Journées de Rencontre Jeunes Chercheurs 2023

Session

Standard Model

23 oct. 2023, 09:30

Présidents de session

Standard Model

• Olivier Davignon (Laboratoire Leprince-Ringuet)

Standard Model

• Olivier Davignon (Laboratoire Leprince-Ringuet)

Standard Model

• Olivier Davignon (Laboratoire Leprince-Ringuet)

Standard Model

• Olivier Davignon (Laboratoire Leprince-Ringuet)

Standard Model

• Alexis VALLIER (L2I Toulouse, CNRS/IN2P3, UT3)

5. Session Overview

Olivier Davignon (Laboratoire Leprince-Ringuet)

23/10/2023 09:30

64. Combined fit of the hadronic tau energy scale and the identification scale factor

Océane Poncet

23/10/2023 10:00

Standard Model

A new method is presented for calibrating hadronic tau leptons ($\tau_h$) using $Z \rightarrow \mu \tau_h$ events, recorded by CMS experiment during 2018 at $\sqrt{s}$ = 13 TeV. The calibration is performed using data samples that reconstruct the decay of a Z boson into $\tau_{\mu}\tau_h$. By reconstructing the invariant visible mass from the visible decay products, a distribution is obtained...

78. $B^0_{d(s)}\to K^0_Shh’$ branching fraction measurement at LHCb, first time integrated amplitude analysis of $B^0_s\to K^0_S\pi^+\pi^-$ and feasibility study of $B^0_d\to K^{*0}\tau^+\tau^-$ at FCC-$ee$.

Tristan Miralles

23/10/2023 11:00

Standard Model

The first part of the presentation is focused on a current LHCb analysis about the measurement of the branching fraction of the $B^0_{d(s)}\to K^0_Shh’$ modes, where $h$ and $h’$ could denotes a pion or a kaon, by using the LHCb Run1 and Run2 data. The first goal of the analysis is to measure the $B^0_d\to K^0_S K^+K^-$ decay mode unobserved to date. The second goal of the study is to update...

53. Measurement of the CKM angle $\gamma$ in $B^\pm\rightarrow D^0(\rightarrow K_s^0\pi^+\pi^-\pi^0)K^\pm$ decays at LHCb

jessy daniel

23/10/2023 11:30

Standard Model

The observable Universe is mainly made up of matter, while almost all the antimatter disappeared in the very early times. One explanation is that the Universe obeys the Sakharov conditions, which mean the existence of a C (charge) and CP (charge - parity) symmetry violation. An area of Particle Physics deals with the comprehension and measurement of this symmetry breaking and the potential...

58. Jet Calibration with the ATLAS detector

Line Delagrange (LPNHE, Paris, France)

23/10/2023 12:00

Standard Model

Jets are collimated sprays of particles that stem from the emission of a quark or a gluon. They are crucial for many Standard Model measurements and search for new physics and they are ubiquitous in high energy proton-proton collisions environments, such as at LHC. The goal of jet calibration is to get the true 4-momentum of the jet, which is that of the particle initiating it, from the...

74. Simultaneous jet calibration with ML including in situ JER measurement

Laura Sara Boggia (CNRS)

23/10/2023 14:00

Standard Model

In the current ATLAS jet calibration procedure, the GSC/GNNC methods are applied to improve the Jet Energy Resolution (JER) followed by various methods measuring the JER in situ and correcting it.
This project focuses on merging several aspects of the jet calibration chain, combining a NN-based calibration procedure with a loss function that minimises the JER directly in data. As a first...

61. Combined angular analysis of $ B \to D^{*} e \nu_{e}$ and $ B \to D^{*} \mu \nu_{\mu}$ with the LHCb detector

Bogdan Kutsenko (Aix Marseille Univ, CNRS/IN2P3, CPPM, Marseille, France)

23/10/2023 14:30

Standard Model

Several intriguing hints on deviations from the SM predictions have appeared in the studies of decays of B hadrons (hadrons containing the beauty (b) quark) involving leptons. The standard model contains three lepton families: electrons, muons, and tau-leptons, each accompanied by the corresponding type of neutrino. The most striking deviation is the hint on violation of lepton flavor...

66. High-throughput GNN track reconstruction at LHCb

Fotis Giasemis

23/10/2023 15:00

Standard Model

Over the next decade, increases in instantaneous luminosity and detector granularity will increase the amount of data that has to be analyzed by high-energy physics experiments, whether in real time or offline, by an order of magnitude. The reconstruction of charged
particles, which has always been a crucial element of offline data processing pipelines, must increasingly be deployed from the...

81. Improving Tracking Algorithms for ITk Detector at the HL-LHC

Jeremy Couthures (ATLAS LAPP)

23/10/2023 15:30

Standard Model

In anticipation of the High-Luminosity phase of the Large Hadron Collider at CERN (HL-LHC), the ATLAS experiment is upgrading its innermost detector to the new Inner Tracker (ITk), characterized by its wider coverage and increased granularity. While this new detector promises enhanced spatial resolution for track measurements, its combination with the increased luminosity of the HL-LHC poses a...

80. 3D Clustering in the CMS High Granularity Calorimeter

Isaac EHLE (Laboratoire Leprince-Ringuet, Institut Polytechnique Paris)

23/10/2023 16:30

Standard Model

In 2029, the High Luminosity phase of the LHC (HL-LHC) is planned to begin taking data, bringing an unprecedented level of radiation and average particle interactions per brunch-crossing (pileup/PU). In order to preserve the same physics performance that the CMS detector achieves now, the collaboration has decided to replace the endcaps of the current electromagnetic and hadronic calorimeters...

77. Vector boson scattering in the ATLAS detector

Mathieu Markovitch (IJCLab)

25/10/2023 09:30

Standard Model

Vector boson scattering (VBS) processes probe the fundamental structure of electroweak interactions and provide a high sensitivity to new physics (NP) phenomena affecting gauge and Higgs couplings. These processes are among the rarest ones in the Standard Model (SM) and were observed during last years in the Large Hadron Collider (LHC). The semileptonic final state, where one of the scattered...

27. Talk Flavor #1

jessy daniel

28. Talk Flavor #2

Tristan Miralles

29. Talk Flavor #3

Yann Monceaux (IP2I (Lyon))

43. Talk SM #1

Jeremy Couthures (ATLAS LAPP)

44. Talk SM #2

Line Delagrange (LPNHE, Paris, France)

45. Talk SM #3

Mathieu Markovitch (IJCLab)

46. Talk SM #4

Océane Poncet (IPHC)

69. Talk theory #2

Yann Monceaux (IP2I (Lyon))