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Directional detection of Dark Matter with MIMAC: WIMP identification and track reconstruction  [PDF]
J. Billard,F. Mayet,C. Grignon,D. Santos
Physics , 2011, DOI: 10.1088/1742-6596/309/1/012015
Abstract: Directional detection is a promising Dark Matter search strategy. Indeed, WIMP-induced recoils present a direction dependence toward the Cygnus constellation, while background-induced recoils exhibit an isotropic distribution in the galactic rest frame. Taking advantage on these characteristic features and even in the presence of a sizeable background, we show for the first time the possibility to constrain the WIMP properties, both from particle and galactic halo physics, leading to an identification of non-baryonic Dark Matter. However, such results need highly accurate track reconstruction which should be reachable by the MIMAC detector using a dedicated readout combined with a likelihood analysis of recoiling nuclei.
Data acquisition electronics and reconstruction software for real time 3D track reconstruction within the MIMAC project  [PDF]
O. Bourrion,G. Bosson,C. Grignon,J. L. Bouly,J. P. Richer,O. Guillaudin,F. Mayet,J. Billard,D. Santos
Physics , 2011, DOI: 10.1088/1748-0221/6/11/C11003
Abstract: Directional detection of non-baryonic Dark Matter requires 3D reconstruction of low energy nuclear recoils tracks. A gaseous micro-TPC matrix, filled with either 3He, CF4 or C4H10 has been developed within the MIMAC project. A dedicated acquisition electronics and a real time track reconstruction software have been developed to monitor a 512 channel prototype. This autotriggered electronic uses embedded processing to reduce the data transfer to its useful part only, i.e. decoded coordinates of hit tracks and corresponding energy measurements. An acquisition software with on-line monitoring and 3D track reconstruction is also presented.
Data acquisition electronics and reconstruction software for directional detection of Dark Matter with MIMAC  [PDF]
O. Bourrion,G. Bosson,C. Grignon,J. L. Bouly,J. P. Richer,O. Guillaudin,F. Mayet,D. Santos
Physics , 2010, DOI: 10.1016/j.nima.2010.07.035
Abstract: Directional detection of galactic Dark Matter requires 3D reconstruction of low energy nuclear recoils tracks. A dedicated acquisition electronics with auto triggering feature and a real time track reconstruction software have been developed within the framework of the MIMAC project of detector. This auto-triggered acquisition electronic uses embedded processing to reduce data transfer to its useful part only, i.e. decoded coordinates of hit tracks and corresponding energy measurements. An acquisition software with on-line monitoring and 3D track reconstruction is also presented.
Micromegas detector developments for MIMAC  [PDF]
E. Ferrer-Ribas,D. Attié,D. Calvet,P. Colas,F. Druillole,Y. Giomataris,F. J. Iguaz,J. P. Mols,J. Pancin,T. Papaevangelou,J. Billard,G. Bosson,J. L. Bouly,O. Bourrion,Ch. Fourel,C. Grignon,O. Guillaudin,F. Mayet,J. P. Richer,D. Santos,C. Golabek,L. Lebreton
Physics , 2011, DOI: 10.1051/eas/1253020
Abstract: The aim of the MIMAC project is to detect non-baryonic Dark Matter with a directional TPC. The recent Micromegas efforts towards building a large size detector will be described, in particular the characterization measurements of a prototype detector of 10 $\times$ 10 cm$^2$ with a 2 dimensional readout plane. Track reconstruction with alpha particles will be shown.
Micromegas micro-TPC for direct Dark Matter search with MIMAC  [PDF]
F. Mayet,O. Guillaudin,C. Grignon,C. Koumeir,D. Santos,P. Colas,I. Giomataris
Physics , 2009, DOI: 10.1088/1742-6596/179/1/012011
Abstract: The MIMAC project is a multi-chamber detector for Dark Matter search, aiming at measuring both track and ionization with a matrix of micromegas micro-TPC filled with He3 and CF4. Recent experimental results on the first measurements of the Helium quenching factor at low energy (1 keV recoil) are presented, together with the first simulation of the track reconstruction. Recontruction of track of alpha from Radon impurities is shown as a first proof of concept.
Three-dimensional track reconstruction for directional Dark Matter detection  [PDF]
J. Billard,F. Mayet,D. Santos
Physics , 2012, DOI: 10.1088/1475-7516/2012/04/006
Abstract: Directional detection of Dark Matter is a promising search strategy. However, to perform such detection, a given set of parameters has to be retrieved from the recoiling tracks : direction, sense and position in the detector volume. In order to optimize the track reconstruction and to fully exploit the data of forthcoming directional detectors, we present a likelihood method dedicated to 3D track reconstruction. This new analysis method is applied to the MIMAC detector. It requires a full simulation of track measurements in order to compare real tracks to simulated ones. We conclude that a good spatial resolution can be achieved, i.e. sub-mm in the anode plane and cm along the drift axis. This opens the possibility to perform a fiducialization of directional detectors. The angular resolution is shown to range between 20$^\circ$ to 80$^\circ$, depending on the recoil energy, which is however enough to achieve a high significance discovery of Dark Matter. On the contrary, we show that sense recognition capability of directional detectors depends strongly on the recoil energy and the drift distance, with small efficiency values (50%-70%). We suggest not to consider this information either for exclusion or discovery of Dark Matter for recoils below 100 keV and then to focus on axial directional data.
Directional Detection of Dark Matter with MIMAC  [PDF]
J. Billard,F. Mayet,D. Santos
Physics , 2011, DOI: 10.1088/1742-6596/375/1/012008
Abstract: Directional detection is a promising search strategy to discover galactic Dark Matter. We present a Bayesian analysis framework dedicated to Dark Matter phenomenology using directional detection. The interest of directional detection as a powerful tool to set exclusion limits, to authentify a Dark Matter detection or to constrain the Dark Matter properties, both from particle physics and galactic halo physics, will be demonstrated. However, such results need highly accurate track reconstruction which should be reachable by the MIMAC detector using a dedicated readout combined with a likelihood analysis of recoiling nuclei.
Track Reconstruction Performance in CMS  [PDF]
Paolo Azzurri
Physics , 2008, DOI: 10.1016/j.nuclphysbps.2009.10.084
Abstract: The expected performance of track reconstruction with LHC events using the CMS silicon tracker is presented. Track finding and fitting is accomplished with Kalman Filter techniques that achieve efficiencies above 99% on single muons with pT>1 GeV/c. Difficulties arise in the context of standard LHC events with a high density of charged particles, where the rate of fake combinatorial tracks is very large for low pT tracks, and nuclear interactions in the tracker material reduce the tracking efficiency for charged hadrons. Recent improvements with the CMS track reconstruction now allow to efficiently reconstruct charged tracks with pT down to few hundred MeV/c and as few as three crossed layers, with a very small fake fraction, by making use of an optimal rejection of fake tracks in conjunction with an iterative tracking procedure.
Track Reconstruction in the NOvA Experiment  [PDF]
N. Raddatz
Physics , 2011,
Abstract: The NuMI Off-Axis v Appearance (NOvA) experiment is a long baseline neutrino oscillation experiment using a neutrino source created from the NuMI Beamline at Fermilab. The experiment will study the oscillations of muon neutrinos to electron neutrinos using two functionally identical plastic, liquid scintillator filled detectors placed 14 milliradians off-axis to the NuMI beam. Charged current neutrino interactions will be used to observe the neutrino flavor from identification of the final state lepton. Reconstruction of muon charged particle tracks plays an important role in both the short term goals of detector alignment and calibration as well as longer term oscillation analyses through the identification of muon charged current events. A preliminary method of muon track recognition and track fitting based on a Kalman filter is presented.
Track Reconstruction and Alignment with the CMS Silicon Tracker  [PDF]
F. -P. Schilling
Physics , 2006,
Abstract: This report presents recent results on track reconstruction and alignment with the silicon tracker of the CMS experiment at the LHC, obtained with a full detector simulation. After an overview of the layout of the tracker and its material budget, the baseline algorithm for track reconstruction is discussed. The performance of the track reconstruction and its dependence on misalignment is shown. The concept for alignment of the CMS tracker, using a laser alignment system as well as three different track-based alignment algorithms, is presented.
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