IRN@ZOOM

5 juil. 2021, 14:00 → 6 juil. 2021, 16:00 Europe/Paris

The IRN meeting will be held on zoom only.

Information regarding the Zoom connection will be sent by email to registered participants (registration still open, please register!)

Please contact the coordinators of the corresponding session if you would like to give a talk:

Higgs	Nicolas Morange , Christophe Ochando , Pietro Slavich
BSM	Eric Chabert , Björn Herrmann , Romain Madar , Jérémie Quevillon
Dark Universe	Julien Masbou, Emmanuel Moulin, Kallia Petraki
Methods and Tools	Anja Butter, Samuel Calvet, Eric Conte

More information at terascale.in2p3.fr

lundi 5 juillet

1 Welcome

Orateurs: Dirk Zerwas (IJCLab), Gilbert Moultaka (L2C Montpellier, UMR5221-UM2/INP/CNRS)

210705_ZoomIntro.pdf

Higgs

2 Higgs boson self-coupling constraints from single Higgs, double Higgs and Electroweak measurements

Orateur: Eleonora Rossi

ER_selfcoupling_IRN_0507.pdf

3 ATLAS HH->bbyy

Orateur: Raphaël Hulsken

Terascale_HULSKEN.pdf

4 CMS HH->bbbb

Orateur: Luca Cadamuro (LLR)

HH_bbbb_IDR.pdf

5 SMEFT: the new Standard Model

Orateur: Veronica Sanz (CERN and York)

IRNTerascale.pdf

15:40 Coffee/Tea

Methods and Tools

6 SModelS

Orateur: Gaël Alguero (LPSC Grenoble)

smodels_irn2021.pdf

7 Collider Phenomenology & LHC Recasting with MadAnalysis 5

Orateur: Jack Araz (IPPP - Durham University)

Collider Phenomenology & LHC Recasting with MadAnalysis 5

MadAnalysis 5 home page

MadAnalysis 5 - launchpad

Public Analysis Database

Talks

Tutorials

8 Symbolic Regression for Optimal Observables

Orateur: Nathalie Soybelman (Universität Heidelberg)

IRN_optimalobservable.pdf

9 How to GAN Event Unweighting

Orateur: Mathias Backes ( ITP Heidelberg)

uwGAN_mbackes.pdf

10 Scientific management committee meeting

IRN SMC meeting July 2021.pdf

mardi 6 juillet

BSM

11 Multi-purpose Single Lepton Searches at the LHC

Orateur: Saurabh Nangia (Uni Bonn)

SaurabhNangia_Terascale_July2021.pdf

12 Catching Heavy Vector Triplets with the SMEFT: from one-loop matching to phenomenology

Orateur: Emma Geoffray (Uni Heidelberg)

IRN_Geoffray_handout.pdf

13 CP-violating observables computed in the SMEFT at leading BSM order

Orateur: Quentin Bonnefoy (DESY Hamburg)

Bonnefoy_IRN.pdf

14 Dark matter and lepton flavour phenomenology in a scotogenic-like model

Orateur: Maud Sarazin (LAPTh Annecy)

IRN_Terrascale(1).pdf

15 Brane-Higgs fields

Orateur: Grégory Moreau (IJCLab Orsay)

Inter-orbi_Higgs_Terascale.pdf

10:30 Coffee/Tea

Dark Universe

16 Interplay Between Dark Matter Freeze Out/In and Primordial Black Hole Evaporation

In this talk, I will present the phenomenology of dark-matter production in the case where it is both produced by a freeze-out or freeze-in mechanism and by the evaporation of primordial black holes. I will show that the presence of a vector mediator between the hidden and the visible sector affects the production of dark-matter particles as well as its phase space distribution. I will also show that the population of DM particles produced by evaporation may be warm enough to re-thermalize with the pre-existing DM relic abundance, leading to non-trivial imprints on the value of the relic abundance at later time.

Orateur: Lucien Heurtier (CPHT, Ecole Polytechnique)

Heurtier.pdf

17 Baryogenesis via relativistic bubble expansion

We consider a novel baryogenesis mechanism in which the asymmetry is sourced from heavy particles which either gain their mass or are created during bubble expansion in a strong first order phase transition. The particles are inherently out-of-equilibrium and sufficiently dilute after wall crossing so --- even with order one gauge interactions --- the third Sakharov condition is easily met. Washout is avoided provided the reheat temperature is sufficiently below the scale of the heavy particles. We present a simple example model and discuss the restrictions on the parameter space for the mechanism to be successful. We show the reheat temperature is bounded by T_RH > 10^10 GeV for the observed asymmetry to be generated with typical vacuum energy differences expected in microphysical models (lower reheat temperatures are possible if the vacuum energy difference is further suppressed). The mechanism relies on moderate supercooling and relativistic walls which --- in contrast to electroweak baryogenesis --- leads to a sizable gravitational wave signal.

Orateur: Iason Baldes (Universite Libre de Bruxelles)

Baldes_IRN_nopause.pdf

18 Integral X-ray constraints on sub-GeV dark matter

Dark matter (DM) in cosmic structures is expected to produce signals originating from its particle physics nature, among which the electromagnetic emission represents a relevant opportunity. One of the major candidates for DM are weak-scale particles, however no convincing signal of them has been observed so far. For this reason, alternative candidates are getting increasing attention, notably sub-GeV particles, which are the subject of our work. The challenge in indirect detection of sub-GeV DM is that there is scarcity of competitive experiments in the energy range between 1 MeV and hundreds of MeV, hence we need to find alternative ways to study DM candidates with mass in this energy window. In our work we proposed to look at energies much lower than the mass of the sub-GeV DM particles by including the contribution from Inverse-Compton scattering in the total flux. In particular, the electrons and positrons produced by DM particles give rise to X-rays by upscattering the low-energy photons of the radiation fields in the Galaxy (CMB, infrared from dust, optical starlight). These X-rays fall in the energy range covered by the INTEGRAL data, which we used to determine conservative bounds on the DM annihilation cross-section. We considered three annihilation channels: electron, muon and pion. As a result, we derived competitive constraints for DM particles with a mass between 150 MeV and 1.5 GeV.

Orateur: Elena Pinetti

talk_Pinetti.pdf

19 Search for dark matter annihilation signals from unidentified Fermi-LAT objects with H.E.S.S.

Cosmological N-body simulations show that Milky Way-sized galaxies harbor a population of unmerged dark matter subhalos. These subhalos could shine in gamma-rays and be eventually detected as unidentified sources in gamma-ray surveys. From a thorough selection of unidentified Fermi-LAT Objects (UFOs), we observe four UFOs with H.E.S.S. and we search for very high-energy (VHE, E ≥ 100 GeV) gamma-ray emission. Considering dark matter masses above a few hundred GeV, the observed UFOs could be identified as dark matter subhalos, given their hard gamma-ray spectra in the few-ten-to-hundred GeV energy range. Since no significant very-high-energy gamma-ray emission is detected in any of the four UFOs dataset nor in the combined one, we derive constraints on the product of the velocity-weighted annihilation cross section <sigma v> by the J-factor for the dark matter models. We derive 95% CL upper limits on <sigma v>J in W+W- and tau+tau- annihilation channels for the TeV dark matter particles. Focusing on thermal WIMPs, we derive constraints on the J-factors from the H.E.S.S. observations. The dark matter models with masses greater than 0.3 TeV for the UFO emissions can be ruled out at high confidence level when assuming model-dependent predictions from cosmological N-body simulations on the J-factor distribution for Milky Way-sized galaxies.

Orateur: Alessandro Montanari

UFOs_IRN.pdf

20 Dark Matter search in the Galactic Center with the ARCA KM3NeT detector

The KM3NeT detector is a next generation neutrino telescope currently under construction in the Mediterranean sea. The detector is distributed in two sites each with a specific goal. The first of the detectors, called ARCA (Astroparticle Research with Cosmics in the Abyss) and located South of Sicily, is focused on astrophysical research. The second one, ORCA (Oscillation Research with Cosmics in the Abyss called ORCA) and located south of France, is focused on the study of neutrino properties. Six detection units in each of the sites are currently operating, some of them since more than one year. More detection units are planned to be deployed during the rest of the year. KM3NeT can look for some forms of dark matter through the effects of its annihilation in astrophysical objects.
We present in this talk the different components and procedures required to compute the sensitivity of the ARCA detector to dark matter annihilation in the Galactic Centre. We show some of preliminary results and how they compare to other neutrino telescopes and other dark matter search techniques.

Orateur: Camiel Pieterse

IRNTeraScale_Final.pdf

21 Famous last words

Orateurs: Ana M. Teixeira (LPC Clermont), Marie-Helene Genest (LPSC-Grenoble, CNRS/UGA (FR))