZ as a double-slit experiment Open
View article: Erratum to: Search for $$ t\overline{t}H/A\to t\overline{t}t\overline{t} $$ production in the multilepton final state in proton–proton collisions at $$ \sqrt{s} $$ = 13 TeV with the ATLAS detector
Erratum to: Search for $$ t\overline{t}H/A\to t\overline{t}t\overline{t} $$ production in the multilepton final state in proton–proton collisions at $$ \sqrt{s} $$ = 13 TeV with the ATLAS detector Open
Correction to one figure and the corresponding numbers in the text are noted for the paper. A wrong cross-section was used for the theory prediction of t¯tA(→ t¯t), which was estimated to differ by around 1% with respect to the one of t¯tH…
View article: Mass-unspecific classifiers for mass-dependent searches
Mass-unspecific classifiers for mass-dependent searches Open
Searches for new particles often span a wide range of mass scales, where the shape of both potential signals and the SM background varies significantly. We introduce a multivariate method that fully exploits the correlation between signal …
View article: ECFA Higgs, electroweak, and top Factory Study = ECFA Higgs, electroweak, and top factory study
ECFA Higgs, electroweak, and top Factory Study = ECFA Higgs, electroweak, and top factory study Open
The ECFA Higgs, electroweak, and top Factory Study ran between 2021 and 2025 as a broad effort across the experimental and theoretical particle physics communities, bringing together participants from many different proposed future collide…
View article: Measurement of the properties of Higgs boson production at $\\sqrt{s}$ = 13 TeV in the <em>H → γγ</em> channel using 139 fb<sup>-1</sup> of <em>pp</em> collision data with the ATLAS experiment
Measurement of the properties of Higgs boson production at $\\sqrt{s}$ = 13 TeV in the <em>H → γγ</em> channel using 139 fb<sup>-1</sup> of <em>pp</em> collision data with the ATLAS experiment Open
Measurements of Higgs boson production cross-sections are carried out in the diphoton decay channel using 139 fb-1 of pp collision data at $\\sqrt{s}$ = 13 TeV collected by the ATLAS experiment at the LHC. The analysis is based …
View article: 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
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 Open
This paper describes a search for dark photons ($γ_d$) in proton-proton collisions at $\\sqrt{s}$ = 13 TeV at the Large Hadron Collider (LHC). The dark photons are searched for in the decay of Higgs bosons ($H$ → $γγ_d$) produced through t…
View article: Measurements of multijet event isotropies using optimal transport with the ATLAS detector
Measurements of multijet event isotropies using optimal transport with the ATLAS detector Open
A measurement of novel event shapes quantifying the isotropy of collider events is performed in 140 fb-1 of proton-proton collisions with $\\sqrt{s}$ = 13 TeV centre-of-mass energy recorded with the ATLAS detector at CERN’s Larg…
View article: Search for direct production of winos and higgsinos in events with two same-charge leptons or three leptons in $pp$ collision data at $\\sqrt{s}$ = 13 TeV with the ATLAS detector
Search for direct production of winos and higgsinos in events with two same-charge leptons or three leptons in $pp$ collision data at $\\sqrt{s}$ = 13 TeV with the ATLAS detector Open
A search for supersymmetry targeting the direct production of winos and higgsinos is conducted in final states with either two leptons (e or μ) with the same electric charge, or three leptons. The analysis uses 139 fb-1 of pp co…
View article: Measurements of differential cross-sections in top-quark pair events with a high transverse momentum top quark and limits on beyond the Standard Model contributions to top-quark pair production with the ATLAS detector at $ \\sqrt{s} $ = 13 TeV
Measurements of differential cross-sections in top-quark pair events with a high transverse momentum top quark and limits on beyond the Standard Model contributions to top-quark pair production with the ATLAS detector at $ \\sqrt{s} $ = 13 TeV Open
Cross-section measurements of top-quark pair production where the hadronically decaying top quark has transverse momentum greater than 355 GeV and the other top quark decays into ℓνb are presented using 139 fb–1 of data collecte…
View article: Measurement of Higgs boson decay into $b$-quarks in associated production with a top-quark pair in $pp$ collisions at $ \\sqrt{s} $ = 13 TeV with the ATLAS detector
Measurement of Higgs boson decay into $b$-quarks in associated production with a top-quark pair in $pp$ collisions at $ \\sqrt{s} $ = 13 TeV with the ATLAS detector Open
The associated production of a Higgs boson and a top-quark pair is measured in events characterized by the presence of one or two electrons or muons. The Higgs boson decay into a b-quark pair is used. The analyzed data, corresponding to an…
View article: Search for exotic decays of the Higgs boson into long-lived particles in pp collisions at $\\sqrt{s}$ = 13 TeV using displaced vertices in the ATLAS inner detector
Search for exotic decays of the Higgs boson into long-lived particles in pp collisions at $\\sqrt{s}$ = 13 TeV using displaced vertices in the ATLAS inner detector Open
A novel search for exotic decays of the Higgs boson into pairs of long-lived neutral particles, each decaying into a bottom quark pair, is performed using 139 fb-1 of $\\sqrt{s}$ = 13 TeV proton-proton collision data collected w…
View article: Measurement of the polarisation of single top quarks and antiquarks produced in the $t$-channel at $ \\sqrt{s} $ = 13 TeV and bounds on the $tWb$ dipole operator from the ATLAS experiment
Measurement of the polarisation of single top quarks and antiquarks produced in the $t$-channel at $ \\sqrt{s} $ = 13 TeV and bounds on the $tWb$ dipole operator from the ATLAS experiment Open
A simultaneous measurement of the three components of the top-quark and top-antiquark polarisation vectors in t-channel single-top-quark production is presented. This analysis is based on data from proton–proton collisions at a centre-of-m…
View article: Search for exotic decays of the Higgs boson into $b\\bar{b}$ and missing transverse momentum in $pp$ collisions at $\\sqrt{s}$ = 13 TeV with the ATLAS detector
Search for exotic decays of the Higgs boson into $b\\bar{b}$ and missing transverse momentum in $pp$ collisions at $\\sqrt{s}$ = 13 TeV with the ATLAS detector Open
A search for the exotic decay of the Higgs boson (H) into a $b\\bar{b}$ resonance plus missing transverse momentum is described. The search is performed with the ATLAS detector at the Large Hadron Collider using 139 fb-1 of pp c…
View article: Gradient boosting MUST taggers for highly-boosted jets
Gradient boosting MUST taggers for highly-boosted jets Open
The Mass Unspecific Supervised Tagging (MUST) method has proven to be successful in implementing generic jet taggers capable of discriminating various signals over a wide range of jet masses. We implement the MUST concept by using eXtreme …
View article: Toponium hunter’s guide
Toponium hunter’s guide Open
We address the discovery and characterization of toponium production at the Large Hadron Collider. In the dilepton decay mode, multivariate analyses of spin and color observables could provide evidence that an excess of events present near…
View article: Entanglement Autodistillation from Particle Decays
Entanglement Autodistillation from Particle Decays Open
Particle decays do not constitute a spin “measurement” in the quantum-mechanical sense but still modify the spin state, in particular, for an entangled system. We show that for a spin-entangled pair of particles the entanglement of the sys…
View article: Search for leptoquark pair production decaying into $$te^- \bar{t}e^+$$ or $$t\mu ^- \bar{t}\mu ^+$$ in multi-lepton final states in pp collisions at $$\sqrt{s} = 13\,\textrm{TeV}$$ with the ATLAS detector
Search for leptoquark pair production decaying into $$te^- \bar{t}e^+$$ or $$t\mu ^- \bar{t}\mu ^+$$ in multi-lepton final states in pp collisions at $$\sqrt{s} = 13\,\textrm{TeV}$$ with the ATLAS detector Open
View article: Full quantum tomography of top quark decays
Full quantum tomography of top quark decays Open
Quantum tomography in high-energy physics processes has usually been restricted to the spin degrees of freedom. We address the case of top quark decays t→Wb, in which the orbital angular momentum (L) and the spins of W and b are intertwine…
View article: Tripartite entanglement in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>H</mml:mi><mml:mo stretchy="false">→</mml:mo><mml:mi>Z</mml:mi><mml:mi>Z</mml:mi><mml:mo>,</mml:mo><mml:mi>W</mml:mi><mml:mi>W</mml:mi></mml:math> decays
Tripartite entanglement in decays Open
The decays of the Higgs boson produce a state in which the spins of the decay products and the orbital angular momentum (L) are highly entangled. We obtain the tripartite density operator, as well as reduced operators, for the decay into t…
View article: Search for high-mass resonances in final states with a <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>τ</mml:mi></mml:math>-lepton and missing transverse momentum with the ATLAS detector
Search for high-mass resonances in final states with a -lepton and missing transverse momentum with the ATLAS detector Open
A search for high-mass resonances decaying into a τ-lepton and a neutrino using proton-proton collisions at a center-of-mass energy of s=13 TeV is presented. The full run 2 data sample corresponding to an integrated luminosity of 139 fb−…
View article: Closer look at postdecay <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>t</mml:mi><mml:mover accent="true"><mml:mrow><mml:mi>t</mml:mi></mml:mrow><mml:mrow><mml:mo stretchy="false">¯</mml:mo></mml:mrow></mml:mover></mml:mrow></mml:math> entanglement
Closer look at postdecay entanglement Open
Top pair production is ideally suited to observe postdecay entanglement, thus providing a novel test of quantum mechanics. We provide top polarized decay amplitudes that can be used to compute semianalytical predictions and, in particular,…
View article: The ATLAS experiment at the CERN Large Hadron Collider: a description of the detector configuration for Run 3
The ATLAS experiment at the CERN Large Hadron Collider: a description of the detector configuration for Run 3 Open
The ATLAS detector is installed in its experimental cavern at Point 1 of the CERN Large Hadron Collider. During Run 2 of the LHC, a luminosity of ℒ = 2 × 10 34 cm -2 s -1 was routinely achieved at the start of fills, twice the design lumin…
View article: Tripartite entanglement in $H \to ZZ,WW$ decays
Tripartite entanglement in $H \to ZZ,WW$ decays Open
The decays of the Higgs boson produce a state in which the spins of the decay products and the orbital angular momentum ($L$) are highly entangled. We obtain the tripartite density operator, as well as reduced operators, for the decay into…
View article: Deep Generative Models for Fast Photon Shower Simulation in ATLAS
Deep Generative Models for Fast Photon Shower Simulation in ATLAS Open
View article: Search for quantum black hole production in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>lepton</mml:mi><mml:mo>+</mml:mo><mml:mtext>jet</mml:mtext></mml:mrow></mml:math> final states using proton-proton collisions at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msqrt><mml:mi>s</mml:mi></mml:msqrt><mml:mo>=</mml:mo><mml:mn>13</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>TeV</mml:mi></mml:math> with the ATLAS detector
Search for quantum black hole production in final states using proton-proton collisions at with the ATLAS detector Open
A search for quantum black holes in electron+jet and muon+jet invariant mass spectra is performed with 140 fb−1 of data collected by the ATLAS detector in proton-proton collisions at s=13 TeV at the Large Hadron Collider. The observed in…
View article: Study of $$Z \rightarrow ll\gamma $$ decays at $$\sqrt{s}$$ = 8 TeV with the ATLAS detector
Study of $$Z \rightarrow ll\gamma $$ decays at $$\sqrt{s}$$ = 8 TeV with the ATLAS detector Open
This paper presents a study of $$Z \rightarrow ll\gamma $$ decays with the ATLAS detector at the Large Hadron Collider. The analysis uses a proton–proton data sample corresponding to an integrated luminosity of 20.2 fb $$^{-1}$$ …
View article: Full quantum tomography of top quark decays
Full quantum tomography of top quark decays Open
Quantum tomography in high-energy physics processes has usually been restricted to the spin degrees of freedom. We address the case of top quark decays $t \to W b$, in which the orbital angular momentum ($L$) and the spins of $W$ and $b$ a…