- Seminars-iihe - listserv.vub.be

IIHE Seminar Friday 25 Oct: High-precision measurement of the W boson mass at CMS (Dr. Jan Eysermans)
by Gerrit Van Onsem 31 Jan '25

31 Jan '25

Dear all, This is a reminder of the IIHE seminar tomorrow Friday 25 October: * "High-precision measurement of the W boson mass at the CMS experiment" *by Dr. Jan Eysermans (MIT) The agenda can be found here: https://indico.iihe.ac.be/event/2054/ The seminar will take place at 14:30 in the Sacton seminar room (G.1.03). Please find the abstract and short bio below. Best regards, Gerrit *Abstract:* The W boson mass is measured using proton-proton collision data with an integrated luminosity of 16.8 fb⁻¹, collected by the CMS experiment in 2016. The mass is extracted through a fit to a highly granular two-dimensional distribution of transverse momentum (pT) and pseudorapidity (η) in a sample of W→μν decays, categorized by charge. This novel approach, which incorporates significant in-situ constraints on theoretical inputs and their associated uncertainties, along with precise determinations of experimental effects, yields a highly accurate W boson mass measurement of 80,360.2 ± 9.9 MeV, consistent with the Standard Model prediction. *Short Bio:* Jan Eysermans graduated in Physics from Ghent University in Belgium and completed his PhD at Benemérita Universidad Autónoma de Puebla in Mexico, where he worked on searching for new signatures beyond the Standard Model in the Higgs sector, especially focusing on charged Higgs bosons. He also served as the deputy technical coordinator for the CMS Resistive Plate Chambers subdetector, studied irradiation effects on RPC detectors, and contributed to Phase-2 upgrades. After working at SCK CEN as a project manager for nuclear fuel tests, Jan joined MIT as a postdoc at the CMS experiment, working on measuring the W boson mass.

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IIHE Seminar 25 October: W boson mass measurement from CMS (Dr. Jan Eysermans)
by Gerrit Van Onsem 07 Oct '24

07 Oct '24

Dear all, We are pleased to announce that on Friday 25 October we will have an IIHE seminar from Dr. Jan Eysermans on the brand-new *W boson mass measurement from the CMS experiment*. The agenda can be found here: https://indico.iihe.ac.be/event/2054/ The seminar will take place at 14:30 in the Sacton seminar room (G.1.03). The abstract of the talk will be added on the agenda soon, but please already save the date. Best regards, Gerrit

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IIHE Seminar Jun 18: Dr. Stefan Maier (The future CMS Tracking system and its Outer Tracker module concept)
by Steven Lowette 18 Jun '24

18 Jun '24

Dear all, On Tuesday June 18 we will have an IIHE seminar from Dr. Stefan Maier: "The future CMS Tracking system and its Outer Tracker module concept" at 14h30 in the Sacton seminar room (G.1.03) Note the exceptional date on a Tuesday! Abstract and short bio are below; the event's agenda can be found here: https://indico.iihe.ac.be/event/1926/ See you there/then, Pascal and Steven ----- Abstract: The talk shortly summarizes the needs to upgrade the current tracking system of the CMS detector and gives insights on some of the key features of the future silicon tracker focusing on the novel double-layered module concept supporting the Level 1 trigger of CMS. Short Bio: Stefan Maier graduated in physics at the Karlsruhe Institute of Technology (KIT) in 2016. His bachelor thesis in 2014 was about the p-stop concentration in 2S sensors, and his master thesis was about an alternative CMS outer tracker (OT) upgrade module concept. He then did his PhD at the Institute of Experimental Particle Physics (ETP) at KIT in 2019 on the subject of high-rate tests on CBC ships for the CMS OT upgrade, and module assembly and test procedures. Since then, He is a Postdoc at the ETP working on the preparation for the OT module assembly and quality control. -- Steven Lowette https://cern.ch/lowette/

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IIHE Seminar Jun 7: Prof. Dr. Matthias Schott (Precision Measurement of the Strong Coupling Constant with Z Boson Kinematics)
by Steven Lowette 07 Jun '24

07 Jun '24

Dear all, On Friday Jun 7 we will have an IIHE seminar from Prof. Dr. Matthias Schott: "Precision Measurement of the Strong Coupling Constant with Z Boson Kinematics" at 14h30 in the Sacton seminar room (G.1.03) Abstract and short bio are below; the event's agenda can be found here: https://indico.iihe.ac.be/event/1925/ Have a nice weekend! Steven. ----- Abstract: The strong coupling constant, alphaS, is one of the fundamental parameters of the Standard Model (SM) of particle physics and describes the strength of the strong interaction. It determines how strongly quarks and gluons as building blocks of protons and neutrons interact with each other. More concretely, alphaS, is one of the three coupling constants within the SM and therefore plays a fundamental role in our ability to describe the universe. The precision measurement of alphaS, is notorious difficult and most experimental measurements yield relative uncertainties of several percent. In recent years, we developed a fundamentally new approach to measure the strong coupling constant using the kinematic properties of Z bosons produced in proton-proton collisions, yielding a relative uncertainty of 0.8% and being the most precise measurement to date. Our approach of this measurement lies in the study of the Z boson kinematics in proton-proton collisions. Using the Z boson for this purpose provides three huge advantages: First of all, its kinematics in proton-proton collisions show a significant dependence on the strong coupling constant; secondly, the kinematics can be precisely predicted and thirdly, once the Z boson is created and decayed in electrons or muons, it does not experience any further effects from the strong interaction. In this talk, we summarize the basic concepts of this measurement. Bio: https://mschott.web.cern.ch/mschott/ -- Steven Lowette https://cern.ch/lowette/

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IIHE Seminar May 31: Dr. Isabelle De Bruyn (The CMS Cathode Strip Chamber Upgrade for HL-LHC)
by Steven Lowette 31 May '24

31 May '24

Dear all, On Friday May 31 we will have an IIHE seminar from Dr. Isabelle De Bruyn: "The CMS Cathode Strip Chamber Upgrade for HL-LHC" at 14h30 in the Sacton seminar room (G.1.03) Abstract and short bio are below; the event's agenda can be found here: https://indico.iihe.ac.be/event/1924/ Kind regards, Steven. ----- Abstract: The CMS muon system consists of 4 different types of muon chambers: drift tubes (DTs), cathode strip chambers (CSCs), resistive plate chambers (RPCs), and gas electron multipliers (GEMs). After an introduction to the CMS muon system, the functioning of the CSCs will be described. The performed upgrade of the CSC electronics during long shutdown 2 will be covered, as well as the remaining upgrade, in view of the HL-LHC. Bio: Isabelle graduated in Physics from Ghent University in Belgium and completed her Master thesis in a research group working with the CMS experiment. During her PhD (obtained in 2018) she continued her involvement with the CMS experiment at the VUB in Brussels and worked on a dark matter search using trackless jets. She then moved to CERN and started working for the University of Wisconsin, Madison, USA. She supervised students working on data analysis, but mostly worked on the Cathode Strip Chamber (CSC) upgrade and operation. More recently, she also took up the role of Muon Upgrade Coordinator and was responsible for the operation of the CSCs. -- Steven Lowette https://cern.ch/lowette/

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IIHE Seminar May 17: Barbara Clerbaux (Experimental review of highlights at this year's Moriond conference)
by Steven Lowette 17 May '24

17 May '24

Dear all, On Friday May 17 we will have an IIHE seminar from our own Barbara Clerbaux: "Experimental review of highlights at this year's Moriond conference" at 14h30 in the Sacton seminar room (G.1.03). The event's agenda can be found here: https://indico.iihe.ac.be/event/1922/ Kind regards, Steven. -- Steven Lowette https://cern.ch/lowette/

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IIHE Seminar May 3: Dr. Cecile Caillol (Observation of the photon-induced production of tau leptons in pp collisions at CMS and constraints on tau g-2)
by Steven Lowette 03 May '24

03 May '24

Dear all, On Friday May 3 we will have an IIHE seminar from Dr. Cecile Caillol: "Observation of the photon-induced production of tau leptons in pp collisions at CMS and constraints on tau g-2" at 14h30 in the Sacton seminar room (G.1.03) Abstract and short bio are below; the event's agenda can be found here: https://indico.iihe.ac.be/event/1922/ Kind regards, Steven. ----- Abstract: The photon-induced production of a pair of tau leptons had been observed in proton-proton collisions with data collected in Run-2 by the CMS detector at the CERN LHC. Signal events are identified thanks to their low track multiplicity around the di-tau vertex. These events are used to set constraints on the anomalous magnetic moment of the tau lepton, significantly improving previous measurements from the LEP era Bio: Dr. Cecile Caillol did her PhD at the Universite Libre de Bruxelles (Belgium) and graduated in 2016. She then joined the University of Wisconsin-Madison until July 2021, when she became an LD staff researcher at CERN. During her PhD and after, she worked on Higgs boson decays to tau leptons, including the first observation of H->tautau decays with 2016 data, and other Higgs boson measurements with tau leptons. She also played a leading role in several exotic Higgs searches. More recently, she has worked on the study of photon-induced processes (this seminar), and the lepton-induced production of leptoquarks. She is currently convener of one of the 3 search groups of CMS (SUS ˜= supersymmetry, dark matter, exotic Higgs). -- Steven Lowette https://cern.ch/lowette/

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IIHE Seminar Apr 12: dr. Elise Wursten (Experiments at the antimatter factory of CERN)
by Steven Lowette 12 Apr '24

12 Apr '24

Dear all, On Friday April 12 we will have an IIHE seminar from Dr. Elisa Wursten: "Experiments at the antimatter factory of CERN" at 14h30 in the Sacton seminar room (G.1.03) Abstract and short bio are below; the event's agenda can be found here: https://indico.iihe.ac.be/event/1920/ Kind regards, Steven. ----- Abstract: The Standard Model of Particle Physics is an extremely powerful model, but it is known to be incomplete. One of its issues is that it does not provide an explanation for the striking imbalance of matter over antimatter observed in our Universe. To better understand the properties of antimatter, the Antiproton Decelerator was inaugurated at CERN in 2000, providing a facility for dedicated studies of low-energy antiprotons and antihydrogen. Since then, an impressive amount of progress has been made, ranging from the efficient production, trapping and laser cooling of antihydrogen to extremely precise spectroscopic measurements and studies of its gravitational behaviour. In this seminar, I will give an overview of the experiments at the antimatter factory of CERN, concisely summarizing their research objectives, their measurements concepts and highlighting the most important results and plans for the future. Bio: Dr. Elise Wursten did her PhD at KULeuven, contributing to the neutron Electric Dipole Moment experiment (nEDM) at the Paul Scherrer Institute in Switzerland, under supeervision of Prof. Nathal Severijns. Interleaved with short periods as Visiting Scientist Fellow of the Max Planck Society, she was from 2018-2020 a CERN Senior Research Fellow and Visiting Scientist at the Ulmer Fundamental Symmetries Laboratory of RIKEN, Japan, working at the Baryon Antibaryon Symmetry Experiment (BASE) at the Antiproton Decelerator of CERN, Switzerland. Since 2021, she is a Special Postdoctoral Researcher affiliated to the Ulmer Fundamental Symmetries Laboratory of RIKEN, Japan, working again at the BASE experiment at CERN. -- Steven Lowette https://cern.ch/lowette/

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IIHE Seminar Apr 5: Prof. Domenico Della Volpe (Opening the PeV era in gamma ray astronomy - LHAASO highlight)
by Steven Lowette 05 Apr '24

05 Apr '24

Dear all, On Friday April 5 we will have an IIHE seminar from Prof. Domenico Della Volpe: "Opening the PeV era in gamma ray astronomy - LHAASO highlight" at 14h30 in the Sacton seminar room (G.1.03) Abstract and short bio are below; the event's agenda can be found here: https://indico.iihe.ac.be/event/1921/ Kind regards, Steven. ----- Abstract: LHAASO has started taking data in 2021 with its full array. With its large field of view and good performance, it has collected a huge amount of high quality data. In this of talk we will illustrate the LHAASO instruments and its performances. Later we will go over major achievements and breakthrough results. In the end, we will also give an outlook at the evolution of the array and LHAASO synergies with future instruments. Bio: Professor Della Volpe currently holds a position as a professor at the University of Geneva, where he contributes significantly to the astroparticle pillar of the department. Additionally, he is actively engaged in medical physics through his leadership role in the POSICS project, which aims to develop an innovative portable gamma/beta camera, generously funded by the EU H2020 program. His primary focus lies within the Cherenkov Telescope Array Observatory (CTAO), with a particular emphasis on the Large Size Telescope (LST) collaboration, where he holds the pivotal role of System Lead Engineer. His significant contribution played a crucial role in the success of the Critical Design Review (CDR) of the LST, a milestone achievement that marked it as the first telescope to meet the stringent qualifications for acceptance into the CTAO. His engagement with LHAASO began in 2017 through a collaboration on the WFCTA Camera, where his group supplied the technology for the focal plane. This contribution was notably acknowledged by LHAASO, particularly noteworthy as his group was the sole non-Chinese participant in the experiment and a member of the Institutional Board, underscoring the significance of their involvement. From 2018 to 2023, Professor Della Volpe chaired the publication committee of LHAASO and served as the main editor of the LHAASO science book. He has also made significant contributions as a contributing author to seminal papers published in prestigious journals such as Nature and Science. His main activity is in CTAO, and in particular in the Large Size telescope collaboration, where he is the System Lead engineer. In the end 2023, he left LHAASO to focus on new projects. He is one of the PI of the QUASAR project, aimed at pushing the boundaries of Intensity Interferometry to achieve micro arc-second resolution using picosecond light detectors. Additionally, he is collaborating on the French-Swiss initiative known as LACTEL, which seeks to implement a pioneering concept of a water Cherenkov detector in Lake Geneva, garnering significant interest from the scientific community, including the South West Galactic Observatory (SWGO). -- Steven Lowette https://cern.ch/lowette/

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IIHE Seminar Mar 29: Prof. Charlotte Van Hulse (Study of hadron structure in ultra-peripheral collisions at the LHC)
by Steven Lowette 29 Mar '24

29 Mar '24

Dear all, On Friday Mar 29 we will have an IIHE seminar from Prof. Charlotte Van Hulse: "Study of hadron structure in ultra-peripheral collisions at the LHC" at 14h30 in the Sacton seminar room (G.1.03) Abstract and short bio are below; the event's agenda can be found here: https://indico.iihe.ac.be/event/1919/ (note that via the top-left you can link the seminar agendas into your agenda, so you never miss one!) Kind regards, Steven. ----- Abstract: The study of exclusive processes in lepton-hadron interactions and in ultra-peripheral hadron-hadron collisions provides information on the three-dimensional distribution of quarks and gluons as a function of their longitudinal momentum and transverse position inside the hadron. Here, the longitudinal direction corresponds to the direction of the probe used to investigate the hadron. An introduction will be given as to how exclusive processes in ultra-peripheral hadron-hadron collisions provide access to the internal structure of the nucleon, and relevant experimental results will be discussed. Where applicable, parallels with measurements in lepton-hadron interactions will be highlighted. Bio: Charlotte Van Hulse is a professor at the University of Alcala in Spain. She did her PhD at Ghent University, where she studied exclusive and semi-inclusive QCD processes in lepton-hadron collisions at the HERMES experiment, at DESY, Hamburg. Subsequently she studied hadron formation in e+e- collisions, at the Belle experiment in Japan, and performed studies for a fixed target at ALICE. Nowadays she focuses on QCD (exclusive and semi-inclusive processes) at the LHCb experiment as well as feasibility/R&D studies for the future electron-ion collider at BNL, USA. -- Steven Lowette https://cern.ch/lowette/

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