Where could the LHC experiments take this kind of technology?
The high granularity tracker of CMS is the largest silicon tracker ever built with 1856 pixel and 15148 strip detector modules that provide accurate track reconstruction. To achieve high precision in measurements of the momenta of charged particles, corrections for the position, rotation and curvature of these modules must be found; such a procedure is known as tracker alignment. Magnet...
In the CMS Phase-II upgrade for High-Luminosity LHC (HL-LHC), designing an efficient Level-1 trigger system is a challenging task due to multiple proton-proton collisions (pileup). The Missing Transverse Energy (MET) can be seriously affected by the high-pileup environment without mitigations. We introduce the improved Level-1 MET algorithm assisted by the jet energy resolution (JER),...
The ATLAS Collaboration at CERN has developed a wide array of resources to support informal education for all ages. From colouring books and activity sheets for children, to fact sheets and cheat sheets for more advanced learners, ATLAS provides a collection of printable resources that can be used to learn more about particle physics and the ATLAS detector. In addition, the latest 3D printed...
Since 2010, ATLAS Virtual Visits have revolutionised HEP outreach by connecting its collaboration members with audiences worldwide. The Virtual Visit model brings inspiring scientific outreach events to visitors who would otherwise not have such an opportunity. Over the years, by offering the visits in a variety of languages and using a variety of online platforms, we have expanded their...
Modern experimental physics research, particularly in particle physics, requires extensive data analysis efforts to identify significant signals indicative of new physics. We present BumpNet, a novel Neural Network (NN) architecture designed to conduct model-independent searches for mass bumps arising from new physics phenomena. This model maps invariant mass histograms into statistical...
The GE1/1 system, based on Gas Electron Multiplier (GEM) technology, has been integrated into the forward region of the Compact Muon Solenoid (CMS) experiment as part of the Phase-2 upgrade. This GEM-based upgrade aims to bolster muon detection in the high-radiation environment expected at the High-Luminosity Large Hadron Collider (HL-LHC), which will begin operation around 2030 and is...
The Cabibbo-Kobayashi-Maskawa (CKM) matrix governs flavor-changing quark interactions, with its element $\vert V_{ts} \vert$ describing the coupling between the top and strange quarks. Although the decay $t \to sW$ has not yet been observed directly, a measurement of $\vert V_{ts} \vert$ can be pursued by identifying strange jets produced in top quark decays. However, the relative rarity of $t...
This study explores the use of deep learning techniques to enhance local muon reconstruction in the ME0 detector of the CMS experiment. The ME0 detector, based on Gas Electron Multiplier (GEM) technology, will be introduced during the Phase-2 upgrade to extend muon detection into the forward pseudorapidity range 2.0 < |η| < 2.8. Because of high pileup, accurate muon reconstruction is...
The High-Luminosity LHC will start operations for physics around 2030, allowing to collect ten times more data than what will have been achieved by the LHC. This expansion of the dataset will be achieved by increasing the number of collisions per bunch crossing, leading, however, to higher radiation doses and busier events. To cope with those harsher data taking conditions and to be compatible...
The differential branching fractions results for the flavor changing neutral current Bs to phi(1020) mu mu are shown as a function of dimuon mass squared using the integrated luminosity of 137.5 \fb of data collected by the CMS detector at center of mass energy of 13 TeV
In 2024 we initiated a pilot podcast at CERN to explore the platform as a means not only to inform and educate, but to engage the public by bringing them into our world. With more than half a billion podcast listeners in the world today, there is a potential not only to reach new, diverse audiences, but also to gain their trust by welcoming them into our conversation and sharing the human...
The ME0 detector is a Gas Electron Multiplier (GEM) detector which will be installed as part of the phase-2 upgrade of the Compact Muon Solenoid (CMS) experiment in the Large Hadron Collider (LHC). ME0 is located in the endcap area of the CMS muon system. It is the only muon detector that covers |eta| > 2.4. Due to the high background environment, keeping the trigger rate low while maintaining...
Beyond the Standard Model physics may have new sources of CP violation. In particular, CP violation in the Yukawa interactions is welcome for electroweak baryogenesis. The most general CP violating $H\psi\psi$ Yukawa interaction can be written as $ -\frac{m_\psi}{v}\bar\psi ( a + ib\gamma_5)\psi$, where $a,b$ are real valued parameters ($a^{SM} = 1, b^{SM}=0$). If both $a\neq 0$ and $b\neq 0$,...
In this poster we present the first CMS differential cross section measurements of top quark pair production in association with a W boson (ttW). The measurements are using 138/fb of proton-proton collision data collected between 2016 and 2018 at √s = 13 TeV. We present (normalized) differential cross-sections, which can provide relevant feedback to the modeling community and are important for...
The ATLAS Collaboration has recently, for the first time, released a large volume of data for use in research publications, with its use being now extended via a new education-focused release. The 2015 and 2016 proton collision datasets, along with a large quantity of matching simulated data, in a light format, PHYSLITE, for research purposes, and in a simplified version for educational...
The study of multi-Higgs production is essential for probing the Higgs boson’s self-interactions and exploring potential physics beyond the Standard Model. In this work, we investigate Tri-Higgs events decaying into six b-quarks and propose a novel machine learning approach to enhance experimental sensitivity. Our method utilizes the Symmetry Preserving Attention Network (SPANet). This neural...
Photons and electrons behave similarly in the electromagnetic calorimeter at CMS. However, a key distinguishing feature lies in the presence of signals detected in the tracker. To enhance the discrimination between these two particles and reduce contamination in analyses involving photons in the final state, two complementary electron veto methods are investigated. One method focuses on...
In hadron colliders, event reconstruction of processes involving neutrinos is challenging because the initial partons cannot be fully constrained, detector responses are not ideal, and multiple interactions are overlaid in the same event.
Many algorithms have been proposed to reconstruct events with missing momentum information using additional constraints based on prior knowledge of...
We present a comprehensive study of near-threshold structures in the ( J/\psi J/\psi ) mass spectrum using the fully reconstructed ( J/\psi J/\psi \rightarrow 4\mu ) final state, based on proton-proton collision data at ( \sqrt{s} = 13 ) and 13.6 TeV collected by the CMS experiment. With approximately four times more ( J/\psi ) pair candidates compared to the previous Run 2 dataset,...
The real-time identification and selection of b-jets play a crucial role in the CMS experiment, particularly in searches involving heavy-flavor jets. The High-Level Trigger (HLT) is designed to efficiently select events of interest while maintaining a manageable output rate of a few kilohertz. This poster presents the commissioning and performance evaluation of b-jet triggers in the CMS HLT...
The Physics Project Days (PPD) are an outreach project dedicated to promote gender equality in physics. During this four-day workshop, female high school students are invited to experience modern research in an unbiased environment to eliminate possible concerns about a career in science. In the project, the students investigate and gain insights into one topic from a broad spectrum of fields,...
Particle physics outreach plays a crucial role in inspiring future scientists and fostering public engagement with fundamental research. Our initiative focuses on making collider physics accessible in Pakistan, breaking systemic barriers, and promoting inclusivity in science. Since 2021, students from the University of Karachi have actively led various educational programs, public events, and...
We study the quantum properties of Higgs-boson decays into vector bosons and their sensitivity to new physics, parametrized using an effective extension of the Lagrangian. We simulate four-fermion final states, focusing on the $H\to ZZ^{(*)}$ decay leading to four charged leptons in the final states, and compute quantum observables within the standard model up to next-to-leading order (NLO)...
In modern particle physics, a key objective is to examine the Standard Model (SM) using data collected from collider experiments. Vector boson scattering (VBS), the interaction of vector bosons emitted by quarks from colliding protons, is a crucial study at the LHC. It is highly sensitive to physics beyond the Standard Model (BSM) and provides valuable insights into electroweak symmetry...
In 2025, the landscape of science communication is shifting dramatically. Once-dominant social media platforms are in decline, fractured by distrust, misinformation, and algorithmic echo chambers. For large-scale scientific collaborations, this creates both challenges and opportunities to take new approaches. Traditional social media outreach is losing effectiveness, requiring new strategies...
A search for a new heavy particle produced in association with top quarks and exclusively decaying into a top quark pair is presented, based on proton-proton collision data taken with the CMS experiment from 2016 to 2018 at 13 TeV and 2022 at 13.6 TeV.
The two top quarks from the new particle are expected to be highly Lorentz-boosted. The particle mass is reconstructed from a pair of...
In this poster, we present recent results from studies of flavor-changing neutral current (FCNC) processes involving a top quark, a Z boson, and an up or charm quark in the final state. The analysis is based on proton-proton collision data collected by the CMS experiment during Run II of the Large Hadron Collider at a center-of-mass energy of 13 TeV. The search focuses on final states with...
With the start of Run3, the LHC increased pp collision energies to $\sqrt(s) = 13.6$ TeV, and the CMS detector collected 63 fb$^{-1}$ of data during 2022 and 2023. Using this data, a search for non-resonant Higgs boson pair production in the bb\tau\tau final state is presented. This final state provides a good compromise between a sizeable branching fraction (7.3 \%) and the purity of the...
The observation of four-top-quark production marks a significant milestone in advancing our understanding of the top-quark sector. In this poster, we present a BSM interpretation of four-top-quark production, exploring three different scenarios: (a) an interpretation within the SMEFT framework, (b) a search for top-philic heavy resonances, and (c) the extraction of the top-quark Yukawa...
The shape of the Higgs boson potential can be accessed by measuring the trilinear self coupling, which is the only direct way to probe the mechanism of electroweak symmetry breaking and the stability of the Higgs potential. A search for non-resonant Higgs boson pair production via gluon-gluon and vector boson fusion processes in final states with two bottom quarks and two photons is presented,...
ALADDIN (An Lhc Apparatus for Direct Dipole moments INvestigation) is a new proposed compact fixed-target experiment at the LHC, which will enable a unique program of measurements of charm baryon electromagnetic dipole moments. The experiment relies on an innovative storage-ring layout capable of deflecting protons from the beam halo towards a solid target paired to a bent crystal where...
The ATLAS Collaboration comprises nearly 6000 members, from over 100 different countries across the globe. The broad spectrum of cultural, social, economic, linguistic and educational backgrounds of these individuals is not only enriching to the community, but is critical to the success of the experiment's scientific research. To support this rich diversity, ATLAS is in the process of...
