January - Physics Department - Cern

Contents:
PH DEPARTMENT NEWSLETTER
-­‐ Editorial……………………………………………………………………………p.2
-­‐ The GBAR Experiment……………...……………………………………...p.4
-­‐ New Arrivals (Staff and Fellows).………………………………….…..p.9
Edition No.10 – January 2013

Editorial
Dear colleagues
2012 has clearly been a fantastic year for CERN and High Energy Physics in general. Of course, the discovery
by ATLAS and CMS of a new particle, whose properties are so far in agreement with the postulated Higgs
Boson at a mass of ~125 GeV/c 2 , has been the most prominent achievement of last year [1,2]. One should
however not forget key milestones which have been passed by other LHC experiments, for example the
first evidence of the rare Bs-­‐>µµ decay by LHCb [3] in agreement (unfortunately!?) with the Standard
Model predicted rate, the measurement of the total and elastic p-­‐p cross sections at 7 and 8 TeV [4] by
TOTEM, the measurement of the forward production of π 0 ’s by LHCf [5] (a key ingredient for high energy
cosmic ray experiments), etc. The proton-­‐lead run has just started a few days ago, but experiments have
already extracted important information and published 6 papers from a few hours test last year, among
which a first measurement of the nuclear modification factor [6].
The non-­‐LHC program was also very productive. The recent SPS Committee (SPSC) was an opportunity to
review the achievements of most non-­‐LHC experiments and I have been truly impressed by what was
presented. For example, at the Antiproton Decelerator, ALPHA has published in Nature [7] the first
observation of resonant quantum transitions in trapped antihydrogen atoms, ATRAP presented at the SPSC
a new measurement of the antiproton magnetic moment with nearly 3 orders of magnitude improvement
[8] and all experiments have made tremendous progress towards new hardware to perform either precise
spectroscopy of antihydrogen (ATRAP, ASACUSA, ALPHA-­‐2) or a measurement of the gravitational
properties of antimatter (AEGIS, GBAR). In this issue, you will actually find a short paper written by the
GBAR spokesperson on this new, challenging experiment, which will be performed around the ELENA
decelerator starting in 2017.
I could list many other examples on fixed target experiments (NA62 had its first test run, COMPASS-­‐2 made
a successful test run in view of the future DVCS measurements, CLOUD commissioned its expansion system
for droplets and ice formation,…). Note also that in 2012 the CNGS program has been completed, as well
as the DIRAC experiment. Finally, let us not forget ISOLDE who performed a record of 50 experiments and
nTOF, again with a record number of 1.9 10 19 protons on target.
The Theory Unit was extremely active, with one school, four TH institutes and four workshops on site and
welcomed 770 visitors !
Starting mid-­‐February, all experiments and machines will enter into the long shutdown-­‐1 with important
consolidation and hardware preparation activities. This is clearly very different, but not less challenging
work. Data analysis will continue in parallel, using the large data sets accumulated in 2011-­‐12. In 2012,
according to the database, EP produced an amazing record of 375 preprints on experimental results, just
“in front” of TH with 369 preprints! More than one a day in both cases! The competition is open for 2013!
I therefore wish you a happy and productive year.
Philippe
[1] ATLAS Collaboration, “Observation of a new particle in the search for the Standard Model Higgs boson
with the ATLAS detector at the LHC”, Phys. Lett. B 716 (2012) 1, doi:10.1016/j.physletb.2012.08.020,
arXiv:1207.7214.
[2] CMS Collaboration, “Observation of a new boson at a mass of 125 GeV with the CMS experiment at the
LHC”, Phys. Lett. B 716 (2012) 30, doi:10.1016/j.physletb.2012.08.021, arXiv:1207.7235.
[3] LHCb Collaboration, First evidence of the BS-­‐>m+m-­‐ decay arXiv:1211.2674 ; CERN-­‐PH-­‐EP-­‐2012-­‐335
2

[4] TOTEM Collaboration, A luminosity-­‐independent measurement of the proton-­‐proton total cross-­‐section
at sqrt(s) = 8 TeV CERN-­‐PH-­‐EP-­‐2012-­‐354.
[5] LHCf Collaboration, arXiv:1205.4578; CERN-­‐PH-­‐EP-­‐2012-­‐145
[6] ALICE Collaboration Transverse Momentum Distribution and Nuclear Modification Factor of Charged
Particles in p-­‐Pb Collisions at sqrt(sNN) = 5.02 TeV, arXiv:1210.4520 ; CERN-­‐PH-­‐EP-­‐2012-­‐306
[7] Nature 483, 439 (2012) doi:10.1038/nature10942
[8] One-­‐Particle Measurement of the p Magnetic Moment, to be published.
Misc. News:
******************
Fellows and Associates Committee Dates for 2013:
The Selection Committees will take place on 24 May 2013 and 12 November 2013
For May:
-­‐ deadline for applications -­‐ Fellows, 1 March 2013
-­‐ deadline for applications -­‐ Associates, 15 March 2013
For November:
-­‐ deadline for applications -­‐ Fellows, 3 September 2013
-­‐ deadline for applications -­‐ Associates, 13 September 2013
Technical Students Committee Dates for 2013:
The Selection Committees will take place on 23 April 2013 and 1 October 2013
For April:
-­‐ deadline for applications, 5 March 2013
For October:
-­‐ deadline for applications, 12 August 2013
******************
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GBAR - Gravitational Behavior of Antimatter at Rest
The GBAR experiment, proposing a gravity measurement of antihydrogen at the planned ELENA
facility, was approved by the Research Board in May 2012. The collaboration is formed of 14
laboratories and about 40 researchers at present 1 .
The goal of GBAR is to test the Einstein Weak Equivalence Principle (WEP), which states that the
trajectory of a test particle is independent of its composition and internal structure when it is only
submitted to gravitational forces. This fundamental principle has never been directly tested with
antimatter. GBAR will measure the free-fall acceleration g of neutral antihydrogen atoms in the
terrestrial gravitational field directly. [1]
The main principle of GBAR is the use of antihydrogen H + ions (the antimatter equivalent of H –
ions) to more easily manipulate the atoms before measurement. Once produced, the H + ions are
cooled in two stages with lasers and Paul traps to µK temperatures, i.e. a 1 m/s velocity. We then
neutralize them by photo-detachment and let the H atoms fall (Fig. 1). From a 20 cm height the time
of flight is 200 ms, thus easily measured. This is complementary to the method used by the AEGIS
experiment, already in preparation, that will produce a broad beam of Hs at a velocity of about 10 3
m/s and detect tens of µm deviations due to gravity using a deflectometer. Both experiments aim at
a 1% precision in the first phase.
Our method opens the possibility of performing a spectroscopy of H quantum states. Indeed, an
experiment performed ten years ago at ILL Grenoble with ultra cold neutrons by our collaborators
showed that these neutrons, launched a few tens of µm above a plate, were reflected from this
surface by the Casimir effect, and even trapped in the potential resulting from gravity. In such a
potential well the energy levels accessible to the trapped particle are quantized, i.e. the distribution
of the altitudes reached after bouncing on the surface by the particles is quantized. The separation
between these altitude levels is proportional to the acceleration due to gravity. It was calculated that
antihydrogen atoms of low vertical velocity when arriving on such a plate, i.e. launched a few tens
of microns above it, would be reflected with very high probability, allowing thus to use the same
technique to measure g with much higher precision.
Figure 1 – Principle of free-fall measurement (left) and H + production scheme (right).
1 CSNSM Orsay, ETH Zurich, ILL Grenoble, IPCMS Strasbourg, IRFU Saclay, Lebedev Moscow, LKB Paris, JGU
Mainz, NCBJ Otwock-­‐Swierk, RIKEN, Swansea University, University of Tokyo Komaba, Tokyo University of
Science, Uppsala University.
4

Experimental method:
The H + ion is produced through two charge-exchange processes from interactions of p and H with
the same positronium (Ps) target (the positronium is an e + e - bound state):
p + Ps → H + e - (1)
H + Ps → H + + e - . (2)
The first formation cross-section may be enhanced if positronium is slightly excited (n = 2 or 3), for
incident antiproton energies between 1 and 6 keV. Preliminary calculations optimising the time
delays between the antiproton, positron and laser pulses, show that 1⎺H free fall can be detected per
ELENA pulse, i.e every 100 s.
The Ps target itself is formed by the interaction of a positron bunch with a nanoporous SiO2 layer
(Fig. 1 right). We developed a layer that converts more than 30% of the incident 3 keV e + into
orthopositronium (o-Ps) that is released into the vacuum. The o-Ps areal density required to obtain
of the order of 1 H + ion per ELENA pulse, is ~ 10 12 cm -2 . This cannot be accomplished with the β +
emitters such as the 22 Na sources used by the other antihydrogen experiments. Instead, a compact
electron linac produces positrons by pair production in a target with intensity up to 100 times
higher. On the other hand, the antiprotons that are decelerated in a first step to 5 MeV in the AD,
then to 100 keV in ELENA, must be further decelerated to a few keV.
Figure 2 - Schematic illustration of the GBAR experiment. The
MeV and keV values are mean kinetic energies, while the eV and
neV values are dispersions, i.e. temperatures, or quantum levels.
The steps needed to perform the gravitation experiment are sketched in figure 2:
- Production of an intense flux of fast positrons (few MeV) from the interactions on a tungsten
target of a 10-20 MeV electron beam produced in a small accelerator.
- Selection of the positrons and suppression of the electron and gamma background with a
magnetic separator.
- Moderation of the positrons to create so-called “slow” positrons of a few eV.
- Accumulation of the positrons inside a 5 Tesla Penning-Malmberg trap, where they cool down to a
few meV and are then ejected in less than 100 ns onto a porous silica target to form a dense orthopositronium
cloud.
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- Excitation of the o-Ps to gain a large factor on their cross section for the production of H + .
- Interaction with the very low-energy antiproton beam extracted from the Antiproton Decelerator
(AD) followed by the ELENA ring at CERN and an electrostatic decelerator: this produces H
atoms and H + ions.
- Accumulation of the H + ions and sympathetic cooling with 9 Be + ions to 10 μK.
- Photo-detachment at the threshold of the extra positron.
- Measurement of the free fall of the anti-hydrogen atom.
Let us note that the final step reaches energy levels of a few neV, while the original proton beam
that forms the antiprotons in the PS is 26 GeV, i.e about 19 orders of magnitude reduction in
energy!
Ongoing R&D activities:
The most advanced ongoing activities are detailed below, while the other experimental steps are
being prepared at Grenoble, Mainz, Paris, Swansea, Swierk, Tokyo and Zurich. We also have a few
theorists interested in improving particle trapping, studying positron and positronium interactions,
and in the quantum reflection with antimatter.
Figure 3 – (left) schematic and (right) photograph of the decelerator test bench in Orsay.
The antiprotons that will be delivered in 2017 by the Antiproton Decelerator, followed by the
ELENA ring, will have a 100 keV kinetic energy. This is still too high, so that all the present
antihydrogen experiments capture the antiprotons after a degrader into a Penning trap where they
are cooled. In GBAR, we propose to reduce the kinetic energy from 100 keV to 1 keV while
focusing the beam onto the 1 mm diameter tube that will contain the Ps target. The technique is to
rapidly pulse up a beam-tube cavity from -99 kV to 0 kV while the p bunch is inside so that the
antiprotons feel no electric potential gradient when they exit. The idea of decelerating the
antiprotons from 100 keV to 1 keV is to circumvent the losses that occur when using energy
degraders as well as avoiding another Penning trap for accumulation. Such electrostatic
decelerators are routinely used with heavy-ion beams at the CERN-ISOLDE facility. We have set
up a test bench with protons at the CSNSM in Orsay to develop the necessary deceleration and
focusing elements for the antiproton beam pulses. A schematic illustration and photograph are
shown in Fig. 3.
6

Figure 4 – Layout at Saclay (left) and picture of beamline connecting the Penning trap (right).
In order to test positron production and accumulation, we have set up a demonstration apparatus in
Saclay that is based on a small electron linac of 4.3 MeV and 0.14 mA average current running at
200 Hz repetition rate with effective bunch length of 2.5 µs. A primary target is followed with a
tungsten mesh moderator producing 3 × 10 6 slow e + /s. These positrons of a few eV are transported
to a switch where they can be directed either towards a Penning-Malmberg trap for accumulation or
towards a positron annihilation spectrometer (see Fig. 4). In this spectrometer, the e + to Ps
conversion process can be studied in detail.
The trap was transported from the Atomic Physics Laboratory of RIKEN (Japan) and connected to
the slow positron beam line in June 2012. The setup is now ready for systematic tests of the
trapping mechanism that involves cooling the positrons with a preloaded electron plasma.
Once the accumulation of positrons is finished, they are ejected from the trap and dumped onto the
porous silica to be converted into positronium. A laser system is being prepared by LKB in Paris to
excite this Ps cloud. Note that the lifetime of o-Ps being 142 ns, the dump must be performed
quickly and the p, e + and laser beams must be synchronised accordingly.
In the secondary beam line, the slow positrons can be made to interact with material samples that
we want to study for improving the conversion into positronium. BGO crystals detect the gamma
rays emitted in the decay of positronium. The trigger is provided by the secondary electrons emitted
when the incident positron hits the sample to be studied. This scheme was already successfully used
in an ETHZ beam.
GBAR at CERN:
A preliminary layout in the AD Hall is shown in Fig. 5, where the ELENA beam exits the ring to
the left and is transported through two quadrupole doublets to the electrostatic decelerator. The
low-energy antiprotons are then deflected left into the reaction chamber. The linac, shown on the
lower left (surrounded by shielding) is used to create positrons that are sent to the Penning trap
(center) and the accumulated pulse is deflected to the right, into the reaction chamber to form the
positronium cloud. The cylinder on the left houses both the antihydrogen capture and cooling traps,
with the free-fall detector located around. Also visible are two mezzanines that will house the laser
systems for positronium excitation (right) and cooling and photo-detachment (left).
We aim at preparing the elements of the experiments in order to be ready for the first proton or H -
beams that will be used for the commissioning of ELENA in 2016, and take the first antiproton data
in 2017.
7

References:
Figure 5 – Present view of the future layout of the experiment in the CERN AD hall.
[1] G. Chardin et al, Proposal to measure the Gravitational Behaviour of Antihydrogen at Rest GBAR,
CERN-SPSC-P-342, September 2011;
http://cdsweb.cern.ch/record/1386684/files/SPSC-P-342.pdf
8

New Arrivals: (September – December 2012)
Staff:
• Jerome Daguin (PH-­‐DT-­‐DI):
I've been working within the PH/DT cooling project during the last three years as a
cooling engineer. I will continue in the same team under the supervision of Paola
Tropea and my work will be focused on the development, commissioning and
installation of CO2 cooling systems for the future detector upgrades.
• Audrey Deidda (PH-­‐AGS-­‐SE):
I am very glad and enthusiastic to join the AGS secretariat section in order to
provide, together with my colleagues, an efficient administrative support to the
PH Department.
• Jennifer Dembski (PH-­‐AGS-­‐SE):
I joined CERN as an Administrative Student in the Planning & Support Section
which allowed me to gain a good insight into the activities of the organization.
Since October I`ve been working in the CMS Secretariat Team that supports the
CMS Collaboration in all organisational tasks such as preparing meetings &
events, travel, invitation letters and many other tasks. It`s a pleasure to get in
touch with people coming from all over the world and to support the
collaborators in their daily challenges.
• Massimiliano Fiorini (PH-­‐TOT):
I joined the TOTEM Experiment in November, and started working on the
operation and maintenance of the Roman Pot Silicon Detector system. I will also
be active part of the upgrade program, that foresees the development of high
performance silicon sensors for improved space resolution and radiation
hardness combined with state of the art timing detectors.
• Vyacheslav Rychkov (PH-­‐TH)
My current research is devoted to developing new analytical and numerical
approaches to strongly coupled QFT dynamics, in particular the conformal
bootstrap.
9

• Fernando Duarte Ramos (PH-­‐LCD)
• Luis Granado Cardoso (PH-­‐LBC)
• Sylvain Mico (PH-­‐ESE-­‐BE)
• Julien Migne (PH-­‐DT-­‐EO)
• Brian Petersen (PH-­‐ADT-­‐TR)
• Andreas Salzburger (PH-­‐ADP-­‐OS)
• Leonardo Senatore (PH-­‐TH)
• Markus Stoye (PH-­‐CMG-­‐PS
• Lukasz Zwalinski (PH-­‐DT-­‐DI)
Fellows:
• Ricardo Abreu (PH-­‐ADT-­‐TR)
I just rejoined the ATLAS Trigger and Data Acquisition group, where I had already
spent two years in the past. The main focus of my work is on software engineering
within the High Level Trigger and DataFlow projects, which will undergo major
upgrades during the upcoming long shutdown.
• Farah Ben Mimoun Bel Hadj (PH-­‐CMX-­‐DS)
I am an engineer in medical imaging; I worked as a Marie Curie Fellow on the project endoTOFPET-­‐
US with Etiennette Auffray and Paul Lecoq. I am responsible for the assembly and the optimization
of the two detector modules (internal probe and external plate) of the endoscopic PET prototype.
• Monika Blanke (PH-­‐TH)
I recently joined the Theory Group. My research is focused on the theoretical
description of particle physics beyond the Standard Model, including studies of its
signatures at both high-­‐energy and high-­‐precision experiments and in particular
their interplay. Specifically I am interested in models of electroweak symmetry
breaking and their connection to flavor and CP violation.
• Simon de Visscher (PH-­‐CMG-­‐PS)
I'm a physicist, working in the CMS collaboration. A part of my time is dedicated to
experimental studies of particular SM processes and on the improvement of their
modeling with MontCarlo techniques. Besides, I also take part to a Higgs search
and work on algorithms to tag the jets initiated from b-­‐quark production,
potentially from Higgs boson decay.
• Simon Feigl (PH-­‐DT-­‐DI)
I am an Austrian technical physicist and have started as Marie-­‐Curie fellow in the
TALENT network. The work focuses on high-­‐radiation environment technologies.
I am involved in the upcoming ATLAS upgrade (definition and safe execution of
the IBL system integration) as well as in R&D for future high-­‐luminosity systems
(exploring planar HV-­‐CMOS sensors as a promising technology for future tracker
detectors).
10

• Sonia Fernández Pérez (PH-­‐ADE-­‐ID)
I am a physicist. On the 1st September I joined the PH-­‐ADE group under the
supervision of Heinz Pernegger. My research is focusing on the development and
application of the silicon pixel detectors for the ATLAS IBL upgrade.
• Jean-­‐François Fortin (PH-­‐TH)
I work at the boundary between formal quantum field theory and phenomenology
of beyond the Standard Model physics, using concepts from the former to study
the latter. My interests include conformal field theory, supersymmetry breaking,
dark matter detection and model building.
• Rikkert Frederix (PH-­‐TH)
I'm a collider phenomenologist working on Monte Carlo event generation. In particular, I'm
involved in the aMC@NLO project which is a code build within the madgraph framework and allows
for event generation at NLO accuracy.
• Benjamin Fuks (PH-­‐TH)
I work on the computation of QCD corrections for new physics processes and on
the application of resummation techniques to the same processes, the aim being
to reach a higher precision level for the theoretical predictions. I am also involved
in the development of tools dedicated to high-­‐energy physics (FeynRules,
MadAnalysis 5) and am interested in beyond the Standard Model phenomenology
at the LHC.
• Josef Hammer (PH-­‐CMG-­‐CO)
After working as a computer scientist for the CMS L1-­‐Trigger for several years, I
joined CMG-­‐CO in September. My task is to take over all the iCMS tools from Dirk
Samyn (who is about to retire), under supervision of Andreas Pfeiffer. These tools
include the CMS Analysis DB (CADI), the CMS Notes DB, the ESP tools, and plenty
of other tools for the CMS management and secretariat.
• Tim Head (PH-­‐LBD)
I have joined the LHCb experiment. I will be working on searches for processes
which violate lepton flavour conservation and contribute to the studies being
performed for the upgrade of the Velo detector.
11

• Stefan Hohenegger (PH-­‐TH)
I am a fellow in the TH unit working on mathematical aspects of string theory and
quantum field theory.
• Zdenek Hubacek (PH-­‐ADP)
I work on the ATLAS Experiment as a fellow. I will be splitting my working time on
improving the calorimeter simulation (potentially both the precision and the
speed) and on analyzing the 2012 inclusive jets data. I would like to measure the
jet-­‐radius dependence of the inclusive jet cross section.
• Krisztian Krajczar (PH-­‐CMG-­‐PS)
I'm a member of the CMS Collaboration since 2007. After years of working
on soft QCD physics, I moved to learn more about heavy ions around 2010
and was involved in the analysis of particle multiplicity and nuclear
modification factor. As of now I'm working on the new p-­‐Pb data.
• Jochen Meyer (PH-­‐ADE-­‐MU)
In November 2012 I joined the Cern ATLAS Muon group as an applied fellow to
work on muon simulation issues and contribute to performance studies regarding
the ATLAS Muon Spectrometer. Concerning physics analysis my focus is on
(Standard Model) processes including electroweak gauge bosons and in particular
on signatures with muons in the final state.
• Sebastian Neubert (PH-­‐LBD)
I have recently joined the LHCb group at CERN as a research fellow. I'll be studying
the spectroscopy of B and D mesons and search for CP violation in the decays of
these particles. In addition I will work on the high level trigger of LHCb.
• Francois-­‐Xavier Nuiry (PH-­‐DT-­‐EO)
I'm a mechanical engineer and I've already worked for two years in PH-­‐DT-­‐EO
under the VIA fellow program. I'm now CERN fellow and I will continue to
contribute to two detector projects: ATLAS IBL System integration, and LCD
project, testbeam measurements of very forward calorimeter prototypes, as
leading engineer. A part of my activity will also cover general engineering support
for the EO section, particularly for finite element calculations.
12

• Giuliano Panico (PH-­‐TH)
I am a fellow in the theory division. My research efforts are focused on the study
of beyond the Standard Model theories, with the primary aim of understanding
the physics involved in the mechanism of electroweak symmetry breaking. I am
mainly interested theoretical and phenomenological aspects of theories with new
strongly coupled dynamics and theories with extra space-­‐time dimensions.
• Subodh Patil (PH-­‐TH)
I am a theoretical cosmologist working in the Theory Division, having arrived at
CERN on the 1st of September 2012. My research is focused on various aspects of
Cosmology, Gravity and related aspects of String Theory and Beyond the Standard
Model physics.
• Elisa Rapisarda (PH-­‐SME-­‐IS)
I work at ISOLDE, the radioactive beam facility in CERN. My research focuses on
the study of the evolution of the nuclear properties when going far from
stability. I mainly collaborate with the MINIBALL setup, an array of highly
segmented Hyper-­‐Pure Germanium detectors used to study Coulomb excitation
reaction as well as transfer reactions induced by the post-­‐accelerated beam
delivered at ISOLDE.
• Cedric Serfon (PH-­‐ADP-­‐CO)
I joined recently the PH-­‐ADP-­‐CO group (in ATLAS) as applied fellow. I'm working
now on the development of the new version of ATLAS Distributed Data
Management software called Rucio that is supposed to replace the current one
(DQ2) before the end of LS1. I will also be involved in the migration procedure
between DQ2 and Rucio.
• Eva Sicking (PH-­‐LCD)
In November 2012, I have joined the Linear Collider Detector (LCD) group. I
participate in the development of detector concepts for a future electron-­‐
positron collider at the TeV-­‐scale such as the compact linear collider (CLIC). So
far, I am focusing on the analysis of test beam data of a calorimeter prototype
as well as on physics benchmark studies.
.
• Carlos Solans Sanchez (PH-­‐ADE-­‐CA)
I recently joined the ATLAS calorimeter group as Data Preparation coordinator
for the Tile Calorimeter after many years of contributing to the operations as
DAQ expert and Run Coordinator. I devote part of my time to Higgs searches,
initially in the di-­‐tau channel and statistics and more recently in the b-­‐decay
channel.
13

• Giacomo Volpe (PH-­‐AID-­‐DT)
I have started the CERN fellowship on the 1st September 2012 in the PH/AID
Group. I am a member of the ALICE experiment. Currently, I contribute to
ALICE-­‐HMPID detector offline code development and maintenance, data quality
assurance and detector calibration and participate in the HMPID related data
analysis. I pursue physics analysis focusing on hadrons spectra measurements. I
also serve as a Subsystem Run Coordinator for HMPID, organizing the daily
activities & planning for data taking.
• Roberto Auzzi (PH-­‐TH)
• Samir Arfaoui (PH-­‐LCD)
• Luca Barze (PH-­‐TH)
• Joshua Bendavid (PH-­‐CMG-­‐PS)
• Andrea De Simone (PH-­‐TH)
• Juerg Eugster (PH-­‐CMG-­‐PS)
• Dag Gillberg (ADE-­‐CA)
• Alina Grigoras (PH-­‐AIP-­‐SDS)
• Jan Hamann (PH-­‐TH)
• Arno Knapitsch (PH-­‐CMX-­‐DS)
• Mark Kovacs (PH-­‐ESE-­‐FE)
• Adam Martin (PH-­‐TH)
• Thomas Melia (PH-­‐TH)
• Pawel Modrzynski (PH-­‐CMX-­‐DS)
• Mytha Nemallapudi (PH-­‐CMX-­‐DS)
• Lauri Olantera (PH-­‐ESE-­‐BE)
• Vito Palladino (PH-­‐ESE-­‐FE
• Filippo Passerini (PH-­‐TH)
• Kai Schmidt-­‐Hoberg (PH-­‐TH)
• Kristof Schmieden (PH-­‐ADT-­‐TR)
• David Vegh (PH-­‐TH)
• Stefano Venditti (PH-­‐ESE-­‐FE)
• Korinna Zapp (PH-­‐TH)
14