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SBN@CERN: A short-baseline neutrino beam at CERN for high-precision cross-section measurements
No full textA new generation of neutrino cross-section experiments at the GeV scale is crucial in the precision era of oscillation physics and lepton flavor studies. In this document, we present a novel neutrino beam design that leverages the experience and R&D achievements of the NP06/ENUBET and NuTag Collaborations and explore its potential implementation at CERN. This beam enables flux monitoring at the percent level and provides a neutrino energy measurement independent of final state particle reconstruction at the neutrino detector. As a result, it eliminates the two primary sources of systematic uncertainty in cross-section measurements: flux normalization and energy bias caused by nuclear effects. We provide a detailed description of the beam technology and instrumentation, along with an overview of its physics potential, with particular emphasis on cross-sections relevant to DUNE and Hyper-Kamiokande
Super Quantum!
No full textSuper Quantum!
Exploration de la physique quantique à travers les BD et les super-héros
Enregistrement de l'événement: Super Quantum! - CERN Document Server
Inscrivez Super Quantum! dans votre agenda et venez fêter la Journée mondiale des sciences et technologies quantiques au CERN. Cet événement vous invite à explorer le monde fascinant de la science quantique, dont le potentiel pourrait transformer en profondeur l'avenir de la science et de nos sociétés.
Super Quantum! rendra la science quantique accessible et ludique en s’appuyant sur ses représentations dans la pop culture, comme les super-héros et les bandes dessinées, pour le plus grand plaisir de tous.
En ouverture, Géraldine Haack, physicienne à l’Université de Genève, présentera une introduction de la mécanique quantique à travers des illustrations de Laurent Schafer, auteur de la bande dessinée 'Quantix'.
Sofia Vallecorsa, coordinatrice de la Quantum Technology Initiative (QTI) du CERN, mettra par la suite en avant des technologies quantiques actuellement en développement. Elle partagera aussi plus d’information sur les opportunités de formation dans ce domaine.
Pour clore l'événement, Loïc Mougel, auteur du livre 'La physique quantique par Antman, les Pokémon... & les super-héros !', explorera les interprétations de la mécanique quantique dans la culture populaire, notamment dans les films Marvel. Il mettra en lumière la distinction entre science et fiction avec l'aide de nos expertes Géraldine Haack et Sofia Vallecorsa. Le public participera également à ce débat ludique et interactif !
Informations pratiques
Horaires : ouverture des portes à 19:30, début de l'événement à 20:00. Durée: 1h30
Lieu : Portail de la science, Auditorium Sergio Marchionne
Langue : français avec interprètation simultanée en anglais
Inscription : événement gratuit, ouverture des inscriptions le 9 mars 2025.
Petite restauration
Avant le début de l’événement, le Big Bang Café sera ouvert et vous accueillera jusqu'à 20h00. Profitez d’une petite restauration avec sandwichs et boissons pour bien démarrer la soirée.
Les super-pouvoirs de l’Univers - Ateliers BD et sciences au CERN
L'après-midi du 9 avril, le dessinateur de bandes-dessinées Laurent Schafer, auteur de la bande dessinée à succès Quantix, conduira deux ateliers destinés aux enfants de 10 à 14 ans. Retrouvez tous les détails et inscrivez-vous en cliquant ici !
Super Quantum!
Recording of the event: Super Quantum! - CERN Document Server
Exploring quantum physics through comic and superheroes
Save the date for Super Quantum! and join us at CERN to celebrate World Quantum Day. This event will explore the fascinating world of quantum science, which holds the potential to profoundly shape the future of science and society.
Super Quantum! will present quantum physics in a fun and accessible way, drawing on its representation in pop culture, such as superheroes and comic books, to captivate audiences of all ages.
Kicking off the event, Géraldine Haack, Assistant Professor in Quantum Physics at the University of Geneva, will offer an introduction to quantum mechanics, accompanied by illustrations from comic book artist Laurent Schafer and his album 'Quantix'.
Sofia Vallecorsa, coordinator of CERN’s Quantum Technology Initiative (QTI), will then highlight current developments in quantum technologies and share insights on education opportunities in this field.
To conclude, Loïc Mougel, author of 'La physique quantique par Antman, les Pokémon... & les super-héros !', will explore how quantum mechanics is interpreted in pop culture, particularly in Marvel movies. He will address the differences between science and fiction, with input from our experts, Géraldine Haack and Sofia Vallecorsa. The audience will also have the opportunity to engage in the discussion.
Practical information
Time: Doors opening at 19.30, event starts at 20.00. Duration: 1h30.
Location: CERN Science Gateway, Auditorium Sergio Marchionne
Language: French with simultaneous interpretation into English
Registration: Free of charge, mandatory registration opening on 9 March 2025.
Refreshments
Prior to the event, the Big Bang café will stay open until 20.00. Enjoy a light meal with sandwiches and drinks for a great start to the evening.
Les super-pouvoirs de l’Univers - Ateliers BD et sciences au CERN
On the afternoon of 9 April, comic book artist Laurent Schafer, author of the popular science comic book Quantix, will conduct two workshops (in French) for 10-14 year-olds. Find all the details and sign up now by clicking here!
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ALICE ITS3 - A bent wafer-scale monolithic pixel detector
No full textALICE is upgrading its inner three silicon tracker layers with a bent wafer-scale monolithic pixel detector (ITS3).Each layer comprises two sensors, 27 cm long, 50 µm thick and bent to concentric half-layers around the beam pipe (radii: 19, 25, 32 mm) supported by carbon foam stiffeners. The sensors with 40 mW/cm² consumption and a material budget of 0.07% X0 per layer are air-cooled.Fabrication of 27 cm long sensors, requires stitching at foundry level connecting identical reticle-sized sensor elements, bypassing the need for flexible printed circuits. Pixel test structures on a 300 mm, 65 nm TPSCo technology were validated with a resolution of 5 µm, an efficiency of > 99%, a fake hit rate of < 10-2/pixel/s and a radiation load of 4*1014 1 MeV neq cm-2. These findings were further corroborated with 26 cm long Monolithic Stitched Sensor prototypes, confirming the stitching and integration process in laboratory and beam tests.Prototype silicon sensors thinned to ≤ 50 µm were successfully bent to the ITS3's required radii while retaining full functionality. Mechanical engineering models with 50 µm thick dummy sensors demonstrated a mechanical stability of ± 0.5 μm under an 8 m/s airflow, consistent with the sensor’s power consumption and the interconnection scheme.The design of the final full-function sensor prototype (MOSAIX) with a pixel size of 22.8 x 20.8 µm2 is underway. The seminar will report on the R&D phase, the final sensor design and detector integration.
Coffee will be served at 10:30</p
Combined measurements and interpretations of Higgs boson production and decay at sqrt(s)=13 TeV
No full textCombined measurements of Higgs boson production and decay rates are presented. The analyses included use proton-proton collision data recorded by the CMS experiment at from 2016 to 2018, corresponding to an integrated luminosity of . The statistical combination is based on analyses which measure the following decay channels: , , , , , and . Each decay channel targets multiple Higgs boson production modes. Searches for invisible Higgs boson decays are also considered, as well as an analysis which measures offshell Higgs boson production in the decay channel. The best-fit inclusive signal yield is measured to be times the standard model expectation, for a Higgs boson mass of . Additional results are provided for various assumptions on Higgs boson production and decay. This includes measurements of production mode cross sections and branching fractions, measurements of kinematic regions defined by the simplified template cross section framework, as well as interpretations in the coupling modifier and standard model effective field theory frameworks. This note represents the most comprehensive study of Higgs boson production and decay performed by the CMS experiment to-date
ECON-T and ECON-D: Endcap Concentrator ASICs for the CMS HGCAL
No full textWith over 6 million channels, the High Granularity Calorimeter (HGCAL) for the CMS HL-LHC Upgrade presents a unique data challenge. The ECON ASICs provide critical on-detector data reduction for the 40 MHz trigger path (ECON-T) and 750 kHz data acquisition path (ECON-D) of the HGCAL. The ASICs, fabricated in 65 nm CMOS, are rad-tolerant (600 Mrad) with low power consumption (<2.5 mW/channel). This presentation is the first comprehensive description of the ECON designs, first functionality and radiation tests for the ECON-T ASIC, and first results from the full production of 75k ECON-D and ECON-T ASICs
CMS Inner Tracker Upgrade for the HL-LHC Design, Development, and Production Status
No full textThe High Luminosity Large Hadron Collider operation will push the CMS experiment to its limits, with an instantaneous peak luminosity of and an integrated luminosity of per year. This environment will expose the CMS Inner Tracker (IT) pixel detector at the center of CMS to unprecedented levels of radiation, with a 1 MeV neutron equivalent fluence of and a total ionizing dose of after of integrated luminosity. To endure these conditions and handle hit rates of while managing a pileup of 140 to 200 collisions per bunch crossing, the new IT system will employ a highly granular design with thin silicon sensors, small pixels (), and fast, radiation-hard electronics based on a CMOS ASIC developed by the RD53 collaboration. A novel serial powering scheme and high-bandwidth readout system will support the upgraded modules, while lightweight carbon-fiber mechanics with two-phase CO cooling will ensure structural integrity. The design will extend the tracking coverage up to . This contribution presents an overview of the CMS IT upgrade project, focusing on the ongoing activities and status of the module production of all the IT subsystems
Development and Optimization of a Carbon-Nanotube Based Electron Gun
No full textField emission (FE)‐based cathodes have become a promising alternative to thermionic sources, which suffer from high transverse energy spread and high power consumption. Here, a carbon‐nanotube (CNT)‐based electron gun was studied as a potential replacement for the thermionic gun currently used in the electron cooler of the Extra Low ENergy Antiproton (ELENA) decelerator at CERN. Earlier investigations on a cold cathode test bench (CCTB1) found that honeycomb‐patterned, vertically aligned CNT (VACNT) arrays (1x1cm2 surface area) could function as a feasible FE source, leading to the proposal of a dual‐gridded electron gun prototype. This study focuses on three core objectives: (1) fabricate and characterize larger (up to 4x4cm2) patterned VACNT samples for use in the electron gun; (2) modify CCTB1 to include a beam transport and diagnostic system to test the prototype’s proof of concept; (3) compare experimental findings with previously conducted simulations to anticipate beam behavior. Fowler-Nordheim analysis confirmed field‐emission‐based operation in all samples, with larger samples showing better FE performance. However, the current density was significantly lower than expected. An electron beam was successfully generated from a large sample implemented the improved prototype, but it exhibited greater divergence and a larger radius than simulations predicted. Overall, the results confirm that VACNT‐based cold cathodes can serve as viable source in a gridded electron gun configuration, warranting future research and development efforts
Femtoscopic study of the proton-proton and proton-deuteron systems in heavy-ion collisions at the LHC
No full textThis work reports femtoscopy correlations of pp (pp) and pd (pd) pairs measured in PbPb collisions at center-of-mass energy TeV by the ALICE Collaboration. A fit to the measured proton-proton correlation functions allows one to extract the dependence of the nucleon femtoscopic radius of the particle-emitting source as a function of the pair transverse mass () and of the average charge particle multiplicity for three centrality intervals (010%, 1030%, 3050%). In both cases, the expected power-law and liner scalings are observed, respectively. The measured pd correlations can be described by both two- and three-body calculations, indicating that the femtoscopy observable is not sensitive to the short-distance features of the dynamics of the p(pn) system, due to the large inter-particle distances in PbPb collisions at the LHC. Indeed, in this study, the minimum measured femtoscopic source sizes for protons and deuterons start at and fm, respectively, for the 3050% centrality of the collisions. Moreover, the -scaling obtained for the pp and pd systems is compatible within of the uncertainties. These findings provide new input for fundamental studies on the production of light (anti)nuclei under extreme conditions.This work reports femtoscopic correlations of pp () and pd () pairs measured in PbPb collisions at center-of-mass energy = 5.02 TeV by the ALICE Collaboration. A fit to the measured proton-proton correlation functions allows one to extract the dependence of the nucleon femtoscopic radius of the particle-emitting source on the pair transverse mass () and on the average charge particle multiplicity for three centrality intervals (010, 1030, 3050). In both cases, the expected power-law and linear scalings are observed, respectively. The measured pd correlations can be described by both two- and three-body calculations, indicating that the femtoscopy observable is not sensitive to the short-distance features of the dynamics of the p(pn) system, due to the large inter-particle distances in PbPb collisions at the LHC. Indeed, in this study, the minimum measured femtoscopic source sizes for protons and deuterons have a minimum value at and fm, respectively, for the 3050 centrality collisions. Moreover, the -scaling obtained for the pp and pd systems is compatible within 1 of the uncertainties. These findings provide new input for fundamental studies on the production of light (anti)nuclei under extreme conditions.This work reports femtoscopic correlations of p-−p(p‾-−p‾) and p−−d(p‾-−d‾) pairs measured in Pb–Pb collisions at center-of-mass energy per nucleon sNN = 5.02 TeV in the ALICE Collaboration. A fit to the measured proton-proton correlation functions allows one to extract the dependence of the nucleon femtoscopic radius of the particle-emitting source on the pair transverse mass (mT) and on the average charge particle multiplicity 〈dNch/dη〉1/3 for three centrality intervals (0–10%,10−−30%,30−−50%). In both cases, the expected power-law and linear scalings are observed, respectively. The measured p–d correlations can be described by both two- and three-body calculations, indicating that the femtoscopy observable is not sensitive to the short-distance features of the dynamics of the p-(p-n) system, due to the large inter-particle distances in Pb–Pb collisions at the LHC. Indeed, in this study, the minimum measured femtoscopic source sizes for protons and deuterons have a minimum value at 2.73−0.05+0.05 and 3.10−0.86+1.04 fm, respectively, for the 30–50% centrality collisions. Moreover, the mT-scaling obtained for the p–p and p–d systems is compatible within 1σ of the uncertainties. These findings provide new input for fundamental studies on the production of light (anti)nuclei under extreme conditions