SafeTI Traffic Injector Enhancement for Effective Interference Testing in Critical Real-Time Systems

Safety-critical domains, such as automotive, space, and robotics, are adopting increasingly powerful multicores with abundant hardware shared resources for higher performance and efficiency. However, mutual interference due to parallel operation within the SoC must be properly validated. Recently, the SafeTI traffic injector has been released and integrated in a homogeneous RISC-V multicore for testing, otherwise untestable casuistic for software-only solutions. This paper introduces some enhancements performed on the SafeTI, which include internal pipelining for higher-rate traffic injection, and its tailoring to multiple interfaces, as well as its integration in a more powerful heterogeneous RISC-V multicore based on Gaisler's technology for the space domain.Comment: Abstract from the RISC-V Summit, June 2023, Barcelona (Spain

Studies of irradiated AMS H35 CMOS detectors for the ATLAS tracker upgrade

Silicon detectors based on the HV-CMOS technology are being investigated as possible candidate for the outer layers of the ATLAS pixel detector for the High Luminosity LHC. In this framework the H35Demo ASIC has been produced in the 350 nm AMS technology (H35). The H35Demo chip has a large area ($18.49 \times 24.40 \, \mathrm{mm^2}$) and includes four different pixel matrices and three test structures. In this paper the radiation hardness properties, in particular the evolution of the depletion region with fluence is studied using edge-TCT on test structures. Measurements on the test structures from chips with different substrate resistivity are shown for non irradiated and irradiated devices up to a cumulative fluence of $2 \cdot 10^{15} \, \mathrm{1\,MeV\, n_{eq} / cm^{2}}$

Radiation hard Depleted Monolithic Active Pixel Sensors with high-resistivity substrates

High Voltage/High resistivity Depleted Monolithic Active Pixel Sensors (HV/HR-DMAPS) is a technology which is becoming of great interest for high energy physics applications.With respect to hybrid pixel detectors the monolithic approach offers the main advantages of reduced material budget and production costs due to the absence of the bump bonding process. This aspect is important especially when large areas need to be covered as in the tracking detectors of the LHC experiments. Thus, the possibility of employing this technology in the outermost layers of the upgraded ATLAS pixel detector at the HL-LHC is being investigated.Different HR/HV-DMAPS prototypes have been recently developed for the future ATLAS Inner Tracker (ITk) with the aim of studying their radiation hardness and the feasibility of producing large area devices.The H35DEMO is a large area demonstrator chip for the ITk designed by KIT, IFAE and University of Liverpool and produced in AMS 350 nm HV-CMOS technology with an engineering run on four different substrate resistivities: 20, 80, 200 and 1000 $\mathrm{\Omega cm}$. It consists of four large matrices, two of which include digital electronics and are thus fully monolithic. One, called CMOS matrix, has comparators made of CMOS transistors in the periphery only, while the other, called NMOS matrix, includes also comparators made of NMOS transistors directly in the pixels. The other two matrices have only analog front-end electronics and are meant to be coupled to ATLAS FE-I4 chips. All matrices feature pixels with a size of $\mathrm{(50\times250)\;\mu m^2}$ in which the analog electronics are embedded in a Deep N-WELL (DNWELL) also acting as collecting electrode.A Data Acquisition (DAQ) system was developed at IFAE to read out and test the monolithic matrices of the H35DEMO both in the laboratory and with beam test experiments. H35DEMO chips with a resistivity of 200 $\mathrm{\Omega cm}$ have been irradiated with reactor neutrons to a particle fluence of $1\times10^{15}$ $\mathrm{1\;MeV\;n_{eq}/cm^2}$, the expected fluence for the outermost pixel layer of ITk. The monolithic CMOS matrix of the H35DEMO chip was extensively characterised before and after irradiation in beam tests at Fermilab and DESY, with proton and electron beams, respectively.Results after irradiation show good performance in terms of hit efficiency with thresholds of about 1800 e and a bias voltage of 150 V.Another production of monolithic HV-CMOS prototypes in LFoundry 150 nm technology (LF2) has been recently completed. It includes sensors with a similar DNWELL concept as the H35DEMO but with a smaller pixel size of $\mathrm{(50\times50)\;\mu m^2}$. Preliminary measurements of leakage current of the LF2 chips have been preformed showing good agreement with what expected from the foundry process

RD50-MPW3: A fully monolithic digital CMOS sensor for future tracking detectors

The CERN-RD50 CMOS working group develops the RD50-MPWseries of monolithic high-voltage CMOS pixel sensors for potential use in future high luminosity experiments such as the HL-LHC and FCC-hh. In this contribution, the design of the latest prototype in this series, RD50-MPW3, is presented. An overview of its pixel matrix and digital readout periphery is given, with discussion of the new structures implemented in the chip and the problems they aim to solve. The main analog and digital features of the sensor are already tested and initial laboratory characterisation of the chip is presented

Dalitz plot analysis of B0→D¯0π+π- decays

The resonant substructures of B0 → D0π +π − decays are studied with the Dalitz plot technique. In this study a data sample corresponding to an integrated luminosity of 3.0 fb−1 of pp collisions collected by the LHCb detector is used. The branching fraction of the B0 → D0π +π − decay in the region m(D0π ±) > 2.1 GeV/c2 is measured to be (8.46 ± 0.14 ± 0.29 ± 0.40) × 10−4 , where the first uncertainty is statistical, the second is systematic and the last arises from the normalisation channel B0 → D∗ (2010)−π +. The π +π − S-wave components are modelled with the Isobar and K-matrix formalisms. Results of the Dalitz plot analyses using both models are presented. A resonant structure at m(D0π −) ≈ 2.8 GeV/c2 is confirmed and its spin-parity is determined for the first time as J P = 3−. The branching fraction, mass and width of this structure are determined together with those of the D∗ 0 (2400)− and D∗ 2 (2460)− resonances. The branching fractions of other B0 → D0h 0 decay components with h 0 → π +π − are also reported. Many of these branching fraction measurements are the most precise to date. The first observation of the decays B0 → D0f0(500), B0 → D0f0(980), B0 → D0ρ(1450), B0 → D∗ 3 (2760)−π + and the first evidence of B0 → D0f0(2020) are presented

Measurement of the time-dependent CP asymmetries in B {s/0} → J/ ψK {S/0}

The first measurement of decay-time-dependent CP asymmetries in the decay B0 s → J/ψ K0 S and an updated measurement of the ratio of branching fractions B(B0 s → J/ψ K0 S )/B(B0→ J/ψ K0 S ) are presented. The results are obtained using data corresponding to an integrated luminosity of 3.0 fb−1 of proton-proton collisions recorded with the LHCb detector at centre-of-mass energies of 7 and 8 TeV. The results on the CP asymmetries are A∆Γ B 0 s → J/ψ K0 S = 0.49 ± 0.77 0.65 (stat) ± 0.06 (syst) , Cdir B 0 s → J/ψ K0 S = −0.28 ± 0.41 (stat) ± 0.08 (syst) , Smix B 0 s → J/ψ K0 S = −0.08 ± 0.40 (stat) ± 0.08 (syst) . The ratio B(B0 s → J/ψ K0 S )/B(B0→ J/ψ K0 S ) is measured to be 0.0431 ± 0.0017 (stat) ± 0.0012 (syst) ± 0.0025 (fs/fd) , where the last uncertainty is due to the knowledge of the B0 s and B0 production fracti

Determination of the branching fractions of B S 0 → D S ∓ K ∓ and B 0 → D S − K +

B0 → D− s K+ relative to the decays B0 s → D− s π + and B0 → D−π +, respectively. The data used correspond to an integrated luminosity of 3.0 fb−1 of proton-proton collisions. The ratios of branching fractions are B(B0 s → D∓ s K∓) B(B0 s → D − s π+) = 0.0752 ± 0.0015 ± 0.0019 and B(B0 → D− s K+) B(B0 → D−π+) = 0.0129 ± 0.0005 ± 0.0008, where the uncertainties are statistical and systematic, respectively. Keywords: Hadron-Hadron Scattering, Branching fraction, B physics, Flavor physic

Measurement of the exclusive Υ production cross-section in pp collisions at √{s}=7 TeV and 8 TeV

A study is presented of central exclusive production of Υ(nS) states, where the Υ(nS) resonances decay to the µ +µ − final state, using pp collision data recorded by the LHCb experiment. The cross-section is measured in the rapidity range 2 < y(Υ) < 4.5 where the muons are reconstructed in the pseudorapidity range 2 < η(µ ±) < 4.5. The data sample corresponds to an integrated luminosity of 2.9 fb−1 and was collected at centre-of-mass energies of 7 TeV and 8 TeV. The measured Υ(1S) and Υ(2S) production cross-sections are σ(pp → pΥ(1S)p) = 9.0 ± 2.1 ± 1.7 pb and σ(pp → pΥ(2S)p) = 1.3 ± 0.8 ± 0.3 pb, where the first uncertainties are statistical and the second are systematic. The Υ(1S) cross-section is also measured as a function of rapidity and is found to be in good agreement with Standard Model predictions. An upper limit is set at 3.4 pb at the 95% confidence level for the exclusive Υ(3S) production cross-section, including possible contamination from χb(3P) → Υ(3S)γ decays

Measurement of the forward Z boson production cross-section in pp collisions at TeV

A measurement of the production cross-section for Z bosons that decay to muons is presented. The data were recorded by the LHCb detector during pp collisions at a centre-of-mass energy of 7 TeV, and correspond to an integrated luminosity of 1.0 fb−1 . The cross-section is measured for muons in the pseudorapidity range 2.0 20 GeV/c. The dimuon mass is restricted to 60 < Mµ+µ− < 120 GeV/c2 . The measured cross-section is σZ→µ+µ− = (76.0 ± 0.3 ± 0.5 ± 1.0 ± 1.3) pb where the uncertainties are due to the sample size, systematic effects, the beam energy and the luminosity. This result is in good agreement with theoretical predictions at next-to-next-to-leading order in perturbative quantum chromodynamics. The cross-section is also measured differentially as a function of kinematic variables of the Z boson. Ratios of the production cross-sections of electroweak bosons are presented using updated LHCb measurements of W boson production. A precise test of the Standard Model is provided by the measurement of the rati

Search for lepton-flavor violating decays B+ →k+μ±eâ'

A search for the lepton-flavor violating decays B+→K+μ±eâ' is performed using a sample of proton-proton collision data, collected with the LHCb experiment at center-of-mass energies of 7 and 8 TeV and corresponding to an integrated luminosity of 3 fb-1. No significant signal is observed, and upper limits on the branching fractions are set as B(B+→K+μ-e+)<7.0(9.5)×10-9 and B(B+→K+μ+e-)<6.4(8.8)×10-9 at 90% (95)% confidence level. The results improve the current best limits on these decays by more than one order of magnitud