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W. Iwanski

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University Medical Center Utrecht

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Papers by W. Iwanski

PMF: The front end electronic of the ALFA detector

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2010

The front end electronic (PMF) of the future ATLAS luminometer is described here. It is composed ... more The front end electronic (PMF) of the future ATLAS luminometer is described here. It is composed by a MAPMT and a compact stack of three PCBs which deliver the high voltage, route and readout the output signals. The third board contains a FPGA and MAROC, a 64 channels ASIC which can correct the non uniformity of the MAPMT channels gain thanks to a variable gain preamplifier. Its main role is to shape and discriminate the input signals at 1/3 photo-electron and produce 64 trigger outputs. Laboratory tests performed on prototype and pre-series PMFs have showed performances in good agreement with the requirements.

$Research paper thumbnail of The trigger for $K^0 \rightarrow \pi^{0}\pi^{0}$ decays of the NA48 experiment at CERN$

The trigger for $K^0 \rightarrow \pi^{0}\pi^{0}$ decays of the NA48 experiment at CERN

The trigger used for the collection of the samples of $K^{0}$ yields $\pi^{0}\pi^{0}$ decays in t... more The trigger used for the collection of the samples of $K^{0}$ yields $\pi^{0}\pi^{0}$ decays in the NA48 experiment at CERN uses a novel pipeline design in order to satisfy the demanding specifications of a high rate kaon beam. The trigger algorithms, architecture and performance are described. copy 2002 Elsevier Science B.V. All rights reserved.

The beam and detector for the NA48 neutral kaon CP violation experiment at CERN

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2007

A 40 MHz-pipelined trigger for K0→2π0 decays for the CERN NA48 experiment

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1998

A first level trigger system based on a 40 MHz digital pipeline has been developed for the CERN N... more

A fully software-programmable pipelined trigger-processing module

IEEE Transactions on Nuclear Science, 1996

ABSTRACT We describe a general purpose 40 MHz pipelined trigger processing board containing six l... more ABSTRACT We describe a general purpose 40 MHz pipelined trigger processing board containing six look-up tables and the logic needed to programmably route the signals between them. A series of identical boards are connected in cascade in the NA48 CP-violation experiment at CERN, accept digital inputs generated from calorimeter signals and are used to perform the different computations necessary for the trigger reconstruction. The board architecture is designed to be flexible so that a single basic hardware design can perform all the different algorithms we require and so that the trigger algorithms can be adapted if needed. The computation latency of the combined network of eight boards is approximately 3 μs. We present examples of some of the functions which have been implemented. We discuss the automatic reprogramming software which has been developed so that a new design can be implemented easily

A 40 MHz pipelined trigger for K/sup 0/→2π/sup 0/ decays for the CERN NA48 experiment

IEEE Transactions on Nuclear Science, 1998

A first level trigger system based on a 40 MHz digital pipeline has been developed for the CERN N... more

$Research paper thumbnail of Analysis of events with b-jets and a pair of leptons of the same charge in pp collisions at s = 8 $$ \sqrt{s}=8 $$ TeV with the ATLAS detector$

Analysis of events with b-jets and a pair of leptons of the same charge in pp collisions at s = 8 $$ \sqrt{s}=8 $$ TeV with the ATLAS detector

Journal of High Energy Physics, 2015

ABSTRACT

Search for photonic signatures of gauge-mediated supersymmetry in 8 TeV p p collisions with the ATLAS detector

Physical Review D, 2015

ABSTRACT 43 pages plus author list (60 pages total), 12 figures, 9 tables, submitted to Phys. Rev... more

Search for type-III seesaw heavy leptons in p p collisions at s = 8 TeV with the ATLAS detector

Physical Review D, 2015

ABSTRACT

$Research paper thumbnail of Measurements of the Nuclear Modification Factor for Jets in Pb+Pb Collisions at sqrt[s_{NN}]=2.76 TeV with the ATLAS Detector$

Measurements of the Nuclear Modification Factor for Jets in Pb+Pb Collisions at sqrt[s_{NN}]=2.76 TeV with the ATLAS Detector

Physical review letters, Jan 20, 2015

Measurements of inclusive jet production are performed in pp and Pb+Pb collisions at sqrt[s_{NN}]... more Measurements of inclusive jet production are performed in pp and Pb+Pb collisions at sqrt[s_{NN}]=2.76 TeV with the ATLAS detector at the LHC, corresponding to integrated luminosities of 4.0 and 0.14 nb^{-1}, respectively. The jets are identified with the anti-k_{t} algorithm with R=0.4, and the spectra are measured over the kinematic range of jet transverse momentum…

Search for contact interactions in dilepton events from pp collisions at with the ATLAS detector

Physics Letters B, 2012

Search for new phenomena in photon + jet events collected in proton-proton collisions at √s = 8 TeV with the ATLAS detector

√ s = 8 TeV with the ATLAS detector ✩ .ATLAS Collaboration a r t i c l e i n f o a b s t r a c t

Search for the Standard Model Higgs boson in the decay channel H→ZZ(*)→4ℓ with the ATLAS detector

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2011

Search for pair production of first or second generation leptoquarks in proton-proton collisions at √s=7TeV using the ATLAS detector at the LHC

Physical Review D - Particles, Fields, Gravitation and Cosmology, 2011

Search for heavy long-lived charged particles with the ATLAS detector in pp collisions at √s=7 TeV

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2011

A search for long-lived charged particles reaching the muon spectrometer is performed using a dat... more A search for long-lived charged particles reaching the muon spectrometer is performed using a data sample of 37 pb −1 from pp collisions at √ s = 7 TeV collected by the ATLAS detector at the LHC in 2010. No excess is observed above the estimated background. Stableτ sleptons are excluded at 95% CL up to a mass of 136 GeV, in GMSB models with N 5 = 3, m messenger = 250 TeV, sign(µ) = 1 and tanβ = 5. Electroweak production of sleptons is excluded up to a mass of 110 GeV. Gluino R-hadrons in a generic interaction model are excluded up to masses of 530 GeV to 544 GeV depending on the fraction of R-hadrons produced asg-balls.

Measurement of the Υ(1S) production cross-section in pp collisions at s=7 TeV in ATLAS

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2011

A measurement of the cross-section for ϒ(1S) → µ + µ − production in proton-proton collisions at ... more A measurement of the cross-section for ϒ(1S) → µ + µ − production in proton-proton collisions at centre of mass energy of 7 TeV is presented. The cross-section is measured as a function of the ϒ(1S) transverse momentum in two bins of rapidity, |y ϒ(1S) | < 1.2 and 1.2 < |y ϒ(1S) | < 2.4. The measurement requires that both muons have transverse momentum p µ T > 4 GeV and pseudorapidity |η µ | < 2.5 in order to reduce theoretical uncertainties on the acceptance, which depend on the poorly known polarization. The results are based on an integrated luminosity of 1.13 pb −1 , collected with the ATLAS detector at the Large Hadron Collider. The cross-section measurement is compared to theoretical predictions: it agrees to within a factor of two with a prediction based on the NRQCD model including colour-singlet and colour-octet matrix elements as implemented in PYTHIA while it disagrees by up to a factor of ten with the next-to-leading order prediction based on the colour-singlet-model.

A search for new physics in dijet mass and angular distributions in ppcollisions at √s=7 TeV measured with the ATLAS detector

New Journal of Physics, 2011

Search for supersymmetry with jets, missing transverse momentum and at least one hadronically decaying τ lepton in proton-proton collisions at s=7TeV with the ATLAS detector

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2012

ABSTRACT See paper for full list of authors - 7 pages plus author list (20 pages total), 3 figure... more

Search for pair-produced heavy quarks decaying to Wq in the two-lepton channel at √(s)=7TeV with the ATLAS detector

Physical Review D - Particles, Fields, Gravitation and Cosmology, 2012

Search for heavy neutrinos and right-handed W bosons in events with two leptons and jets in pp collisions at √s = 7 TeV with the ATLAS detector

European Physical Journal C, 2012

PMF: The front end electronic of the ALFA detector

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2010

The front end electronic (PMF) of the future ATLAS luminometer is described here. It is composed ... more The front end electronic (PMF) of the future ATLAS luminometer is described here. It is composed by a MAPMT and a compact stack of three PCBs which deliver the high voltage, route and readout the output signals. The third board contains a FPGA and MAROC, a 64 channels ASIC which can correct the non uniformity of the MAPMT channels gain thanks to a variable gain preamplifier. Its main role is to shape and discriminate the input signals at 1/3 photo-electron and produce 64 trigger outputs. Laboratory tests performed on prototype and pre-series PMFs have showed performances in good agreement with the requirements.

$Research paper thumbnail of The trigger for $K^0 \rightarrow \pi^{0}\pi^{0}$ decays of the NA48 experiment at CERN$

The trigger for $K^0 \rightarrow \pi^{0}\pi^{0}$ decays of the NA48 experiment at CERN

The trigger used for the collection of the samples of $K^{0}$ yields $\pi^{0}\pi^{0}$ decays in t... more The trigger used for the collection of the samples of $K^{0}$ yields $\pi^{0}\pi^{0}$ decays in the NA48 experiment at CERN uses a novel pipeline design in order to satisfy the demanding specifications of a high rate kaon beam. The trigger algorithms, architecture and performance are described. copy 2002 Elsevier Science B.V. All rights reserved.

The beam and detector for the NA48 neutral kaon CP violation experiment at CERN

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2007

A 40 MHz-pipelined trigger for K0→2π0 decays for the CERN NA48 experiment

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1998

A first level trigger system based on a 40 MHz digital pipeline has been developed for the CERN N... more

A fully software-programmable pipelined trigger-processing module

IEEE Transactions on Nuclear Science, 1996

ABSTRACT We describe a general purpose 40 MHz pipelined trigger processing board containing six l... more ABSTRACT We describe a general purpose 40 MHz pipelined trigger processing board containing six look-up tables and the logic needed to programmably route the signals between them. A series of identical boards are connected in cascade in the NA48 CP-violation experiment at CERN, accept digital inputs generated from calorimeter signals and are used to perform the different computations necessary for the trigger reconstruction. The board architecture is designed to be flexible so that a single basic hardware design can perform all the different algorithms we require and so that the trigger algorithms can be adapted if needed. The computation latency of the combined network of eight boards is approximately 3 μs. We present examples of some of the functions which have been implemented. We discuss the automatic reprogramming software which has been developed so that a new design can be implemented easily

A 40 MHz pipelined trigger for K/sup 0/→2π/sup 0/ decays for the CERN NA48 experiment

IEEE Transactions on Nuclear Science, 1998

A first level trigger system based on a 40 MHz digital pipeline has been developed for the CERN N... more

$Research paper thumbnail of Analysis of events with b-jets and a pair of leptons of the same charge in pp collisions at s = 8 $$ \sqrt{s}=8 $$ TeV with the ATLAS detector$

Analysis of events with b-jets and a pair of leptons of the same charge in pp collisions at s = 8 $$ \sqrt{s}=8 $$ TeV with the ATLAS detector

Journal of High Energy Physics, 2015

ABSTRACT

Search for photonic signatures of gauge-mediated supersymmetry in 8 TeV p p collisions with the ATLAS detector

Physical Review D, 2015

ABSTRACT 43 pages plus author list (60 pages total), 12 figures, 9 tables, submitted to Phys. Rev... more

Search for type-III seesaw heavy leptons in p p collisions at s = 8 TeV with the ATLAS detector

Physical Review D, 2015

ABSTRACT

$Research paper thumbnail of Measurements of the Nuclear Modification Factor for Jets in Pb+Pb Collisions at sqrt[s_{NN}]=2.76 TeV with the ATLAS Detector$

Measurements of the Nuclear Modification Factor for Jets in Pb+Pb Collisions at sqrt[s_{NN}]=2.76 TeV with the ATLAS Detector

Physical review letters, Jan 20, 2015

Measurements of inclusive jet production are performed in pp and Pb+Pb collisions at sqrt[s_{NN}]... more Measurements of inclusive jet production are performed in pp and Pb+Pb collisions at sqrt[s_{NN}]=2.76 TeV with the ATLAS detector at the LHC, corresponding to integrated luminosities of 4.0 and 0.14 nb^{-1}, respectively. The jets are identified with the anti-k_{t} algorithm with R=0.4, and the spectra are measured over the kinematic range of jet transverse momentum…

Search for contact interactions in dilepton events from pp collisions at with the ATLAS detector

Physics Letters B, 2012

Search for new phenomena in photon + jet events collected in proton-proton collisions at √s = 8 TeV with the ATLAS detector

√ s = 8 TeV with the ATLAS detector ✩ .ATLAS Collaboration a r t i c l e i n f o a b s t r a c t

Search for the Standard Model Higgs boson in the decay channel H→ZZ(*)→4ℓ with the ATLAS detector

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2011

Search for pair production of first or second generation leptoquarks in proton-proton collisions at √s=7TeV using the ATLAS detector at the LHC

Physical Review D - Particles, Fields, Gravitation and Cosmology, 2011

Search for heavy long-lived charged particles with the ATLAS detector in pp collisions at √s=7 TeV

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2011

A search for long-lived charged particles reaching the muon spectrometer is performed using a dat... more A search for long-lived charged particles reaching the muon spectrometer is performed using a data sample of 37 pb −1 from pp collisions at √ s = 7 TeV collected by the ATLAS detector at the LHC in 2010. No excess is observed above the estimated background. Stableτ sleptons are excluded at 95% CL up to a mass of 136 GeV, in GMSB models with N 5 = 3, m messenger = 250 TeV, sign(µ) = 1 and tanβ = 5. Electroweak production of sleptons is excluded up to a mass of 110 GeV. Gluino R-hadrons in a generic interaction model are excluded up to masses of 530 GeV to 544 GeV depending on the fraction of R-hadrons produced asg-balls.

Measurement of the Υ(1S) production cross-section in pp collisions at s=7 TeV in ATLAS

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2011

A measurement of the cross-section for ϒ(1S) → µ + µ − production in proton-proton collisions at ... more A measurement of the cross-section for ϒ(1S) → µ + µ − production in proton-proton collisions at centre of mass energy of 7 TeV is presented. The cross-section is measured as a function of the ϒ(1S) transverse momentum in two bins of rapidity, |y ϒ(1S) | < 1.2 and 1.2 < |y ϒ(1S) | < 2.4. The measurement requires that both muons have transverse momentum p µ T > 4 GeV and pseudorapidity |η µ | < 2.5 in order to reduce theoretical uncertainties on the acceptance, which depend on the poorly known polarization. The results are based on an integrated luminosity of 1.13 pb −1 , collected with the ATLAS detector at the Large Hadron Collider. The cross-section measurement is compared to theoretical predictions: it agrees to within a factor of two with a prediction based on the NRQCD model including colour-singlet and colour-octet matrix elements as implemented in PYTHIA while it disagrees by up to a factor of ten with the next-to-leading order prediction based on the colour-singlet-model.

A search for new physics in dijet mass and angular distributions in ppcollisions at √s=7 TeV measured with the ATLAS detector

New Journal of Physics, 2011

Search for supersymmetry with jets, missing transverse momentum and at least one hadronically decaying τ lepton in proton-proton collisions at s=7TeV with the ATLAS detector

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2012

ABSTRACT See paper for full list of authors - 7 pages plus author list (20 pages total), 3 figure... more

Search for pair-produced heavy quarks decaying to Wq in the two-lepton channel at √(s)=7TeV with the ATLAS detector

Physical Review D - Particles, Fields, Gravitation and Cosmology, 2012

Search for heavy neutrinos and right-handed W bosons in events with two leptons and jets in pp collisions at √s = 7 TeV with the ATLAS detector

European Physical Journal C, 2012