# Reports

 2022-12-0622:06 [PUBDB-2022-07376] Report Bähr, J. ; Djordjadze, V. ; Lipka, D. ; et al Silica Aerogel Radiators for Bunch Length Measurements [DESY-TESLA-FEL-2004-01] Cherenkov radiators based on silica aerogel are used to measure the electron bunch length at the photo injector test facility at DESY Zeuthen (PITZ). The energy range of those electrons is 4–5 MeV. [...] Restricted: PDF PDF (PDFA); 2022-12-0622:01 [PUBDB-2022-07375] Report Hahn, U. ; Kamps, T. ; Lorenz, R. ; et al Waveguide monitors - a new type of beam position monitors for the TTF FEL [DESY-TESLA-FEL-2003-04] The operation of a Free Electron Laser at the TESLA Test Facility requires the electron trajectory to be aligned with precision of few micrometer in overlap with the photon beam. To achieve this goal precise position monitoring of the electron beam in the narrow undulator gap is mandatory. [...] Restricted: PDF PDF (PDFA); 2022-12-0621:51 [PUBDB-2022-07374] Report Saldin, E. L. ; Schneidmiller, E. A. ; Yurkov, M. V. Longitudinal space charge-driven microbunching instability in the TESLA Test Facility linac [DESY-TESLA-FEL-2003-02] 13 pp. (2004) [10.3204/PUBDB-2022-07374]   In this paper, we study a possible microbunching instability in the TESLA Test Facility linac. A longitudinal space charge is found to be the main effect driving the instability. [...] Fulltext: PDF PDF (PDFA); 2022-12-0621:47 [PUBDB-2022-07373] Report Czarski, T. ; Pozniak, K. T. ; Romaniuk, R. S. ; et al Cavity parameters identification for TESLA control system development [DESY-TESLA-FEL-2005-08] 15 pp. (2005) [10.3204/PUBDB-2022-07373]   Aim of the control system development for TESLA cavity is a more efficient stabilization of the pulsed, accelerating EM field inside resonator. Cavity parameters identification is an essential task for the comprehensive control algorithm. [...] OpenAccess: PDF PDF (PDFA); 2022-12-0611:44 [PUBDB-2022-07358] Report The ATLAS collaboration Projection of H→ττcross-section measurement results to the HL-LHC [ATL-PHYS-PUB-2022-003] 15 pp. (2022)   An extrapolation to assess the expected sensitivity of pp→H→ττcross-section measurements at the HL-LHC is performed using the results obtained with 139 fb−1 of pp collisions at s√=13 TeV. A HL-LHC scenario corresponding to a dataset of 3000 fb−1 of pp collisions at s√=14 TeV is considered. [...] Restricted: PDF PDF (PDFA); 2022-12-0611:38 [PUBDB-2022-07357] Report The ATLAS collaboration Measurement prospects of Higgs boson pair production in the bb¯γγfinal state with the ATLAS experiment at the HL-LHC [ATL-PHYS-PUB-2022-001] 18 pp. (2022)   A prospect study for the search for non-resonant Higgs boson pair production in the bb¯γγdecay channel is presented, assuming 3000 fb−1 of pp collisions at s√=14 TeV with the ATLAS detector at the High Luminosity LHC (HL-LHC). The projected results are based on extrapolations of the Run 2 analysis conducted with 139 fb−1 at s√=13 TeV. [...] Restricted: PDF PDF (PDFA); 2022-12-0611:36 [PUBDB-2022-07356] Report The ATLAS collaboration Expected Size and Readout Rate of the Data of the ATLAS ITk Pixel Detector [ATL-ITK-PUB-2022-001] 34 pp. (2022)   The High-Luminosity LHC (HL-LHC) with its large number of collisions per proton-proton bunch crossing every 25 ns will present a challenging environment for particle detectors. The ATLAS Upgrade Program foresees the complete replacement of the current tracking system with a full-silicon Inner Tracker (ITk) made of a pixel and a strip subdetectors. [...] Restricted: PDF PDF (PDFA); 2022-12-0611:30 [PUBDB-2022-07355] Report ATLAS Collaboration Search for invisible particles produced in association with single top quarks in proton–proton collisions at $\sqrt{s} =13$ TeV with the ATLAS detector [ATLAS-CONF-2022-036] 31 pp. (2022)   A search for events with one top quark and missing transverse momentum in the final state is presented. The fully hadronic decay of the top quark is explored by selecting events with a reconstructed boosted top quark topology produced in association with large missing transverse momentum. [...] Restricted: PDF PDF (PDFA); 2022-12-0611:29 [PUBDB-2022-07354] Report ATLAS Collaboration Observation of an excess of di-charmonium events in the four-muon final state with the ATLAS detector [ATLAS-CONF-2022-040] 14 pp. (2022)   A search for potential $cc\bar{c}\bar{c}$ tetraquarks decaying into a pair of charmonium states in the four muon final state is performed using proton-proton collision data at $\sqrt{s}=13$ TeV, corresponding to an integrated luminosity of 139 fb$^{-1}$ recorded by the ATLAS experiment at the Large Hadron Collider (LHC). Two different decay channels, $T_{cc\bar{c}\bar{c}}\to J/\psi~J/\psi\to 4\mu$ and $T_{cc\bar{c}\bar{c}}\to J/\psi~\psi(2S)\to 4\mu$, are studied. [...] Restricted: PDF PDF (PDFA); 2022-12-0611:22 [PUBDB-2022-07353] Report ATLAS Collaboration Search for leptoquark pair production decaying to $tℓ^-\bar{t}ℓ^+$ in multilepton final states in pp collisions at 13 TeV with the ATLAS detector [ATLAS-CONF-2022-052] 41 pp. (2022)   A search for leptoquark pair production decaying to $t \ell^- \bar{t} \ell^+$ in final states with multiple leptons is presented. The search is based on a dataset of $pp$ collisions at $\sqrt{s}=13$ TeV recorded with the ATLAS detector during Run 2 of the Large Hadron Collider, corresponding to an integrated luminosity of 139 fb$^{-1}$. [...] Restricted: PDF PDF (PDFA);