Experimental Particle Physics
Blegdamsvej 17, 2100 København Ø, Bygning M og Q, Building: 13-1-Mb4
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 (18 and 15). Maternity leave 12
Current research interests
High energy experimental particle physics, in particular
• ATLAS Trigger system, operation and coordination.
• ATLAS data analysis: Beyond Standard Model effects in lepton
flavour physics; Higgs measurements.
• Technology development for trigger systems, and production of silicon detectors, for the ATLAS experiment at the high luminosity LHC upgrade at CERN
• Design of a new facility: the SHIP experiment at CERN
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)
2017 - 2019 : ATLAS trigger deputy coordinator (2017-18) and coordinator
(2018-19) (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
2015 : Nominated as chair of the ATLAS trigger and data acquisition
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
• 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 - arXiv:1905.09787
• 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 154 (https://inspirenet.hep, “find a xella and TC P”), 1010 papers
published, average citations per paper: 115.
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
DISCRETE18 6th Symposium on Prospects in the Physics of Discrete
Symmetries Searches for new phenomena with the ATLAS detector
WIN2017 The 26th International Workshop on Weak Interactions and
Neutrinos 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 Overview of Higgs properties at ATLAS
Charged-2012 Prospects for Charged Higgs Discovery at Colliders
Physics object reconstruction in ATLAS: tau, b-jets, Etmiss, etc.
Yearly courses : 2 bachelor level courses (Electromagnetism 1, 150 students.
Introduction to Nuclear and Particle Physics, 30 students).
Supervision : 6 PhD students (3 female/F, 3 male/M) , 10 master students
(3 F, 7 M), 7 bachelor students (2 F, 5 M) - since 2008.
italian (mother tongue)
english (very good)