Raymond Ehlers

Lawrence Berkeley National Laboratory B70-R305

1 Cyclotron Rd

Berkeley, CA 94720

I’m a scientist studying the forces that hold matter together and the physics of the early universe about 1 microsecond after the big bang via high-energy collisions of nuclei, sometimes described as “little bangs”, at the Large Hadron Collider at CERN in Geneva, Switzerland.

More specifically, I’m an experimental physicist with a focus on studying high momentum transfer processes known as jets, with a particular interest in jet substructure. We use these jets as calibrated probes to study quantum chromodynamics (QCD) and the quark-gluon plasma (QGP) formed in heavy-ion collisions. My main research activities include experimentally measuring jet observables as a member of the ALICE (A Large Ion Collider Experiment) collaboration, as well as using these measurements to perform rigorous extractions of fundamental physics parameters via statistical methods (ie. Bayesian inference) as a member of the JETSCAPE collaboration.

news

May 16, 2025	Presented pair of virtual seminars at CTMP
Sep 19, 2024	New paper searching for Moliere scattering with jet substructure
Sep 15, 2024	Delivering plenary talk at Hard Probes 2024
Aug 15, 2024	New paper applying Bayesian inference to hadron and jet data
Feb 27, 2024	Launch of website

latest posts

May 19, 2025	Setting up your software environment: 2025 edition
May 15, 2025	Strong showing from ALICE Jet Working Group at Quark Matter 2025
Feb 27, 2024	A first exercise with jet finding code

selected publications

Bayesian inference analysis of jet quenching using inclusive jet and hadron suppression measurements

JETSCAPE Collaboration, Raymond Ehlers, Yi Chen , et al.

Phys. Rev. C, May 2025

arXiv InspireHEP Bib

@article{JETSCAPE:2024cqe,
  author = {Ehlers, Raymond and Chen, Yi and others},
  collaboration = {JETSCAPE},
  title = {Bayesian inference analysis of jet quenching using inclusive jet and hadron suppression measurements},
  eprint = {2408.08247},
  archiveprefix = {arXiv},
  primaryclass = {hep-ph},
  doi = {10.1103/PhysRevC.111.054913},
  journal = {Phys. Rev. C},
  volume = {111},
  number = {5},
  pages = {054913},
  year = {2025},
  month = may,
  inspire = {2818238},
}

Search for quasi-particle scattering in the quark-gluon plasma with jet splittings in pp and Pb\(-\)Pb collisions at \(\sqrt{s_{\rm NN}}\) = 5.02 TeV

ALICE Collaboration, Shreyasi Acharya, Apar Agarwal , et al.

Sep 2024

Accepted by Phys. Rev. Lett.

arXiv InspireHEP Bib

@article{ALICE:2024fip,
  author = {Acharya, Shreyasi and Agarwal, Apar and others},
  collaboration = {ALICE},
  title = {Search for quasi-particle scattering in the quark-gluon plasma with jet splittings in pp and Pb\(-\)Pb collisions at \(\sqrt{s_{\rm NN}}\) = 5.02 TeV},
  eprint = {2409.12837},
  archiveprefix = {arXiv},
  primaryclass = {nucl-ex},
  reportnumber = {CERN-EP-2024-238},
  month = sep,
  year = {2024},
  inspire = {2831271},
  note = {Accepted by Phys. Rev. Lett.}
}

Measurement of the radius dependence of charged-particle jet suppression in Pb-Pb collisions at \(\sqrt{s_{\mathrm{NN}}}=5.02\) TeV

ALICE Collaboration, Shreyasi Acharya, Dagmar Adamova , et al.

Phys. Lett. B, Feb 2024

arXiv InspireHEP Bib

@article{ALICE:2023waz,
  author = {Acharya, Shreyasi and Adamova, Dagmar and others},
  collaboration = {ALICE},
  title = {Measurement of the radius dependence of charged-particle jet suppression in Pb-Pb collisions at \(\sqrt{s_{\mathrm{NN}}}=5.02\) TeV},
  eprint = {2303.00592},
  archiveprefix = {arXiv},
  primaryclass = {nucl-ex},
  reportnumber = {CERN-EP-2023-027},
  doi = {10.1016/j.physletb.2023.138412},
  journal = {Phys. Lett. B},
  volume = {849},
  pages = {138412},
  month = feb,
  year = {2024},
  inspire = {2637686},
}