IRN Terascale @ LPSC Grenoble

24 avr. 2023, 12:00 → 26 avr. 2023, 17:00 Europe/Paris

Grand Amphi (LPSC Grenoble)

Jérémie Quevillon (LPSC Grenoble), Sabine Kraml (LPSC Grenoble)

We are looking forward to welcoming you for the spring meeting of the IRN Terascale at the LPSC Grenoble on 24-26 April 2023.

Registrations are open until April 9. For organisational reasons we would like to ask however that you register as soon as possible.

NEW: Wednesday April 26th afternoon we plan a joint session with the GDR QCD tools group.

Do not forget to inform your local Scientific Management Committee member (see terascale.in2p3.fr) to let her/him know of your mission for subsequent reimbursement. (GDR QCD people please see contacts below.) All lunches and the dinner on Tuesday evening (restaurant Caffè Forté) are paid for centrally, so should not be considered in your mission costs.

If you like to give a talk, please submit title and abstract here on the Indico page before March 6th. For any questions regarding the corresponding session, please contact the group conveners:

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

Contacts for the GDR QCD: Emilien Chapon, Jean-Philippe Lansberg, Laure Marie Massacrier

More information at terascale.in2p3.fr

 

DinnerLocation_Caffe_Forte.png

lun. 24 avril

12:00 → 14:00 Lunch

14:00 → 14:15 Welcome

welcome-hires.pdf

welcome-lowres.pdf

14:15 → 15:45 Dark Universe

14:15 First results from the LUX-ZEPLIN (LZ) dark matter experiment.

LUX-ZEPLIN (LZ) is a direct dark matter detection experiment currently operating at the Sanford Underground Research Facility (SURF) in Lead, South Dakota. It uses the world’s largest dual-phase xenon time projection chamber, with 7 tonnes of active xenon, primarily to look for dark matter in the form of Weakly Interacting Massive Particles (WIMPs). LZ has released its first WIMP search results last year with an exposure of 60 live days using a fiducial mass of 5.5 tonnes. These results set new limits on spin-independent and spin-dependent WIMP-nucleon cross-sections for WIMP masses above 9 GeV/c$^2$. This talk will provide an overview of the LZ project and the efforts that enabled LZ to achieve this world-leading WIMP search result.

Orateur: Dr Amy Cottle (University of Oxford - Department of Physics)

Cottle_IRN_Terascale.pdf

14:45 First WIMP Search Results from the XENONnT Experiment

A rich number of astrophysical and cosmological observations indicate the existence of a massive, non-luminous and non-baryonic matter component which is commonly referred to as dark matter (DM). One well motivated class of DM are weakly interacting massive particles (WIMPs) which arise naturally from several beyond-Standard-model theories.
The XENON dark matter project aims for the direct detection of WIMPs utilizing the concept of a dual-phase time projection chamber (TPC), currently operating the 4th generation of XENON experiment, XENONnT, at the INFN Laboratori Nazionali del Gran Sasso underground laboratory. XENONnT was designed as a fast upgrade of its predecessor XENON1T, augmented by many new subsystems -- among them the world's first water Cherenkov neutron veto. The XENONnT TPC features a sensitive liquid xenon mass of 5.9 t and an unprecedented low background of intrinsic 85Kr and 222Rn, leading to an electronic recoil background rate of ⁠⁠⁠⁠⁠⁠(15.8±1.3)\,events/(t⋅y⋅keV) in the region of interest.
In this seminar we will report on the first WIMP search results with the XENONnT experiment, conducted in a blind analysis in an energy range between 3.1 keV and 60.0 keV, and an exposure of approximately 1.1 tonne-year.

Orateur: Dr Julien Masbou (SUBATECH)

2023_04_24_Terascale_XENONnT.pdf

15:15 Directional detection of WIMPs with MIMAC

Directional detection is the only admitted strategy for the unambiguous identification of galactic Dark Matter (DM) even in the presence of an irreducible background. The directional detection strategy relies on the simultaneous measurements of the energy and the direction of a DM-induced nuclear recoil, and on the correlation of the recoil direction with the expected incoming WIMPs direction. Recoil energies must be searched in the keV-range: a WIMP typically transfers at maximum an energy lower than 10 keV/nucleon. The measurement of the directions of such low-energy nuclear recoils is challenging and, until the presented work, no directional detectors had achieved it.

In this talk, we present the low-energy performance of MIMAC, a directional detector based on Micromegas, demonstrating directionality down to a few keV. At low energy, the detector must operate at high gain (above 10^4). In these conditions, the interplay in signal formation between the electronic and the ionic signals distorts the 3D track reconstruction while it improves the detector sensitivity. We develop an improved procedure to reconstruct the direction of a nuclear recoil with MIMAC by handling the track distortions at high gain. We then determine the directional performance of the detector by means of mono-energetic neutron fields at 27 keV and 8 keV in order to measure the scattering angle of neutron-proton interactions. The reconstruction of the neutron energy spectra, which depends on the scattering angle, with a better than 15° angular resolution in the keV-range, achieves the target requirements for the directional strategy of detection.

A bi-chamber module of MIMAC is currently running at the Underground Laboratory of Modane (LSM) using a 10x10 cm2 Micromegas made of low-radioactivity materials. In the meantime, the collaboration is testing a 35x35 cm2 Micromegas, aiming for an installation of such a larger detector at the LSM in 2023. This will be the elementary brick for the m3 MIMAC detector.

More details can be found at: https://arxiv.org/abs/2112.12469

Orateur: Cyprien Beaufort (CNRS/LPSC)

Terascale2023_MIMAC_Beaufort.pdf

15:45 → 16:15 coffee & tea break

16:15 → 17:30 Dark Universe

16:15 Cosmic antiparticles : is there room for dark matter?

TBA

Orateur: Yoann GÉNOLINI (LAPTh, Annecy)

Presentation_IRN.pdf

16:45 Gravitational portals during reheating

Inflation is now very well motivated because it can solve many issues of the Big Bang scenario. Specific models of inflation can be tested by observations, most notably by the CMB anisotropy power spectrum. I will present results on (dark) matter production in the late time evolution of this inflationary field usually called "reheating", and the challenges to probe these mechanisms. Especially I will present what we call gravitational portals, as a minimal scenario to produce perturbatively particles during this phase of the early Universe.

Orateur: Simon Cléry (IJCLab - Pôle théorie)

Terascale_Simon_CLERY.pdf

17:30 → 18:30 Scientific management committee: meeting

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

IRN SMC meeting Apr2023.pdf

mar. 25 avril

09:00 → 10:30 Higgs

09:00 Test of CP-invariance of the Higgs boson in VBF production and 4 lepton decays in ATLAS

Orateurs: Arthur Schaffer (IJCLab), R.D. Schaffer (lal)

rds-terascale-230425.pdf

09:20 Study of top-Higgs CP properties with ttH and tH events with H→bb decays in ATLAS

Orateur: Dr Timothée Theveneaux-Pelzer (CPPM)

INRTerascale_2023-04-25.pdf

09:40 The general THDM in gauge-invariant form

In the general Two-Higgs Doublet Model it has been shown that the Higgs potential can be expressed in terms of gauge-independent quantities. In particular, stability, electroweak symmetry breaking, and CP symmetry can be understood in a concise way, avoiding unphysical gauge degrees of freedom. In a recent work, arXiv:2208.13179, we have completed this program showing how all the masses, the trilinear and quartic scalar interactions, the gauge-boson-Higgs interactions, as well as the Yukawa couplings in the general THDM can be expressed in a gauge-invariant form.

Orateur: Ingo Schienbein (LPSC)

THDM_schienbein.pdf

10:00 Search for low mass resonance in diphotons with CMS

Orateurs: Suzanne GASCON-SHOTKIN (IPN Lyon), Suzanne GASCON-SHOTKIN (IPN Lyon/Universite Claude Bernard Lyon 1)

SuzanneGasconCMSLow-massResonanceSearchesCMS_IRNTerascaleGrenoble2023.pdf

SuzanneGasconCMSLow-massResonanceSearchesCMS_IRNTerascaleGrenoble2023.pptx

10:30 → 11:00 coffee & tea break

11:00 → 12:30 Higgs

11:00 Quantum information in Higgs to tau tau at future lepton colliders

We introduce a methodology and investigate the feasibility of measuring quantum properties of tau lepton pairs in the $H \to \tau^+ \tau^-$ decay at future lepton colliders.
In particular, observation of entanglement, steerability and violation of Bell inequalities are examined for the ILC and FCC-ee.

Orateur: Mohammad Mahdi Altakach

IRN-23-Altakach.pdf

11:20 Exploring extended Higgs sectors via pair production at the LHC

Orateur: Giacomo Cacciapaglia (IP2I Lyon)

Cacciapaglia_IRNtera.pdf

11:40 Differential cross-section measurement in H->ZZ with CMS

Orateur: Alessandro Tarabini

Tarabini_IRNTerascale.pdf

12:00 Study of h(125) off-shell couplings in 4l and llnunu channels with ATLAS

Orateur: Arnaud Maury ({UNIV PARIS-SACLAY}UMR9012)

Off-shell HZZ (Terascale)_maury.pdf

12:30 → 14:00 Lunch

14:00 → 15:40 Beyond the Standard Model

14:00 Precision predictions for exotic lepton production at the Large Hadron Collider

We calculate total and differential cross sections for the pair production, at the Large Hadron Collider, of exotic leptons that could emerge from models with vector-like leptons and in Type-III seesaw scenarios. Our predictions include next-to-leading-order QCD corrections, and we subsequently match them with either parton showers, or threshold resummation at the next-to-next-to-leading logarithmic accuracy. Our results show an important increase of the cross sections relative to the leading-order predictions, exhibit a distortion of the shapes for various differential distributions, and feature a significant reduction of the scale uncertainties. Our predictions have been obtained from new FeynRules model implementations and associated UFO model libraries. This completes the set of next-to-leading-order implementations of new physics models featuring extra leptons that are publicly available on the FeynRules model database.

Orateur: Yehudi Simon (LPTHE - Sorbonne Université)

Precision predictions for exotic lepton production at the Large Hadron Collider

ResummationVLL_IRN.pdf

14:20 Functional one-loop matching of effective field theories

The separation of scales in effective field theories is essential for studying the low-energy phenomenology of BSM models. An effective theory, containing only light degrees of freedom, can be obtained from an underlying UV theory by integrating out heavy states using path integral techniques, ensuring that both theories describe the same low-energy dynamics. It is important to perform this matching beyond the leading order, as a great number of observables, like FCNC, only appear at the loop level. In this talk we discuss the functional matching procedure and highlight some of the technical challenges arising from operator reduction and evanescent operators in the EFT Lagrangian. We also present Matchete: a Mathematica code for the automatic one-loop matching of effective theories based on functional methods.

Orateur: Felix Wilsch (University of Zurich)

grenoble-matchete.pdf

14:40 Towards a combined global SMEFT fit: Using likelihood analyses in the Top and Higgs sector

We present an updated global SMEFT analysis in the Top sector using the SFitter framework which focuses on a comprehensive treatment of uncertainties. We make use of a newly implemented marginalization procedure which allows for comparisons between profiling and marginalization methods. In addition, two top measurements included in the fit are updated using likelihoods made publicly available by the Top working group at ATLAS. This enables us to extract uncertainties more easily and to use a much more flexible treatment of the different nuisance parameters. Finally, we present some preliminary results for a combined global fit of this Top analysis with a previous analysis in the Higgs and Electroweak sector.

Orateur: Nikita Schmal (ITP, Heidelberg University)

Schmal_IRN_2023.pdf

15:00 Higgs Couplings to Weak Gauge Bosons: Probing 2 New Physics Scales at Once!

Measuring the Higgs boson couplings with an increasing precision is an indirect probe of new physics scenarios. In this talk, I will discuss how observing loop-induced deviations to hWW and hZZ couplings via new vectorlike leptons close to the weak scale can be used to deduce an upper bound on the mass scale of new bosons. This is an interesting example where observing a deviation to the Standard Model predictions allows probing new physics at a scale higher than the new mass scale that is responsible for the anomaly.

Orateur: Florian Nortier (IPhT (CEA Paris-Saclay))

Nortier_Terascale.pdf

Slides on Zenodo

15:20 Muon(ium) g-2

Orateur: Cedric Delaunay (LAPTH)

Delaunay@Terascale2023.pdf

15:40 → 16:10 coffee & tea break

16:10 → 17:30 Beyond the Standard Model

16:10 On axion couplings and anomalies

The axion couplings and their relation to quantum anomalies are discussed.
I comment on a puzzling non-decoupling effect and its consequences.

Orateur: Emilian Dudas (CPHT, Ecole Polytechnique)

axions-anomalies-IRN.pdf

16:30 The Universal One-Loop Effective Action with Gravity

Orateur: Rémy Larue (LPSC)

Terascale.pdf

16:50 New perspectives in Gravity Mediated SUSY Breaking: New contributions to the Higgs sector

I will present a model related to a new class of solutions in gravity-mediated supersymmetry breaking. This class of solutions involves a new sector which may help to reduce the fine tuning of the Higgs boson mass. New supersymmetry breaking terms are generated corresponding to soft breaking terms and new hard breaking terms that are Planck-suppressed but may be sizable and contribute to the Higgs boson mass. Since these models involve singlets, they are naturally related to singlet-extensions of the MSSM, such as the NMSSM. We construct a two-singlet extension of the MSSM, called S2MSSM, assuming this new class of solutions. The order of magnitude of the one-loop contribution to the Higgs boson mass is studied. The new tree-level structure is also investigated.

Orateur: Robin Ducrocq (IPHC)

Ducrocq_IRN_2023.pdf

17:10 Physics at the High Energy Muon Collider

In this talk I will review the physics case of a high energy muon collider for the exploration of new physics with particular focus on Higgs boson physics, top quark physics and dark matter. I will discuss the role of a high energy muon collider in the landscape of future experiment to probe new physics in the next decades.

Orateur: Roberto Franceschini (CERN)

Physics at the High Energy Muon Collider Short.pdf

19:30 → 22:00 Workshop Dinner

caffe_forte_map_tram.png

directions (Google maps)

mer. 26 avril

09:30 → 10:45 Methods and Tools

09:30 SUSPECT3

Presentation of the new vesrion of SUSPECT3 (v3.1.1) described in "SuSpect3: A C++ Code for the Supersymmetric and Higgs Particle Spectrum of the MSSM"

Orateur: Dirk Zerwas (IJCLab and DMLab)

230426_Grenoble.pdf

09:55 New developments in SModelS

I will present recent developments in SModelS, in particular the update of the database with the latest available experimental results for full Run-2 luminosity, the interface to the new statistical package Spey, and the statistical combination of analyses. The latter allows one to increase the robustness of the statistically inferred constraints. To demonstrate the physics impact, I will use the electroweakino sector of the MSSM as an illustrative example.

Orateur: Timothee Pascal

new_developments_in_smodels.pdf

10:20 Simplified likelihoods using linearized systematic uncertainties

The ability to reuse published experimental results -- for instance reinterpretations in the context of alternative models, or combinations of multiple results -- is crucial to searches for new phenomena in high energy physics. The information that is made public, typically best-fit values, uncertainties and covariance matrices, is often insufficient to fully carry out this program, in particular in the presence of non-Gaussian effects from low event counts or correlated systematic uncertainties.

Simplified likelihoods provide an intermediate solution between this situation and the use of full likelihoods, which is often complex and computing-intensive. This talk presents a new such format, Simplified Likelihoods with Linearized Systematics (SLLS), which is complementary to other formats in current use. It preserves the Poisson nature of event-counting measurements and all the sources of systematic uncertainties of the full likelihood, which permit an accurate treatment of low event counts and correlated systematic effects. Systematic uncertainties are treated in the linear approximation, which leads to large gains in likelihood minimization performance, compared to full likelihoods.

Related publication: https://arxiv.org/abs/2301.05676

Orateur: Nicolas Berger (LAPP)

SLLS-TeraScale.pdf

10:45 → 11:15 coffee & tea break

11:15 → 12:30 Methods and Tools

11:15 NFLikelihood: Unsupervised Machine Learning LHC likelihoods with Normalizing Flows.

Full statistical models encapsulate the complete information of an experimental result, including the likelihood function given observed data. Their proper publication is of vital importance for a long lasting legacy of the LHC. Major steps have been taken towards this goal; a notable example being ATLAS release of statistical models with the pyhf framework. However, even the likelihoods are often high-dimensional complex functions that are not straightforward to parametrize. Thus, we propose to describe them with Normalizing Flows, a modern type of generative networks that explicitly learn the probability density distribution. As a proof of concept we focused on two likelihoods from global fits to SM observables and a likelihood of a NP-like search, obtaining great results for all of them.

Orateur: Humberto Reyes-González (University of Genoa)

NFlikelihoods.pdf

11:40 Can we trust machine learning? Parton distributions as a case study

I discussed some issues that arise when using Machine Learning as an inference tool in the particular context of the determination of parton distributions. Problems I address include: how do we know that the ML model generalizes correctly? Can we detect overlearning? Can we assign an uncertainty to the ML model predictions, and can we validate this assignment?

Orateur: Stefano Forte (Dipartimento di Fisica, Università di Milano)

teraml.pdf

12:05 Round table

12:30 → 13:45 Lunch

13:45 → 15:50 Joint session with GDR QCD (WG3)

13:45 MadGraph and NLO Access

Orateur: Dr Carlo FLORE (IJCLab Orsay)

talk-MG5-NLOAccess-26-04-2023.pdf

14:10 QCD corrections for precision measurements of W/Z at the LHC using POWHEG

Orateur: Emanuele Re

2023_04_26.pdf

14:35 Combined EW+PDF fits

Orateur: Juan Salvador TAFOYA VARGAS (ATLAS - IJCLab / Université Paris-Saclay)

combined_ew_PDF_fit___IRN_Terascale___Grenoble.pdf

15:00 TMD/PDF extraction for precision W/Z measurements at the LHC

Orateur: Valerio Bertone (IRFU, CEA, Université Paris-Saclay)

bertone_IRNTerascale_2023_26_04_2023.pdf

15:25 Round table -cont-

15:50 → 16:00 Farewell (famous last words...)

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

lastwords_Grenoble.pdf