May 2024 - Seminars-iihe - listserv.vub.be

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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