Field of Interest:hep-ex, nucl-ex
Experiments:CLAS12
Deadline: 2018-04-30
Region: Europe
Job description:
The study of the inner structure of the nucleon is one of the main challenges in hadron physics nowadays. The PHEN group of IPN Orsay carries out experiments at Jefferson Lab (JLab - Virginia, USA), focusing in particular on measurements of exclusive electroproduction reactions, which allow to access the Generalized Parton Distributions (GPDs) of the nucleon. The formalism of GPDs provides a universal description of the structure of the nucleon in terms of its constituents, the quarks and gluons: their spatial and momentum distributions, their contribution to the spin of the nucleon, etc.
Our team has lead a program, very fruitful in terms of results and having a strong impact, of measurements of GPDs at JLab with a 6-GeV electron beam. This program is continuing with the 12-GeV upgrade of JLab, which will increase the kinematic coverage for the study of GPDs. IPN Orsay has contributed to the JLab upgrade by constructing, and recently installing, a neutron detector (Central Neutron Detector, CND) for the Hall-B CLAS12 spectrometer. The CND will allow us to measure neutron GPDs and thus to extract the contributions of the various quark flavors to the GPDs. The reaction that will be studied is the deeply virtual Compton scattering (DVCS) on the neutron: en->e'n'gamma.
The student will have the unique opportunity to participate to the neutron-DVCS data taking (scheduled for January-March 2019) with a deuterium target, CLAS12, and the CND. He:she will then proceed to the data analysis and the extraction of the beam-spin asymmetry for nDVCS. This observable is paramount for the measurement of GPDs and for the extraction of the contribution of the angular momentum of quarks to the nucleon spin.
This project provides a quite complete preparation research activities in hadron physics, as it involves hardware (work on particle detectors), data taking, analysis work, and phenomenology/theory study to interpret the final results.
Several trips to JLab will be required, especially during the data taking stages.
A background in high-energy or nuclear physics is required, along with a good knowledge of the English language and adequate computing skills.
More Information:http://www.adum.fr/as/ed/voirproposition.pl?site=PSaclay&matricule_prop=19373#version
Experiments:CLAS12
Deadline: 2018-04-30
Region: Europe
Job description:
The study of the inner structure of the nucleon is one of the main challenges in hadron physics nowadays. The PHEN group of IPN Orsay carries out experiments at Jefferson Lab (JLab - Virginia, USA), focusing in particular on measurements of exclusive electroproduction reactions, which allow to access the Generalized Parton Distributions (GPDs) of the nucleon. The formalism of GPDs provides a universal description of the structure of the nucleon in terms of its constituents, the quarks and gluons: their spatial and momentum distributions, their contribution to the spin of the nucleon, etc.
Our team has lead a program, very fruitful in terms of results and having a strong impact, of measurements of GPDs at JLab with a 6-GeV electron beam. This program is continuing with the 12-GeV upgrade of JLab, which will increase the kinematic coverage for the study of GPDs. IPN Orsay has contributed to the JLab upgrade by constructing, and recently installing, a neutron detector (Central Neutron Detector, CND) for the Hall-B CLAS12 spectrometer. The CND will allow us to measure neutron GPDs and thus to extract the contributions of the various quark flavors to the GPDs. The reaction that will be studied is the deeply virtual Compton scattering (DVCS) on the neutron: en->e'n'gamma.
The student will have the unique opportunity to participate to the neutron-DVCS data taking (scheduled for January-March 2019) with a deuterium target, CLAS12, and the CND. He:she will then proceed to the data analysis and the extraction of the beam-spin asymmetry for nDVCS. This observable is paramount for the measurement of GPDs and for the extraction of the contribution of the angular momentum of quarks to the nucleon spin.
This project provides a quite complete preparation research activities in hadron physics, as it involves hardware (work on particle detectors), data taking, analysis work, and phenomenology/theory study to interpret the final results.
Several trips to JLab will be required, especially during the data taking stages.
A background in high-energy or nuclear physics is required, along with a good knowledge of the English language and adequate computing skills.
More Information:http://www.adum.fr/as/ed/voirproposition.pl?site=PSaclay&matricule_prop=19373#version