Contact
Name
Ludivine Céard
Position
Former member
PhD student in CP3 from October 2010 to September 2015
Projects
I am involved in the following research directions:

CMS Tracker commissioning and performance assessment

The CMS silicon strip tracker is the largest device of its type ever built. There are 24244 single-sided micro-strip sensors covering an active area of 198m2.
Physics performance of the detector are being constantly assessed and optimized as new data comes.
Members of UCL are playing a major role in the understanding of the silicon strip tracker and in the maintenance and development of the local reconstruction code.

External collaborators: CMS tracker collaboration.

Past projects
Hide past projects.

I am involved in the following research directions:

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.

Publications in CP3
All my publications on Inspire

2014

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

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.
Measurement of the cross section of the production of a Z boson in association with 1, 2, or more b jets at CMS in pp collisions at sqrt(s)=7 TeV.
Tristan du Pree, Roberto Castello, Ludivine Ceard, Anne-Marie Magnan, Andrew Gilbert, Christophe Delaere, Adrien Caudron, Jerome de Favereau
[Full text] CMS internal document supporting CMS-SMP-13-004
Private experimental note. 26th August.

2012

Measurement of the Z/gamma* + bb-jets cross section in pp collisions at sqrt(s) = 7 TeV with the CMS detector
The CMS Collaboration
[Full text] First presented at Moriond 2012
Public experimental note. 23rd May.
Measurement of the Z(ll)+bb cross section at CMS
R. Castello, L. Ceard, C. Delaere, A. Pin, and T.A. du Pree
[Full text] CMS internal document supporting CMS-SMP-12-003
Private experimental note. 23rd May.
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.
Observation of Z+b
The CMS Collaboration
[Full text] Presented first at Moriond 2011
Public experimental note. 9th February.
Leptons efficiency and jets selection for the measurement of Z+b-jet (Z->ll) cross section
R. Castello, L. Ceard, C. Delaere, T.A. Du Pree, A. Gilbert, N.Heracleous, A.M. Magnan
[Full text] Restricted access: CMS internal document supporting CMS paper EWK-11-012
Private experimental note. 9th February.
Aspects of the Z+b cross-section measurement related to b-jet reconstruction
R. Castello, L. Ceard, C. Delaere, T.A. du Pree, A. Gilbert, J. Hauk, N. Heracleous, A.-M. Magnan, E. Migliore, M. Musich, and A. Nikitenko
[Full text] Restricted access: CMS internal document supporting CMS paper EWK-11-012
Private experimental note. 9th February.
Observation of the Z+b final state and measurement of the Z+b/Z+j cross-section ratio in pp collisions at 7 TeV
Tristan du Pree, Ludivine Ceard, Jerome de Favereau, Christophe Delaere
[Full text] Restricted access: CMS internal document supporting CMS PAS-EWK-10-015
Private experimental note. 9th February.

2011

Observation of Z+b, Z -> ee, mumu with CMS at sqrt(s)=7TeV.
The CMS Collaboration
[Full text] Prepared for 2010 Winter Conferences (Moriond)
Public experimental note. 11th March.
Observation of the Z+b final state and measurement of the Z+b/Z+j cross-section ratio in pp collisions at 7 TeV
L. Ceard, J. de Favereau, C. Delaere and T. du Pree
[Full text] CMS analysis note, in relation to EWK-10-015
Private experimental note. 11th March.


[UCLouvain] - [SST] [IRMP] - [SC]
Contact : Jérôme de Favereau
Research
Job opportunities Postdoctoral position: Search for Hidden Sector mediations at NA62 experiment
EOS be.h : 10 PhD positions
Postdoctoral position: Data Analysis and GTK operation for NA62 experiment
Postodoctoral position in precision and BSM Phenomenology
Postdoctoral Position in Precision Computations for the LHC