Stefania Xella

Stefania Xella

Associate Professor

 Personal Information

Name:         Stefania Xella
 Title:            Associate professor (since 2010)
 Address:     Niels Bohr Institute (NBI), Copenhagen University,
                     Blegdamsvej 17, DK-2100, Copenhagen, DK
Email:          xella@nbi.dk
Status:        married, two children (19 and 16). Maternity leave 12
                    months

Significant research appointments

2006 - present : member of the ATLAS experiment at the Large
                            Hadron Collider (LHC), CERN
2013 - present : member of the SHIP experiment at CERN, and the SHIP
                            Institute board
2011 - present : member of the ATLAS trigger and data acquisition Institute
                            Board.
2010 - 2019     : member of the Discovery board (DNF Centre of
                          Excellence in Particle Physics)


2020-2022       : ATLAS Exotics subgroup convenor, Lepton +X analyses
                          (project with ~ 50 people)
2017 - 2019 :  ATLAS trigger coordinator (project with ~ 200 people).
                         Member of the  ATLAS trigger management group,
                         and ATLAS Executive Board.
2015 - 2016 : ATLAS trigger menu coordinator (project with ~ 50 people).
                        Member of the ATLAS trigger management group.
2014 - 2015 : ATLAS trigger release coordinator. Member of the ATLAS trigger
                       steering group.
2011 - 2013 : ATLAS tau reconstruction group (project with ~ 50 people)
                       coordinator. Member of Physics Coordination.
2012 - 2013 : Member of the ATLAS Collaboration Board Chair Advisory group.
2008 - 2011 : ATLAS tau trigger coordinator (project with ~ 20 people).
1999 - 2000 : BaBar Run control coordinator.

 Earlier Research Training

2006 - 2010 : Postdoc at the Niels Bohr Institute, DK. ATLAS experiment.
2003 - 2006 : Postdoc at the University of Zurich, CH. H1 experiment.
1999 - 2003 : Postdoc at the Rutherford Appleton Laboratory, UK. Babar
                     experiment.
1999 - 2000 : Long Term stay at Stanford Linear Accelerator Center (SLAC),
                      USA
1996 - 1999 : PhD in Physics. Niels Bohr Institute, DK.
1989 - 1995 : Master in Physics. 110/110 cum laude. University of Bologna, IT.

Physics analysis interests, selected recent efforts 

Charged-lepton-flavor violatioon at the LHC : a search for decay of the Z boson into a tau-lepton and a light lepton with the ATLAS detector - Submitted, Nature Physics 2021

Search for heavy neutral leptons in decays of W bosons produced in 13 TeV pp collisions using prompt and displaced signatures with the ATLAS detector - JHEP 10 (2019) 65

Search for the lepton-flavor-violating decay of the Z boson into a tau-lepton and a light lepton with the ATLAS detector - Phys.Rev. D98 (2018) 092010

Evidence for Higgs decay into tau leptons - JHEP 1504 (2015) 117

Scientific discoveries I contributed to

• Measurement of CP violation in B decays with the BaBar experiment:
 Phys.Rev.Lett. 87 (2001) 091801, 800+ citations , Phys.Rev.Lett. 89 (2002) 201802, 500+ citations.
• Evidence for the Higgs-boson Yukawa coupling to tau leptons with the ATLAS detector :JHEP 1504 (2015) 117, 200+ citations.

Research review work
2017 - present : Review research proposals for the FCT 2017- SR&TD Project Grants, Science
and Technology Foundation, Portugal (~ review 27 proposals)
2017 - present : Referee for Physics Letter B
2017 - present : Exotics theory contact for Heavy Neutral Lepton searches
2010 - present : Member of several Editorial Boards within the ATLAS experiment
2010 - present : Member of PhD committees in Sweden, Holland, Germany, Denmark, Italy

Publication profile
h-index 165 (https://inspirenet.hep, “find a xella and TC P”), 1075 papers
published, average citations per paper: 119.

Attracted funding
2018 - 2019 : CERN Scientific Associate.
2017 - 2018 : Carlsberg grant for research stay abroad (Melbourne Univ.),
                     11 kEuros.
2014 - 2018 : Research and Innovation fund, YDUN grant, 810 kEuros. One
                       postdoc and two PhD students (co-supported by NBI) hired.
2009 - 2013 : Research and Innovation fund, Women head of research grant,
                        810 kEuros.One postdoc and one PhD student hired.
2008 - 2009 : Copenhagen University FREIA grant. 400 kEuros. Own salary and
                       one PhD student hired.
2005 - 2006 : Swiss National Foundation, Marie Heim Vogtlin, fellowship.
                        Own salary.

Recent conference contributions

Snowmass 2020 meeting for planning USA activities on future collider: Talk on Experimental review of Z,W,t LFV decays.

Workshop on Perspectives and Applications of Deep Learning for Accelerated Scientific Discovery in Physics. Copenhagen University. Organizer.

55th Rencontres de Moriond 2020: Talk on Trigger and data taking in Run2 and prospects in ATLAS

DISCRETE18 6th Symposium on Prospects in the Physics of Discrete: Talk on Symmetries Searches for new phenomena with the ATLAS detector

WIN2017 The 26th International Workshop on Weak Interactions and 
Neutrinos : Talk on Charged Lepton Flavour Violation/Lepton Number Violation searches and studies with the ATLAS experiment

CosPA (2014) 10th Conference in the Symposium on Cosmology and Particle
Astrophysics : Talk on Overview of Higgs properties at ATLAS

Charged-2012 Prospects for Charged Higgs Discovery at Colliders: Talk on Physics object reconstruction in ATLAS: tau, b-jets, Etmiss, etc.

Teaching portfolio

Bachelor level courses : Electromagnetism 1, LynAlys, Introduction to Nuclear and Particle Physics.
Master level courses : Particle Detectors.

Supervision : 6 PhD students (3 female/F, 3 male/M) , 12 master students 
(3 F, 9 M), 8 bachelor students (3 F, 5 M) - since 2008.

 Language skills

italian (mother tongue)
english (very good)
danish (good)
german (basic)

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