Lamiaa El Fassi
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Lamiaa El Fassi                Assistant Professor

Research Interests: Experimental Nuclear and Particle Physics

I am interested to the study of the internal structure of the strongly interacting particles, hadrons. This research is carried out at Jefferson Laboratory (JLab), Newport News, VA, and Fermi National Laboratory (Fermilab), Batavia, IL. Currently, I am involved in several 6 GeV data analyses projects at JLab that aim to study the Deeply Virtual Compton Scattering off 4He in addition to the meson spectroscopy in the 4He coherent production (EG6 rungroup experiment "internal wiki-page"), extract a high precision nucleon spin structure at very low momentum transfer to test various spin sum rules (EG4 rungroup experiment "internal wiki-page"), and probe the time evolution of elementary configurations of the hadron wave function via the hadronization or fragmentation study of the Λ0 hyperon using the CLAS6 EG2 datasets; the EG2 rungroup combined the Color Transparency (CT) "proposal" & "analysis note" and "Quark or Color Propagation" (CP) experiments. The latter provides a promising method to investigate nucleon and nuclear structure, construct a theory of super-dense nuclear matter, and disentangle the physics of heavy ion collisions that takes place at high temperatures with the creation of a Quark-Gluon Plasma. The ongoing analysis results will be further enriched once the approved CP experiment will accumulate data with the upgraded 12 GeV electron beam energy at JLab. The upcoming CP experiment is expected to take place in concurrence with the 12 GeV CT program (PR12-06-106 "2006 proposal"/"2010 update"). To support the research program of the 12 GeV CLAS (CLAS12, housed in Hall-B at JLab) era, my group leads the developement of the drift chambers calibration and monitoring framework.

On the other hand, my Fermilab research focuses on the Drell-Yan (DY) experiments (Polarized E-1039 and Unpolarized E-906, also dubbed as SeaQuest, experiments). The former polarized DY experiment intends to extract spin dependent quark and anti-quark distributions of the proton and neutron and study the unique behavior of a correlation between the quark/anti-quark spin and angular momenta. In this project, our group is leading the effort to study the poorly known gluon Sivers/Twist-3 transverse momentum distributions using J/Ψ production, develop an advanced graphics processing unit (GPU) based multi-threaded framework that will allow an efficient parallelization of the online data analysis, and maintain the performance of two-station tracking chambers in the detection spectrometer. The latter unpolarized DY measurement aims to extract a more precise anti-quark asymmetry ratio, study the quark propagation and energy loss effects in the cold nuclear matter, target nucleus, before the hard process, di-lepton production, takes place, in addition to the measurement of DY cross sections from several nuclear targets to compare the sea quark distribution in nuclei to that in Deuterium. This comparison will allow an examination of the previously published DY results, which showed no significant modification of the nuclear cross section for longitudinal momentum fraction, x > 0.1, unlike the "anti-shadowing" enhancement observed in the deep inelastic scattering and the European Muon Collaboration (EMC) experiments. The SeaQuest data will be able to address the question of whether the anti-shadowing region and the so-called "EMC" effect (depletion seen for x ~ 0.5) exist in the Drell-Yan process.

Professional Background
Assistant Professor Bridged Position Mississippi State University/Jefferson Laboratory 2014-Present
Post-doctoral Research Associate Old Dominion University/Jefferson Laboratory 2013-2014
Post-doctoral Research Associate Rutgers, The New Jersey State University 2009-2013
Post-doctoral Research Scholar Rutgers, The New Jersey State University 2008-2009
Ph.D. in Experimental Phys. Mohammed V University, Rabat, Morocco jointly with Argonne National Laboratory, Lemont, IL 2008
M.S.  in High Energy Phys. Mohammed V University, Rabat, Morocco 2003
B.S.  in Nuclear Phys. Abdelmalek Essaadi University, Tetouan, Morocco 1999
Curriculum Vitae
Printable Version
Recent Publications
Printable Version
Research Grants and Sponsors

  • Shirsendu Nanda (Ph.D., expected 2022)
    Project: "Calibration of the CLAS12 datasets, and CLAS6/CLAS12 data analyses".

  • Pubuduni Ekanayaka Mudiyanselage Egoda Walawwe (M.S. 2018)
    Project: "Operation and data structure of the CLAS6 spectrometer".
Post-doctoral Associate

Current: 2017 -
  • Hao Jiang (Ph.D 2017, U. of South Carolina)
    Project: Developement of GPU-based multi-threaded framework for online reconstruction and monitoring for the Fermilab Polarized DY, E-1039, experiment.
  • Md Latiful Kabir (Ph.D 2015, U. of Kentucky)
    Project: Developement of CLAS12 DC calibration and monitoring suite, CLAS12 Commissioning, and the analysis of the "12 GeV CT and "6 GeV CP" experiments.

Former: 2014 - 2017
  • Krishna Adhikari (Ph.D 2013, ODU)
    Project: CLAS12 & BoNuS12 ("Barely off-shell Nucleon Structure") tracking and DC calibration software developement, and data analyses of the EG4 rungroup experiment .
Honors and Achievement
  • Jefferson Lab Users Organization, "Elected to serve in the Users Group Board of Directors as the coordinator of the Outreach activities and events", June 2017.
  • Jefferson Lab/Hall-B, "Full membership of the CLAS Collaboration", December 2016.
  • Non Scientific Organization, "Top Female Professional", as a recognition of career accomplishments in physics research and education, October 2015.

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