[Cugapost] Postdoc position at CEA-Saclay/IPN-Orsay (France)

[Lorelei Chopard]

A 2 year post-doctoral position is opened for application at IRFU

(Institut de Recherche sur les lois fondamentales de l’Univers) at the
CEA Saclay and IPNO (Institut de Physique Nucléaire Orsay) at the
University Paris-Sud at Orsay in the frame of the Laboratory of
Excellence P2IO (Physique des 2 Infinis et des Origines).

Description of the work

The candidate will work on Deeply Virtual Compton Scattering
experiments at COMPASS and JLab. These experiments are the most
promising way to access the Generalized Parton Distribution Functions,
which are interpreted as a tomography of the transverse plane for
partons carrying a given fraction of the proton longitudinal momentum.
The two experiments at COMPASS and JLab allow to get tomography in
complementary kinematic domains: valence quarks at JLab using a 12 GeV
polarized electron beam and sea quarks and gluons at COMPASS using 160
GeV positive and negative polarized muon beams available at CERN.
Presently, a two years (2016-17) DVCS program is performed at COMPASS
while a DVCS experiment has been just realized in 2016 at JLab in Hall
A with the newly available 12 GeV beam and a new one is in preparation
in Hall C for 2020.

During the first year of work (2018) the candidate will participate to
the data analysis of the COMPASS DVCS experiments. The goal is to
determine the absolute cross section with positive and negative muon
beams to extract their sum and difference in order to get to real and
imaginary parts of the Compton form factors (CFF) related to GPDs. In
the second year (2019) the 2016 DVCS data analysis will be mostly
ended and the candidate will use both COMPASS and JLab data to perform
global extraction of GPDs over a wide kinematic range. This will allow
him/her to evaluate dispersion relations on GPDs and to determine with
the measurements of the real and imaginary parts of the CFF the D-term
and shed light on the energy-momentum tensor related to confinement.
He/she would also be able to participate to the preparations and
commissioning of the JLab Hall C experiment.

Working on the analysis of a single process with similar experimental
setups, but at different energies will promote the postdoc to a unique
position with extremely high visibility in both COMPASS and JLab. With
high-impact results published by the end of his/her term, and the
advent of a new Electron Ion Collider, he/she will be in an excellent
position to continue a fruitful career in the field.


Deadline for application is **September 18, 2017**.

The postdoc contract is for two years can start in December 2017 and
no later than beginning of 2018. Please feel free to forward this info
to possible interested party. The applications (including a detailed
CV, a cover letter and two letters of recommendation) are to be sent
to:

- Nicole d’Hose (Nicole.dhose at cea.fr)
- Carlos Munoz Camacho (munoz at ipno.in2p3.fr)

For further information contact Nicole d’Hose or Carlos Munoz Camacho.


Laboratories involved:

- CEA Saclay, DRF/Irfu/DPhN, 91191 Gif-sur-Yvette, France
- Institut de Physique Nucléaire Orsay, 15 rue Georges Clemenceau,
91406 Orsay, France

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