Jesus Vizan Garcia

Former member
Member from March 2012 to February 2015
Research statement
I work in the CMS experiment, where my main contribution is the analysis of the CMS data to search for new physics in the final state characterized by two charged leptons and 2 b-jets in the final state. At this moment, the search for the standard model Higgs produced in association with a Z boson and decaying to a bb pair is the first priority of this activity. To optimize the sensitivity to the Higgs boson signal a sophisticated matrix element technique based on Madweight is being implemented. I also work in the optimization of a multivariate algorithm to identify b-jets, an activity that could potentially benefit a broad range of Phsyics analyses at CMS, in particular Higgs searches in the bb decay mode.
Research directions:
Data analysis in HEP, astroparticle and GW experiments
Detector commissioning, operation and data processing

Experiments and collaborations:

Active projects
Search for Higgs boson(s) in CMS at the LHC in the llbb topology
Agni Bethani, Jérôme de Favereau, Christophe Delaere, Khawla Jaffel, Vincent Lemaitre

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.
Study and optimization of b-tagging performances in CMS
Agni Bethani, Christophe Delaere, Khawla Jaffel

We are involved in the activities of the btag POG (performance object group) of CMS, in release and data validation and purity measurement. We are also interested in btagging in special cases like for colinear b-jets. Furthermore, we are involved in the re-optimization and improvement of the Combined Secondary Vertex (CSV) tagger for the 2012 analyses.

External collaborators: Strasbourg CMS group, CMS collaboration.
Publications in IRMP
All my publications on Inspire

Number of publications as IRMP member: 13
Last 5 publications


CP3-14-40: Evidence for the direct decay of the 125 GeV Higgs boson to fermions
Chatrchyan, Serguei and others

[Abstract] [PDF] [Journal] [Dial]
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. July 1.
CP3-14-13: 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] [Dial] [Full text]
Published in JHEP 1406 (2014) 120
Refereed paper. February 10.


CP3-13-43: Performance of b tagging at sqrt(s)=8 TeV in multijet, ttbar and boosted topology events
The CMS Collaboration

[Full text]
Public experimental note. August 26.
CP3-13-42: 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. August 26.
CP3-13-40: 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. August 26.

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