Oz Amram
LightNews LightNews
banner
ozamram.bsky.social
Oz Amram
@ozamram.bsky.social
180 followers 160 following 49 posts
Postdoc at Fermilab working on working on particle physics + ML with CMS
He/him
https://ozamram.github.io/
Posts Replies Media Videos
ozamram.bsky.social
We had these two striking 8 TeV dijet pairs events in Run 2, resulting in a 3.8sigma local excess

Unfortunately haven't seen any in Run3 yet 🫤
cmspapers.bsky.social CMS Publications @cmspapers.bsky.social · 15d
#CMSPAS: Search for resonant production of pairs of dijet resonances in proton-proton collisions at √s = 13.6 TeV (CMS-PAS-EXO-25-004) https://cds.cern.ch/record/2947130 #NewPhysics
October 27, 2025 at 7:28 PM
Reposted by Oz Amram
tristandupree.bsky.social
CepC proposal will not be included in China’s next 5-year plan

cerncourier.com/cepc-matures...
CEPC matures, but approval is on hold – CERN Courier
The Circular Electron–Positron Collider (CEPC), a 100-km electron–positron “Higgs factory” proposed in China, has reached the technical-design stage but will not be included for approval or constructi...
cerncourier.com
October 26, 2025 at 10:36 AM
ozamram.bsky.social
Very cool new analysis!

Due to the crazy data volume, standard data streams throw away >99.99% of collisions at the LHC

But what if we didn't have to?

For the first time CMS has performed a search using data processed on hardware in real time (40 million / sec) !
cmspapers.bsky.social CMS Publications @cmspapers.bsky.social · Sep 23
#CMSPAS: Search for heavy long-lived charged particles with Level-1 Scouting data from proton-proton collisions at √s = 13.6 TeV (CMS-PAS-EXO-25-010) https://cds.cern.ch/record/2943179 #NewPhysics
September 23, 2025 at 1:31 PM
ozamram.bsky.social
Great thread!
dangaristo.bsky.social Dan Garisto @dangaristo.bsky.social · Sep 15
A few years ago, four theorists identified new symmetries in a two Higgs doublet model. These are not intuitive physical symmetries, like reflection over a mirror, but are abstract ways in which the parameters can be transformed and the model preserved. arxiv.org/abs/2306.02410
List of seven new symmetries for 2HDM We found a set of constraints on 2HDM scalar parameters which is RG invariant to all orders when one considers only scalar and gauge interactions – and which can be invariant to at least two loops if fermions are also included. To do so we analysed the beta-functions of the parameters of the model and discovered fixed points – valid to all orders in scalar and gauge couplings – which correspond to relations between 2HDM parameters which do not coincide with any of the known six symmetries of the SU(2) × U(1) scalar potential. Those relations, given by what we called the r0-symmetry17, are m2 11 + m2 22 = 0 , λ1 = λ2 , λ6 = −λ7 , (6.1) which have also been shown to be basis-invariant.
September 15, 2025 at 8:38 PM
Reposted by Oz Amram
dangaristo.bsky.social
From the most recent one:
"In this letter, we have applied goofy transformations
to the SM, thereby also extending them to include the
fermion sector. We have shown that all SM interactions
are invariant under the appropriate goofy transformations, while the Higgs-mass term is forbidden."
In this letter, we have applied goofy transformations to the SM, thereby also extending them to include the fermion sector. We have shown that all SM interactions are invariant under the appropriate goofy transformations, while the Higgs-mass term is forbidden. Goofy symmetry can thus provide a new means to solve the hierarchy problem. Since, unlike shift symmetry, it is not broken explicitly by SM interactions, goofy symmetry renders a small Higgs mass technically natural in the ’t Hooft sense. We also explored simple goofy-symmetric extensions of the SM, including a scalar singlet, vector-like fermions, and higher-dimensional operators, demonstrating how massive states can emerge via spontaneous goofy symmetry breaking. A typical prediction would be new states related to this symmetry breaking, such as a scalar singlet around the TeV scale. This could also furnish a dark matter candidate. It would be interesting to explore how further puzzles could be addressed in (extensions of) the goofysymmetric SM. Examples are the generation of a viable baryon asymmetry (potentially via an enlarged scalar sector, such as in III A, enhancing the electroweak phase transition), the strong CP problem, the generation of small neutrino masses, and the question of grand unification. Finally, also the mathematical foundations of goofy transformations, including connections to spacetime symmetries, and the mechanism of spontaneous goofy symmetry breaking should be further scrutinized on the way of establishing them as a route in model building. Goofy, in awe of the nominative powers of theoretical physics.
September 15, 2025 at 5:36 PM
ozamram.bsky.social
Recently came across a petition for CERN to reconsider its relationship to Israel in light of the ongoing genocide in Gaza

1300+ signatures and counting

Encourage all my CERN affiliated colleagues to sign!
September 10, 2025 at 8:38 PM
Reposted by Oz Amram
cern.bsky.social
Welcome to the September/October edition of #CERNCourier

In this edition the future meets the past: the ongoing update to the European Strategy for Particle Physics, the outstanding discoveries of 1964, what may be the last chapter of the quarkonia story and much more.

Read more: cerncourier.com
September 9, 2025 at 11:39 AM
Reposted by Oz Amram
aishikghosh.bsky.social
And we're off! Yifan Chen welcomes students to the Machine Learning for Fundamental Physics School 2025!
August 4, 2025 at 3:50 PM
Reposted by Oz Amram
aishikghosh.bsky.social
Now @ozamram.bsky.social discusses simple and advanced anomaly detection techniques in HEP
August 7, 2025 at 9:14 PM
ozamram.bsky.social
If you liked the recent CMS anomaly detection search, check out this paper for more details & validations!

I particularly like this 'rediscovery' of boosted top quarks with anomaly detection!
Left = before AD, right = after AD
Histogram showing jet mass spectrum, dominated by QCD background, ttbar is barely visible Histogram showing jet mass spectrum after anomaly detection, ttbar contribution is clearly visible
July 16, 2025 at 4:28 PM
ozamram.bsky.social
Happy this paper is finally on arxiv!

A fun mix of physics (jet substructure) being used to calibrate the performance of ML algorithms (jet taggers) to get proper uncertainties

Now a standard CMS tool for interpreting searches for exotic jets, used in multiple analyses
cmspapers.bsky.social CMS Publications @cmspapers.bsky.social · Jul 12
#CMSpaper: A method for correcting the substructure of multiprong jets using the Lund jet plane (arXiv:2507.07775) https://arxiv.org/abs/2507.07775 #Jets
July 14, 2025 at 5:24 PM
Reposted by Oz Amram
iopp-mlresearch.bsky.social
🚨Great new Dataset article in #MLST🚨
@kasieczka.bsky.social @mikraemer.bsky.social @ozamram.bsky.social & co-authors ‘prep 180M jets from pp collisions for easy AI training & use them to pre-train a foundation model’

#FoundationModels #ParticlePhysics #OpenData #LHC

Paper ➡️ bit.ly/4eE0QO1
July 9, 2025 at 2:33 PM
Reposted by Oz Amram
astrokatie.com
Just click on this: skyviewer.app/explorer #RubinTelescope
Explorer | Skyviewer
skyviewer.app
June 24, 2025 at 2:58 PM
Reposted by Oz Amram
vrubinobs.bsky.social
Introducing...your sneak peek at the cosmos captured by NSF–DOE Vera C. Rubin Observatory!

Can you guess these regions of sky?

This is just a small peek...join us at 11am US EDT for your full First Look at how Rubin will #CaptureTheCosmos! 🔭🧪

#RubinFirstLook
ls.st/rubin-first-look-livestream
A sprawling, textured field of galaxies scattered across the deep black of space. It is filled with the delicate smudges and glowing cores of galaxies of many shapes, sizes and colors, as well as the bright multi-colored points of stars. The image focuses on a collection of interacting galaxies connected by delicate streams of stars. At top center lies a large elliptical galaxy that is dense and smooth, like a polished stone glowing with golden light. Like delicate spider silk or stretched taffy, these stellar bridges link the large elliptical to the few larger galaxies beneath, evidence of past collisions. All throughout the image, thousands of galaxies gather in clusters or are spread throughout, like glittering gems strewn on a table. Some are sharp-edged and spiral, like coiled ribbons; others round and diffuse, like polished pebbles. Still others are just smudges of various colors against the black of space. The background is peppered with pinpoint stars in reds, yellows, and blues, crisp against the velvet black. A cosmic tapestry of glowing tan and pink gas clouds with dark dust lanes. In the upper right, the Trifid Nebula resembles a small flower in space. Its soft, pinkish gas petals are surrounded by blue gas, and streaked with dark, finger-like veins of dust that divide it into three parts. It radiates a gentle, misty glow, diffuse and soft like the warmth of breath on a cold hand. To the lower left, the much larger Lagoon Nebula stretches wide like a churning sea of magenta gas, with bright blue, knotted clumps sprinkled throughout where new stars are born. Both nebulae are embedded in a soft tan backdrop of gas that is brighter on the left than on the right, etched with dark tendrils of dust and sprinkled with the pinpricks of millions of stars. A sprawling, textured field of galaxies scattered across the deep black of space. It is filled with the delicate smudges and glowing cores of galaxies of many shapes, sizes and colors, as well as the bright multi-colored points of stars. To the lower left is a region filled with the hundreds of golden glittering gems of a distant galaxy cluster. In the foreground, below and right of center, two blue spiral galaxies look like eyes beneath the entangled mass of a triple galaxy merger in the upper right. A few bright blue points of foreground stars pierce the glittering tapestry. All throughout the image, thousands of galaxies gather in clusters or are spread throughout, like glittering gems strewn on a table. Some are sharp-edged and spiral, like coiled ribbons; others round and diffuse, like polished pebbles. Still others are just smudges of various colors against the black of space. The background is peppered with pinpoint stars in reds, yellows, and blues, crisp against the velvet black.
June 23, 2025 at 4:06 AM
ozamram.bsky.social
So now it looks g-2, W mass, and R(K) are dead as anomalies

Anyone have a favorite alive anomaly?

R(D)? X17? (bolstered by recent PADME results 👀)
something else??
June 12, 2025 at 1:34 PM
ozamram.bsky.social
Scientists for Palestine is holding a school on quantum physics Palestinian students in Jordan in July, but they need donations to make it happen! 🇵🇸

www.scientists4palestine.org/palestinian-...

www.gofundme.com/f/support-pa...
Palestinian Advanced Physics School 2025 - Scientists For Palestine
The Palestinian Advanced Physics School 2025 (PAPS) will be held in-person at the University of Jordan between 26th — 31st July 2025. Additional students will join remotely from Gaza. The school is ai...
www.scientists4palestine.org
June 11, 2025 at 6:30 PM
Reposted by Oz Amram
aishikghosh.bsky.social
Wondered what it would take for AI agents to design and test new theories for fundamental physics, just like a physicist? We show how, an example in neutrino model building! Paper with Jake, Max, Victoria, Jason leading crucial aspects, also
@danielwhiteson.bsky.social
.
arxiv.org/abs/2506.08080
June 11, 2025 at 4:10 PM
ozamram.bsky.social
New paper on arXiv today!
arxiv.org/abs/2506.06438
Wouldn't it be nice to fit in high dimensions using a data-driven background estimate? By using generative ML models you can!

We showcase this on an example di-Higgs measurement, performing a 5D fit, (can probably go higher with more work)
Data-Driven High-Dimensional Statistical Inference with Generative Models
Crucial to many measurements at the LHC is the use of correlated multi-dimensional information to distinguish rare processes from large backgrounds, which is complicated by the poor modeling of many o...
arxiv.org
June 10, 2025 at 2:28 PM
ozamram.bsky.social
Paper day! On a new usage of anomaly detection

Our idea is to look for resonances produced with interesting other event activity (X), which you identify with one of the anomaly detection methods we have been using for jets

arxiv.org/abs/2504.13249
Weakly supervised anomaly detection with event-level variables
We introduce a new topology for weakly supervised anomaly detection searches, di-object plus~X. In this topology, one looks for a resonance decaying to two standard model particles produced in associa...
arxiv.org
April 21, 2025 at 8:59 PM
ozamram.bsky.social
CMS is seeing an unexpected excess of top quarks in their data. But what is causing it?

Signs are pointing to 'toponium' an unstable bound state of two top quarks, which was previously thought impossible to form!

Read more in the newest ParticleBites!
www.particlebites.com?p=10001
A comparison of CMS's data and their predicted backgrounds. An excess of data is seen at low invariant masses. The excess is well described by a new particle (shown in as a red line)
April 15, 2025 at 1:02 PM
ozamram.bsky.social
What collider do early career particle physicists in the US want?

We surveyed 100+, check out our input to the European strategy to find out!

Short answer : Lots of variety of opinion, but highest enthusiasm for a @muoncollider.bsky.social

arxiv.org/abs/2503.22834
A box and whisker plot showing the ratings for excitement (on a 1 to 5 scale) FCC-ee (mean 3.2), Linear-ee (mean 3.2), FCC-hh at 85 TeV (mean 3.7), Muon collider at 3 TeV (mean 4.1) and Muon collider at 10 TeV (mean 4.6)
April 1, 2025 at 1:30 PM
ozamram.bsky.social
CMS has a new result out fresh today for Moriond!
"Observation of a pseudoscalar excess at the top quark pair production threshold"

Very much looks like the discovery of toponium, a short-lived top - anti-top bound state

arxiv.org/abs/2503.22382
A contour diagram showing the likelihood of the excess cross section, showing > 5 sigma away from the background only hypothesis
March 31, 2025 at 1:54 PM
Reposted by Oz Amram
cgrefe.bsky.social
There is currently a call for community input to the update of the European Strategy for Particle Physics. Here is one by early career researchers that highlights the importance of career perspectives and talent development when planning large projects over multiple decades: arxiv.org/abs/2503.19862
Early Career Researcher Input to the European Strategy for Particle Physics Update: White Paper
This document, written by early career researchers (ECRs) in particle physics, aims to represent the perspectives of the European ECR community and serves as input for the 2025--2026 update of the Eur...
arxiv.org
March 26, 2025 at 5:46 PM
ozamram.bsky.social
Standing up for science! On a cold wet Chicago day
March 7, 2025 at 8:46 PM
ozamram.bsky.social
It seems like the magnets needed for FCC-hh could be ready by ~2055 (or even earlier) ?!

I had thought the magnets were main reason hh couldn't start until ~2070
Slide showing a timeline for magnet development for FCC-hh
January 13, 2025 at 5:16 PM