ATLAS Deputy Spokesperson

At the ATLAS Week meeting held in October 2022, I was fortunate to be endorsed by the ATLAS Collaboration Board to become Deputy Spokesperson for the ATLAS experiment from 1 Mar 2023 to 28 Feb 2025.

The Department of Physics web site features a short announcement at this link.


ATLAS Highlights for EPS-HEP Conference

I had the pleasure to present the latest physics highlights from the ATLAS experiment at the EPS-HEP conference held from July 26 to July 30, 2021. A total of 26 new results was released for this conference, including the first observation of WWW production and numerous new results in Standard Model, Top, Higgs, and Heavy Ion measurements, as well as searches at the energy frontier and coupling frontier. The talk is available at this link.


ATLAS Physics Coordinator

In February 2019, I was fortunate to be elected by the ATLAS Collaboration Board to become the Deputy Physics Coordinator for the ATLAS experiment from 1 Oct 2019 to 31 Sep 2020, then Physics Coordinator from 1 Oct 2020 to 31 Sep 2021.

The Department of Physics web site features a short announcement at this link.

ATLAS recipes

Phase-II muon ntuple analysis

main instructions for ntuple reader setup at

  • mkdir n010; cd n010
  • kinit
  • git clone ssh://
  • cd muTrigNt_read
  • bash
  • source scripts/ –tag n010 |& tee install.log
  • source scripts/ –clean |& tee setup_area.log
Install MuTrigNtExampleAna to read ntuples:
info at
  • git clone ssh://
  • git clone ssh://
  • git clone ssh://
  • git clone ssh://
  • git clone ssh://
  • rc find_packages
  • rc compile

Find list of ntuples at

Download Zmumu ntuples:

  • rucio get user.alarmstr:user.alarmstr.muTrigNt.n010f.147807.PowhegPythia8_AU2CT10_Zmumu.recon.ESD.e1564_s2988_s3000_r10370_EXT0

Running instructions at

  • run_example_looper -i ~/work/data/n010/user.alarmstr.muTrigNt.n010f.147807.PowhegPythia8_AU2CT10_Zmumu.recon.ESD.e1564_s2988_s3000_r10370_EXT0/user.alarmstr.13598734.EXT0._000001.muTrigNt.root > run1.log
  • run_SingleMuonAnalysis -i ~/work/data/n010/user.asoffa.muTrigNt.n010b.422070.ParticleGun_single_mu_Pt1000.recon.ESD.e5865_s2988_s3000_r8974_EXT0/user.asoffa.12477721.EXT0._000010.muTrigNt.root

Code repository at

ATLAS recipes

General introduction to particle physics

Below are a set of links that provide a basic introduction to particle physics:

More advanced documents about particle physics:

ATLAS recipes

Request and set up an account on NET3

Information about the Northeast Tier 3 center is available at

To request a new account do as follows:

  1. Ask your supervisor to be invited to join the Slack workspace, see
  2. You will receive an email from Slack asking you to “Join Now”, click on that link to create a Slack account.
  3. Generate a public SSH key following
  4. Post your public SSH key on the accounts channel in Slack and request an account, see this example. You should suggest a username (see login in the picture) and also request the zsh Unix shell (not shown in the picture).
  5. Once your SSH key is installed on NET3 you can log in with ssh -Y
  6. For ease of use of NET3, you may want to install the x2goclient which allows you to create a remote desktop, see

Once you are able to login to NET3, you need to set up your account to work on ATLAS. Follow these steps:

  1. Copy a basic zsh setup file to have access to ATLAS software:
    cp ~willocq/example.zshrc ~/.zshrc
  2. If you want to run vanilla ROOT, type:
    lsetup root
  3. To run root, type:
ATLAS recipes

MadGraph + Pythia for multijet event generation

Here is basic information on how to generate multijet events with MadGraph + Pythia at the Northeast Tier 3 center.

Initial setup

  • Create a directory for event generation:
    mkdir -p evgen/MG5
  • Copy job options files and run script:
    cd evgen/MG5
    cp ~willocq/evgen/MG5/MC15.33344*.py .
    cp ~willocq/evgen/MG5/ .

To run

  • Do the following in each new terminal session:
    cd evgen/MG5
    asetup AtlasProduction,,here
  • Create a new subdirectory for each run and execute run script (e.g. for pp > 4b):
    mkdir 4b-test
    cp 4b-test/.
    cd 4b-test

American Physical Society Fellow

I am fortunate to have been named Fellow of the American Physical Society, see


Massachusetts Undergraduate Research Conference

Students Genya Crossman, Boris Stanchev and Gabriel Madigan (former student David Balaban is also pictured) presented their work at the annual Massachusetts Undergraduate Research Conference on April 22, 2016 at UMass-Amherst. Well done Genya, Boris and Gabriel!IMG_2913


LHC Run 1 search for di-Higgs resonances in 4b final state

See the news item at