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2024-03-19
04:45
Up and Down Quark Structure of the Proton / D0 Collaboration
We measure proton structure parameters sensitive primarily to valence quarks using 8.6 fb$^{-1}$ of data collected by the D0 detector in $\sqrt{s}=1.96$ TeV $p\bar{p}$ collisions at the Fermilab Tevatron. [...]
FERMILAB-PUB-24-0106 ; arXiv:2403.09331.
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2024-03-19
04:42
A Segmented Total Energy Detector (sTED) optimized for $(n,\gamma)$ cross-section measurements at n_TOF EAR2 / n_TOF Collaboration
The neutron time-of-flight facility n_TOF at CERN is a spallation source dedicated to measurements of neutron-induced reaction cross-sections of interest in nuclear technologies, astrophysics, and other applications. [...]
arXiv:2403.09759.
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2024-03-18
15:13
Nonresonant central exclusive production from CMS+TOTEM / Sikler, Ferenc (Budapest, RMKI) /CMS and TOTEM Collaborations
The central exclusive production of charged hadron pairs in pp collisions at a centre-of-mass energy of 13 TeV is examined, based on data collected in a special high-$\beta^*$ run of the LHC. Events are selected by requiring both scattered protons detected in the TOTEM Roman pots, exactly two oppositely charged identified particles in the CMS silicon tracker, and the energy-momentum balance of these four particles. [...]
CMS-CR-2024-051.- Geneva : CERN, 2024 - 8 p. Fulltext: PDF;
In : 23rd Zimanyi School Winter Workshop (Zimanyi 23), Budapest, Hungary, 4 - 8 Dec 2023

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2024-03-18
15:13
Selection of electroweak physics highlights from CMS: measurements of triple and quartic gauge couplings / Szleper, Michal (NCBJ, Swierk) /CMS Collaboration
Run 2 of the LHC has produced a lot of physics results from the electroweak sector of the Standard Model. We briefly overview CMS results that relate to measurements of triple and quartic gauge couplings: diboson, vector boson fusion, vector boson scattering and triboson production. [...]
CMS-CR-2024-049.- Geneva : CERN, 2024 - 11 p. Fulltext: PDF;
In : 30th Cracow Epiphany Conference on on Precision Physics at High Energy Colliders: dedicated to the memory of Staszek Jadach (Epiphany 2024), Cracow, Poland, 8 - 12 Jan 2024

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2024-03-18
10:48
Four tops, SM and BSM by ATLAS and CMS, including EFT interpretations / Bhowmik, Sandeep (Cantabria Inst. of Phys.) /ATLAS and CMS Collaborations
This article presents the observation of four-top-quark ($\rm t\bar{t}t\bar{t}$) production in proton-proton collisions by the ATLAS and CMS experiments at the CERN LHC. The analysis is performed using data samples collected by both experiments separately at a center-of-mass energy of 13 TeV during 2016-2018 and corresponding to an integrated luminosity of 140 $\rm fb^{-1}$ and 138 $\rm fb^{-1}$ by the ATLAS and CMS Collaborations respectively. Events containing two leptons with the same electric charge or at least three leptons (electrons or muons) are selected. Event kinematics are used to separate signal from background through a multivariate discriminant, and dedicated control regions are used to constrain the dominant backgrounds. The observed (expected) significance of the measured $\rm t\bar{t}t\bar{t}$ signal with respect to the standard model (SM) background-only hypothesis is 6.1 (4.3) standard deviations by the ATLAS and 5.6 (4.9) standard deviations by CMS experiment. The $\rm t\bar{t}t\bar{t}$ production cross section is measured to be $\rm 22.5^{+6.6}_{-5.5}$ fb and $\rm 17.7^{+4.4}_{-4.0}$ fb by the ATLAS and CMS experiment respectively, in agreement with the available standard model predictions. Data are also used by the ATLAS experiment to set limits on the three-top-quark production cross section, being an irreducible background not measured previously, and to constrain the top-Higgs Yukawa coupling and effective field theory operator coefficients that affect $\rm t\bar{t}t\bar{t}$ production..
CMS-CR-2024-056.- Geneva : CERN, 2024 - 11 p. Fulltext: PDF;
In : 16th International Conference on Heavy Quarks and leptons , Mumbai, In, 28 Nov - 2 Dec 2023

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2024-03-18
10:48
Correlations between anisotropy flow and mean transverse momentum using subevent cumulants in small systems at CMS / Singh, Rohit Kumar (Indian Inst. Tech., Madras) /CMS Collaboration
A measurement of correlations between mean transverse momentum and multiparticle cumulants in pp at $\sqrt{s} = 13 \, \text{TeV}$, proton-lead (pPb) at $\sqrt{s_{\mathrm{NN}}} = 8.16 \, \text{TeV}$, and peripheral lead-lead (PbPb) collisions at $\sqrt{s_{\mathrm{NN}}} = 5.02 \, \text{TeV}$ are presented for Fourier harmonics $n=2$ and $n=3$. Notably, sign changes in modified Pearson correlators are observed in pp and pPb systems as a function of charged particle multiplicity, but these changes disappear with an increased pseudorapidity gap. [...]
CMS-CR-2024-041.- Geneva : CERN, 2024 - 6 p. Fulltext: PDF;
In : 16th Workshop on Particle Correlations and Femtoscopy (WPCF 2023), Catania, Italy, 6 - 10 Nov 2023

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2024-03-18
08:36
Observation of the $ {\mathrm{J}/\psi} \to\mu^{+}\mu^{-}\mu^{+}\mu^{-} $ decay in proton-proton collisions at $ \sqrt{s} = $ 13 TeV
The $ {\mathrm{J}/\psi} \to\mu^{+}\mu^{-}\mu^{+}\mu^{-} $ decay has been observed with a statistical significance in excess of five standard deviations. [...]
CERN-EP-2024-058 ; CMS-BPH-22-006-003.
- 2024.
Additional information for the analysis - CMS AuthorList - Fulltext

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2024-03-16
04:06
Tracking of charged particles with nanosecond lifetimes at LHCb / LHCb Collaboration
A method is presented to reconstruct charged particles with lifetimes between 10 ps and 10 ns, which considers a combination of their decay products and the partial tracks created by the initial charged particle. [...]
arXiv:2403.09483 ; CERN-EP-2024-077 ; LHCb-DP-2023-004.
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2024-03-16
04:05
Radiative lifetime of the A 2Π1/2 state in RaF with relevance to laser cooling / ISOLDE Collaboration
The radiative lifetime of the $A$$^2 \Pi_{1/2}$ (v=0) state in radium monofluoride (RaF) is measured to be 35(1) ns. [...]
arXiv:2403.09336.
- 8 p.
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2024-03-16
04:02
Exploring Eco-Friendly Gas Mixtures for Resistive Plate Chambers: A Comprehensive Study on Performance and Aging / RPC ECOGas@GIF++ Collaboration
Resistive Plate Chambers (RPCs) are gaseous detectors widely used in high energy physics experiments, operating with a gas mixture primarily containing Tetrafluoroethane (C$_{2}$H$_{2}$F$_{4}$), commonly known as R-134a, which has a global warming potential (GWP) of 1430. [...]
arXiv:2402.19395.
- 5 p.
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