Bound states in strongly coupled systems

Session

BSM and QCD

Mar 14, 2018, 9:30 AM

GGI

15. Bound states and Interquark Potential in High Temperature Lattice Gauge Theories

Michele Caselle (TO)

3/14/18, 9:30 AM

Conformal perturbation is a powerful tool to describe the behaviour of statistical mechanics models and quantum field theories in the vicinity of a critical point. It was widely used in the past to describe two dimensional models and has been recently extended, thanks to the remarkable results of the bootstrap approach, also to three dimensional models. We show here that it can be also used...

13. Present and future hadron spectroscopy at JLab

Marco Battaglieri (GE)

3/14/18, 10:00 AM

The distinctive property of confinement in strong interactions, which are described by QCD, prevents quarks and gluons from appearing as free particles. Hadron spectroscopy represents a powerful tool to investigate the nature of the strong interactions. Beside the traditional use of hadron probe (pion, kaons, proton and anti-proton) and e+e0- colliders, a new generation of electron- and...

38. Large scale separation from mass-split BSM models

Prof. Anna Hasenfratz (University of Colorado)

3/14/18, 10:30 AM

Beyond Standard Model theories describing the electro-weak sector with a 125 GeV Higgs boson but with so far no other observed resonances must be consistent with large scale separation or “walking". Large separation of scales arises naturally and in a tunable manner in mass-split models that are built on a conformal fixed point in the ultraviolet. When the fermion masses are split, with...

33. Numerical exploration of a mass-split model with four light and eight heavy flavors

Oliver Witzel (University of Colorado Boulder)

3/14/18, 11:30 AM

Using the specific example of four light and eight heavy flavors we explore mass-split models using fully dynamical numerical simulations. We present results for the meson spectrum showing states made up of only light or only heavy flavors in order to verify theoretical expectations. With results obtained at two values of the bare gauge coupling, five different values for the mass of...

41. QCD screening masses in external fields

Massimo D'Elia (PI)

3/14/18, 12:00 PM

We discuss recent lattice results concerning the influence of external backgrounds, such as magnetic fields and chemical potentials, on the confining and screening properties of the QCD thermal medium.

32. S-matrix bootstrap revisited

Joao Penedones (EPFL)

3/14/18, 12:30 PM

Inspired by the recent success of the numerical approach to the conformal bootstrap, we revisit the S-matrix bootstrap program. We shall explain how to obtain analytic bounds on the interaction strength in 1+1 QFT. In higher dimensions, we propose a numerical algorithm that seems to converge to optimal bounds.

17. Nonperturbative applications of the functional renormalization group

Dr Luca Zambelli (TPI, Friedrich-Schiller-Universität Jena)

3/14/18, 2:30 PM

The functional renormalization group is a nonperturbative semi-analytic tool for continuum computations in quantum field theory and high energy theory, and I will present some illustrative examples of its modern applications. It has been quite successful in describing chiral symmetry breaking and quantum criticality in three dimensional fermionic systems, as I will briefly review with some...

43. Flavor hierarchies from dynamical scales

Giuliano Panico (IFAE (BArcelona))

3/14/18, 3:00 PM

One main obstacle for any BSM scenario solving the hierarchy problem is its potentially large contributions to electric dipole moments. An elegant way to avoid this problem is to have the light SM fermions couple to the BSM sector only through bilinears. This possibility can be neatly implemented in composite Higgs models by dynamically generating the fermion Yukawa couplings at different...

40. Dark Matter from new strong dynamics

Roberto Contino (PI)

3/14/18, 3:30 PM

The observed abundance of Dark Matter may be explained by particle candidates which are bound states of new strongly-interacting dynamics. Stability of such candidates can be the consequence of accidental symmetries as it happens for the proton in the Standard Model. I will consider theories with fermions in the adjoint representation of the dark gauge group and discuss their rich phenomenology.