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2023-12-09
08:23
Boundaries of Universal Theories / McCullough, Matthew ; Ricci, Lorenzo ; Riembau, Marc
Universal theories are a broad class of well-motivated microscopic dynamics of the electroweak sector that go beyond the Standard Model description. [...]
CERN-TH-2023-231 ; arXiv:2312.03834. - 15 p.
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2023-12-09
08:19
Triple-GEM detectors for the Phase-2 upgrade of the CMS muon spectrometer / Pellecchia, Antonello
The High-Luminosity LHC will deliver an unprecedented instantaneous luminosity, requiring all experiments to upgrade their detectors to sustain the higher background rates. [...]
arXiv:2312.04165. -
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2023-12-08
04:35
Revisiting the averaged annihilation rate of thermal relics at low temperature / Arbey, A. ; Mahmoudi, F. ; Palmiotto, M.
We derive a low-temperature expansion of the formula to compute the average annihilation rate $\langle \sigma v \rangle$ for dark matter in $\mathbb{Z}_2$-symmetric models, both in the absence and the presence of mass degeneracy in the spectrum near the dark matter candidate. [...]
CERN-TH-2023-232 ; arXiv:2312.03695. -
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2023-12-07
20:10
Inclusive and differential cross-section measurements of $t\bar{t}Z$ production in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector, including EFT and spin-correlation interpretations
Measurements of both the inclusive and differential production cross sections of a top-quark--top-antiquark pair in association with a $Z$ boson ($t\bar{t}Z$) are presented. [...]
CERN-EP-2023-252. - 2023.
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2023-12-07
04:28
Probing supermassive black hole seed scenarios with gravitational wave measurements / Ellis, John ; Fairbairn, Malcolm ; Urrutia, Juan ; Vaskonen, Ville
The process whereby the supermassive black holes populating the centers of galaxies have been assembled remains to be established, with the relative importance of seeds provided by collapsed Population-III stars, black holes formed in nuclear star clusters via repeated mergers, or direct collapses of protogalactic disks yet to be determined. [...]
KCL-PH-TH/2023-69 ; CERN-TH-2023-227 ; arXiv:2312.02983. - 7 p.
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2023-12-06
16:41
Measurement of jet substructure in boosted $t\bar{t}$ events with the ATLAS detector using 140 fb$^{-1}$ of 13 TeV $pp$ collisions / ATLAS Collaboration
Measurements of the substructure of top-quark jets are presented, using 140 fb$^{-1}$ of 13 TeV $pp$ collision data recorded with the ATLAS detector at the LHC. [...]
arXiv:2312.03797 ; CERN-EP-2023-239. - 2023. - 70 p, 70 p.
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2023-12-06
10:06
Search for short- and long-lived axion-like particles in $H\rightarrow a a \rightarrow 4\gamma$ decays with the ATLAS experiment at the LHC / ATLAS Collaboration
Presented is the search for anomalous Higgs boson decays into two axion-like particles (ALPs) using the full Run 2 data set of 140 fb$^{-1}$ of proton-proton collisions at a centre-of-mass energy of 13 TeV recorded by the ATLAS experiment. [...]
arXiv:2312.03306 ; CERN-EP-2023-202. - 2023. - 43 p.
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2023-12-06
09:40
Search for charged-lepton flavor violation in the production and decay of top quarks using trilepton final states in proton-proton collisions at $ \sqrt{s} = $ 13 TeV / CMS Collaboration
A search is performed for charged-lepton flavor violating processes in top quark (t) production and decay. [...]
arXiv:2312.03199 ; CMS-TOP-22-005 ; CERN-EP-2023-258 ; CMS-TOP-22-005-003. - 2023.
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2023-12-06
09:25
Measurement of the Z boson invisible width at $\sqrt{s}=13$ TeV with the ATLAS detector / ATLAS Collaboration
A measurement of the invisible width of the $Z$ boson using events with jets and missing transverse momentum is presented using 37 $\mbox{fb\(^{-1}\)}$ of 13 TeV proton-proton data collected by the ATLAS detector in 2015 and 2016. [...]
arXiv:2312.02789 ; CERN-EP-2023-232. - 2023. - 40 p.
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2023-12-06
04:33
Momentum scale calibration of the LHCb spectrometer / LHCb Collaboration
For accurate determination of particle masses accurate knowledge of the momentum scale of the detectors is crucial. [...]
arXiv:2312.01772 ; CERN-EP-2023-275 ; LHCb-DP-2023-003. - 22 p.
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