141,867 research outputs found
Validation of the 65 nm TPSCo CMOS imaging technology for the ALICE ITS3
No full textDuring the next Long Shutdown (LS3) of the LHC, planned for 2026, the innermost three
layers of the ALICE Inner Tracking System will be replaced by a new vertex detector composed of curved ultra-thin monolithic silicon sensors. The R&D initiative on monolithic sensors of the CERN Experimental Physics Department, in cooperation with the ALICE ITS3 upgrade project, prepared the first submission of chip designs in the TPSCo 65 nm technology, called MLR1 (Multi Layer Reticle). It contains four different test structures with different process splits and pixel designs. These proceedings illustrate the first validation of the technology in terms of pixel performance and radiation hardness
T2K oscillation results
No full textThe T2K (Tokai-to-Kamioka) experiment is a second generation long baseline neutrino oscillation experiment that probes physics beyond the Standard Model. An off-axis neutrino beam with a peak energy of ∼0.6∼0.6 GeV is produced at the J-PARC accelerator facility, with the flavour content dominated by either muon neutrinos or muon anti-neutrinos, depending on the choice of the polarity of the magnetic focusing horns. The neutrino beam is detected first in the near detector ND280, where the flavour composition of the incoming neutrino flux is not expected to be affected by oscillation, and then travels 295 km to the far detector Super-Kamiokande, where oscillation significantly affects the flavour composition. We report the results of a joint analysis of neutrino and antineutrino oscillations at T2K with the νμνμ (ν ̄μν ̄μ) disappearance and νμνμ (ν ̄μν ̄μ) →→ νeνe (ν ̄eν ̄e) appearance channels, obtained by collecting a total statistic of 7.57×10207.57×1020 protons-on-target in νν-mode and 7.53×10207.53×1020 in ν ̄ν ̄-mode. The results in the disappearance channel shows that our data continue to prefer maximal θ23θ23 mixing (sin2θ23=0.532+0.046−0.068sin2θ23=0.532−0.068+0.046, in case of normal mass hierarchy) and no violation of the CPT theorem, while in the appearance channel, we observed a large νeνe appearance and a low ν ̄eν ̄e appearance with respect to the expectations. These results favour a δCP∼−π/2δCP∼−π/2, with a 90% confidence interval of [−3.13,−0.39][−3.13,−0.39] in normal mass hierarchy and [−2.09,−0.74][−2.09,−0.74] in inverted mass hierarchy. We comment briefly on the future prospects for T2K, including a proposal for extended running to accumulate 20×102120×1021 protons-on-target, nearly three times the currently approved amount by 2026, to gain substantial sensitivity to CP violating effects in νμνμ (ν ̄μν ̄μ) →→ νeνe (ν ̄eν ̄e) oscillations if parameters are favorable
Highlights from the ARGO-YBJ Experiment
No full textIn this work we will report on some of the main results of the ARGO-YBJ experiment including the observation of galactic and extragalactic gamma ray sources and the measurements on the
charged cosmic ray flux in the 1 TeV−1 PeV energy range
Very high energy gamma-ray astronomy and cosmic ray physics with the ARGO-YBJ experiment
No full textGamma ray astronomy at energies 10^11-10^13 eV, which are strictly related to the identification
and study of the cosmic ray acceleration sites, is the main scientific goal of the ARGO-YBJ experiment.
The detector, which is now being assembled in Tibet (China) at 4300 m a.s.l., is a full coverage Extensive Air Shower array consisting of a carpet of Resistive Plate Chambers covering a surface of about 7000 m2. The high altitude ( atmospheric depth
600 g/cm2 ) and the full coverage ensure a very low primary photon energy threshold at few hundreds GeV (close to the limits of the satellite technology), while the detector time resolution sigma_t=1ns gives a good pointing accuracy,
thus allowing a high sensitivity to gamma -ray sources. Moreover the large field of view and the high duty-cycle ensure the continuous monitoring of the sky.
The detector layout, performance and location, offer a unique possibility to make also a deep study of several characteristics of the hadronic component of the cosmic ray flux up to energies of
hundreds of TeV. In particular, the structure of the shower core, the lateral distribution, the energy spectra and the angular (e.g. anisotropies) and time (e.g. solar flares) flux modulations can be
measured with high sensitivity. Moreover, the use of a full coverage detector with a high space
granularity gives detailed images of the shower front, that can be used to test different hypotheses on the cosmic ray interactions, the shower development in the atmosphere and particle physics at
very high energies. In this work the general layout of the detector and its performance will be described, together
with some of the first results coming from the data analysis of a relevant fraction of the apparatus that is already operating
Searches for supersymmetric particles with prompt decays with the ATLAS detector
No full textSupersymmetry (SUSY) provides elegant solutions to several problems in the Standard Model and searches for SUSY particles are an important component of the LHC physics program. The latest results from electroweak and strong SUSY
searches are reported here, conducted by the ATLAS experiment at the CERN LHC. The searches target multiple final states and different assumptions about the decay mode of the produced SUSY particles, including searches for both R-parity conserving models and R-parity violating models, and their possible connections with the recent observation of the flavour and muon g-2 anomalies. The talk will also highlight the employment of novel analysis techniques, including
advanced machine learning techniques and special object reconstruction, that are necessary for many of these analyses to extend the sensitivity reach to challenging regions of the phase space
Data taking system for the NEMO experiment
No full textA four-floors prototype of the Nemo towers has been successfully deployed off the Sicily coast in December 2006. The detector is working and data acquisition is going on since then. The aim of this contribution is to give an overview of the NEMO electronic system and to explain the different stages of data acquisition and transport. The underwater electronics sample signals from photomultipliers and acquire slow-control data both from oceanographic instruments and dedicated sensors, allowing to monitor the operational conditions of the apparatus. The whole data are sent to laboratory through a fully bidirectional fiber optic link. On shore the data are received by dedicated boards that distribute them to first level-trigger and to the slow-control system. The NEMO data acquisition/transmission electronic system will be described, properties of acquired signals and of data flow will be discussed
The PANDA experiment: Antiproton physics at FAIR
No full textThe new Facility for Antiproton and Ion Research (FAIR), under
construction at the GSI laboratory at Darmstadt, in a few years will make available,
among different types of beams, even antiproton beams with unique features.
Through a High Energy Storage Ring (HESR) for antiprotons, an antiproton beam
will be available in a momentum range from 1.5 to 15 GeV/c, which will interact
on a hydrogen target. The products of the interaction, including hadronic systems
with strangeness and/or charm, will be detected with the PANDA magnetic spectrometer
(antiProton ANnihilation at DArmstadt), and the spectroscopic analysis
will allow a detailed investigation on a number of open problems of the hadronic
physics, as the quark confinement, the existence of non-conventional meson states
(so-called glueballs and hybrids), the structure of hadrons and of the strong interaction,
with particular attention to charmonium spectroscopy. An overview of the
scientific program of PANDA and the current status of the project will be presented
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