0000000000055568

AUTHOR

Ashlie Martini

showing 3 related works from this author

Nanoseconds Timing System Based on IEEE 1588 FPGA Implementation

2019

Clock synchronization procedures are mandatory in most physical experiments where event fragments are readout by spatially dislocated sensors and must be glued together to reconstruct key parameters (e.g. energy, interaction vertex etc.) of the process under investigation. These distributed data readout topologies rely on an accurate time information available at the frontend, where raw data are acquired and tagged with a precise timestamp prior to data buffering and central data collecting. This makes the network complexity and latency, between frontend and backend electronics, negligible within upper bounds imposed by the frontend data buffer capability. The proposed research work describ…

EthernetFOS: Computer and information sciencesNuclear and High Energy PhysicsEye diagram; field-programmable gate arrays (FPGAs); front-end electronics; hardware; synchronization; timing systemfront-end electronicEye diagramtiming systemSerial communicationData bufferNetwork topology01 natural sciencesClock synchronizationNOComputer Science - Networking and Internet ArchitecturePE2_20103 physical sciencesSynchronization (computer science)hardwareElectrical and Electronic EngineeringNetworking and Internet Architecture (cs.NI)010308 nuclear & particles physicsbusiness.industrySettore FIS/01 - Fisica Sperimentalefront-end electronicsNuclear Energy and Engineeringfield-programmable gate arrays (FPGAs)Precision Time ProtocolbusinesssynchronizationComputer hardwareData link layer
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Search for Axionlike Particles Produced in e+e− Collisions at Belle II

2020

We present a search for the direct production of a light pseudoscalar a decaying into two photons with the Belle II detector at the SuperKEKB collider. We search for the process e+e-→γa, a→γγ in the mass range 0.2<ma<9.7 GeV/c2 using data corresponding to an integrated luminosity of (445±3) pb-1. Light pseudoscalars interacting predominantly with standard model gauge bosons (so-called axionlike particles or ALPs) are frequently postulated in extensions of the standard model. We find no evidence for ALPs and set 95% confidence level upper limits on the coupling strength gaγγ of ALPs to photons at the level of 10-3 GeV-1. The limits are the most restrictive to date for 0.2<ma<1 GeV/c2.

PhysicsRange (particle radiation)Particle physicsGauge bosonLuminosity (scattering theory)Photon010308 nuclear & particles physicsGeneral Physics and Astronomy01 natural scienceslaw.inventionStandard ModelPseudoscalarDirect productionlaw0103 physical sciencesHigh Energy Physics::Experiment010306 general physicsColliderPhysical Review Letters
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Search for quark contact interactions in dijet angular distributions in pp collisions at s=7 TeV measured with the ATLAS detector

2011

Dijet angular distributions from the first LHC pp collisions at center-of-mass energy sqrt(s) = 7 TeV have been measured with the ATLAS detector. The dataset used for this analysis represents an integrated luminosity of 3.1 pb-1. Dijet $\chi$ distributions and centrality ratios have been measured up to dijet masses of 2.8 TeV, and found to be in good agreement with Standard Model predictions. Analysis of the $\chi$ distributions excludes quark contact interactions with a compositeness scale $\Lambda$ below 3.4 TeV, at 95% confidence level, significantly exceeding previous limits.

QuarkPhysicsNuclear and High Energy PhysicsParticle physicsLuminosity (scattering theory)Large Hadron ColliderScale (ratio)010308 nuclear & particles physicsAtlas detectorAstrophysics::High Energy Astrophysical PhenomenaHigh Energy Physics::Phenomenology7. Clean energy01 natural sciencesStandard ModelNuclear physicsmedicine.anatomical_structureAtlas (anatomy)0103 physical sciencesmedicineHigh Energy Physics::Experiment010306 general physicsPhysics Letters B
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