Pierre-Hugues Beauchemin

Observation of a cross-section enhancement near the $t\bar{t}$ production threshold in $\sqrt{s}=13$ TeV $pp$ collisions with the ATLAS detector

Georges Aad, Erlend Aakvaag, B M. Acharya, Mariano Apicella et autres

A measurement of $t\bar{t}$ production is presented in the invariant-mass region near the pair production threshold, $m_{t\bar{t}} \sim 345$ GeV, in final states with two charged leptons and multiple jets. The measurement is based on $140\,\mathrm{fb}^{-1}$ of proton-proton collision data collected at …

Combination of ATLAS and CMS searches for Higgs boson pair production at $\sqrt{s} = 13$ TeV

Georges Aad, Erlend Aakvaag, B M. Acharya, Mariano Apicella et autres

International audience

Search for massive, long-lived particles in events with displaced vertices and displaced muons in $pp$ collisions at $\sqrt{s}=13.6$ TeV with the ATLAS experiment

Georges Aad, Erlend Aakvaag, B M. Acharya, Sergio Javier Arbiol Val et autres

A search is presented for massive long-lived particles in events featuring at least one displaced vertex and at least one displaced muon, using proton-proton collision data collected by the ATLAS detector at the Large Hadron Collider from 2022 to 2024 at a …

Search for displaced decays of long-lived particles in events with missing transverse momentum in $ \sqrt{s}=13 $ TeV pp collisions with the ATLAS detector

Georges Aad, Erlend Aakvaag, B M. Acharya, Michaela Arampatzi et autres

A search for long-lived particles in events with significant missing transverse momentum and at least one displaced vertex is presented. This analysis is performed using 137 $\text{fb}^{-1}$ of $pp$ collision data collected between 2016--2018 during Run 2 of the Large Hadron Collider …

Evidence of Higgs boson inclusive production at high transverse momentum decaying to a pair of $b$-quarks with the ATLAS detector

G. Aad, Erlend Aakvaag, B M. Acharya, Sergio Javier Arbiol Val et autres

International audience

Combined effective field theory interpretation of measurements sensitive to quartic gauge boson couplings in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

G. Aad, Erlend Aakvaag, B M. Acharya, Chiara Arcangeletti et autres

A combination of measurements sensitive to anomalous quartic electroweak gauge boson couplings is presented using proton-proton collision data collected by the ATLAS detector at $\sqrt{s} = 13$ TeV at the LHC. Contributing analyses include measurements of vector-boson scattering in numerous final states …

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Search for direct pair production of top squarks in $pp$ collisions at $\sqrt{s}= 13$ TeV and $13.6$ TeV in events with two oppositely charged leptons using the ATLAS detector

G. Aad, Erlend Aakvaag, B M. Acharya, Chiara Arcangeletti et autres

International audience

Combination of measurements of CP properties of Higgs boson interactions with vector bosons using proton-proton collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector

Georges Aad, Erlend Aakvaag, Braden Keim Abbott, Sara Abdelhameed et autres

A combination of measurements of the CP properties of Higgs boson interactions with electroweak gauge bosons is presented, using 140 fb$^{-1}$ of proton-proton collisions at $\sqrt{s} = 13$ TeV recorded by the ATLAS detector. Results from $H\to\tau\tau$, $H\to WW^{*}$, $H\to\gamma\gamma$, $H\to ZZ^{*}$, …

Observation of impact parameter dependent modifications of nuclear parton distributions in photonuclear Pb+Pb collisions at $\sqrt{s_\mathrm{NN}} = 5.02$ TeV with the ATLAS detector

Georges Aad, Erlend Aakvaag, Yiming Abulaiti, Masato Aoki et autres

High-energy photonuclear ($\gamma+A$) scattering in ultra-peripheral heavy-ion collisions provides a unique probe of nuclear structure. This Letter studies the dependence of $\gamma+A$ jet production in ultra-peripheral Pb+Pb collisions at $\sqrt{s_{_\text{NN}}} = 5.02$ TeV on the presence of forward neutron emission from either …

Effective field theory interpretation of ATLAS measurements involving the Higgs boson, electroweak bosons and the top quark

Georges Aad, Erlend Aakvaag, B M. Acharya, Sergio Javier Arbiol Val et autres

International audience

Measurement of jet photoproduction in ultra-peripheral Pb+Pb collisions without nuclear breakup at $\sqrt{s_\mathrm{NN}} = 5.02$ TeV with the ATLAS detector

Georges Aad, Erlend Aakvaag, B M. Acharya, Sergio Javier Arbiol Val et autres

In ultra-relativistic heavy ion collisions at the LHC, each nucleus acts as a source of high-energy quasi-real photons that can participate in scattering processes without causing either participating nucleus to break up and emit forward neutrons. This paper extends recent measurements of …

Search for soft unclustered energy patterns containing muons in the final state in $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector

Georges Aad, Erlend Aakvaag, B M. Acharya, Ayana Tamu Arce et autres

International audience