Contact
Name
Jesus Vizan Garcia
Position
Visitor
Member since March 2012
Email
Jesus.Manuel.Vizan.Garciern.ch
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.
Projects
I am involved in the following research directions:

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.

Study and optimization of b-tagging performances in CMS

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.


Show past projects.
Publications in CP3
Showing 5 publications over 13. Show all publications.
All my publications on Inspire

2014

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

Performance of b tagging at sqrt(s)=8 TeV in multijet, ttbar and boosted topology events
The CMS Collaboration
[Full text]
Public experimental note. 26th August.
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.


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Contact : Jérôme de Favereau
Research