Contact
Name
Vincent Lemaitre
Position
Professor
Director of CP3
Email
vincent.lemaitrclouvain.be
Address
Centre for Cosmology, Particle Physics and Phenomenology - CP3
Université catholique de Louvain
2, Chemin du Cyclotron - Box L7.01.05
B-1348 Louvain-la-Neuve
Belgium
Phone
+32 10 47 3241
Office
E.265
UCL member card
People responsibilities
Research scientists
Jérôme de Favereau (UCL), member since October 2002
CP3 website developement and maintenance, issue tracking system, general support, cluster maintenance, openstack deployement, CMS detector upgrade among other things...

Pavel Demin (UCL),
I'm working for the CMS experiment. My current responsibilities: developing physics analysis software for CMS; heavy flavor jet tagging based on electron identification; enabling computing GRID at UCLouvain/CP3.

Postdocs
Sébastien Brochet, member since March 2015
I'm a postdoctoral researcher in particle physics, member of the CMS collaboration. My main interest is in the search for physics beyond the Standard Model linked to the top quark. For this, I've directly contributed to the search for spin 1 and spin 0 resonances decaying to top-antitop during the Run 1 of the LHC. Currently, I'm working in a model-independent strategy to search for new physics, with concrete applications to the measurement of the ttH coupling, as well as the study of HH resonances.

Visitors
Jesus Vizan Garcia, member since March 2012
Experimental particle physicist working in the CMS experiment. My main activity is the search for the Higgs boson produce in association with a Z boson in the llbb final state. I also work in the optimization of the techniques to identify b-jets.

PhD students
Brieuc François (IISN), member since September 2012
Search for physics beyond the standard model in the llbb+MET topology with CMS data. This study will be extended to the search for the rare process ttH.

Sébastien Wertz (FRIA), member since September 2013
Experimentalist with the CMS collaboration. Searches for non-resonant new physics in the llbb+MET topology (hh and ttbar processes). Also involved in the development of new tools easing the use of the Matrix Element Method.

Former members
Jonathan Allard, Master student in CP3 from September 2008

Camille Beluffi (IISN), Visitor in CP3 from August 2011

Domitien Bertrand, Master student in CP3

Julien Caudron (IISN), PhD student in CP3 from September 2006 to September 2011
Current position: Postdoc at RWTH Aachen.

Séverine Ovyn (UCL), PhD student in CP3 from September 2004 to September 2010
Current position: Manager at Pfease (www.pfease.com).

Arnaud Pin (FRIA), PhD student in CP3 from September 2008 to September 2013

Muriel Vander Donckt (CNRS), Postdoc in CP3 from March 2004 to June 2006
Current position: Assistant Professor Universtité Claude Bernard Lyon I.

Research statement
I am interested in looking for any phenomena Beyond the Standard Model. In particular, in the scalar sector related to the electroweak symmetry breaking.

The search for scalar particles predicted by model Beyond the Standard Model will require at least four conditions:

1) A deep and good understanding of the CMS detector, in particular, the jet or particle flow algorithms and b tagging techniques.

2) The developments of sophisticated analyses techniques, including state of the art event generators such as Madgraph/Madevent with embedded tools such as Madweight.

3) The understanding of top physics as a source of background but also, possibly, a source of signal when the higgs is produced in association with top(s) quarks or if it decays in top quark pairs.

4) A close collaboration with theorists for any possible interpretation of a given observed excess or deficit of events, in a given final state topology.

My research activity is therefore mainly focussed on these four points, with an emphasis on points 2, 3 and 4.

In particular, for point 2, I am taking part to the development of Madweight from the experimental viewpoint, namely, the study of the limitation of the method due to the limited understanding of the so called transfer functions. For point 3, I am particularly interested by the top quark pair production in PP interaction and by the photoproduction of asociated W boson and top quark. In both cases, the fully leptonic topology from the leptonic decays of the two w bosons offer interesting possibilities. Phenomenology of the scalar sector is particularly rich. Together with my theoretical colleagues, the associated possible phenomenology of a two Higgs Doublet Model is under study.

This research is made in very close collaboration with my other experimental colleagues, the CP3 postdocs and last but not least the PhD students which are under my supervision.

Another interest of mine is to maintain an activity in R&D related to silicon detectors. This activity will however decrease with the approaching data taking period of CMS. In this context, I am involved in two projects, the first related to the RD50 collaboration, which concerns the development of Cz silicon detectors which could be good candidates for the CMS tracker upgrade. Another project is related to the development of fundamental semiconductor structures based on the SOI technology, in collaboration with the engineering faculty of the university. My personnal involvement here is somewhat limited to a supervision work, in order to guaranty a good quality of the services related to the irradiation under different beams and doses. These irradiations are being guaranteed by the physicists, engineers and technicians of the Center and of Research of the Cyclotron (CRC) of the university.
Projects
I am involved in the following research directions:

a C++ software package to compute Matrix Element weights: MoMEMta

MoMEMta is a C++ software package to compute Matrix Element weights. Designed in a modular way, it covers the needs of experimental analysis workflows at the LHC. MoMEMta provides working examples for the most common final states (Formula: 0, WW, ...). If you are an expert user, be prepared to feel the freedom of configuring your MEM computation at all levels.
MoMEMta is based on:

- C++, ROOT, Lua scripting language
- Cuba (Monte-Carlo integration library)
- External PDFs (LHAPDF by default)
- External Matrix Elements (currently provided by our MadGraph C++ exporter plugin)

Advanced Multi-Variate Analysis for New Physics Searches at the LHC

With the 2012 discovery of the Higgs boson at the Large Hadron Collider, LHC, the Standard Model of particle physics has been completed, emerging as a most successful description of matter at the smallest distance scales. But as is always the case, the observation of this particle has also heralded the dawn of a new era in the field: particle physics is now turning to the mysteries posed by the presence of dark matter in the universe, as well as the very existence of the Higgs. The upcoming run of the LHC at 13 TeV will probe possible answers to both issues, providing detailed measurements of the properties of the Higgs and extending significantly the sensitivity to new phenomena.

Since the LHC is the only accelerator currently exploring the energy frontier, it is imperative that the analyses of the collected data use the most powerful possible techniques. In recent years several analyses have utilized multi-variate analysis techniques, obtaining higher sensitivity; yet there is ample room for further improvement. With our program we will import and specialize the most powerful advanced statistical learning techniques to data analyses at the LHC, with the objective of maximizing the chance of new physics discoveries.

We are part of a network of European institutions whose goal is to foster the development and exploitation of Advanced Multi-Variate Analysis (AMVA) for New Physics searches. The network offers extensive training in both physics and advanced analysis techniques to graduate students, focusing on providing them with the know-how and the experience to boost their career prospects in and outside academia. The network develops ties with non-academic partners for the creation of interdisciplinary software tools, allowing a successful knowledge transfer in both directions. The network studies innovative techniques and identifies their suitability to problems encountered in searches for new physics at the LHC and detailed studies of the Higgs boson sector.

External collaborators: University of Oxford, INFN, University of Padova, Université Blaise Pascal, LIP, IASA, CERN, UCI, EPFL, B12 Consulting, SDG Consulting, Yandex, MathWorks.

Angular asymmetries in ttW production

We take advantage of the large statistics being recorded by the CMS experiment in Run 2 to launch a systematic study of angular asymmetries in the ttW process, which have a potentially large sensitivity to non-SM effects.
In synergy with the CP3 phenomenology group, we aim at reporting our results in a form that can be easily translated in EFT constraints.

Development of a framework for fast simulation of a generic collider experiment: Delphes

Observability of new phenomenological models in High Energy experiments is delicate to evaluate, due to the complexity of the related detectors, DAQ chain and software. Delphes is a new framework for fast simulation of a general purpose experiment. The simulation includes a tracking system, a magnetic field, calorimetry and a muon system, and possible very forward detectors arranged along the beamline. The framework is interfaced to standard file format from event generators and outputs observable analysis data objects. The simulation takes into account the detector resolutions, usual reconstruction algorithms for complex objects (FastJet) and a simplified trigger emulation. Detection of very forward scattered particles relies on the transport in beamlines with the Hector software.

Search for Higgs boson(s) in CMS at the LHC in the llbb topology

Search for Higgs boson(s) within the Standard Model and beyond and also withing a minimal extension of the scalar sector (2HDM).

The final state under study is a Z decaying into a lepton pair associated with two b-jets. This topology is sensitive to a light SM Higgs via the associate ZH production, as well as a middle mass range SM Higgs boson via the inclusive Higgs production followed by its decay into ZZ with one Z decaying into a lepton pair and the other into bbar.

It is also very sensitive to the production of a non standard heavy Higgs boson decaying into Z plus A (pseudo scalar Higgs boson).

Similar selection (but outside of the Z window) is also sensitive to H->aa->llbb, with "a" a generic light scalar.

External collaborators: CMS collaboration.

Search for non-resonant new physics in ttbar production

The lack of observed resonances produced at the LHC motivates finding new ways of searching for BSM phenomena. This project aims at discovering possible non-resonant New Physics affecting the production of Top quark pairs, by means of a dedicated analysis of data recorded by the CMS experiment. The New Physics effects are modeled using an effective field theory (EFT), whose parameters are to be measured or constrained in a global fit.

The analysis is conducted in close collaboration with phenomenologists to ensure the approach is theoretically sound and future-proof.

Search for nonresonant Higgs boson pair production in the llbb+MET final state

The discovery of a Higgs boson (H) by the ATLAS and CMS experiments fixes the value of the self-coupling λ in the scalar potential whose form is determined by the symmetries of the Standard Model and the requirement of renormalisability. Higgs boson pair production is sensitive to the self-coupling and will play a major role in investigating the scalar potential structure.

This project consists in a search for nonresonant Higgs boson pair production via gluon fusion in the final state with two leptons, two b jets and missing transvere energy – gg → H(bb) H(WW) asking for the leptonic decay of the W's. The analysis is conducted in close collaboration with phenomenologists to ensure the approach is theoretically sound and future-proof.

Search for resonant Higgs pair production in the llbb+MET final state

The recent discovery of a scalar boson compatible with the Standard Model (SM) Higgs boson opened new windows to look for physics beyond the SM (BSM). An example of newly accessible phenomenology is the production of resonances decaying into two SM Higgs bosons (h) predicted by several theory families such as additional Higgs singlet/doublet or warped extra dimension.

This project consists in a search for spin-0 or spin-2 resonances produced via gluon fusion in the final state with two leptons, two b-jets and missing transverse energy – gg → X → h(bb) h(WW) asking for the leptonic decay of the W's. In particular, we are probing a mass range between 260 GeV and 900 GeV.

The CMS silicon strip tracker upgrade

Development of the "phase II" upgrade for the CMS silicon strip stracker.

More precisely, we are involved in the development of the uTCA-based DAQ system and in the test/validation of the first prototype modules. We take active part to the various test-beam campaigns (CERN, DESY, ...)

This activity will potentially make use of the cyclotron of UCL, the probe stations and the SYCOC setup (SYstem de mesure de COllection de Charge) to test the response to laser light, radioactive sources and beams.

The final goal is to take a leading role in the construction of part of the CMS Phase-II tracker.

External collaborators: CRC and CMS collaboration.

World LHC Computing Grid: the Belgian Tier2 project

The World LHC Computing GRID (WLCG) is the worldwide distributed computing infrastructure controlled by software middleware that allows a seamless usage of shared storage and computing resources.

About 10 PBytes of data are produced every year by the experiments running at the LHC collider. This data must be processed (iterative and refined calibration and analysis) by a large scientific community that is widely distributed geographically.

Instead of concentrating all necessary computing resources in a single location, the LHC experiments have decided to set-up a network of computing centres distributed all over the world.

The overall WLCG computing resources needed by the CMS experiment alone in 2016 amount to about 1500 kHepSpec06 of computing power, 90 PB of disk storage and 150 PB of tape storage. Working in the context of the WLCG translates into seamless access to shared computing and storage resources. End users do not need to know where their applications run. The choice is made by the underlying WLCG software on the basis of availability of resources, demands of the user application (CPU, input and output data,..) and privileges owned by the user.

Back in 2005 UCL proposed the WLCG Belgian Tier2 project that would involve the 6 Belgian Universities involved in CMS. The Tier2 project consists of contributing to the WLCG by building two computing centres, one at UCL and one at the IIHE (ULB/VUB).

The UCL site of the WLCG Belgian Tier2 is deployed in a dedicated room close to the cyclotron control room of the IRMP Institute and is currently a fully functional component of the WLCG.

The UCL Belgian Tier2 project also aims to integrate, bring on the GRID, and share resources with other scientific computing projects. The projects currently integrated in the UCL computing cluster are the following: MadGraph/MadEvent, NA62 and Cosmology.

External collaborators: CISM (UCL), Pascal Vanlaer (Belgium, ULB), Lyon computing centre, CERN computing centre.

Past projects
Hide past projects.

I am involved in the following research directions:

Advanced Techniques for Fast Simulation and Data Analysis in High Energy Physics (ASAP)

The discovery of the 125GeV Higgs boson by the LHC experiments has finally opened a new era in the exploration of the TeV scale. The physics programs of CMS and ATLAS aim far beyond the simple discovery, and vigorously pursue the full characterization of the newly discovered state and the full exploration of the TeV scale in search of new phenomena. A key lesson drawn from first two years of LHC running is that most probably first discoveries and then identification of new states/interactions will not be easy. On the one hand, model-independent searches in simple topologies such as single/multi lepton at high transverse momenta have not shown any hint of new physics so far. On the other, topologies with jets and/or missing transverse energies, much more challenging experimentally, do strongly depend on the underlying theoretical models so that efficiently identifying signal enhanced regions of the phase space is quite involved. In this context, multi-variate techniques have become more and more central in the analysis of data from hadron collider experiments, to maximally exploit the information available on the signal and on the backgrounds. Amongst the most advanced techniques and certainly the most powerful one from the theoretical point of view, the so called matrix element method stands out. The main goal of this proposal is to advance the use and the scope of the matrix-element method so to significantly extend the range of physics applications at the LHC to the search of new physics. First we aim at providing the experimental HEP community with complete and automatic simulation tools, such as MadWeight/MoMEMta and Delphes, that overcome the technical limitations of the method. Second we propose to test and apply the new tools to current analyses in signatures that involve final state leptons and b-jets. Finally, we explore new and original applications of the method to both model-dependent or model-independent searches of new physics at the LHC.

External collaborators: CMS collaboration.

Automatic Matrix Element method and associated analyses techniques

Madweight is a algorithm to automatically reweight experimental events with the squared matrix element, and therefore provides the required computation techniques for a practical application of the matrix element method.

We also study the usefullness of MadWeight to estimate differential cross-section Formula: 0 via the marginal distributions of the the experimental weights Formula: 1.

External collaborators: Pierre Artoisenet (Ohio state university).

Early observation of top quark pairs in the dileptonic final state

The top quark is the heaviest elementary particle discovered so far, and many properties related to this quark are still to be understood.
Its observation and mass measurement at Tevatron highlighted the uncommon nature of this quark. The fact that its electroweak decay is faster than the hadronization time scale implies that the top quark exists only as a free quark, so that the effects from new physics should show up very clearly by comparing measurements with the precise Standard Model preditions.
Its "re-discovery" at LHC will be a major milestone for the experiments, since the complexity of the final state demands a fairly good knowledge of the experimental apparatus and a certain degree of control of the backgrounds. Its expected large coupling to Higgs bosons will also be relevaant for the searches for higgs sectors beyond the Standard Model.

External collaborators: CMS collaboration.

Measurement of the b(b)Z process at LHC

At LHC, the Z boson can be produced in association with one or two b-quarks, which is here refereed as b(b)Z production. This process has been seen for the first time at LHC, and measurement of it is an important test of QCD calculations.

For the first time, we observed the Z+b final state and measured of the Z+b/Z+j cross-section ratio in 35.9/pb of pp collisions at 7 TeV, using particle flow jets and simple secondary vertex b-tagging algorithm in the definition of the signal.Emphasis is put on kinematic properties of the jets. With more luminosity, we are working on the measurement of the cross-section for the b(b)Z process, with the identification of one or two b-jets.

External collaborators: A.Gilbert, A.-M.Magnan, A.Nikitenko (Imperial College London); N.Heracleous, A.Perieanu (RWTH Aachen); M.Musich, E.Migliore (University of Torino), and CMS Collaboration.

Observability of a minimal extension of the scalar sectror: 2HDM at the LHC

The goal of this work is to explore the phenomenology of a two Higgs doublet model with a custodial symmetry. It provides topologies that are unusual in the models usually considered in the literature. Notably, it opens the possibility of having an inverted mass spectrum with respect to MSSM with the lightest Higges being a pseudo-scalar and an heavier triplet of charged and neutral higgses.

External collaborators: Simon de Visscher (Zurich university).

Search for Higgs boson(s) in CMS at the LHC in the llbb+MET topology

Search for Higgs boson(s) within the Standard Model and beyond and also withing a minimal extension of the scalar sector (2HDM).

The final state under study is a lepton pair associated with two b-jets and missing transverse energy. This topology is sensitive to a light SM Higgs via the H(bb)H(WW) production (via loop or Higgs self-coupling diagrams) and via the associated production of ttbar pairs and invisible particles. Requiring additional b jets (thus defining the llbbbb+MET final state) allows also the very interesting studies of a standard model Higgs produced in association with a top quark pair and It is also sensitive to the production of non standard heavy Higgs bosons decaying into ZA or WA, in the WAWA and ZAZA channels.

In particular, we are studying both resonant and non-resonant Higgs-pair production.

External collaborators: CMS collaboration.

Silicon strip detectors telescope

Construction of an multiple-plane of silicon strips modules (detectors and readout) as an instrument for particles tracks reconstruction and prototype modules testing.

Validation of a fully automatic matrix element technique for CMS data analyses

The matrix element reweighting method attempts to compute the full likelihood of an observed event given a theoretical model. The method therefore measures the degree of compatibility of the event with the given model using as much information as available. MadWeight is a tool that fully automatize the computation of the event likelihood for any model implemented in MadGraph, by performing phase-space integration and providing a framework for taking into account the experimental resolution on the observed final state objects.
This project aims at validating the matrix element reweighting technique implemented in MadWeight on a number of benchmark searches. In some cases, the final goal is the efficient identification of background events. The final states that are being considered are: Zbb, single top, ttbar resonances and dimuon resonances.

Publications in CP3
All my publications on Inspire

2016

Search for H(WW)H(bb) decays using the 2015 data sample
CMS collaboration
[Full text] prepared for Moriond 2016
Public experimental note. 28th April.

2015

Higgs pair production at the High Luminosity LHC
CMS collaboration
[Full text] CMS-PAS-FTR-15-002
Public experimental note. 29th October.

2014

Study of HH production with H → bb, H → WW → lν lν for an upgraded CMS detector at the HL-LHC
C. Delaere, B. Francois, V. Lemaitre, A. Mertens, M. Vidal Marono
[Full text] CMS AN-2014/141
Private experimental note. 1st December.
Evidence for the direct decay of the 125 GeV Higgs boson to fermions
Chatrchyan, Serguei and others
[Abstract] [PDF] [Journal] Subjects: High Energy Physics - Experiment (hep-ex)
Journal reference: Nature Physics 10 (2014) 557
DOI: 10.1038/nphys3005
Report number: CMS-HIG-13-033, CERN-PH-EP-2014-004

Refereed paper. 1st July.
Measurement of the production cross sections for a Z boson and one or more b jets in pp collisions at $sqrt{s}$ = 7 TeV
Chatrchyan, Serguei and others
[Abstract] [PDF] [Journal] [Full text] Published in JHEP 1406 (2014) 120
Refereed paper. 10th February.

2013

Matrix Element method applied for ttbar estimation in Z(ll)bb analysis.
A. Pin V. Lemaitre C. Beluffi J. Vizan
[Full text] Supporting document for SMP-13-004
Private experimental note. 26th August.
Measurement of the production cross sections of a Z boson in association with b jets in pp collisions at sqrt(s) = 7 TeV
The CMS Collaboration
[Full text] First presented at DIS 2013
Public experimental note. 26th August.
Search for Z(ll)H(bb) using Matrix Element method
A.Pin, T. du Pree, R. Castello, J. Vizan C. Beluffi, A. Caudron, C. Delaere, V. Lemaitre
[Full text] Internal CMS analysis note
Private experimental note. 26th August.
DELPHES 3, A modular framework for fast simulation of a generic collider experiment
de Favereau, J. and others
[Abstract] [PDF] [Journal] Published in JHEP
Refereed paper. 25th July.

2012

Measurement of the Z/gamma*+b-jet cross section in pp collisions at 7 TeV
Chatrchyan, SergueiProg. Part. Nucl. Phys. and others
[Abstract] [PDF] [Journal] [Full text] Published in the Journal of High Energy Physics
Refereed paper. 10th April.

2011

Studies of Tracker Material
The CMS Collaboration
[Full text]
Public experimental note. 8th February.
Search for Heavy Stable Charged Particles in pp collisions at sqrt(s) = 7 TeV
The CMS Collaboration
[Abstract] [PDF] [Journal] Published in JHEP
Refereed paper. 8th February.
Test of Lepton Flavour Universality in K+ → l+ν Decays
CERN NA62 collaboration: C. Lazzeroni et al.
[Abstract] [PDF] [Journal] Submitted to Physics Letters B.
Refereed paper. 27th January.

2010

Measurement of the ttbar cross section in the dileptonic channels with track-jets at 7 TeV
J. Caudron, A. Giammanco, A. Pin, V. Lemaitre
[Full text] Analysis Note 2010/195
Private experimental note. 31st December.
First Measurement of the Cross Section for Top-Quark Pair Production in Proton-Proton Collisions at sqrt(s)=7 TeV
CMS collaboration
[Abstract] [PDF] [Journal] Published in Physics Letters B
Refereed paper. 31st December.
Selection of Top-Like Events in the Dilepton and Lepton-plus-Jets Channels in Early 7 TeV Data
CMS collaboration
[Full text] CMS Physics Analysis Summary
Public experimental note. 31st December.
CMS Tracking Performance Results from early LHC Operation
CMS collaboration
[Abstract] [PDF] [Journal] [Full text] Published in Eur.Phys.J.C70:1165-1192,2010.
Refereed paper. 21st December.
Automation of the matrix element reweighting method
Pierre Artoisenet, Vincent Lemaître, Fabio Maltoni, Olivier Mattelaer
[Abstract] [PDF] [Journal] Published in JHEP12(2010)068
Refereed paper. 19th July.
Search for neutral Higgs bosons decaying into four taus at LEP2
S. Schael and others
[Abstract] [PDF] [Journal] Published in JHEP 1005:049,2010
Refereed paper. 21st June.
Precise Mapping of the Magnetic Field in the CMS Barrel Yoke using Cosmic Rays
Chatrchyan, Serguei and others
[Abstract] [PDF] [Journal]
12th February.
TCT and test beam results of irradiated magnetic Czochralski silicon (MCz-Si) detectors
Luukka, P. and others
[Journal] Published in Nucl. Instrum. Meth. A604:254-257, 2009
Refereed paper. 12th February.

2009

Alignment of the CMS Silicon Tracker during Commissioning with Cosmic Rays
CMS Collaboration
[Abstract] [PDF] [Journal] [Full text] CMS PAPER CFT-09-003
Published in JINST

Refereed paper. 26th December.
Commissioning and Performance of the CMS Pixel Tracker with Cosmic Ray Muons
CMS Collaboration
[Abstract] [PDF] [Journal] [Full text] CMS-CFT-09-001.
Published in JINST

Refereed paper. 26th December.
Commissioning of the CMS Experiment and the Cosmic Run at Four Tesla
CMS Collaboration
[Abstract] [PDF] [Journal] [Full text] Published in JINST
Refereed paper. 21st December.
CMS Data Processing Workflows during an Extended Cosmic Ray Run
CMS Collaboration
[Abstract] [PDF] [Journal] [Full text] Published in JINST
Refereed paper. 21st December.
Commissioning and Performance of the CMS Silicon Strip Tracker with Cosmic Ray Muons
CMS Collaboration
[Abstract] [PDF] [Journal] [Full text] Published in JINST
Refereed paper. 21st December.
Stand-alone Cosmic Muon Reconstruction Before Installation of the CMS Silicon Strip Tracker
CMS Tracker Collaboration (W. Adam et al.).
[Abstract] [PDF] [Journal] [Full text] Published in JINST 4:P05004,2009
Refereed paper. 21st December.
Alignment of the CMS Silicon Strip Tracker during stand-alone Commissioning.
W. Adam et al.
[Abstract] [PDF] [Journal] Published in JINST 4:T07001,2009
Refereed paper. 21st December.
High energy photon interactions at the LHC
J. de Favereau de Jeneret, V. Lemaitre, Y. Liu, S. Ovyn, T. Pierzchala, K. Piotrzkowski, X. Rouby, N. Schul and M. Vander Donckt
[Abstract] [PDF]
Refereed paper. 14th August.
Expectations for observation of top quark pair production in the dilepton final state with the early CMS data at $\sqrt{s} =$ 10 TeV
The CMS Collaboration
[Full text] CMS Physics Analysis Summary
Public experimental note. 8th July.
Track-based measurement of top-quark pair events in the dileptonic channels with the first data of CMS
J. Caudron, A. Giammanco, V. Lemaitre
[Full text] CMS Analysis Note
Private experimental note. 8th July.
Unconventional phenomenology of a minimal two-Higgs-doublet model
Simon de Visscher, Jean-Marc Gerard, Michel Herquet, Vincent Lemaitre, Fabio Maltoni
[Abstract] [PDF] [Journal] Published in JHEP08(2009)042.
Refereed paper. 3rd April.
Delphes, a framework for fast simulation of a generic collider experiment
S. Ovyn and X.Rouby
[Abstract] [PDF] [Full text] Full description of the Delphes framework. Software manual in appendix
7th January.

2008

Petal Integration for the CMS Tracker End Caps
T. Bergauer, et al.
[Full text] CMS NOTE-2008/028. Public CMS note (internally peer-reviewed) about the construction of the CMS forward tracker.
Public experimental note. 22nd December.
The CMS experiment at the CERN LHC
The CMS Collaboration
[Journal] [Full text] The CMS Collaboration, "The CMS experiment at the CERN LHC", 2008 JINST 3 S08004, 361pp doi: 10.1088/1748-0221/3/08/S08004.
Refereed paper. 10th December.
Silicon Strip Tracker Detector Performance with Cosmic Ray Data at the Tracker Integration Facility
J.-L. Bonnet, G. Bruno, B. De Callatay, B. Florins, A. Giammanco, G. Gregoire, Th. Keutgen, D. Kcira, V. Lemaitre, D. Michotte, O. Militaru, K. Piotrzkowski, L. Quertermont, V. Roberfroid, X. Rouby, D. Teyssier et al. (>100 authors)
[Full text] W. Adam et al., "Silicon Strip Tracker Detector Performance with Cosmic Ray Data at the Tracker Integration Facility", CMS NOTE-2008/032.
Public experimental note. 10th December.
The CMS tracker operation and performance at the Magnet Test and Cosmic Challenge
S. Assouak, J.-L. Bonnet, G. Bruno, B. de Callatay, S. de Visscher, D. Favart, B. Florins, E. Forton5, A. Giammanco, G. Gregoire, S. Kalinin, D. Kcira, Th. Keutgen, V. Lemaitre, D. Michotte, O. Militaru, S. Ovyn, K. Piotrzkowski, X. Rouby, D. Teyssier, O. Van der Aa et al. (> 100 authors)
[Journal] [Full text] W. Adam et al., “The CMS tracker operation and performance at the Magnet Test and Cosmic Challenge”, 2008 JINST 3 P07006. doi: 10.1088/1748-0221/3/07/P07006.
G. Bruno co-editor

Refereed paper. 10th December.
High energy photon interactions at the LHC
J. de Favereau et al.
[Abstract] [PDF] [Full text] Submitted. See CP3-09-37.
28th January.
Collider aspects of flavour physics at high Q
del Aguila, F. and others
[Abstract] [PDF] [Journal] Report of Working Group 1 of the CERN Workshop Flavor in the Era of the LHC. Published in Eur.Phys.J.C57:183-308,2008.
Refereed paper. 14th January.

2006

HLT Steering Code Prototype
C. Delaere, V. Lemaitre, O. van der Aa, V. Roberfroid
[Full text] Published in CMS-IN-2006/001, CERN, 2006
Public experimental note. 28th January.
CMS physics: Technical design report
G.L. Bayatian et al. (collaboration CMS)
Published in CERN-LHCC-2006-001
Public experimental note. 2nd February.
The CMS high level trigger
Adam, W. and others
[Abstract] [PDF] [Journal] Published in Eur. Phys. J. C46 (2006) 605-667
Refereed paper. 1st January.
CMS Physics TDR: Volume II (PTDR2), Physics Performance
V. Lemaitre (collaboration CMS)
[Journal] Published in J. Phys. G: Nucl. Part. Phys. 34 995-1579, 2007
Refereed paper. 1st March.
Is Vtb=1?
J. Alwall, R. Frederix, J.-M.Gerard, A. Giammanco, M. Herquet, S. Kalinin, E. Kou, V. Lemaitre, F. Maltoni
[Abstract] [PDF] [Journal] Published in Eur.Phys.J.C.49 (2007) 791
Refereed paper. 29th June.

2005

The effect of highly ionising particles on the CMS silicon strip tracker
W. Adam et al. - 404 authors
[Journal] Published in Nucl. Instr. and Meth. A543 (2005) 463-482
Refereed paper. 11th May.
CMS - The Computing Project - Technical Design Report
V. Lemaitre
Published in CERN-LHCC-2005-023, CMS TDR7, 137 pages
Public experimental note. 15th June.
CM - The Computing Project
V. Lemaitre
Published in CERN-LHCC-023, 137 pages
Public experimental note. 15th June.
Design and test beam performance of substructures of the CMS tracker end caps
R. Brauer et al.
Published in CERN-CMS-NOTE-2005-025
Public experimental note. 27th December.
RD50 status report 2005 : Radiation hard semiconductor devices for very high luminosity colliders
F. Campabadal et al.
Published in CERN-LHCC-2005-37, LHCC-RD-009, Dec 2005, 2005, 113pp
Public experimental note. 14th December.
Search for fermiophobic Higgs at LEP
V. Lemaitre for the ALEPH, DELPHI, L3 and OPAL collaborations
Published in Fundamental Interactions*, 2005, 199-203
Public experimental note. 27th February.
Design and test beam performance of substructures of the CMS tracker end caps
Brauer, R. and others
[Full text] Published in CERN-CMS-NOTE-2005-025
Public experimental note. 14th December.
FP420: An R&D proposal to investigate the feasibility of installing proton tagging detectors in the 420-m region at LHC
M.G. Albrow et al.
Published in CERN-LHCC-2005-025
Public experimental note. 2nd June.
Improved measurement of the triple gauge-boson couplings gamma W W and Z W W in e+ e- collisions
S. Schael et al. (ALEPH Collaboration)
[Journal] Published in Phys. Lett. B614 (2005) 7-26
Refereed paper. 12th May.
Single vector boson production in e+ e- collisions at centre-of-mass energies from 183-GeV to 209-GeV
S. Schael et al. (ALEPH Collaboration)
[Journal] Published in Phys. Lett. B605 (2005) 49-62
Refereed paper. 6th January.


[UCLouvain] - [SST] [IRMP] - [SC] [PHYS]
Contact : Jérôme de Favereau
Research
Job opportunities Summer Students program (Masters) 2017
Summer Student program in CP3 for BAC 3 (2017)
PhD position in NA62 experiment
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