13,571 research outputs found
STAR Spin related future detector upgrades
The STAR experiment at the Relativistic Heavy Ion Collider (RHIC) has a rich
spin physics program aimed at exploring the spin structure of the proton with
polarized proton beams. In addition to the currently accessible channels, heavy
flavor, charged vector boson production and forward mesons are integral parts
of the long-term program. Such measurements require upgrades of the STAR
tracking system and calorimetry. We are presenting an overview of the planned
upgrades and the physics objectives driving them.Comment: 4 pages, 1 figure, to appear in the proceedings of the XIV
International Workshop on Deep Inelastic Scattering (DIS2006), April 2006,
Tsukuba, Japa
Higgs Physics at future Linear Colliders - A Case for precise Vertexing
The discovery of a Higgs boson by the experiments at the LHC marks a major
breakthrough in particle physics, with far-reaching consequences for our
understanding of the fundamental principles of our Universe. To fully explore
this unique particle, experiments at high-energy electron-positron colliders
are being planned, providing substantial added benefit over the capabilities of
the LHC alone, such as model-independent measurements of couplings, constraints
on invisible decays and precise measurements of the self-coupling. This
contribution summarizes the Higgs physics program at such future facilities,
highlighting in particular also the role of precise vertexing in achieving the
ambitious goals of these experiments.Comment: 9 pages, 4 figures, to be published in the proceedings of the 22nd
International Workshop on Vertex Detectors VERTEX 2013, Lake Starnberg,
Germany, September 2013, v2 updated references. arXiv admin note: substantial
text overlap with arXiv:1211.724
Calibration of a Highly Granular Hadronic Calorimeter with SiPM Readout
A highly granular hadronic calorimeter (HCAL) based on scintillator tiles
with individual readout by silicon photomultipliers (SiPMs) has been
constructed by the CALICE collaboration and has been tested extensively in
particle beams at CERN. The 7608 SiPMs coupled to scintillator tiles in the
approximately 1 cubic meter large calorimeter allow large sample studies of
behavior of these devices under varying voltage and temperature as well as
their saturation behavior. We also present detailed studies of the temperature
dependence of the calorimeter signal in muon and hadron beams. The calibration
of the full calorimeter using muons is discussed. In addition, a novel method
for calibration and detector studies using minimum-ionizing track segments in
hadronic showers, is explored.Comment: 4 pages, 9 figures, submitted to the Conference Record of the IEEE
NSS 2008, Dresden, German
The Time Structure of Hadronic Showers in Imaging Calorimeters with Scintillator and RPC Readout
The intrinsic time structure of hadronic showers has been studied to evaluate
its influence on the timing capability and on the required integration time of
highly granular hadronic calorimeters in future collider experiments. The
experiments have been carried with systems of 15 detector cells, using both
scintillator tiles with SiPM readout and RPCs, read out with fast digitizers
and deep buffers. These were installed behind the CALICE scintillator -
Tungsten and RPC - Tungsten calorimeters as well as behind the CALICE
semi-digital RPC - Steel calorimeter during test beam periods at the CERN SPS.
We will discuss the technical aspects of these systems, and present results on
the measurement of the time structure of hadronic showers in steel and tungsten
calorimeters. These are compared to GEANT4 simulations, providing important
information for the validation and the improvement of the physics models. In
addition, a comparison of the observed time structure with scintillator and RPC
active elements will be presented, which provides insight into the differences
in sensitivity to certain aspects of hadronic showers depending on readout
technology.Comment: 8 pages, 6 figures, proceedings for CHEF2013, Paris, France, April
201
Silicon Photomultipliers in Particle and Nuclear Physics
Following first large-scale applications in highly granular calorimeters and
in neutrino detectors, Silicon Photomultipliers have seen a wide adoption in
accelerator-based particle and nuclear physics experiments. Today, they are
used for a wide range of different particle detector types, ranging from
calorimeters and trackers to particle identification and veto detectors, large
volume detectors for neutrino physics and timing systems. This article reviews
the current state and expected evolution of these applications, highlighting
strengths and limitation of SiPMs and the corresponding design choices in the
respective contexts. General trends and adopted technical solutions in the
applications are discussed.Comment: 17 pages, 18 figures, review paper published in Nuclear Instruments
and Methods A; v2 correcting a missing figure link in tex
Operational Experience and First Results with a Highly Granular Tungsten Analog Hadron Calorimeter
Precision physics at future multi-TeV lepton colliders such as CLIC requires
excellent jet energy resolution. The detectors need deep calorimeter systems to
limit the energy leakage also for very highly energetic particles and jets. At
the same time, compact physical dimensions are mandatory to permit the
installation of the complete calorimeter system inside high-field solenoidal
magnets. This requires very dense absorbers, making tungsten a natural choice
for hadron calorimeters at such a future collider. To study the performance of
such a calorimeter, a physics prototype with tungsten absorbers and
scintillator tiles with SiPM readout as active elements has been constructed
and has been tested in particle beams at CERN over a wide energy range from 1
GeV to 300 GeV. We report on the construction and on the operational experience
obtained with muon, electron and hadron beams.Comment: To appear in the conference record of the IEEE Nuclear Science
Symposium and Medical Imaging Conference, Valencia, Spain, October 201
Energy Reconstruction of Hadron Showers in the CALICE Calorimeters
The CALICE collaboration has constructed highly granular electromagnetic and
hadronic calorimeter prototypes to evaluate technologies for the use in
detector systems at the future International Linear Collider. These
calorimeters have been tested extensively in particle beams at CERN and at
Fermilab. We present analysis results for hadronic events recorded at CERN with
a SiW ECAL, a scintillator tile HCAL and a scintillator strip tail catcher, the
latter two with SiPM readout, focusing both on the HCAL alone and on the
complete calorimeter setup. Particular emphasis is placed on the study of the
linearity of the detector response and on the single particle energy
resolution. The high granularity of the detectors was used to perform first
studies of software compensation based on the local shower energy density,
yielding significant improvements in the energy resolution. The required
calibration precision to achieve this resolution, and the effect of calibration
uncertainties, for the CALICE HCAL as well as for a complete hadron calorimeter
at ILC, has been studied in detail. The prospects of using minimum-ionizing
track segments within hadronic showers for calibration are also discussed.Comment: 4 pages, 6 figures, submitted to the conference record of the
IEEE/NSS 2009, Orlando, Florida, USA, October 200
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