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2021-05-11
06:01
Real-time selection using flavour-tagging algorithms in ATLAS / Varni, C (INFN, Genoa ; Genoa U.) /ATLAS Collaboration
The physics program covered by the ATLAS Collaboration is broad and also includes final states characterized by the presence of $b$-hadrons in their final states. Specialized triggers that exploit flavour tagging techniques, the $b$-jet triggers, have been developed for targeting these topologies. [...]
2020 - 2 p. - Published in : Nuovo Cimento C 43 (2020) 105 Fulltext: PDF;
In : 18th Incontri di Fisica delle Alte Energie, Naples, Italy, 8 - 10 April 2019, pp.105

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2021-05-11
06:01
Measurements of the relative alignment of the muon spectrometer precision chambers in $\sqrt {s}$ = 13 TeV proton-proton collisions with the ATLAS detector / Vannicola, D (INFN, Rome ; Rome U.)
A good muon momentum resolution in the region from hundreds of GeV to several TeV is crucial for searches for new physics, such as $W$' → $\mu$$ν$ and $Z$' → $\mu\mu$ (ATLAS Collaboration, Phys. Lett. [...]
2020 - 2 p. - Published in : Nuovo Cimento C 43 (2020) 104 Fulltext: PDF;
In : 18th Incontri di Fisica delle Alte Energie, Naples, Italy, 8 - 10 April 2019, pp.104

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2021-05-11
06:01
Ultra-Fast Silicon Detectors for CMS Phase II upgrade / Tornago, M (Turin U. ; INFN, Turin) /CMS Collaboration
The Minimimum Ionizing Particle Timing Layer (MTD), proposed for the CMS Phase II upgrade at the High Luminosity LHC, will be provided with Ultra-Fast Silicon Detectors (UFSD), that will be covering an area of ∼ 15 m2 in the pseudorapidity region 1.5 < |η| < 3. MTD has the aim of adding timing information to reconstructed tracks with a precision of ∼ 30 ps: UFSD are the suited technology to reach the goal. [...]
2020 - 4 p. - Published in : Nuovo Cimento C 43 (2020) 103 Fulltext: PDF;
In : 18th Incontri di Fisica delle Alte Energie, Naples, Italy, 8 - 10 April 2019, pp.103

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2021-05-11
06:01
Search for chargino neutralino production in final states with a $W$ boson and Higgs boson / Todome, Kazuki (INFN, Bologna) /ATLAS Collaboration
Supersymmetry (SUSY) is an extension of the Standard Model (SM), and its searches are a central part of ATLAS physics program. In this proceeding, the most recent result in searches of chargino ($\bar{X}$$_{1}^{+}$) and neutralino ($\bar{X}$$_{2}^{0}$) production where $\bar{X}$$_{1}^{+}$ decays in a $W$ boson and the lightest and stable SUSY particle ($\bar{X}$$_{1}^{0}$), while $\bar{X}$$_{2}^{0}$ decays in the lightest SUSY particle and a SM Higgs boson is reported. [...]
2020 - 2 p. - Published in : Nuovo Cimento C 43 (2020) 102
In : 18th Incontri di Fisica delle Alte Energie, Naples, Italy, 8 - 10 April 2019, pp.102

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2021-05-11
06:01
ATLAS Pixel Detector during Run 2 / Rossini, Lorenzo (Milan U. ; INFN, Milan)
Silicon pixel detectors are at the core of the current and planned upgrade of the ATLAS detector at the Large Hadron Collider (LHC). During Run 2 of LHC the detector had to sustain many challenges in order to keep the performances and quality of data taking constant in time, against the increasing instantaneous luminosity, increasing pile-up, and radiation damage. [...]
2020 - 3 p. - Published in : Nuovo Cimento C 43 (2020) 97
In : 18th Incontri di Fisica delle Alte Energie, Naples, Italy, 8 - 10 April 2019, pp.97

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2021-05-11
06:01
Searches for supersymmetric higgsinos with the ATLAS detector / Rossini, Lorenzo (Milan U. ; INFN, Milan)
A search for supersymmetric partners of the Higgs and gauge bosons (charginos and neutralinos) is presented in this work, using the data from the ATLAS experiment collected at LHC. Considerations on the naturalness of the Higgs boson mass suggest that the two lightest neutralinos might be a mix of the partners of the Higgs boson and could have a similar mass. [...]
2020 - 3 p. - Published in : Nuovo Cimento C 43 (2020) 96
In : 18th Incontri di Fisica delle Alte Energie, Naples, Italy, 8 - 10 April 2019, pp.96

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2021-05-11
06:01
BIS78, a pilot project for Phase-2 ATLAS RPC and beyond / Pizzimento, L (INFN, Rome2)
The architecture of the present trigger system in the ATLAS muon barrel was designed according to a reference luminosity of 10$^{34}$ cm$^{−2}$s $^{−1}$ with a safety factor of 5, with respect to the simulated background rates, now confirmed by LHC Run 1 data. HL-LHC will provide a luminosity 5 times higher and an order of magnitude higher background. [...]
2020 - 2 p. - Published in : Nuovo Cimento C 43 (2020) 92
In : 18th Incontri di Fisica delle Alte Energie, Naples, Italy, 8 - 10 April 2019, pp.92

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2021-05-11
06:01
Performaces of the ATLAS New Small Wheel micromegas chambers at the CERN Gamma Ray Irradiation Facility / Pezzotti, L (Pavia U. ; INFN, Pavia)
One of the main upgrades of the ATLAS Experiment during Long- Shutdown II is the replacement of the forward muon spectrometer inner station, the Small Wheel. The New Small Wheel, covering the pseudorapidity region 1.3 < $\eta$ < 2.7, adopts micromegas micro pattern gas detectors for the muons precision tracking. [...]
2020 - 2 p. - Published in : Nuovo Cimento C 43 (2020) 88
In : 18th Incontri di Fisica delle Alte Energie, Naples, Italy, 8 - 10 April 2019, pp.88

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2021-05-11
06:01
Observation of $CP$ violation in an amplitude analysis of $B^+ \to \pi^+\pi^+\pi^-$ decays / O'Hanlon, D P (INFN, Bologna) /LHCb Collaboration
The violation of charge-parity ($CP$) symmetry in the Standard Model is driven by a single global phase, however manifestations of $CP$-violating quantities are non-trivial due to the essential role of the strong interaction in generating observable $CP$ violation effects. Here we explore how the role of the strong phase in $B^+ \to \pi^+\pi^+\pi^-$ decays, described by the intermediate resonance structure and final-state rescattering effects, governs the manifestation of large $CP$ violation..
2020 - 2 p. - Published in : Nuovo Cimento C 43 (2020) 87
In : 18th Incontri di Fisica delle Alte Energie, Naples, Italy, 8 - 10 April 2019, pp.87

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2021-05-11
06:01
Measurements of the Higgs production cross section in the $H \to \tau\tau$ decay channel with the ATLAS experiment / Murrone, A (INFN, Milan ; Milan U.)
Measurements of the Higgs production cross section in the $H \to \tau\tau$ decay channel are presented. The analysis has been performed using 36.1 fb −1 of data collected by the ATLAS experiment at $\sqrt{s}$ = 13TeV proton-proton collisions at the Large Hadron Collider. [...]
2020 - 3 p. - Published in : Nuovo Cimento C 43 (2020) 86
In : 18th Incontri di Fisica delle Alte Energie, Naples, Italy, 8 - 10 April 2019, pp.86

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