515664 research outputs found
Sort by
EOS 2025 Workshop
No full textThis work presents an evaluation of JUMBO frame tests conducted at CERN to assess their impact on data transfer performance across different physics workflows. Preliminary internal tests were carried out to analyze potential benefits and challenges, followed by collaborative testing involving the ATLAS, CMS, and LHCb experiments. The goal was to measure the advantages of JUMBO frames in terms of efficiency and throughput while identifying and resolving any issues arising from their deployment. The study provides insights into the feasibility of JUMBO frames for large-scale scientific data transfers, aiming to optimize network performance for high-energy physics experiments
The energy reconstruction algorithm for high injection background
No full textThe SuperKEKB e+e− collider is operated with the continuous injection that tops up the beams during colliding beam operation for physics data taking to maximize integrated luminosity. When the beam bunch is injected to the collider ring, there is an unavoidable disturbance by the injected bunch. At the Belle II electromagnetic calorimeter, countermeasure for the injection background using the detector’s waveform readout data is being considered. We report its concept and recent development status
Search for new physics in the monophoton final state using full Run2 data
No full textA search for new physics in the final state of a single photon and high missing transverse energy is performed using proton-proton collision data at a center-of-mass energy of . The analysis is performed on a data sample corresponding to an integrated luminosity of , collected using the CMS detector in 2017 and 2018. A statistical combination is performed with an earlier search based on , collected in 2016. No deviations from the predictions of the standard model are observed. The results are interpreted in the context of dark matter production and models containing extra spatial dimensions, and limits on new physics parameters are calculated at the confidence level. For the two simplified dark matter production models considered, the observed (expected) lower limits on the mediator masses are both 1085 (1300) for 1 dark matter mass. For an effective electroweak--dark matter contact interaction, the observed (expected) lower limit on the suppression parameter is 937 (1000). For the ADD model, which provides the framework for extra dimensions aspects, values of the effective Planck scale up to 3.17--3.20 are excluded between 3 and 6 extra spatial dimensions
The SND@LHC neutron shielding
No full textWe report the design and construction of a neutron shielding system for the SND@LHC detector, utilizing a combination of plexiglass and borated polyethylene. FLUKA simulations were employed to optimize the shielding configuration and assess its efficiency. Results indicate a significant reduction in neutron flux, ensuring the long-term stability of the emulsion films used in the target of the SND@LHC detector.The design and construction of a neutron shielding for the SND@LHC detector, which utilizes a combination of plexiglass and borated polyethylene, is presented. FLUKA simulations were employed to optimize the shielding configuration and assess its efficiency. Results indicate a significant reduction in neutron flux, ensuring the long-term stability of the emulsion films used in the target of the SND@LHC detector
Highlights on Higgs physics with ATLAS
No full textHiggs measurements from ATLAS, including highlights on Higgs couplings, di-Higgs searches, and recent HL-LHC results
Electroweak and QCD Measurements in ATLAS
No full textThis talk will discuss recent results from the ATLAS experiment concerning measurements in the electroweak and QCD sector. The highlighted topics include precision measurements of Drell-Yan and multiboson processes (including vector-boson-scattering), differential measurements of vector boson plus jets and multijets, novel study of jet substructures, probe of soft QCD phenomena, and precision heavy-flavor measurements. These results help advance the understanding of important questions relating to electroweak symmetry breaking, electroweak Gauge structure, proton structure, flavor physics, perturbative QCD as well as fragmentation and hadronization. In addition, the new-generation measurements offer more sensitive constraints on new physics phenomena in the framework of Effective Field Theories
Student Sessions 2025
No full textAngel Macaulay is a final year Mechanical Engineering of the University of Benin, Edo State, Nigeria. She is from Ughelli south local government area Delta state Nigeria. The LHCb VR project is aimed at creating a VR representation of the LHCb cavern using a powerful platform called NVIDIA Omniverse primarily to aid outreaches and visits at LHCb site. It is a fun way of learning about LHCb because it enables good visualization and user engagement while learning. It also promotes collaboration between various departments at CERN as meetings were held with PLM, CMS, Phoenix, LHCb cad design team and NVIDIA concerning this project
Student Sessions 2025
No full textThrough the concordance model of cosmology, it is possible to predict the primordial abundances of light elements within the framework of Big Bang Nucleosynthesis (BBN). These predictions agree remarkably well with observations of the primordial abundances of helium-4 and deuterium. Specifically, the deuterium abundance is strongly sensitive to nuclear reaction rates, such as or . By understanding in what energy ranges more precise measurements of these rates are needed, we hope to improve our knowledge of these rates to allow stronger cosmological inferences to be made from deuterium observations. These in turn allow us to make important improvements in estimating cosmological parameters such as , the effective number of neutrino species