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ATLAS Preprints

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2026-05-20
13:55
New measurements of single top and $\mathrm{t \bar{t}}$ production at ATLAS and CMS / Jeppe, Laurids (CERN) /ATLAS and CMS Collaborations
Recent measurements of single top and $\mathrm{t \bar{t}}$ production at the ATLAS and CMS experiments are summarized. Topics covered are a measurement of $t$-channel single top production at $\sqrt{s} = 5.02\,\mathrm{TeV}$, differential $t$-channel cross sections at $\sqrt{s} = 13\,\mathrm{TeV}$, $\mathrm{WbW\bar{b}}$ differential cross sections in the dilepton and lepton+jets channels probing on- and off-shell top contributions, the most precise inclusive $\mathrm{t \bar{t}}$ cross section measurement to date, the first observation of $\mathrm{t \bar{t}}$ production in PbPb collisions at $\sqrt{s_\mathrm{NN}}} = 5.36\,\mathrm{TeV}$, a combined ATLAS+CMS measurement of the $\mathrm{t \bar{t}}$ spin-correlation observable $\Delta \varphi_{\ell\ell}$, and a characterization of the quantum state of the $\mathrm{t \bar{t}}$ system based on the spin density matrix..
CMS-CR-2026-046.- Geneva : CERN, 2026 - 5 p. Fulltext: PDF;
In : 60th Rencontres de Moriond on QCD and High Energy Interactions, La Thuile, It, 22 - 29 Mar 2026

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2026-05-20
07:46
Search for soft unclustered energy patterns containing muons in the final state in $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector
Soft unclustered energy patterns (SUEPs) refer to high-multiplicity, isotropic distributions of low-momentum particles that could arise in strongly-coupled hidden sector theories. [...]
CERN-EP-2026-148. - 2026
Fulltext - Previous draft version

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2026-05-19
09:05
Measurements of the Higgs boson production, fiducial and differential cross-sections in the four lepton decay channel using 164 fb$^{-1}$ of data collected at $\sqrt{s}$ = 13.6 TeV with the ATLAS detector
Inclusive, differential and production-mode cross-section measurements of the Higgs boson are performed in the $H \to ZZ^{*} \to 4\ell$ decay channel. [...]
CERN-EP-2026-112. - 2026
Fulltext - Previous draft version

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2026-05-18
19:28
Searches for new physics with top quarks in ATLAS and CMS / Iemmi, Fabio (Beijing, Inst. High Energy Phys.) /ATLAS and CMS Collaborations
The latest results by the ATLAS and CMS Collaborations on searches for new physics phenomena involving the production of top quarks are summarized. Both direct searches for new particles and interpretations of Standard Model measurements in terms of the presence of new physics are reported..
CMS-CR-2026-040.- Geneva : CERN, 2026 - 6 p. Fulltext: PDF;
In : 60th Rencontres de Moriond on Electroweak Interactions and Unified Theories, La Thuile, It, 15 - 22 Mar 2026

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2026-05-18
10:17
Observation of a $B_c^{*+}$ meson with the ATLAS detector / ATLAS Collaboration
The first observation of a new meson state decaying into $B_c^+$ and a photon is presented using a dataset of $pp$ collisions at a centre-of-mass energy $\sqrt{s} = 13$ TeV collected by the ATLAS detector at the Large Hadron Collider, corresponding to an integrated luminosity of 140 fb$^{-1}$ [...]
arXiv:2605.16228 ; CERN-EP-2026-142. - 2026 - 32.
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2026-05-14
11:44
Search for charginos and neutralinos with $B-L$ $R$-parity violating decays in $\sqrt{s}=13$ TeV and $13.6$ TeV $pp$ collisions with the ATLAS detector / ATLAS Collaboration
A search is performed for the electroweak pair production of charginos and associated production of a chargino and neutralino, each of which decays through an $R$-parity-violating coupling into a lepton and a $W$, $Z$, or Higgs boson. [...]
arXiv:2605.13819 ; CERN-EP-2026-138. - 2026 - 47.
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2026-05-11
11:38
Track and Vertex Reconstruction with the ATLAS Inner Detector / ATLAS Collaboration
Charged-particle reconstruction is a fundamental part of the event reconstruction in modern multi-purpose high-energy physics detectors. [...]
arXiv:2605.07585 ; CERN-EP-2026-096. - 2026 - 74.
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2026-05-07
09:22
Differential measurements of $\gamma\gamma\to\tau\tau$ and constraints on $\tau$-lepton electromagnetic moments in Pb+Pb collisions at $\sqrt{s_{_\text{NN}}} = 5.02$ TeV with ATLAS / ATLAS Collaboration
This paper presents the first differential fiducial measurements of $\gamma\gamma\to\tau\tau$ using 1.93 nb$^{-1}$ of Pb+Pb data at $\sqrt{s_{_\text{NN}}} = 5.02$ TeV recorded by the ATLAS detector. [...]
arXiv:2605.04584 ; CERN-EP-2026-135. - 2026 - 56.
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2026-05-07
09:09
Study of Particle Fluence Effects on Collected Charge and Depletion Voltage of the ATLAS IBL Planar Pixel Sensors / ATLAS Collaboration
After ten years of operation at the LHC, the planar pixel sensors of the innermost barrel layer of the ATLAS Pixel detector have accumulated an average bulk damage fluence in excess of $2\times10^{15}$ 1 MeV-neutrons equivalent/cm$^2$. [...]
arXiv:2605.05030 ; CERN-EP-2026-129. - 2026 - 40.
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2026-05-05
13:28
Study of $t\bar{t}$ threshold effects in $e\mu$ differential distributions measured in $\sqrt{s}=13$ TeV $pp$ collisions with the ATLAS detector / ATLAS Collaboration
The recent ATLAS measurement of the normalised $e\mu$ dilepton invariant mass and azimuthal angle distributions in $\sqrt{s}=13$ TeV $pp$ collisions at the Large Hadron Collider is extended to study the sensitivity to the formation of quasi-bound states near the $t\bar{t}$ threshold. [...]
arXiv:2605.02341 ; CERN-EP-2026-107. - 2026 - 32.
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