LIO international conference on Future colliders and the origin of mass

21 juin 2021, 09:00 → 25 juin 2021, 17:00 Europe/Paris

web/Amphi Dirac (webcast and IP2I)

Aldo Deandrea (IPNL), Giacomo Cacciapaglia (IP2I Lyon)

The LIO international conference on "Future colliders and the origin of mass" aims at discussing the new recent results in particle physics and explore new and emerging models of physics beyond the standard model which can be relevant at present and future colliders. The phenomenology of these models and their implications for lepton flavour, Higgs physics, Dark matter and neutrino physics will be discussed in detail. We will also host a session dedicated to discussing the implications of the muon g-2 measurement.

The conference will be both a webcast event and a local event at IP2I. It is aimed at discussing and starting new collaborations and projects, so ample time will be left for discussion and collaborative work.

Zoom connection:

https://cnrs.zoom.us/j/93031725572

Meeting ID: 930 3172 5572
Passcode: 5bhdVG

How to reach Lyon: if you fly in the Lyon Exupery airport, you can easily reach Lyon by taking the express tram Rhonexpress to the central Lyon Part-Dieu train station.

How to reach the IP2I : take the tram T1 direction IUT Feyssine or T4 direction La Doua Gaston Berger and get off at the stop Universite Lyon 1. From there you can walk to the IP2I: follow the tram track and turn on the first road on the left. The IP2I is down the road (click on the link below to see a map). Address: 4 rue Fermi, Villeurbanne

View Map IP2I

 

Invited key speakers include:

- Aoife Bharucha 

- Alexander Belyaev

- Greg Bernardi

- Andreas Crivellin

- Hyun Min Lee

- Laurent Lellouch

- Pyungwon Ko

- Nazila Mahmoudi

- Bogdan Malescu

- Michelangelo Mangano

- Yasuhiro Okada

- Francesco Sannino

 

Scientific committee : G. Cacciapaglia (IP2I), A. Deandrea (IP2I), Benjamin Fuks (LPTHE, Sorbonne Univ.), Suzanne Gascon (IP2I)

 

 

lundi 21 juin

1 Prospects for the ILC project

The International Linear Collider (ILC) is the highest-energy electron-positron collider proposed by the international high-energy physics community. It is planned to start as a Higgs Factory with center-of–mass energy of 250 GeV, keeping energy extendibility at a later stage. Preparation for the ILC has entered a new stage recently with publication of “Proposal for the ILC Preparation Laboratory (Pre-lab)” by the ILC International Development Team. I will introduce the outline of the ILC and physics at the ILC, and explain current efforts and future prospects to realize the ILC as an international project.

Orateur: Yasuhiro Okada (KEK)

LIO-okada-20210621.pdf

2 Physics prospects of the Future Circular Collider

Orateur: michelangelo mangano (CERN)

Mangano_Lyon.pdf

3 Terazooming into compositeness/ALP's

The Tera-Z phase of future e+e− colliders, FCC-ee and CepC, is a goldmine for exploring Z portal physics. We focus on axion-like particles (ALPs) that can be produced via Z decays with a monochromatic photon. As a template model, we consider composite Higgs models with a light pseudo-scalar that couples through the Wess-Zumino-Witten term to the electroweak gauge bosons. For both photophilic and photophobic cases, we show that the Tera-Z can probe composite scales up to 100s of TeV, well beyond the capability of the LHC and current precision physics. Our results also apply to generic ALPs and, in particular, severely constrain models that explain the muon g−2 anomaly

Orateur: Dr ABHISHEK IYER (IP2I Lyon)

mardi 22 juin

4 New Physics prospects from D to pi l+l-

I will discuss the decay D to pi l+l-, providing motivation from the B physics anomalies. After having reviewed the previous status of the calculation for this decay, I will motivate our calculation where we take a new approach to the the resonance contributions and include for the first time the relatively large contributions from the weak annihilation diagrams. I will then discuss the consequences of this calculation of the search for new physics via D to pi l+l-, mentioning both the model independent case and the case of specific models.

Orateur: Aoife Bharucha (CPT, Marseille)

AoifeLIO.pdf

5 Searching for New Physics with semileptonic B decays

Orateur: Nazila Mahmoudi (Lyon University)

6 On the EFT description of ALPs coupled to heavy chiral matter

The impact of heavy new physics on low-energy observables is generically and conveniently described using effective field theories (EFTs). The latter framework, when applied to the degrees of freedom of the standard model (SM), raises several questions, for instance: which is the most general EFT? which UV models require that the most general EFT be used? which observables allow to test whether the most general EFT is necessary? In this talk, I will approach these questions using the SM extended with an axion-like particle (ALP) and heavy chiral fermions. In particular, I will explain why non-decoupling effects forbid the description within the SMEFT of the interaction between the ALP and two SM gauge bosons. I will also compare the latter interaction with an adequate UV anomaly coefficient, which is also non-decouplin
g.

Orateur: Quentin Bonnefoy

Bonnefoy_Lyon.pdf

7 The neutrinoless beta beta process at the LHC and beyond

The Majorana nature of neutrinos and whether lepton number symmetry is conserved are among the most pressing mysteries in physics today. This follows from their widespread implications for cosmology, nuclear physics, and particle physics. Along these lines, searches for the neutrinoless beta beta (0vBB) decay mode of heavy nuclei are highly sensitive probes of these questions, albeit with important limitations. In this talk we present a new look into the high-energy realization of the 0vBB process at the Large Hadron Collider (LHC). As a case study, we focus on the same-sign WW scattering process to same-sign muons, which violates lepton number and is outside the reach of nuclear decay experiments. Whether mediated by heavy Majorana neutrinos or more generally by the Weinberg operator, we find that the LHC offers incredible complementarity to lower energy experiments and further extends the sensitivity to the nature of neutrinos.

Orateur: Richard Ruiz (Institute of Nuclear Physics (IFJ) PAN)

rruiz_LIO2021_0vBB_LHC.pdf

mercredi 23 juin

g-2

8 Some thoughts on muon g-2 and B-meson anomalies

Orateur: Hyun Min Lee

LIO21-hmlee_v2.pdf

9 Naturalness, the deus-ex-machina of the muon g-2 anomaly and lepton non-universality.

I will critically present the state-of-the-art of the observed standard model anomalies in flavor physics and in muon g-2 experiment. I will discuss whether the standard model could still be rescued both theoretically and experimentally and whether the anomalies can be considered as serious hints of new physics and what type. In particular I will make the case that the anomalies, especially the g-2 one hint to revived natural models of beyond standard model physics. Looking ahead, I will present possible scenarios of discovery of new physics at colliders and beyond.

Orateur: Francesco Sannino (CP3)

g-2

10 New Physics Models

Orateur: Andreas Crivellin (CERN)

Lyon2021 (1).pdf

jeudi 24 juin

11 physics and challenges at FCC-ee

Orateur: Gregorio Bernardi (APC & LPNHE Paris)

FCC-ee-challenges-lyon-bernardi.pdf

12 A new resolution of flavor problem in 2HDM with U(1) Higgs gauge symmetry

Generic 2HDM's suffer from neutral Higgs mediated FCNC problem. Traditionally this problem is avoided by softly broken Z2 symmetry that distinguishes H1 and H2. In this talk I implement the softly broken Z2 symmetry to spontanesouly broken U(1) Higgs gauge symmetry. In this setup one often has to add new chiral fermions in order to maintain gauge anomaly cancellation. I discuss extensions of Type I, II, X, Y, and discuss some phenomenology.

Orateur: Pyungwon Ko (KIAS)

13 Towards the Consistent Dark Matter exploration

The nature of Dark Matter (DM) is one of the greatest puzzles of modern
particle physics and cosmology. Although overwhelming observational
evidences from galactic to cosmological scales point to the existence of
DM, after decades of experimental effort only its gravitational
interaction has been experimentally confirmed. Currently, we do not have
any clue on DM properties, such as its spin, mass, interactions other
than gravitational, symmetry responsible for its stability, number of
states associated to it, and possible particles that would mediate the
interactions between DM and the standard model (SM) particles.

If DM is light enough and interacts with SM particles directly or via
some mediators with a strength beyond the gravitational one, its elusive
nature can be decoded or constrained though combined searches: a) from
direct production at colliders b) via the relic density precisely
measured through the observations of cosmic microwave background (CMB)
anisotropies by WMAP and PLANCK collaborations; c) from DM direct
detection (DD) experiments, which are sensitive to elastic spin
independent (SI) or spin dependent (SD) DM scattering off nuclei; d)
from DM indirect detection searches, that look for SM particles produced
in the decay or annihilation of DM present in the cosmos, both with high
energies observables (gamma-rays, neutrinos, charge cosmic rays)
produced in the local Universe, and by studying the effects of energy
produced by DM annihilation in the early universe on the properties of
the CMB spectrum.

Decoding of unknown underlying theory of DM requires systematic
approach.Therefore we suggest the classification of Dark Matter models
with mediator multiplets of different spins charged under the weak
group. This classification allows to identify models which are already
excluded and those models and signatures which can be tested and
possibly discovered at the LHC, future colliders and non-colldier
experiments. Systematic exploration of DM models and their signatures
at present creates the ground for the discovery of DM and its
identification in the near future.
Several classes of those models are discussed.

Orateur: Alexander Belyaev (Southampton University)

LIO2021_consistent-dm_Belyaev.pdf

vendredi 25 juin

g-2

14 On the dispersive evaluation of the HVP contribution to a_mu and alphaQED, and implications for the EW fit

Orateur: Bogdan MALAESCU (LPNHE, Paris, FRANCE)

DispersiveHVP_amu_alphaQED_EWfit__Malaescu.pdf

15 Leading hadronic contribution to the muon magnetic moment from lattice quantum chromodynamics

Orateur: Laurent Lellouch (CPT Marseille)