0000000000073861

AUTHOR

H. Masuda

showing 4 related works from this author

Beam study of irradiated ATLAS-SCT prototypes

2002

Abstract Prototypes of ATLAS-SCT modules with ABCD readout chips were tested in a 4 GeV/c pion beam at KEK's proton synchrotron. Of both SCT module geometries—barrel and forward—three identical modules were placed in the beam. One module of each type had been irradiated to 3×1014 protons/cm2 in the CERN PS previous to the beam test. A method has been developed to reconstruct the time-resolved shaper pulse from the binary hit information, allowing a more detailed study of the timing properties of the ABCD. The present results will be compared to a simulation of the charge collection and Front End electronics response.

PhysicsNuclear and High Energy PhysicsLarge Hadron ColliderPhysics::Instrumentation and Detectorsbusiness.industryProton SynchrotronFront end electronicsLinear particle acceleratorPulse (physics)Opticsmedicine.anatomical_structureAtlas (anatomy)medicinePhysics::Accelerator PhysicsIrradiationNuclear ExperimentbusinessInstrumentationBeam (structure)Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
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Measurement of the relative yields of ψ(2S) to ψ(1S) mesons produced at forward and backward rapidity in p+p , p+Al , p+Au , and He3+Au collisions at…

2017

The PHENIX Collaboration has measured the ratio of the yields of ψ(2S) to ψ(1S) mesons produced in p+p, p+Al, p+Au, and He3+Au collisions at sNN=200 GeV over the forward and backward rapidity intervals 1.2<|y|<2.2. We find that the ratio in p+p collisions is consistent with measurements at other collision energies. In collisions with nuclei, we find that in the forward (p-going or He3-going) direction, the relative yield of ψ(2S) mesons to ψ(1S) mesons is consistent with the value measured in p+p collisions. However, in the backward (nucleus-going) direction, the ψ(2S) meson is preferentially suppressed by a factor of ∼2. This suppression is attributed in some models to the breakup of the w…

PhysicsParticle physicsMeson010308 nuclear & particles physicsBranching fractionHigh Energy Physics::LatticeHigh Energy Physics::PhenomenologyNuclear TheoryQuarkonium01 natural sciencesDeconfinementNuclear physicsExcited state0103 physical sciencesQuark–gluon plasmaHigh Energy Physics::ExperimentRapidityNuclear Experiment010306 general physicsGlauberPhysical Review C
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Measurement of ϕ -meson production at forward rapidity in p+p collisions at s=510  GeV and its energy dependence from s=200  GeV to 7 TeV

2018

The PHENIX experiment at the Relativistic Heavy Ion Collider has measured the differential cross section of φ(1020)-meson production at forward rapidity in p+p collisions at s=510 GeV via the dimuon decay channel. The partial cross section in the rapidity and pT ranges 1.2

PhysicsScattering cross-sectionMeson production010308 nuclear & particles physicsNuclear TheoryStrangeness01 natural sciencesNuclear physics0103 physical sciencesQuark–gluon plasmaHigh Energy Physics::ExperimentRapidityNuclear Experiment010306 general physicsRelativistic Heavy Ion ColliderPhysical Review D
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Measurements of mass-dependent azimuthal anisotropy in central p + Au, d + Au, and He3 + Au collisions at sNN=200 GeV

2018

We present measurements of the transverse- momentum dependence of elliptic flow v2 for identified pions and (anti)protons at midrapidity (|η|<0.35), in 0%–5% central p+Au and He3+Au collisions at sNN=200 GeV. When taken together with previously published measurements in d+Au collisions at sNN=200 GeV, the results cover a broad range of small-collision-system multiplicities and intrinsic initial geometries. We observe a clear mass-dependent splitting of v2(pT) in d+Au and He3+Au collisions, just as in large nucleus-nucleus (A+A) collisions, and a smaller splitting in p+Au collisions. Both hydrodynamic and transport model calculations successfully describe the data at low pT (<1.5GeV/c), but …

PhysicsLarge Hadron Collider010308 nuclear & particles physicsNuclear TheoryHadronElliptic flowConstituent quarkMultiplicity (mathematics)Kinetic energy01 natural sciencesNuclear physicsPion0103 physical sciencesNuclear Experiment010306 general physicsAnisotropyPhysical Review C
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