Contact
Name
Giacomo Bruno
Position
Professor
Email
giacomo.brunclouvain.be
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 3215
Office
UCL member card
People responsibilities
Research scientists
Andres Tanasijczuk, member since January 2016
Computing support, Grid computing, CMS Remote Analysis Builder software.

Postdocs
Claudio Caputo (IISN), member since April 2017

Marco Musich, member since June 2015
Experimental particle physicist working with the CMS experiment at the LHC collider of the CERN laboratory. Currently involved in searches for signals of physics beyond the Standard Model and development of detector alignment and calibration techniques.

Jessica Prisciandaro (FNRS), member since January 2018

PhD students
Alessio Magitteri,
I work in CMS Experiment. I am working on H->ZZ->llvv topology and I am involved in hight energy muon reconstruction.

Jože Zobec (UCL-FSR), member since November 2014
I am working on the long-lived exotic particles with the CMS group. My other more technical interest, unrelated to my work is high-performance computing. Appart from that I really do enjoy cooking, singing and playing board games.

Master students
Domitien Bertrand, member since September 2017

Former members
Suzan Basegmez (IISN), PhD student in CP3 from November 2008 to November 2012

Juan Cabrera (IISN), Research scientist in CP3 from April 2012

Michele Gabusi (Other), PhD student in CP3

Valentin Goffinet, Master student in CP3

Pavel Jez (UCL), Visitor in CP3 from March 2012 to June 2015

Victor Le Maire, Master student in CP3 from October 2009

Dany Lockman, Master student in CP3 from October 2009

Claude Nuttens (FRIA), PhD student in CP3 from October 2009 to December 2014

Davide Pagano (FNRS), Postdoc in CP3 from January 2010 to September 2014

Lucia Perrini (FRIA), PhD student in CP3 from January 2012 to October 2015

Loïc Quertenmont (COFUND), Postdoc in CP3 from September 2006 to May 2015

Vincent Roberfroid, Postdoc in CP3
Current position: Callataÿ & Wouters.

Thomas Scaffidi, Master student in CP3 from July 2010 to August 2010

Manuel Tondeur, Master student in CP3

Research statement
Giacomo Bruno is an experimental particle physicist doing research with the CMS experiment at the LHC collider of the CERN laboratory.

His current physics interests are in searches for signals of physics beyond the Standard Model and in measurements related to the recently discovered, Higgs-like, 125 GeV boson: di-tau Higgs decay (associated production of standard model Higgs and exotic Higgs particles), massive long-lived charged particles, heavy resonances decaying into leptons, and baryon number violation. He is also involved in the development of some of the basic tools necessary for these physics data analyses like muon momentum measurement, tau identification, particle identification with ionization energy loss, and matrix elements techniques. He is responsible of the Belgian "Tier2" computing project in the context of the World LHC Computing Grid.

For several years he had contributed to the construction of the CMS detector and its related infrastructure. The main contributions were in the following areas: research and development of the RPC gaseous detectors, design of the CMS muon trigger, and CMS software development for online data acquisition, physics data analysis infrastructure and configuration/monitoring/calibration of the silicon strip tracker detector. He has recently joined the silicon strip tracker upgrade effort.
Projects
I am involved in the following research directions:

#### 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.

#### Higgs bosons to ZZ -> 2l 2nu and measurement of the Higgs natural width

The final state containing two Z bosons decaying into a pair of leptons and a pair of neutrinos has been exploited by the CMS experiment at the LHC to produce a number of results related to the Higgs boson, including measurements of related standard model cross sections.

Constraints have been set on the total width of the 125 GeV Higgs boson, using its relative on-shell and off-shell production and decay rates to a pair of Z bosons, where one Z boson decays to an electron or muon pair, and the other to an electron, muon, or neutrino pair. The analysis is based on the data collected by the CMS experiment at the LHC in 2011 and 2012. A simultaneous maximum likelihood fit to the measured kinematic distributions near the resonance peak and above the Z-boson pair production threshold leads to an upper limit on the Higgs boson width of < 22 MeV at a 95% confidence level, which is 5.4 times the expected value in the standard model at the measured mass of 125.6 GeV.

A search for heavy Higgs bosons in the H → ZZ → 2l2ν decay channel, where l = e or µ, has also been performed using data collected in 2015 at the center of mass energy of 13 TeV. No significant excess is observed above the background expectation. The results are interpreted to set exclusion limits on a number of extensions of the standard model scalar sectors: models with an additional electroweak singlet, as well as Type-I and Type-II two-Higgs doublets models.

External collaborators: CMS collaboration.

#### Particle Identification with ionization energy loss in the CMS experiment at the LHC

The CMS detector at the LHC can be used to identify particles via the measurement of their ionization energy loss. The sub-detectors that have provided so far useful information for this experimental technique are the silicon strip tracker and the pixel detectors. Identification of low momentum hadrons and detection of new exotic massive long-lived charged particles have all benefited from this experimental method. Members of UCL pioneered this technique in the early LHC times and have been developing the tools for its use and calibration. Since 2010 particle identification with ionization energy loss has been the basis of the CMS inclusive search for new massive long-lived charged particles, which has been providing the most stringent and model-independent limits existing to date on any model of new physics predicting such particles.

External collaborators: CMS collaboration.

#### Reconstruction of high energy muons in the CMS experiment at the LHC

The detection of TeV muons is a fundamental ingredient of a number of key analyses performed by the CMS experiment at the LHC collider, like the search for new high-mass resonances decaying into di-muons or one muon and one neutrino. Muons with an energy of a few hundred GeV or more experience catastrophic energy losses in the material they traverse. These energy losses have a very significant negative imact on the most important parameters of the muon energy measurement distribution: central value, resolution, and tails.

In order to mitigate these effects, a new muon reconstruction algorithm, called DYnamic Truncation (DYT), has been developed. The DYT identifies the muon position measurements that are produced after a catastrophic energy loss. The inclusion of these measurements in the muon track fit is responsible for the degradation of the muon energy measurement. The identification of such measuremnts is based on the level of incompatibility between the position measurement itself and the expected position obtained using the previous measurements.

#### Search for Higgs bosons in the ll tau tau final state with the CMS experiment at the LHC

A resonance consistent with the stanadard model Higgs boson with mass of about 125 GeV was discovered in 2012 by the CMS and ATLAS experiments at the LHC. Using the available dataset (2011+2012 LHC runs) evidence was later found of the existence of the SM-predicted decay into a pair of tau leptons. The CP3 Louvain group has been involved in the channel where the Higgs boson is produced in association with the Z boson and decays into a pair of tau leptons.

A search for additional Higgs bosons in the general framework of models with two Higgs doublets (2HDM) was then performed by the same CP3 group using the same final state and the full Run-1 data. Models with two Higgs doublets feature a pseudoscalar boson, A, two charged scalars (H+-) and two neutral (h0 and H0) scalars, one of which is identified with the 125 GeV SM-like Higgs resonance. In some scenarios the most favored decay chain for the discovery of the additional neutral bosons is H0-->ZA-->llττ (or llbb). The search was carried out in collaboration with another group in CP3 who looks at the llbb final state and an update is expected using the Run-2 dataset.

#### Search for massive long-lived charged particles with the CMS detector at the LHC

The CMS detector at the LHC is used to search for yet unobserved heavy (mass >100 GeV/c$^2$), long-lived (lifetime > 1 ns), electrically charged particles, called generically HSCPs.
HSCPs can be distinguished from Standard Model particles by exploiting their unique signature: very high momentum and low velocity. These features are a consequence of their high mass and the relatively limited LHC collision energy. Two experimental techniques are used to identify such hypothetical heavy and low-velocity particles: the measurement of the ionization energy loss rate using the all-silicon tracker detector and the time-of-flight measurement with the muon detectors.

UCL members have developed the ionization energy loss identification technique and have lead the CMS HSCP search since 2010, when the first HSCP paper became one of the first published LHC search papers. Updated results, using the 2011 dataset, were then published followed by a comprehensive paper including also searches for fractional and multiply-charged particles published using the full CMS Run-1 dataset. The results obtained by analysing the 2015 Run 2 data at 13 TeV have also been published.

The analysis, which is very inclusive, doesn't find evidence of HSCP. It currently excludes, among various models, the existence of quasi-stable gluinos, predicted by certain realizations of supersymmetry, and Drell-Yan-produced staus with masses lower than about 1.3 TeV and 350 GeV, respectively. These and the other limits set by the analysis are the most stringent to date. The CMS HSCP papers total to date more than 300 citations.

#### 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.

#### CMS Tracker commissioning at the Magnet Test Cosmic Challenge

The so called Magnet Test Cosmic Challenge (MTCC) was the first comprehensive operational and functional test of the CMS experiment. the MTCC took place in the first months of 2006 and was a slice test in which a small fraction of all the CMS detection equipment was operated in the 4 T solenoid of the experiment. Cosmic rays detected in the muon chambers were used to trigger the readout of all detectors in the global CMS data acquisition system. Prior to data taking, the detectors and their readout electronics were tuned and synchronized with dedicated software procedures. Local reconstruction was carried out online and offline in all sub-detectors for event selection and monitoring purposes. Global reconstruction, linking different sub-detectors, was performed mainly offline. A number of monitoring and visualization tools were also used for validation purposes and monitoring. One of the main goals of the MTCC was the validation of the hardware alignment system functionality.
At the MTCC, UCL had a leading role in the preparation, operation and offline data analysis related to the silicon strip tracker detector.

#### FROG: software for detector and event visualization

FROG is a generic framework dedicated to visualize events produced in particle collisions and detected by particle detectors.
It has been written in C++ and use OpenGL cross-platform libraries. It can be used to any particular physics experiment or detector design. The code is very light and very fast and can run on various Operating System. Moreover, FROG is self consistent and does not require installation of ROOT or Experiment software (e.g. CMSSW) libraries on user's computer.
It includes a lot of features based on an unique and powerful principle. Some of the functionalities are listed below :
3D and 2D visualization, graphical user interface, mouse interface, configuration files, production of pictures in various format, integration of personal objects.
One of the FROG application is to display events for one of the most complex physics experiment : the CMS experiment. But it works as well and even faster with smaller experiment like the Gastof detector.

Frog WebSite
CMS TWiki Page

#### Measurement of detector material with particles and application to the Tracker of the CMS experiment at the LHC

The amount and distribution of the material composing a particle detector that measures the trajectories of charged particles must be known with high accuracy for two main reasons: 1) avoid any bias in the measurements of the momentum of charged particles and 2) provide an accurate Monte Carlo simulation of the detector.

A novel method for measuring the material of a generic tracking apparatus has been developed. The method exploits the multiple scattering experienced by charged particles while they sail through the detector. The method relies on the precise position measurement of the crossing points provided by the tracking detectors. The method is completely general and can be applied to any experiment equipped with detectors with good enough space resolution.

The material of the CMS Silicon Strip Tracker has been measured with this technique to a precision at the level of 10%.

#### Reconstruction and identification of hadronic tau decays with CMS at the LHC

The current experimental program of the CMS experiment contains many analyses which look for a lepton in the final state. The decay of Higgs boson into leptons is one of the few decay channels which can be used to observe or exclude a low mass neutral scalar boson that is predicted by the Standard Model as well as by many Beyond SM scenarios. Additionally, the observation of a charged Higgs boson, which for masses below 200 GeV preferably decays into a lepton and a neutrino, would represent a unique clue to both the origin of mass and the deeper symmetries in Nature.
The lepton can be useful also in many other analyses beyond the Higgs sector, e.g. to test the lepton/flavour universality.

Being the heaviest lepton, can decay either to or electron (leptonic '') or to lighter hadrons (hadronic ''). Most of the leptons decay hadronically (65 %). In hadronic decays, there is an odd number of charged hadrons possibly accompanied by neutral hadrons (due to charge conservation), forming together so-called jet. Finally, there is always at least one neutrino (two for leptonic modes) among the decay products.

Given that bulk of decays are non-leptonic, the efficient reconstruction and identification of jets is of crucial importance for the CMS physics program.

At CMS, the decay products are reconstructed from Particle Flow (PF) objects. In the PF approach, the information from all sub-detectors is combined to identify and reconstruct all particles from collision, namely charged and neutral hadrons, photons, muons and electrons. The reconstruction starts from jets.

The main reconstruction algorithm at CMS is "Hadron plus strips" (HPS). It combines PF electromagnetic particles into strips (due to broadening of calorimeter depositions from photon conversions) in order to reconstruct candidates. Those are combined with charged hadrons to reconstruct visible decay products.

Several identification criteria are applied to the candidates: isolation (how much momentum is carried by jet constituents that cannot be associated with decay products) and rejection against electrons and muons. All discriminators exist in cut- or MVA-based form and have several working points with different values of reconstruction efficiency and rejection against fake candidates.

The aim of this project is to maintain and improve the performance of the CMS tau reconstruction and identification algorithms.

#### Search for baryon number violation in events with top quarks

A search for a yet-unobserved baryon number violating top quark decay has been performed using data collected in 2011 and 2012 by the CMS experiment at the LHC. This search was motivated by a theoretical work from the UCL-CP3 phenomenology group, who have noticed that the existence of physics beyond the standard model would imply, under certain conditions, baryon number violation both in the production of top quarks and in their decay process. In the latter case top quarks would decay with a certain branching fraction into a lepton and two jets. The CP3 Louvain experimental group has searched for such decays in a final state containing a pair of top quarks, where the second top quark experiences a SM hadronic decay. No evidence of such an exotic decay has been found and limits have been set at the level of per mille on the branching fraction of the top quark.
More recently, the CP3 Louvain group has been preparing a new search for boosted same sign top quark pairs, possibly accompanied by additional ligh-flavor jets. This is also a signature of baryon number violation. Notable models where such topologies can be realized are supersymmetric ones with R-parity violation.

#### Search for new high-mass resonances decaying into di-muons with the CMS detector at the LHC

The CMS experiment is used to study the di-muon invariant mass spectrum. These spectra allow searches for high-mass unstable particles (resonances) to be performed in a yet unexplored high mass range.

High-mass resonances decaying into muon pairs are predicted in a number of models beyond the Standard Model of the fundamental interactions. Notable examples are heavy neutral gauge bosons predicted by grand unification theories, as well as gravitons arising in the Randall-Sundrum model of extra dimensions.

The first search for high mass resonances was published in JHEP by CMS using the data acquired in 2010. Updated results were produced using part of the 2011 dataset in Summer 2011. By combining di-electron and di-muon data, CMS excluded the existence of resonances predicted by a number of theoretical models with masses below about 2 TeV. These limits are the most stringent to date.
The UCL CP3 group contributed to these two early CMS publications by being one of the three teams of the CMS Collaboration that regularly analyzed new data, optimising the muon isolation criteria and conducting a full study of a mild excess observed in the low-mass region (at ~120 GeV) in both the di-electron and the di-muon channels.

Since 2012 the activity of the UCL-CP3 group is limited to the exploration of a matrix-element approach to this search. Preliminary results show that the exploitation of the full kinematical information of the di-muon events can give some sizable improvements over the classical one that uses just the di-muon invariant mass. In addition, the group develops a new algorithm for measuring the energy of TeV-muons (for details, please read the dedicated project). This algorithm is expected to bring improvements in both the di-muon and single muon+missing energy searches starting from 2014.

#### Simulation of the CMS silicon tracker

The Tracker Simulation group is responsible for the Geant-based simulation of the Pixel and Strip Tracker response, material budget and geometry description.
Members from CP3 are concentrating on various aspects of the validation with data. We also share the convenership of the group.

External collaborators: CMS tracker collaboration.

#### 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

#### 2018

Search for a heavy scalar boson decaying into a pair of Z bosons in the 2ℓ2ν final state
CMS Collaboration

Public experimental note. 5th March.
Search for a new scalar resonance decaying to a pair of Z bosons in proton-proton collisions at $\sqrt(s) =$ 13 TeV
CMS Collaboration

Public experimental note. 5th March.

#### 2017

The Phase-2 Upgrade of the CMS Tracker
CMS collaboration
CERN-LHCC-2017-009 ; CMS-TDR-014
Refereed paper. 13th December.

#### 2016

Search for long-lived charged particles in proton-proton collisions at sqrt(s) = 13 TeV
Khachatryan, Vardan and others
[Abstract] [PDF] [Journal] Submitted to Phys. Rev. D
6th October.
Reconstruction and identification of τ lepton decays to hadrons and ν$_τ$ at CMS
Khachatryan, Vardan and others
[Abstract] [PDF] [Journal]
Refereed paper. 6th October.
Search for Neutral Resonances Decaying into a Z Boson and a Pair of b Jets or Tau Leptons
CMS collaboration
[Abstract] [PDF] [Journal] [Full text] Published in Phys. Lett. B 759 (2016) 369
Refereed paper. 28th April.
Summary results of high mass BSM Higgs searches using CMS run-I data
CMS Collaboration
CMS Physics Analysis Summary CMS-PAS-HIG-16-007,
Public experimental note. 22nd April.
Search for a heavy scalar boson decaying into a pair of Z bosons in the 2ℓ2ν final state
CMS Collaboration
CMS Physics Analysis Summary CMS-PAS-HIG-16-001
Public experimental note. 22nd April.
Searches for Long-lived Charged Particles in Proton-Proton Collisions at √s = 13 TeV
CMS Collaboration
CMS Physics Analysis Summary CMS-PAS-EXO-15-010
Public experimental note. 22nd April.

#### 2015

Search for H/A decaying into Z and A/H, with Z-->ll and A/H-->bb or A/H-->tau tau
CMS Collaboration
CMS-PAS-HIG-15-001
Public experimental note. 1st December.
Constraints on the pMSSM, AMSB model and on other models from the search for long-lived charged particles in proton-proton collisions at sqrt(s) = 8 TeV
Khachatryan, Vardan and others
[Abstract] [PDF] [Journal]
Refereed paper. 10th February.

#### 2014

Reinterpreting the results of the search for long-lived charged particles in the pMSSM and other BSM scenarios
CMS Collaboration

Public experimental note. 1st July.
Search for baryon number violation in top-quark decays
CMS Collaboration
[Abstract] [PDF] [Journal]
Refereed paper. 1st July.
Evidence for the 125 GeV Higgs boson decaying to a pair of tau leptons
CMS Collaboration
[Abstract] [PDF] [Journal]
Refereed paper. 1st July.
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.
Model Independent Framework for Analysis of Scenarios with Multiple Heavy Extra Quarks
Barducci, D. and Belyaev, A. and Buchkremer, M. and Cacciapaglia, G. and Deandrea, A. and others
[Abstract] [PDF] [Journal] To be submitted.
Refereed paper. 4th May.

#### 2013

Searches for long-lived charged particles in pp collisions at sqrt(s)=7 and 8 TeV
CMS Collaboration
[Abstract] [PDF] [Journal] submitted to JHEP
Refereed paper. 6th May.
Search for the standard model Higgs boson decaying to tau pairs produced in association with a W or Z boson with the CMS experiment in pp collisions at \sqrt{s} = 7 and 8 TeV
CMS Collaboration
CMS Physics Analysis Summary, CMS-PAS-HIG-12-053
Public experimental note. 6th May.
Search for the standard model Higgs boson decaying to tau pairs produced in association with a W or Z boson
CMS Collaboration
CMS Physics Analysis Summary, CMS-PAS-HIG-12-051
Public experimental note. 6th May.
Search for baryon number violating top quark decays in pp collisions at \sqrt{s} = 7 TeV
CMS Collaboration
CMS Physics Analysis Summary, CMS-PAS-B2G-12-002
Public experimental note. 6th May.

#### 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

Search for High-Mass Resonances Decaying to Muon Pairs with 40 pb-1 of Collisions Gathered at sqrt(s) = 7 TeV
S. Basegmez, G. Bruno, D. Pagano et al.

Private experimental note. 9th February.
Search for Resonances in the Dilepton Mass Distribution in pp Collisions at sqrt(s) = 7 TeV
The CMS Collaboration
[Abstract] [PDF] [Journal] [Full text] Submitted to JHEP
Refereed paper. 8th February.
Studies of Tracker Material
The CMS Collaboration

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.

#### 2010

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.

#### 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.

#### 2008

Petal Integration for the CMS Tracker End Caps
T. Bergauer, et al.
CMS NOTE-2008/028. Public CMS note (internally peer-reviewed) about the construction of the CMS forward tracker.
Public experimental note. 22nd December.
The Top Quark Analysis Framework
Maria Hansen et al.
Release note on CMS software.
Private experimental note. 22nd December.
The 2008 CMS Computing, Software and Analysis Challenge
The CMS Collaboration
CMS IN-2008/044. 90 pp G. Bruno and L. Quertenmont among the "actual" authors (~40)
Private experimental note. 11th 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)
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.
Search for Heavy Stable Charged Particles with 100 pb-1 and 1 fb-1 in the CMS experiment
The CMS Collaboration
The CMS Collaboration, "Search for Heavy Stable Charged Particles with 100 pb-1 and 1 fb-1 in the CMS experiment", CMS PAS EXO-08-003.
Physics Analysis Summary of an analysis that passed the full CMS approval procedure in april 2008. This document is public and, according to CMS rules, is signed by the whole CMS Collaboration. It is the summary of a much longer CMS analysis note signed by 15 CMS collaborators, among which G. Bruno (co-editor) and L. Quertenmont from UCL.

Public experimental note. 9th December.
Heavy Stable Charged Particles Searches at the LHC
G. Bruno for the ATLAS and CMS Collaborations
G. Bruno, “Heavy Stable Charged Particles Searches at the LHC”, 2008 J. Phys.: Conf. Ser. 110 072005.
Contribution to proceedings. 9th December.

#### 2006

Tau jet reconstruction and tagging with CMS
The CMS Collaboration
[Journal] Published in Eur. Phys. J. C - Particles and Fields, 46, s01, 1–21 (2006)
Public experimental note. 17th February.
CMS technical design report, volume II: Physics performance
S. Assouak, J. L. Bonnet, G. Bruno, J. Caudron, B. de Callatay, J. de Favereau de Jeneret, S. de Visscher, C. Delaere, P. Demin, D. Favart, E. Feltrin, E. Forton, G. Grégoire, S. Kalinin, D. Kcira, T. Keutgen, G. Leibenguth, V. Lemaitre, Y. Liu, D. Michotte, O. Militaru, A. Ninane, S. Ovyn, T. Pierzchala, K. Piotrzkowski, V. Roberfroid, X. Rouby, D. Teyssier, O. van der Aa, M. Vander Donckt and CMS Collaboration
[Journal] Published in J. Phys. G34 (2007) 995-157
Refereed paper. 25th December.

#### 2005

Jet energy correction with charged particle tracks in CMS
Kodolova, Olga and Bruno, G. and Vardanian, I. and Nikitenko, A. and Fano, L.
[Journal] Published in The European Physical Journal C - Particles and Fields C40S2 (2005) 33-42
Refereed paper. 22nd March.
Feasibility study of a XML-based software environment to manage data acquisition hardware devices
Arcidiacono R, et al.
[Journal] Published in Nucl. Instr. and Meth. A546 (2005) 324-329
Refereed paper. 1st July.
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.
Design and test beam performance of substructures of the CMS tracker end caps
Brauer, R. and others
Published in CERN-CMS-NOTE-2005-025
Public experimental note. 14th December.

Contact : Jérôme de Favereau
Research
Job opportunities Postdoctoral Position on the CMS tracker upgrade for HL-LHC
EOS be.h : 10 PhD positions