Contact
Name
Julien Caudron
Position
Former member
PhD student in CP3 from September 2006 to September 2011
Current position: Postdoc at RWTH Aachen.
Past projects
Hide past projects.

I am involved in the following research directions:

#### 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.

#### 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.

Publications in CP3
All my publications on Inspire

#### 2011

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

Expectations for observation of top-quark pair production in the dileptonic final state in early CMS data at √s=10 TeV
J. Caudron for the CMS Collaboration
[Journal] [Full text] Proceedings of TOP2010: 3rd International Workshop on Top Quark Physics
Contribution to proceedings. 31st December.
Measurement of the ttbar cross section in the dileptonic channels with track-jets at 7 TeV
J. Caudron, A. Giammanco, A. Pin, V. Lemaitre
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
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.
Commissioning of Track-Jets with 900 GeV and 2360 GeV data
P. Azzurri, J. Caudron, D. Dobur, A. Hinzmann, T. Klimkovich, S. Lowette
CMS Analysis Note
Private experimental note. 29th July.
Track-Jets Results with √s=7 TeV pp Collisions
J. Caudron, A. Giammanco, A. Hinzmann, T. Klimkovich, P. Azzurri, S. Lowette, D. Dobur
CMS Analysis Note
Private experimental note. 29th July.
Commissioning of TrackJets in pp Collisions at $\sqrt{s} =$ 7 TeV
The CMS Collaboration
CMS Physics Analysis Summary
Public experimental note. 29th July.

#### 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.
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
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
CMS Analysis Note
Private experimental note. 8th July.

#### 2008

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.

Contact : Jérôme de Favereau