L. Lambrecht
A5077698033- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Computational Physics and Python Applications
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Distributed and Parallel Computing Systems
- Big Data Technologies and Applications
- Atomic and Subatomic Physics Research
- Particle Accelerators and Free-Electron Lasers
- Optical properties and cooling technologies in crystalline materials
- Stochastic processes and financial applications
- Anomaly Detection Techniques and Applications
- Noncommutative and Quantum Gravity Theories
- Laser-Plasma Interactions and Diagnostics
- Scientific Computing and Data Management
- Radiation Therapy and Dosimetry
- Nuclear Physics and Applications
- Random Matrices and Applications
- Nuclear physics research studies
- Noise Effects and Management
Ghent University Hospital
2021-2025
Institute of High Energy Physics
2022-2024
A. Alikhanyan National Laboratory
2022-2024
University of Antwerp
2024
Ghent University
2022-2023
In July 2012, the ATLAS and CMS collaborations at CERN Large Hadron Collider announced observation of a Higgs boson mass around 125 gigaelectronvolts. Ten years later, with data corresponding to production 30-times larger number bosons, we have learnt much more about properties boson. The experiment has observed in numerous fermionic bosonic decay channels, established its spin-parity quantum numbers, determined measured cross-sections various modes. Here Collaboration reports most...
Measurements are presented of the Bs0→μ+μ− branching fraction and effective lifetime, as well results a search for B0→μ+μ− decay in proton-proton collisions at s=13TeV LHC. The analysis is based on data collected with CMS detector 2016–2018 corresponding to an integrated luminosity 140fb−1. Bs0 meson lifetime most precise single measurements date. No evidence has been found. All found be consistent standard model predictions previous measurements.
A bstract Three searches are presented for signatures of physics beyond the standard model (SM) in ττ final states proton-proton collisions at LHC, using a data sample collected with CMS detector $$ \sqrt{s} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 13 TeV, corresponding to an integrated luminosity 138 fb − 1 . Upper limits 95% confidence level (CL) set on products branching fraction decay into τ leptons and cross...
A search is reported for near-threshold structures in the <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mi>J</a:mi><a:mo>/</a:mo><a:mi>ψ</a:mi><a:mi>J</a:mi><a:mo>/</a:mo><a:mi>ψ</a:mi></a:mrow></a:math> invariant mass spectrum produced proton-proton collisions at <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mrow><c:msqrt><c:mrow><c:mi>s</c:mi></c:mrow></c:msqrt><c:mo>=</c:mo><c:mn>13</c:mn><c:mtext> </c:mtext><c:mtext>...
Abstract This paper describes the Combine software package used for statistical analyses by CMS Collaboration. The package, originally designed to perform searches a Higgs boson and combined analysis of those searches, has evolved become tool presently in majority measurements performed It is not specific experiment, this intended serve as reference users outside Collaboration, providing an outline most salient features capabilities. Readers are provided with possibility run reproduce...
A bstract Measurements of Higgs boson production cross sections and couplings in events where the decays into a pair photons are reported. Events selected from sample proton-proton collisions at $$ \sqrt{s} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 13 TeV collected by CMS detector LHC 2016 to 2018, corresponding an integrated luminosity 137 fb − 1 . Analysis categories enriched produced via gluon fusion, vector...
A search for supersymmetry in events with two or three low-momentum leptons and missing transverse momentum is performed. The uses proton-proton collisions at $\sqrt{s} =$ 13 TeV collected the three-year period 2016-2018 by CMS experiment LHC corresponding to an integrated luminosity of up 137 fb$^{-1}$. data are found be agreement expectations from standard model processes. results interpreted terms electroweakino top squark pair production a small mass difference between produced...
A bstract search for heavy neutral leptons (HNLs), the right-handed Dirac or Majorana neutrinos, is performed in final states with three charged (electrons muons) using proton-proton collision data collected by CMS experiment at $$ \sqrt{s} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 13 TeV CERN LHC. The correspond to an integrated luminosity of 138 fb − 1 . HNLs could be produced through mixing standard model neutrinos...
This Letter presents a search for direct production of charginos and neutralinos via electroweak interactions. The results are based on data from proton-proton collisions at center-of-mass energy 13 TeV collected with the CMS detector LHC, corresponding to an integrated luminosity 137 fb$^{-1}$. considers final states large missing transverse momentum pairs hadronically decaying bosons WW, WZ, WH, where H is Higgs boson. These identified using novel algorithms. No significant excess events...
Since the initial data taking of CERN LHC, CMS experiment has undergone substantial upgrades and improvements. This paper discusses detector as it is configured for third data-taking period Run 3, which started in 2022. The entire silicon pixel tracking was replaced. A new powering system superconducting solenoid installed. electronics hadron calorimeter upgraded. All muon electronic systems were upgraded, stations added, including a gas electron multiplier detector. precision proton...
A bstract search is presented for vector-like T and B quark-antiquark pairs produced in proton-proton collisions at a center-of-mass energy of 13 TeV. Data were collected by the CMS experiment CERN LHC 2016–2018, with an integrated luminosity 138 fb − 1 . Events are separated into single-lepton, same-sign charge dilepton, multi-lepton channels. In analysis single-lepton channel multilayer neural network jet identification techniques employed to select signal events, while dilepton...
A search for decays to invisible particles of Higgs bosons produced in association with a top-antitop quark pair or vector boson, which both decay fully hadronic final state, has been performed using proton-proton collision data collected at s=13TeV by the CMS experiment LHC, corresponding an integrated luminosity 138fb-1. The 95% confidence level upper limit set on branching fraction 125GeV boson particles, B(H→inv), is 0.54 (0.39 expected), assuming standard model production cross...
Decays of $Z$ bosons to charm quark-antiquark pairs have been observed for the first time at a hadron collider, as part search decays Higgs pairs, which are bounded 14 times standard model value.
Abstract A test of lepton flavor universality in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:msup> <mml:mtext>B</mml:mtext> <mml:mo>±</mml:mo> </mml:mrow> </mml:msup> <mml:mo accent="false" stretchy="false">→</mml:mo> <mml:mtext>K</mml:mtext> <mml:mi>μ</mml:mi> <mml:mo>+</mml:mo> <mml:mo>−</mml:mo> </mml:math> and <mml:mtext>e</mml:mtext> decays, as well a measurement differential integrated branching fractions nonresonant decay are presented....
Energy correlators that describe energy-weighted distances between two or three particles in a hadronic jet are measured using an event sample of sqrt[s]=13 TeV proton-proton collisions collected by the CMS experiment and corresponding to integrated luminosity 36.3 fb^{-1}. The distributions consistent with trends simulation reveal key features strong interaction: confinement asymptotic freedom. By comparing ratio three- two-particle energy correlator theoretical calculations resum collinear...
The $\Xi^-_\mathrm{b} \pi^+ \pi^-$ invariant mass spectrum is investigated with an event sample of proton-proton collisions at $\sqrt{s} = $ 13 TeV, collected by the CMS experiment LHC in 2016-2018 and corresponding to integrated luminosity 140 fb$^{-1}$. ground state $\Xi^-_\mathrm{b}$ reconstructed via its decays J$/\psi$ $\Xi^-$ $\Lambda$ K$^-$. A narrow resonance, labeled $\Xi_\mathrm{b}$(6100)$^-$, observed a 6100.3 $\pm$ 0.2 (stat) 0.1 (syst) 0.6 ($\Xi^-_\mathrm{b}$) MeV, where last...
Studies of $CP$ violation and anomalous couplings the Higgs boson to vector bosons fermions are presented. The data were acquired by CMS experiment at LHC correspond an integrated luminosity $137\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ a proton-proton collision energy 13 TeV. kinematic effects in boson's four-lepton decay $H\ensuremath{\rightarrow}4\ensuremath{\ell}$ its production association with two jets, boson, or top quarks analyzed, using full detector simulation matrix element...
A bstract The first collider search for dark matter arising from a strongly coupled hidden sector is presented and uses data sample corresponding to 138 fb −1 , collected with the CMS detector at CERN LHC, $$ \sqrt{s} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 13 TeV. hypothesized couple standard model (SM) via heavy leptophobic Z′ mediator produced as resonance in proton-proton collisions. decay results two...
A bstract measurement of the inclusive jet production in proton-proton collisions at LHC $$ \sqrt{s} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msqrt><mml:mi>s</mml:mi></mml:msqrt></mml:math> = 13 TeV is presented. The double-differential cross sections are measured as a function transverse momentum p T and absolute rapidity |y| . anti- k clustering algorithm used with distance parameter 0.4 (0.7) phase space region from 97 GeV up to 3.1 < 2 0. Data collected CMS...
The observation of the production four top quarks in proton-proton collisions is reported, based on a data sample collected by CMS experiment at center-of-mass energy 13 TeV 2016–2018 CERN LHC and corresponding to an integrated luminosity 138fb−1. Events with two same-sign, three, or charged leptons (electrons muons) additional jets are analyzed. Compared previous results these channels, updated identification techniques for originating from hadronization b quarks, as well revised...
Abstract Measurements of Higgs boson production, where the decays into a pair $$\uptau $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>τ</mml:mi> </mml:math> leptons, are presented, using sample proton-proton collisions collected with CMS experiment at center-of-mass energy "Equation missing"<!-- image only, no MathML or LaTex -->, corresponding to an integrated luminosity 138 $$\,\text {fb}^{-1}$$ <mml:mrow> <mml:mspace /> <mml:msup> <mml:mtext>fb</mml:mtext>...
Production cross sections of the standard model Higgs boson decaying to a pair W bosons are measured in proton-proton collisions at center-of-mass energy 13TeV. The analysis targets produced via gluon fusion, vector and association with or Z boson. Candidate events required have least two charged leptons moderate missing transverse momentum, targeting one leptonically originating from Results presented form inclusive differential simplified template section framework, as well couplings...
A search for the direct production of a pair $\ensuremath{\tau}$ sleptons, supersymmetric partners leptons, is presented. Each slepton assumed to decay lepton and lightest particle (LSP), which be stable not interact in detector, leading an imbalance total reconstructed transverse momentum. The carried out events identified as containing two each decaying one or more hadrons neutrino, significant momentum imbalance. In addition scenarios sleptons promptly, also addresses have sufficiently...
A search is presented for charged, long-lived supersymmetric particles in final states with one or more disappearing tracks. The based on data from proton-proton collisions at a center-of-mass energy of 13 TeV collected the CMS detector CERN LHC between 2016 and 2018, corresponding to an integrated luminosity <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mn>137</a:mn><a:mtext> </a:mtext><a:mtext>...