Associate Professor, Visiting researcher
Experimental Particle Physics
2100 København Ø
Name: Stefania Xella
Title: Associate professor (since 2010)
Address: Niels Bohr Institute (NBI), Copenhagen University,
Blegdamsvej 17, DK-2100, Copenhagen, DK
Status: married, two children (19 and 16). Maternity leave 12
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
2011 - present : member of the ATLAS trigger and data acquisition Institute
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
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
1999 - 2000 : Long Term stay at Stanford Linear Accelerator Center (SLAC),
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
h-index 165 (https://inspirenet.hep, “find a xella and TC P”), 1075 papers
published, average citations per paper: 119.
2018 - 2019 : CERN Scientific Associate.
2017 - 2018 : Carlsberg grant for research stay abroad (Melbourne Univ.),
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.
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.
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.
italian (mother tongue)
english (very good)