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Similarity Hashing and Learning for Tracks Reconstruction

Sabrina Amrouche, Tobias Golling, Moritz Kiehn, Andreas Salzburger
2019 Zenodo  
We propose a framework for Similarity Hashing and Learning for Track Reconstruction (SHLTR) where multiple small regions of the detector are reconstructed in parallel with minimal fake rate.  ...  Two major factors impede finding charged particle trajectories from measured hits in the tracking detectors.  ...  Partition strategy : Hashing Neighbors definition : distance 8 For a given query point, ANN returns the nearest neighbors ,i.e whose distances are the smallest.  ... 
doi:10.5281/zenodo.3599393 fatcat:bjezwy6edfdctosvk7lpwzzhbi

MLPF: Efficient machine-learned particle-flow reconstruction using graph neural networks [article]

Joosep Pata, Javier Duarte, Jean-Roch Vlimant, Maurizio Pierini, Maria Spiropulu
2021 arXiv   pre-print
for the high-luminosity LHC.  ...  over rule-based algorithms for granular detectors.  ...  We thank our colleagues in the CMS Collaboration, especially in the Particle Flow, Physics Performance and Datasets, Offline and Computing, and Machine Learning groups, in particular Josh Bendavid, Kenichi  ... 
arXiv:2101.08578v2 fatcat:qsfmn4zvejc7xpxowbozkdptba

Study of quark and gluon jet substructure in Z+jet and dijet events from pp collisions [article]

CMS Collaboration
2021 arXiv   pre-print
Using these measurements, the ability of various models to describe jet substructure is assessed, showing a clear need for improvements in Monte Carlo generators.  ...  The analysis is performed using a data sample of dijet events enriched in gluon-initiated jets, and, for the first time, a Z+jet event sample enriched in quark-initiated jets.  ...  for their contributions to the success of the CMS effort.  ... 
arXiv:2109.03340v1 fatcat:o5ylkfixrbes3barqfle3okp7m

High pT inclusive charged hadron spectra from Au+Au collisions at GeV

Jennifer L. Klay
2003 Nuclear Physics A  
Charged hadron suppression at high p_T is similar in shape and magnitude at all centralities to that observed previously at √(s_NN) = 130 GeV for p_T < 6 GeV/c.  ...  The STAR Collaboration presents new measurements of inclusive charged hadron distributions for p_T < 12 GeV/c from Au+Au collisions at √(s_NN) = 200 GeV.  ...  The √ s N N dependence of charged particle production at midrapidity is shown in Fig. 4 .  ... 
doi:10.1016/s0375-9474(02)01476-8 fatcat:22fwi6wqarcevghe3omb5vfv2i

Transverse momentum spectra and nuclear modification factors of charged particles in Xe-Xe collisions at √(s_ NN) = 5.44 TeV [article]

ALICE Collaboration
2018 arXiv   pre-print
particle multiplicity density 〈dN_ ch/dη〉 show a remarkable similarity at p_ T> 10 GeV/c.  ...  Transverse momentum (p_ T) spectra of charged particles at mid-pseudorapidity in Xe-Xe collisions at √(s_ NN) = 5.44 TeV measured with the ALICE apparatus at the Large Hadron Collider are reported.  ...  The acceptance times tracking efficiency for charged pions, charged kaons and (anti-)protons for 5% most central Xe-Xe collisions is shown in Fig. 1 as a function of the particle transverse momentum  ... 
arXiv:1805.04399v1 fatcat:pfccba6kdvhnvjmj2ng6jobeka

Searches for gluinos and squarks [article]

Tamas Almos Vami
2019 arXiv   pre-print
The search for disappearing tracks extends the gluino mass limit to as much as 2460 GeV, and the neutralino mass limit to as much as 2000 GeV.  ...  In this paper, three searches for strong production Supersymmetry are presented.  ...  A similar plot exists for 2016 as well.  ... 
arXiv:1909.11753v1 fatcat:v6owsdvz5rcl5exhtjbyxlyyzy

Light flavour hadron and inclusive charged particle pT-spectra measured with the ALICE experiment at CERN

P. Ganoti
2019 HNPS Proceedings  
Charged particles are studied in different multiplicity (for pp and p-Pb where available) and centrality classes (for A-A).  ...  Light flavor hadron and inclusive charged particle spectra provide an interesting probe of the particle production mechanisms and the transport properties of QCD matter.  ...  The hashed area in the ratio is the result from hydrodynamical calculations for pions, kaons and protons.  ... 
doi:10.12681/hnps.1800 fatcat:ytv6wve245hjfd7fh2zpplemsq

CTD2020: Tracking performance with ACTS

Xiaocong Ai, For The ACTS Developers
2020 Zenodo  
The reconstruction of charged particles' trajectories is one of the most complex and CPU consuming parts of event processing in high energy experiments, in particular at future hadron colliders such as  ...  The prototype of tracking algorithms for tracking fitting, track seeding and vertex reconstruction are available with the performance currently underin validation.  ...  Osborn's CTD talk) ACTS fast simulation engine is used to generate TrackML Challenge dataset The TrackML dataset is used for various tracking algorithms R&D projects -Similarity Hashing and learning (see  ... 
doi:10.5281/zenodo.4034421 fatcat:pmv25b7wznazvkkymwkskspqte

Performance of a geometric deep learning pipeline for HL-LHC particle tracking

Xiangyang Ju, Daniel Murnane, Paolo Calafiura, Nicholas Choma, Sean Conlon, Steven Farrell, Yaoyuan Xu, Maria Spiropulu, Jean-Roch Vlimant, Adam Aurisano, Jeremy Hewes, Giuseppe Cerati (+12 others)
2021 European Physical Journal C: Particles and Fields  
The pipeline achieves tracking efficiency and purity similar to production tracking algorithms.  ...  Crucially for future HEP applications, the pipeline benefits significantly from GPU acceleration, and its computational requirements scale close to linearly with the number of particles in the event.  ...  [31] , metric learning is used to improve the purity in spacepoints buckets formed using similarity hashing.  ... 
doi:10.1140/epjc/s10052-021-09675-8 fatcat:vy3cu4tzknc7nkufcctfclz3oe

THE ELEMENTAL COMPOSITION OF HIGH-ENERGY COSMIC RAYS: MEASUREMENTS WITH TRACER

P. J. BOYLE
2008 Modern Physics Letters A  
The energy spectra reach energies in excess of 10^14 eV per particle and exhibit nearly the same spectral index (2.65 +/- 0.05) for all elements.  ...  up to 10^15 eV per particle.  ...  We thank the staff of the Columbia Scientific Balloon Facility, the NSF Antarctic Program and the Swedish Space Corporation for support during the balloon campaigns.  ... 
doi:10.1142/s0217732308028260 fatcat:gqskepmoxrfo5edsd2bhvouc5m

Performance of a Geometric Deep Learning Pipeline for HL-LHC Particle Tracking [article]

Xiangyang Ju
2021 arXiv   pre-print
The pipeline achieves tracking efficiency and purity similar to production tracking algorithms.  ...  Crucially for future HEP applications, the pipeline benefits significantly from GPU acceleration, and its computational requirements scale close to linearly with the number of particles in the event.  ...  [31] , metric learning is used to improve the purity in spacepoints buckets formed using similarity hashing.  ... 
arXiv:2103.06995v2 fatcat:d5jsnbocijhc7izr54ugbjskxe

Measurements of differential cross-sections in four-lepton events in 13 TeV proton-proton collisions with the ATLAS detector [article]

ATLAS Collaboration
2021 arXiv   pre-print
Measurements of four-lepton differential and integrated fiducial cross-sections in events with two same-flavour, opposite-charge electron or muon pairs are presented.  ...  The measurements are corrected for detector effects and are compared with state-of-the-art Standard Model calculations, which are found to be consistent with the data.  ...  The ID, immersed in a 2 T axial magnetic field, provides charged-particle tracking for | | < 2.5.  ... 
arXiv:2103.01918v1 fatcat:ixyxn57txbgatngjetevnu4vhu

Inclusive jet spectra in 2.76 TeV collisions from ALICE

Rosi Jan Reed
2013 Nuclear Physics A  
The increased initial production cross section for partons at LHC energies makes fully reconstructed jets available in a wide kinematic range, which allows for a more differential in- vestigation of parton  ...  Measurements of high-pT particle production in heavy-ion collisions at RHIC have shown that medium-induced energy loss affects the partons produced in the early stage of a heavy-ion col- lision.  ...  Both of these algorithms yield very similar results, and indicate that the δp T increased by roughly 50% from δp T calculated by charged tracks only [8] .  ... 
doi:10.1016/j.nuclphysa.2013.02.116 fatcat:v7u44thopvgivix2y6s3oby65q

Measurement of differential cross sections for the production of a Z boson in association with jets in proton-proton collisions at √(s) = 13 TeV [article]

CMS Collaboration
2022 arXiv   pre-print
The jet multiplicity distribution is measured for up to eight jets. The hadronic activity in the events is estimated using the scalar sum of the p_T of all the jets.  ...  All measurements are unfolded to the stable particle-level and compared with predictions from various Monte Carlo event generators, as well as with expectations at leading and next-to-leading orders in  ...  The silicon tracker measures charged particles within the pseudorapidity range |η| < 2.5.  ... 
arXiv:2205.02872v1 fatcat:cyhh4j6uyrcatciiu6mntceq2m

Performance of cryogenic charge readout electronics with the ARGONTUBE LAr TPC

A. Ereditato, D. Goeldi, S. Janos, I. Kreslo, M. Luethi, C. Rudolf von Rohr, M. Schenk, T. Strauss, M.S. Weber, M. Zeller
2014 Journal of Instrumentation  
In this work, we present results on its performance including a comparison of the new cryogenic charge-sensitive preamplifiers with the previously used room-temperature-operated charge preamplifiers.  ...  ARGONTUBE is a liquid argon time projection chamber (TPC) with an electron drift length of up to 5 m equipped with cryogenic charge-sensitive preamplifiers.  ...  The typical amount of charge per readout channel resulting from the track of an ionizing particle in LAr TPCs is of the order of femto-Coulombs.  ... 
doi:10.1088/1748-0221/9/11/p11022 fatcat:5xutidhn5zgw5ca62g7vpp7y3a
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