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Student Sessions 2025
No full textHello! My name is Ash, I am a physics bachelors student from Canada entering my final year of studies.
In this talk, I present an analysis of central diffractive events in proton–proton collisions using the CMS Precision Proton Spectrometer (PPS). By tagging protons and reconstructing vertex positions via timing detectors, we explore a class of photon-mediated interactions in a non-perturbative QCD regime. We study kinematic distributions in data and simulation, applying event selection, timing correlations, event mixing, and sideband subtraction to estimate and separate background. This is among the first physics analyses using PPS to study central diffraction at LHC energies, providing new insights into a poorly modeled process
Student Sessions 2025
No full textHola! My name is Victor Clarizio, 29 years old and currently I'm finishing my Masters Degree in cosmic rays and high energy physics at the *Universidad Central de Venezuela* in Caracas, Venezuela. Also, I've been a lecturer at the very same university for about one year now. I like to go hiking, love to take pictures and sketch/paint, play football whenever I'm able to, and many other things! I feel honored to be here and to be part of CERN, and I will always treasure this enriching experience.
**My project at CERN as Summer Student:**
As part of the upcoming gaseous detector technologies, one that stands out from the rest are the Gas Electron Multiplier (GEM) detectors due to its versatility with most of gas fillings (including noble gases), proportional gains above 105, micrometric space resolution, typical energy resolution 18% FWHM at 5.9keV, low cost and robust technology. This presentation contains my work experience regarding the activities as a Non-Member State Summer Student from June, 16th to August, 8th 2025 working in the Gas Detector Development Lab (GDD) at CERN. Over the course of these weeks, I had a hands-on-work experience working on the assembly of MPGD prototypes and set up of a cosmic stand using a triple-GEM detector, alongside my direct supervisor Anna Stamerra and the rest of the team. At the end of the program, I gained invaluable researching experience and skills on experimental physics, instrumentation and data analysis applied to gaseous detectors and MPGD technologies
Deuteron identification via time of flight with LHCb
No full textIt is shown that the timing capabilities of the LHCb detector operated during the LHC Run 2 can be used to identify light ion particles with momenta of a few GeV/c. This is achieved by estimating the particle time of flight through a newly developed technique. A dedicated reconstruction procedure and a neural-network-based estimator of the particle speed have been developed to enable deuteron identification by suppressing the abundant background from lighter particles. The performance of the identification procedure is demonstrated in a sample of proton-helium collisions at = 110 GeV, where the production of deuteron and triton particles is observed. This novel approach opens the way to study deuteron and antideuteron production for different collision systems at different energy scales, exploiting the rich dataset collected by the LHCb experiment.It is shown that the timing capabilities of the LHCb detector operated during the LHC Run 2 can be used to identify light ion particles with momenta of a few GeV/. This is achieved by estimating the particle time of flight through a newly developed technique. A dedicated reconstruction procedure and a neural-network-based estimator of the particle speed have been developed to enable deuteron identification by suppressing the abundant background from lighter particles. The performance of the identification procedure is demonstrated in a sample of proton-helium collisions at GeV, where the production of deuteron and triton particles is observed. This novel approach opens the way to study deuteron and antideuteron production for different collision systems at different energy scales, exploiting the rich dataset collected by the LHCb experiment
On Dequantization of Supervised Quantum Machine Learning via Random Fourier Features
No full textIn the quest for quantum advantage, a central question is under what conditions can classical algorithms achieve a performance comparable to quantum algorithms--a concept known as dequantization. Random Fourier features (RFFs) have demonstrated potential for dequantizing certain quantum neural networks (QNNs) applied to regression tasks, but their applicability to other learning problems and architectures remained unexplored. In this work, we derive bounds on the true risk gap between classical RFF models and quantum models for regression and classification tasks with both QNN and quantum kernel architectures. Furthermore, we provide sufficient conditions under which this gap is small and thus the quantum system can be dequantized via the RFF method. We support our findings with numerical experiments that illustrate the practical dequantization of existing quantum kernel-based methods. Our findings not only broaden the applicability of RFF-dequantization but also enhance the understanding of potential quantum advantages in practical machine-learning tasks
Comprehensive studies on calibration parameters of the LHCb Upstream Tracker
No full textThe Upstream Tracker is a novel silicon microstrip detector installed during LHCb Upgrade 1. To maintain the necessary efficiency, its performance requires constant monitoring and evaluation of the calibration parameters of over half a million sensors. Here, recent results regarding the stability and uniformity of those parameters are presented in order to establish whether the UT forms a stable detecting system supporting reliable physics results.The input data comprise calibration scans taken regularly in the second half of 2024. They contain information on the baseline offset and different noise components. We performed extensive studies regarding the time evolution of those parameters and their spatial distributions.Our results confirm that the Upstream Tracker demonstrates stable overall performance in all analysed calibration parameters. However, several local deviations have been identified, and an ongoing effort is being made to minimise their influence on the detector's performance
A Long-Baseline Atom Interferometer at CERN LHC Point 4: Implementation Study
No full textBuilding on the previous feasibility study, this report supported by the Physics Beyond Colliders (PBC) Study Group describes the technical implementation of modifications to the PX46 shaft at LHC Point 4 during LS3 (June 2026 – June 2030) that would enable it to accommodate the installation and operation of a vertical long-baseline Atom Interferometer during Run 4 without affecting LHC operations. We specify in detail the necessary civil‐engineering work, installation of bespoke radiation shielding, deployment of access‐control systems and safety alarms, and design of a mobile elevator platform. Our comprehensive technical assessment identifies no fundamental obstacles or showstoppers to implementation. Refined cost estimates and a critical‐path schedule confirm that, from formal approval, all interventions can be completed within a 1.5-year window. These preparations would ensure seamless, concurrent operation of the Atom Interferometer experiment and the HL-LHC, with all technical challenges successfully addressed through established engineering solutionsBuilding on the feasibility study in CERN-PBC Report-2018-002 (Arduini et al. 2018), this report supported by the Physics Beyond Colliders (PBC) Study Group describes the technical implementation of modifications to the PX46 shaft at LHC Point 4 during LS3 (June 2026 - June 2030) that would enable it to accommodate the installation and operation of a vertical long-baseline Atom Interferometer during Run 4 without affecting LHC operations. We specify in detail the necessary civil-engineering work, installation of bespoke radiation shielding, deployment of access-control systems and safety alarms, and design of a mobile elevator platform. Our comprehensive technical assessment identifies no fundamental obstacles or showstoppers to implementation. Refined cost estimates and a critical-path schedule confirm that, from formal approval, all interventions can be completed within a 1.5-year window. These preparations would ensure seamless, concurrent operation of the Atom Interferometer experiment and the HL-LHC, with all technical challenges successfully addressed through established engineering solutions
Proton Beam Dynamics for Concurrent Operation of the LHeC and HL-LHC
No full textThe Large Hadron electron Collider (LHeC) project is studying a new LHC interaction region fordeep inelastic scattering collisions between electrons and hadrons in the TeV energy scale. Anintense 50 GeV lepton beam is brought into collision with one 7 TeV hadron beam from CERN’sLarge Hadron Collider in parallel to the hadron-hadron operation. A flexible proton beam opticshas been found for matched e-p beam conditions, fully compatible with the HL-LHC upgradeproject for highest e-p luminosity
VBS measurements including Majorana neutrino searches at ATLAS and CMS
No full textThese proceedings report recent measurements of vector boson scattering processes at the LHC. These results provide stringent tests of the Higgs mechanism and offer a new avenue for precision tests of the Standard Model as well as Monte-Carlo modelling. In addition, the search for Majorana neutrinos via similar final states is discussed
