Particle physics – study of the elementary constituents of matter – is one of IP2I’s main activities. Through the development of a calorimeter for the future linear accelerator, the direct measurement of antihydrogen acceleration due to Earth’s gravitation and the research conducted on the Higgs boson at the LHC, the FLC (CALICE), AEgIS and CMS teams are helping to assemble the puzzle for an understanding of our universe.

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The team’s objective is to develop a high granularity hadronic calorimeter to equip future leptonic gas pedals. The calorimeter proposed for the FLC is entitled Semi-Digital Hadronic Calorimeter (SDHCAL). It uses RPC (resistive plate chamber) type gas detectors as active medium, read by integrated electronics with a granularity of 1cm2. The RPCs are inserted in a compact mechanical structure that acts as an absorber.

This type of calorimeter is used to measure the energy of the hadrons produced during collisions in particle gas pedals: on reaching the hadron calorimeter, they will deposit their energy in it by creating a sheaf of particles (called a jet) whose shape and size make it possible to identify it and measure its energy. The high granularity of the detector is therefore essential to increase its performance.

The team, with its partners, has built the first prototype of this new generation of calorimeters, as well as the associated electronics, and has designed Particle Flow Algorithms (PFA) to improve the reconstruction of the jets resulting from the interactions and to precisely measure their energy. Several tests at CERN have demonstrated the great power of SDHCAL.

The team contributed to the realization of the TOMUVOL detector for volcano tomography. It has developed a new reading scheme for large detectors with a reduced number of electronic channels while maintaining high granularity.

SDHCAL Prototype

Activities

  • Organization of several beam tests of the SDHCAL prototype at CERN (2015, 16, 17 and 18) and exploitation of the data for the study of hadronic showers.
  • Development of the full simulation of the SDHCAL prototype as well as the SDHCAL in ILD and CEPC.
  • Design, construction and operation of the TOMUVOL detector with LPC.
  • Design and realization of large RPC detectors (2 m2) and new reading electronics for module0 of SDHCAL for the ILD ILC project.
  • Participation in the drafting of the ILD-ILC DBD and in the CDR of the CEPC project.
  • Design and realization of the large reading cards for RPC chambers for the muon CMS upgrade project using timing.
  • Design of a new ZDAQ acquisition system
  • Design of a new reading card for gas detectors (PCT/EP2018/053561-EN3062926)
  • Development of PFA algorithms (ArborPFA/APRIL)
  • Development of a new material for RPC detectors to increase their detection rate by a factor of 1000.
  • Design and realization of a detection system for homeland security for the company Smiths Detection based on the patent. Financing by PULSALYS.
  • Co-organization of the CHEF conferences on calorimetry.

 

Interaction of a pion (left) and an electron (right) in SDHCAL

 

Measurement of hadron beam energy at CERN (left: linearity, right: resolution)

Knit Pads for Reading Gas Detectors (PCT/EP2018/053561-EN3062926)

The AEgIS (Antihydrogen Experiment: Gravity, Interferometry, Spectroscopy) team at IP2I is working on the experiment of the same name carried out at CERN. The aim is to make the first direct measurement of the effects of gravitation on antimatter by observing the fall of antihydrogen atoms.

Researchers use antiprotons to produce a beam of antihydrogen atoms that is sent into a device called a Moire deflectometer. Combined with a position detector, this allows them to measure the magnitude of the gravitational interaction between matter (Earth) and antimatter (antihydrogen) to an accuracy of 1%.

The deflectometer is equipped with a grid system that divides the antihydrogen beam into parallel beams, creating a periodic structure whose analysis allows the deflection of the antihydrogen beam during its horizontal flight to be determined. By combining this measurement with the time of flight, we can then measure the gravitational force exerted on the antihydrogen atoms.

The AEgIS collaboration brings together physicists from all over Europe and faces many technical challenges such as the use of very low temperatures (0.1° K), ultra-vacuum (10-11 mbar), high magnetic fields (1 and 5 T), Lyman lasers α to characterize antihydrogen jets, the production of excited positronium, antiprotons, etc…

Our team built the hydrogen ion beam used to characterize the deflectometer’s moirĂ© arrays.

Latest documents

  • Aram Hayrapetyan, Armen Tumasyan, Wolfgang Adam, Janik Walter Andrejkovic, Thomas Bergauer, et al.. Girth and groomed radius of jets recoiling against isolated photons in lead-lead and proton-proton collisions at \sqrt{s_\mathrm{NN}} = 5.02 TeV. 2024. ⟨hal-04570911⟩
  • Aram Hayrapetyan, Armen Tumasyan, Wolfgang Adam, Janik Walter Andrejkovic, Thomas Bergauer, et al.. Search for new resonances decaying to pairs of merged diphotons in proton-proton collisions at \sqrt{s} = 13 TeV. 2024. ⟨hal-04570560⟩
  • Aram Hayrapetyan, Armen Tumasyan, Wolfgang Adam, Janik Walter Andrejkovic, Thomas Bergauer, et al.. Search for the Z boson decay to \tau\tau\mu\mu in proton-proton collisions at \sqrt{s} = 13 TeV. 2024. ⟨hal-04563873⟩
  • Aram Hayrapetyan, Armen Tumasyan, Wolfgang Adam, Janik Walter Andrejkovic, Thomas Bergauer, et al.. Performance of CMS muon reconstruction from proton-proton to heavy ion collisions. 2024. ⟨hal-04562288⟩
  • Aram Hayrapetyan, Armen Tumasyan, Wolfgang Adam, Janik Walter Andrejkovic, Thomas Bergauer, et al.. Measurement of multijet azimuthal correlations and determination of the strong coupling in proton-proton collisions at \sqrt{s} = 13 TeV. 2024. ⟨hal-04560700⟩
  • Aram Hayrapetyan, Armen Tumasyan, Wolfgang Adam, Janik Walter Andrejkovic, Thomas Bergauer, et al.. Search for Higgs boson pair production with one associated vector boson in proton-proton collisions at \sqrt{s} = 13 TeV. 2024. ⟨hal-04556366⟩
  • Aram Hayrapetyan, Armen Tumasyan, Wolfgang Adam, Janik Walter Andrejkovic, Thomas Bergauer, et al.. The CMS Statistical Analysis and Combination Tool: COMBINE. 2024. ⟨hal-04556512⟩
  • W Adam, T Bergauer, K Damanakis, M Dragicevic, R FrĂĽhwirth, et al.. Beam Test Performance Studies of CMS Phase-2 Outer Tracker Module Prototypes. 2024. ⟨hal-04556634⟩
  • Aram Hayrapetyan, Armen Tumasyan, Wolfgang Adam, Janik Walter Andrejkovic, Thomas Bergauer, et al.. Searches for pair-produced multijet resonances using data scouting in proton-proton collisions at \sqrt{s} = 13 TeV. 2024. ⟨hal-04538473⟩
  • Aram Hayrapetyan, Armen Tumasyan, Wolfgang Adam, Janik Walter Andrejkovic, Thomas Bergauer, et al.. Measurement of differential ZZ+jets production cross sections in pp collisions at \sqrt{s} = 13 TeV. 2024. ⟨hal-04537862⟩
  • Aram Hayrapetyan, Armen Tumasyan, Wolfgang Adam, Janik Walter Andrejkovic, Thomas Bergauer, et al.. Performance of the CMS electromagnetic calorimeter in pp collisions at \sqrt{s} = 13 TeV. 2024. ⟨hal-04529137⟩
  • Aram Hayrapetyan, Armen Tumasyan, Wolfgang Adam, Janik Walter Andrejkovic, Thomas Bergauer, et al.. Searches for Higgs boson production through decays of heavy resonances. 2024. ⟨hal-04529639⟩
  • Aram Hayrapetyan, Armen Tumasyan, Wolfgang Adam, Janik Walter Andrejkovic, Thomas Bergauer, et al.. Search for ZZ and ZH production in the \mathrm{b\bar{b}b\bar{b}} final state using proton-proton collisions at \sqrt{s} = 13 TeV. 2024. ⟨hal-04529141⟩
  • Aram Hayrapetyan, Armen Tumasyan, Wolfgang Adam, Janik Walter Andrejkovic, Thomas Bergauer, et al.. Measurement of the production cross section of a Higgs boson with large transverse momentum in its decays to a pair of \tau leptons in proton-proton collisions at \sqrt{s} = 13 TeV. 2024. ⟨hal-04529142⟩
  • Aram Hayrapetyan, Armen Tumasyan, Wolfgang Adam, Janik Walter Andrejkovic, Thomas Bergauer, et al.. Enriching the physics program of the CMS experiment via data scouting and data parking. 2024. ⟨hal-04529636⟩
  • Aram Hayrapetyan, Armen Tumasyan, Wolfgang Adam, Janik Walter Andrejkovic, Thomas Bergauer, et al.. Search for long-lived heavy neutrinos in the decays of B mesons produced in proton-proton collisions at \sqrt{s} = 13 TeV. 2024. ⟨hal-04515185⟩
  • Aram Hayrapetyan, Armen Tumasyan, Wolfgang Adam, Janik Walter Andrejkovic, Thomas Bergauer, et al.. Observation of the J/

        \psi<span class="ql-right-eqno">   </span><span class="ql-left-eqno">   </span><img src="https://www.ip2i.in2p3.fr/wp-content/ql-cache/quicklatex.com-727b71bbd4d7411799b9c1aa60742660_l3.png" height="10" width="17" class="ql-img-displayed-equation quicklatex-auto-format" alt="\[\to\]" title="Rendered by QuickLaTeX.com"/>\mu^+\mu^-\mu^+\mu^-

    decay in proton-proton collisions at \sqrt{s} = 13 TeV. 2024. ⟨hal-04515183⟩
  • Aram Hayrapetyan, Armen Tumasyan, Wolfgang Adam, Janik Walter Andrejkovic, Thomas Bergauer, et al.. Search for new physics with emerging jets in proton-proton collisions at \sqrt{s} = 13 TeV. 2024. ⟨hal-04515179⟩
  • Aram Hayrapetyan, Armen Tumasyan, Wolfgang Adam, Janik Walter Andrejkovic, Thomas Bergauer, et al.. Search for soft unclustered energy patterns in proton-proton collisions at 13 TeV. 2024. ⟨hal-04515188⟩
  • Aram Hayrapetyan, Armen Tumasyan, Wolfgang Adam, Janik Walter Andrejkovic, Thomas Bergauer, et al.. Search for the decay of the Higgs boson to a pair of light pseudoscalar bosons in the final state with four bottom quarks in proton-proton collisions at \sqrt{s} = 13 TeV. 2024. ⟨hal-04513660⟩
  • Aram Hayrapetyan, Armen Tumasyan, Wolfgang Adam, Janik Walter Andrejkovic, Thomas Bergauer, et al.. Search for Higgs boson pair production in the bbWW decay mode in proton-proton collisions at \sqrt{s} = 13 TeV. 2024. ⟨hal-04513656⟩
  • Aram Hayrapetyan, Armen Tumasyan, Wolfgang Adam, Janik Walter Andrejkovic, Thomas Bergauer, et al.. Constraints on anomalous Higgs boson couplings from its production and decay using the WW channel in proton-proton collisions at \sqrt{s} = 13 TeV. 2024. ⟨hal-04511744⟩
  • Aram Hayrapetyan, Armen Tumasyan, Wolfgang Adam, Janik Walter Andrejkovic, Thomas Bergauer, et al.. Review of top quark mass measurements in CMS. 2024. ⟨hal-04511743⟩
  • L Quaglia, M Abbrescia, G Aielli, R Aly, M.C Arena, et al.. Exploring Eco-Friendly Gas Mixtures for Resistive Plate Chambers: A Comprehensive Study on Performance and Aging. 2024. ⟨hal-04505938⟩