Alexander Held

High Energy Physics, statistics, data science / @ATLASexperiment @cern / research scientist @datascience_uw & @iris_hep

[Jay Sandesara @SandesaraJay]

Excited to share the first results using Neural Simulation-Based Inference (NSBI) techniques applied to @ATLASexperiment data! We measure the elusive off-shell Higgs boson with 3.1x better observation sensitivity than standard (histogram) analysis techniques! A thread: (1/N)

[ATLAS Experiment @ATLASexperiment]

Physicists at the ATLAS Experiment at @CERN release a new study of the Higgs boson interacting with top quarks! 🔍

Studies of this rare process can give us insight into the origin of mass. Check out our new briefing to more⤵️ https://t.co/AjDnj6CnQD

[Alexander Held @alheld_]

Come join us! If you have questions you'd like to ask a potential future colleague, please feel free to get in touch. Lots of interesting topics to work on!

[datascience@uw @datascience_uw]

The @KyleCranmer lab at @UWMadison is seeking a postdoctoral research associate to pursue research at the intersection of data science and particle physics. The position could be based either at @CERN or at the Data Science Institute in Madison. https://t.co/7H2in8llzf

[CMS Experiment CERN @CMSExperiment]

📈More than #OpenData, CMS continues to move towards #OpenScience 💪

🎉The statistical analysis tool used to find the #Higgs boson, along with the full statistical model and the data used to make the measurements are now available to all! 🎉

▶️ https://t.co/61zkFCH0bH... @CERN

[Clemens Lange @clelange]

Big day today, stay tuned for what's coming over the next couple of days...

[ATLAS Experiment @ATLASexperiment]

The ATLAS Collaboration celebrates the International Day of #WomenInScience! The collaboration stands with all young women and girls who want to pursue a career in STEM. Here are just some of the women of our collaboration, who are working to push the boundaries of our knowledge.

[Alexander Held @alheld_]

The pyhf workshop started today, looking forward to a productive week!

[pyhf - python HistFactory @pyhf_]

Today's the day! The 2023 #pyhf Users and Developers Workshop begins at CERN at 10:00 CET! We're looking forward to a great week of community interaction, discussion, and development. 🚀

https://t.co/J3k1jWgktZ

[Alexander Held @alheld_]

@Giles_C_Strong @GregorKasieczka @pietrovischia It is! Marcel also wrote an AGC implementation using columnflow (which uses law / luigi): https://t.co/NsMnQ0sN1q. Adoption of such workflow management tools is an active area of discussions and ongoing work.

[Alexander Held @alheld_]

@agbuckley I was curious if a unicode θ̂ might help, but not so much (perhaps I would need to encode it differently though).

[Alexander Held @alheld_]

I am grateful to @datascience_uw and @iris_hep to get to work on projects I am passionate about with an amazing group of people!

[datascience@uw @datascience_uw]

Shoutout to our @datascience_uw postdocs Alex Held @alheld_ & Matthew Feickert @HEPfeickert who work at the intersection of data science and high energy particle physics. Both are @iris_hep leaders engaged with #scikithep, @PyHEPConf & @SciPyConf. #NationalPostdocAppreciationWeek

[Alexander Held @alheld_]

@phi_nate Too many levels could also indicate that a split at a higher level (into a different (sub)section) might make sense.

[Alexander Held @alheld_]

@phi_nate It can be more readable in my opinion to not use numbers with the lowest level subsection, as you are typically still close enough to a higher level (with numbers) for orientation. (Unless those subsections are still multiple pages long.)

[Alexander Held @alheld_]

@l_II_llI @KyleCranmer @HEPfeickert @PyHEPConf @pyhf_ @larrylee @tovaholmes @lukasheinrich_ @kratsg https://t.co/zxoXvcCcw5 provides a Python solution. Reimplementing all the TRExFitter functionality in another language would be a huge project. Translation (of a supported subset) of the config to cabinetry's format seems feasible (unsure how useful).

[Alexander Held @alheld_]

@l_II_llI @KyleCranmer @HEPfeickert @PyHEPConf @pyhf_ @larrylee @tovaholmes @lukasheinrich_ @kratsg Building a JSON directly from TRExFitter config + ROOT histogram inputs would be significantly more work for various reasons. The config also is not quite YAML (but similar), I briefly looked at translating https://t.co/ECOgE6Mq7Z.

[Alexander Held @alheld_]

@l_II_llI @KyleCranmer @HEPfeickert @PyHEPConf @pyhf_ @larrylee @tovaholmes @lukasheinrich_ @kratsg TRExFitter to pyhf works already by translating at the workspace level: https://t.co/11asvqONKq (requires ATLAS permissions to view).

[PyHEP @PyHEPConf]

Now that we're back from the break at #PyHEP2022, we have a talk on end-to-end physics analysis with Open Data: the Analysis Grand Challenge by @alheld_. https://t.co/UAc3Qt9xGo https://t.co/k2Rb2NhkEs

[Alexander Held @alheld_]

@HEPfeickert @iris_hep Thanks for the kind words! I am grateful to be able to showcase this project, which is made possible by the many people working on the facilities, services, and libraries we are using.

[PyHEP @PyHEPConf]

The call for abstracts and registration for #PyHEP2022 is open! The workshop will be online from 12-16, September 2022, registration is free, and we're excited to share new work in the HEP Python community with you. 🐍 Register now! https://t.co/vgD2nSaWDm

[Alexander Held @alheld_]

@fringetracker @animate This came to mind: https://t.co/HNa1Rg9xYx (though looks like it may not be maintained anymore).

[Lukas Heinrich @lukasheinrich_]

🚨 !! Hiring !! 🚨I'm excited to open up both Postdoc and PhD positions to work with me @TUM on Physics and ML/Data Science in Particle Physics with the @ATLASexperiment. Please share widely and/or DM me for details!
https://t.co/raisDbtysg
https://t.co/w0J8oUeyCp