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CERN Document Server 451 notices trouvées  1 - 10suivantfin  aller vers la notice: La recherche a duré 0.61 secondes. 
1.
Direct-photon production in inelastic and high-multiplicity proton-proton collisions at $\sqrt{s} =$ 13 TeV / Acharya, Shreyasi (Clermont-Ferrand U.) ; Agarwal, Apar (Calcutta, VECC) ; Aglieri Rinella, Gianluca (CERN) ; Aglietta, Luca (Turin U. ; INFN, Turin) ; Agnello, Michelangelo (Turin Polytechnic) ; Agrawal, Neelima (Bologna U. ; INFN, Bologna) ; Ahammed, Zubayer (Calcutta, VECC) ; Ahmad, Shakeel (Aligarh Muslim U.) ; Ahn, Sang Un (KISTI, Daejeon) ; Ahuja, Ishaan (Kosice U.) et al. /ALICE
In this letter, we present the first measurement of direct photons at the transverse momentum of $ 1 < p_{\rm T} < 6$ GeV/$c$ at midrapidity $|\eta| < 0.8$ in inelastic and high-multiplicity proton-proton collisions at a centre-of-mass energy of $\sqrt{s}$ = 13 TeV. The fraction of virtual direct photons in the inclusive virtual photon spectrum is obtained from a fit to the dielectron invariant mass spectrum. [...]
arXiv:2411.14366; CERN-EP-2024-295.- Geneva : CERN, 2024 - 27 p. Draft (restricted): PDF; Fulltext: PDF;
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2.
Measurement of the inclusive isolated-photon production cross section in pp collisions at $\sqrt{s}$ = 13 TeV / Acharya, Shreyasi (Clermont-Ferrand U.) ; Adamova, Dagmar (Rez, Nucl. Phys. Inst.) ; Agarwal, Apar (Calcutta, VECC) ; Aglieri Rinella, Gianluca (CERN) ; Aglietta, Luca (Turin U. ; INFN, Turin) ; Agnello, Michelangelo (Turin Polytechnic) ; Agrawal, Neelima (Bologna U. ; INFN, Bologna) ; Ahammed, Zubayer (Calcutta, VECC) ; Ahmad, Shakeel (Aligarh Muslim U.) ; Ahn, Sang Un (KISTI, Daejeon) et al.
The production cross section of inclusive isolated photons has been measured by the ALICE experiment at the CERN LHC in pp collisions at centre-of-momentum energy of $\sqrt{s}=13$ TeV collected during the LHC Run 2 data-taking period. The measurement is performed by combining the measurements of the electromagnetic calorimeter EMCal and the central tracking detectors ITS and TPC, covering a pseudorapidity range of $|\eta^{\gamma}|<0.67$ and a transverse momentum range of $7<p_{\rm T}^{\gamma}<200$ GeV/$c$. [...]
arXiv:2407.01165; CERN-EP-2024-171.- Geneva : CERN, 2024 - 33 p. Draft (restricted): PDF; Fulltext: PDF;
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3.
Combination of searches for Higgs boson decays into a photon and a massless dark photon using $pp$ collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector / ATLAS Collaboration
A combination of searches for Higgs boson decaying into a visible photon and a massless dark photon ($H\to\gamma\gamma_{\text{d}}$) is presented using 139 fb$^{-1}$ of proton-proton collision data at a centre-of-mass energy of $\sqrt{s} = 13$ TeV recorded by the ATLAS detector at the Large Hadron Collider. The observed (expected) 95% confidence level upper limit on the Standard Model Higgs boson decay branching ratio is determined to be $\mathcal{B}(H\to\gamma\gamma_{\text{d}}) < $ 1.3 % (1.5) %. [...]
arXiv:2406.01656; CERN-EP-2024-152.- Geneva : CERN, 2024-08-20 - 35 p. - Published in : JHEP 2408 (2024) 153 Fulltext: 2406.01656 - PDF; document - PDF; ANA-EXOT-2023-01-PAPER - PDF; External link: Previous draft version
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4.
Recent results from ultra-peripheral lead-lead collisions with ATLAS / Maj, Klaudia (AGH University of Krakow (PL))
Relativistic heavy-ion beams at the LHC are accompanied by a large flux of equivalent photons, leading to multiple photon-induced processes.\ This report presents a series of measurements of such processes performed by the ATLAS Collaboration. [...]
ATL-PHYS-PROC-2024-037. - 2024.
Original Communication (restricted to ATLAS) - Full text
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5.
Measurement of dilepton production from photon fusion processes in Pb+Pb UPC with the ATLAS detector / Grabowska-Bold, Iwona (AGH University of Krakow (PL))
Relativistic heavy-ion beams at the LHC are accompanied by a large flux of equivalent photons, leading to multiple photon-induced processes. [...]
ATL-PHYS-PROC-2024-023. - 2024.
Original Communication (restricted to ATLAS) - Full text
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6.
Measurements of inclusive and differential cross-sections of $ t\overline{t}\gamma $ production in pp collisions at $ \sqrt{s} $ = 13 TeV with the ATLAS detector / ATLAS Collaboration
Inclusive and differential cross-sections are measured at particle level for the associated production of a top quark pair and a photon ($t\bar{t}\gamma$). The analysis is performed using an integrated luminosity of 140 fb$^{-1}$ of proton-proton collisions at a centre-of-mass energy of 13 TeV collected by the ATLAS detector. [...]
arXiv:2403.09452; CERN-EP-2024-052.- Geneva : CERN, 2024-10-25 - 77 p. - Published in : JHEP 2410 (2024) 191 Fulltext: 2403.09452 - PDF; document - PDF; External link: Previous draft version
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7.
Fiducial and differential cross-section measurements of electroweak $W\gamma jj$ production in pp collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector / ATLAS Collaboration
The observation of the electroweak production of a $W$ boson and a photon in association with two jets, using $pp$ collision data at the Large Hadron Collider at a centre of mass energy of $\sqrt{s}=13$ TeV, is reported. The data were recorded by the ATLAS experiment from 2015 to 2018 and correspond to an integrated luminosity of 140 fb$^{-1}$. [...]
arXiv:2403.02809; CERN-EP-2024-048.- Geneva : CERN, 2024-10-15 - 48 p. - Published in : Eur. Phys. J. C 84 (2024) 1064 Fulltext: 2403.02809 - PDF; document - PDF; External link: Previous draft version
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8.
Investigation of Nanocomposite Scintillators and New Detector Concepts for High Energy Physics / Frank, I (CERN ; Munich U.) ; Cala, R (CERN ; Milan Bicocca U.) ; Kratochwil, N (CERN) ; Martinazzoli, L (CERN ; Milan Bicocca U.) ; Pagano, F (CERN ; Milan Bicocca U.) ; Arora, D (CERN) ; Pizzichemi, M (Milan Bicocca U.) ; Salomoni, M (CERN) ; Doser, M (CERN) ; Hillemanns, E Auffray (CERN)
Particle physics experiments running at future accelerator facilities will rely on fast timing detectors to cope with high event pileup and to enhance particle identification capabilities. Direct band gap engineered semiconductor nanostructures show a high potential for emission of prompt photons due to quantum confinement, standing out in fast timing and high light yield with potential low cost production, thus triggering interest in the high energy physics community. [...]
2023 - 1 p. - Published in : 10.1109/NSSMICRTSD49126.2023.10337902
In : 2023 IEEE Nuclear Science Symposium (NSS), Medical Imaging Conference (MIC) and Room Temperature Semiconductor Detector (RTSD) Conference (2023 IEEE NSS MIC RTSD), Vancouver, Canada, 4 - 11 Nov 2023
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9.
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. The ALPs are assumed to decay into two photons, providing sensitivity to recently proposed models that could explain the $(g-2)_\mu$ discrepancy. [...]
arXiv:2312.03306; CERN-EP-2023-202.- Geneva : CERN, 2024-07-26 - 31 p. - Published in : Eur. Phys. J. C 84 (2024) 742 Fulltext: 2312.03306 - PDF; Publication - PDF; External link: Previous draft version
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10.
Photoproduction of ${\rm K}^{+} {\rm K}^{−}$ Pairs in Ultraperipheral Collisions / ALICE Collaboration
${\rm K}^{+} {\rm K}^{−}$ pairs may be produced in photonuclear collisions, either from the decays of photoproduced $\phi (1020)$ mesons, or directly as non-resonant ${\rm K}^{+} {\rm K}^{−}$ pairs. Measurements of ${\rm K}^{+} {\rm K}^{−}$ photoproduction probe the couplings between the $\phi (1020)$ and charged kaons with photons and nuclear targets. [...]
arXiv:2311.11792; CERN-EP-2023-248.- Geneva : CERN, 2024-05-31 - 13 p. - Published in : Phys. Rev. Lett. 132 (2024) 222303 Draft (restricted): PDF; Fulltext: 2311.11792 - PDF; Publication - PDF;
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