Excited QCD 2016

Session

Friday Morning

11 Mar 2016, 08:20

Costa da Caparica, Portugal

Conveners

Friday Morning

• John Merritt Bulava

111. Status and perspectives of the search for eta-mesic nuclei

Pawel Moskal (Jagiellonian University)

11/03/2016, 08:30

The negatively charged pions and kaons can be trapped in the Coulomb potential of atomic nucleus forming so called mesonic atoms. Observations of such atoms allows for studies of strong interaction of pions and kaons with atomic nuclei on the basis of shifts and widths of the energy levels. It is also conceivable that a neutral meson could be bound to a nucleus. In this case the binding is...

76. Unitary multi-channel $\pi \pi$ scattering amplitudes of $f_2$ and $\rho_3$ mesons

Vahabeddin Nazari (Institute of Nuclear Physics, Polish Academy of Sciences)

11/03/2016, 09:00

In a unitary multi-channel approach, precise determination of $\pi \pi$ scattering amplitudes for $D$ and $F$ waves has been presented. These scattering amplitudes are in the $I^{G}J^{PC}$ = $0^{+}2^{++}$ sector on the processes of $\pi\pi$ $\rightarrow$ $\pi\pi$, $4\pi$, $K \bar K$ and $\eta\eta$, likewise in the $I^{G}J^{PC}$ = $1^{+}3^{--}$ sector on the processes of $\pi\pi$...

51. Large-N pion scattering,finite-temperature efects and the relationship of the f0(500) with chiral symmetry restoration

Santiago Cortes (Universidad de los Andes)

11/03/2016, 09:30

We study how the thermal properties of the f0(500) pole behave in a regime where temperature is below its critical chiral transition value. We attain this by considering an O(N +1)/O(N) invariant Non-Linear Sigma Model (NLSM) for a large number of N massless pions as an approach for the dynamics of Low Energy QCD, and after introducing a thermal bath via the imaginary time formalism. At T...

99. Flavoured aspects of the QCD thermodynamics

Olaf Kaczmarek (University of Bielefeld)

11/03/2016, 10:30

We discuss recent progress in lattice QCD studies on various aspects involving strange and heavy quarks. Appropriate combinations of conserved net strange and net charm fluctuations and their correlations with other conserved charges provide evidence that in the hadronic phase so far unobserved hadrons contribute to the thermodynamics and need to be included in hadron resonance gas...

108. Monte Carlo calculations on Lefschetz thimbles and beyond

Andrei Alexandru (The George Washington University)

11/03/2016, 11:00

A possible solution of the notorious sign problem for systems with non-zero chemical potential is to deform the integration region in the complex plane to a Lefschetz thimble. We introduce an easy to implement Monte Carlo algorithm to sample the dominant thimble, based on a contraction map on a thimble. We point out that manifolds other than Lefschetz thimble could be useful for numerical...

79. Complex Langevin in Lattice QCD: dynamic stabilisation and the phase diagram

Felipe Attanasio (Swansea University)

11/03/2016, 11:35

Complex Langevin simulations provide an alternative to sample path integrals with complex weights and therefore are suited to determine the phase diagram of QCD from first principles. We use our proposed method of Dynamic Stabilisation (DS) to ensure improved convergence to the right limit and present new systematic tests of this technique. We also show results on QCD in the limit of heavy...

110. Towards a precise and accurate non-perturbative determination of the strong coupling constant at the electroweak scale.

Alberto Ramos Martinez (CERN)

11/03/2016, 12:05

Relating the value of the strong coupling at the electroweak scale with the experimental value of hadronic quantities is a theoretical challenge that requires a non-perturbative formulation of the strong interactions. Lattice QCD provides an adequate theoretical framework to attack this problem. Our collaboration has developed a systematic strategy to connect non-perturbatively the low...