CoDyCE - LIO international workshop on Fundamental Theories for BSM and cosmology

28 août 2018, 08:30 → 31 août 2018, 18:30 Europe/Paris

Salle Fontannes (Lyon)

Stefania De Curtis (INFN Firenze), Aldo Deandrea (IPNL), Giacomo Cacciapaglia (IPNL - Univ. Lyon 1)

The CoDyCE international workshop aims at discussing the new results from the Large Hadron Collider and explore new and emerging models of physics beyond the standard model. It will be mainly dedicated to different aspects of fundamental theories beyond the Standard Model, including asymptotically safe extensions, fundamental composite Higgs models, QCD and lattice techniques applied to electroweak physics, relation to dark matter particle candidates. The phenomenology of light composite scalars will also be discussed.

The workshop is aimed at starting new collaborations and projects, so ample time will be left for discussion and collaborative work.

We shall set up working groups and discussions on the following tentative topics:

Asymptotic safe extensions of the Standard Model

Baryogenesis

Naturalness, what next?

Dark matter

Fundamental composite dynamics and lattice calculations

Safe gravity and cosmology

 

This year the venue will be the salle Fontannes, in the Building Darwin. The building is in front of the tram T1/T4 stop "Université Lyon 1" (see map below).

View Map salle Fontannes

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 IPNL : 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 IPN: follow the tram track and turn on the first road on the left. The IPNL is down the road (click on the link below to see a map). Address: 4 rue Fermi, Villeurbanne

View Map IPNL

 

 

 

 

 

Federations.pdf

Marguerite.pdf

mardi 28 août

09:00 Registration

1 Fundamental Interactions, The Next Revolutions

Orateur: Francesco Sannino

10:45 Coffee break

2 Duality along the RG flow

I will show an example of exact duality along the RG flow between the electric and magnetic versions of SQCD in D=4. In the vicinity of Nf=3Nc/2 the non-perturbative electric flow can be calculated in terms of the perturbative electric one.

Orateur: Borut Bajc

bajc-lyon18.pdf

3 How to naturally break electroweak symmetry

Orateur: Teng Ma

13:00 Lunch (Cantine Domus)

4 Effective actions and the Conformal Scale for physics BSM

Orateur: Claudio Coriano

5 Confronting (composite) DM models and MOND with rotation curves and astrophysical observations

Orateur: Mads Frandsen

16:30 Coffee break

17:00 Discussion and working group set up

mercredi 29 août

6 Central charges and their constraints

I will introduce the idea of central charges and how they can imply constraints on UV/IR asymptotics of RG flows akin to 't Hooft anomalies. I will review some results on their monotonicity properties and the so-called a-theorem stating that the central charge 'a' decreases along the RG flow. I will then show how can central charges be computed in realistic theories and present examples. These examples will include both asymptotically safe and asymptotically free theories. Finally I will discuss the relation between central charges and certain convergent sum rules, which can provide a way of putting the a-theorem on lattice.

Orateur: Vladimir Prochazka

Lyon2018(2).pdf

7 RG functions in semi-simple gauge theories at large Nf

Orateur: Nicola Dondi

11:45 Coffee break

12:00 Discussion

13:00 Lunch: Cantine Domus

8 Forging a link between quantum gravity and (beyond) Standard Model physics

Renormalization Group flows provide a link between Planck- and electroweak-scale physics, that could allow to test implications of quantum gravity at accessible energy scales [1]. Systematic truncations suggest the existence of a regime of asymptotically safe quantum gravity, in which gravity fluctuations induce a UV-completion of the matter sector. Within this scenario, the paradigm of asymptotic safety surpasses the predictive power of the Standard Model. It could retrodict the top mass, the bottom mass and the Abelian gauge coupling from first principles in a microscopic model including quantum gravity [2,3]. In our approximation, quantitative agreement with observations is only possible if the electric charge ratio of bottom and top lies in close vicinity to the Standard-Model value of Qb/Qt=-1/2. More generally, the asymptotic safety paradigm could give guidance for model building beyond the Standard Model. For instance, it places novel constraints on grand unification [4] and dark matter searches [5]. References: [1] A. Eichhorn and A. Held, Phys. Rev. D 96, no. 8, 086025 (2017). [2] A. Eichhorn and A. Held, Phys. Lett. B 777, 217 (2018). [3] A. Eichhorn and A. Held, arXiv:1803.04027 (2018). [4] A. Eichhorn, A. Held and C. Wetterich, arXiv:1711.02949 (2017). [5] A. Eichhorn, A. Held and P. Vander Griend, arXiv:1802.08589 (2018)

Orateur: Aaron Held

9 The flavor puzzle and the Goldstone-Higgs

We propose a unified model of scalar particles that addresses the flavour hierarchies, solves the strong CP problem, delivers a dark matter candidate,
and provides the trigger for electroweak symmetry breaking. Besides furnishing a unification of the recently proposed axiflavon with a Goldstone-Higgs sector, the scenario can also be seen as adding a model of flavour (and strong CP conservation along with axion dark matter) to elementary Goldstone-Higgs setups.

Orateur: Simone Blasi

Talk_template.pdf

16:00 Coffee break

16:30 Discussion and Working Groups

20:00 Diner au restaurant Marguerite

jeudi 30 août

10 Dark Bound States of Vector-like fermions

I will discuss the possibility that dark matter in the universe is composed of bound states of fermions with vector-like masses. Those particles are well motivated theoretically in allow in particular to realise asymptotically safe extensions of the Standard Model. I will show that those fermions can form bound states due to a new gauge group, which confines above the temperature of the QCD phase transition or in the most economical set-up the confinement can be due to Standard model strong interactions. Thus leading to weakly intreating massive particles made of strongly interacting components.

Orateur: Juri Smirnov

DM Bound States Lyon.pdf

11 Probing Baryogenesis through the Higgs Self-Coupling

The link between a modified Higgs self-coupling and the strong first-order phase transition necessary for baryogenesis is well explored for polynomial extensions of the Higgs potential. We broaden this argument beyond leading polynomial expansions of the Higgs potential to higher-order polynomial terms and to non-polynomial Higgs potentials with the use of the functional renormalization group. In all cases we find that a strong first-order phase transition manifests itself in an enhancement of the Higgs self-coupling by at least 50%, implying that such modified Higgs potentials should be accessible at the LHC. The modifications of the Higgs potential can be linked to e.g. asymptotically safe extensions of the Standard Model.

Orateur: Manuel Reichert

11:30 Coffee break

11:50 Discussion

13:00 Lunch: Cantine Domus

12 An almost elementary Higgs: theory and practice

Orateur: Daniele Barducci

barducci_CoDyCE_2.pdf

13 Flavor Physics and Flavor Anomalies in Minimal Fundamental Partial Compositeness

I would like to present the paper of the same name, written in collaboration with F. Sannino, P. Stangl, and D. Straub. I will breifly review the Fundamental Partial Compositeness framework which is a realistic model for composite dynamics. I then present our analysis of the falvor physics in the minimal model. In particular the analysis finds parameter points that pass the current precision tests. At the same time the new physics contribution to the flavor physics is found to be testable at both current and future experiments. I will pay particular attention the hints of lepton flavor violation in the R_{K^{(\ast)}} and R_{D^{(\ast)}} observables.

Orateur: Anders Thomsen

16:00 Coffee break

16:30 Working Groups

20:00 Diner au Café des Fédérations

vendredi 31 août

14 Large mass hierarchies in strongly coupled theories with multi-scale dynamics

Strongly coupled theories exhibiting walking dynamics provide a scenario for beyond the Standard Model physics, in which electro-weak symmetry is broken dynamically and the large hierarchy between the electro-weak and Planck energy scales is naturally generated. Due to the spontaneous breaking of approximate scale invariance, a light dilaton can be expected to be present in the spectrum. In this talk, we present an example of a strongly coupled theory with multi-scale dynamics, in which there is a light composite scalar state. Using gauge-gravity duality, we compute the spectrum of scalar and tensor glueballs by studying an 8-scalar sigma-model in five dimensions, the solutions of which include the one-parameter family of backgrounds dual to the baryonic branch of the Klebanov-Strassler field theory. We argue that far out on the moduli space, the ratio of explicit to spontaneous breaking of scale invariance can be made small, leading one of the scalar states, the pseudo-dilaton, to become parametrically light.

Orateur: Daniel Elander

Lyon2018.pdf

15 Unearthing the electroweak structure of warped extra-dimensions at colliders

Orateur: Abhishek Iyer

11:30 coffee break

16 Probing the nature of Dark Matter at the ILC

We analyse the potential of the proposed international linear collider to detect Dark Matter (DM) and determine its properties. In many models stability of Dark Matter particles D is ensured by conservation of a new quantum number referred to as D-parity. Our models also contain charged D-odd particles $D^{\pm}$ with the same spin as D. In this work, we study two minimal consistent models corresponding to scalar and fermionic DM. The first of which is the inert higgs doublet model (I2HDM), which is a $Z_2$ symmetric Two Higgs Doublet Model, with the lightest neutral scalar being identified as D. The latter contains an SU(2) doublet of vector-like Dirac fermions, and an additional neutral singlet fermion. In this model, D is a mixture of neutral fermion singlet and doublet. For minimal fermionic DM, we perform an analysis of constraints of the parameter space, coming from DM relic density, DM direct detection, and collider. We propose a method to determine the mass of DM and distinguish its spin, in the process $e^+e^- \to D^+D^- \to DDW^+W^-\ to DD (q\bar{q})(\ell\nu)$ with a signature dijet + $\mu$ (or $e$) + missing mass.

Orateur: Daniel Locke

Discussion

13:00 Lunch Cantine Domus

Working groups