The 8th International Workshop on Chiral Dynamics 2015

Session

Poster Session

2 Jul 2015, 13:10

Building E, Polo Fibonacci (Pisa)

66. Chiral symmetry breaking and monopoles

Masayasu Hasegawa (Joint Institute for Nuclear Research, Moscow)

02/07/2015, 13:10

Goldstone Boson Working Group

Poster

In previous works we have shown the relation between chiral symmetry breaking, instantons, and monopoles by adding the monopoles to quenched SU(3) configurations [1,2]. We found that (i) one pair of monopoles makes one instanton. (ii) the monopole pair induces chiral symmetry breaking. This was done by measuring the chiral condensate computed from the eigenvalues and eigenvectors of the Overlap...

68. Glueball decay in the Witten-Sakai-Sugimoto model

Frederic Brünner (Vienna University of Technology)

02/07/2015, 13:10

Hadron Structure and Meson-Baryon Interaction Working Group

Poster

I present new results on glueball decay rates in the Sakai-Sugimoto model, a holographic top-down approach for QCD with chiral quarks based on a probe-brane construction within Witten’s holographic model of nonsupersymmetric Yang-Mills theory. We calculated [1] rates for decays into two pions, two vector mesons and four pions, using a range of the ’t Hooft coupling which closely reproduces the...

109. Hypernuclear decay of strangeness -2 hypernuclei

Jordi Maneu (University of Barcelona)

02/07/2015, 13:10

Few-Body Physics Working Group

Poster

Since the discovery in 1952 of the first strange fragment in emulsion chamber experiments, many efforts have been put in extending our knowledge of the nuclear chart, including the SU(3) sector. Worldwide, the study of the interactions among nucleons and hyperons has been a priority in the research plan of many experimental facilities. After more than sixty years of Λ-hypernuclear studies,...

1. Hyperon forward spin polarizability gamma0 in baryon chiral perturbation theory

Astrid Hiller Blin (IFIC, University of Valencia)

02/07/2015, 13:10

Hadron Structure and Meson-Baryon Interaction Working Group

Poster

We present the calculation of the hyperon forward spin polarizability gamma0 using manifestly Lorentz covariant baryon chiral perturbation theory including the intermediate contribution of the isospin-3/2 states. As at the considered order the extraction of gamma0 is a pure prediction of chiral perturbation theory and does not depend on renormalization schemes, the obtained values are a good...

53. Muon capture on the deuteron

AlaaEldeen Elmeshenb (Jagiellonian University, Krakow)

02/07/2015, 13:10

Few-Body Physics Working Group

Poster

The study of few-nucleon system is interesting and important. It gives a microscopic description of complex systems within the framework of modern concepts of nucleon-nucleon and many-body interactions. Using the muon capture process is an ideal tool to study few-nucleon systems. In this work we plan to investigate the µ− + d → ν_µ + n + n capture reaction. This reaction is interesting for...

27. Roper mass in chiral perturbation theory

Xiu-Lei Ren (Beihang University/ IPN Orsay)

02/07/2015, 13:10

Hadron Structure and Meson-Baryon Interaction Working Group

Poster

Understanding the nature of the Roper resonance is of particular interest. Its mass, for example, shows a very unusual pattern: it is lower than the negative parity state N(1535). Also, the Roper is expected to play a role in low energy observables due to its closeness to the nucleon and Delta(1232). We report on a systematic study of the nucleon, Delta(1232), and Roper masses in heavy...

74. Single and double Dalitz decays of pi^0, eta and eta' through rational approximants

Sergi González-Solís (IFAE-Autonomous University of Barcelona)

02/07/2015, 13:10

Goldstone Boson Working Group

Poster

I will analyze the anomalous single and double Dalitz decays of the neutral pseudoscalar mesons, P → l+ l− γ and P → l+ l− l+ l− (P = π , η, η' ; l= e or µ), employing a model-independent transition form factor (TFF) of the Pγ∗γ(∗) vertices built up, through the use of rational approximants, from the current experimental data of the space-like TFF γ∗γ → P. Predictions for the branching ratios...

36. Status of chiral-scale perturbation theory

Rod Crewther (University of Adelaide)

02/07/2015, 13:10

Goldstone Boson Working Group

Poster

We observe that flavor current conservation constrains the structure of chiral-scale perturbation theory ChPT_sigma. This theory addresses the disagreement between experiment and lowest order chiral SU(3) x SU(3) perturbation theory (ChPT_3) for amplitudes involving the f_0(500) resonance and O(m_K) extrapolations in momenta. In ChPT_sigma, it is assumed that 3-flavor QCD has an infrared fixed...

38. The a_0(980) revisited

Thomas Wolkanowski-Gans (Goethe-Universität Frankfurt am Main)

02/07/2015, 13:10

Goldstone Boson Working Group

Poster

A way to understand the light scalar sector of hadron physics is by applying a type of dynamical generation in which additional resonances arise as companion poles from quark-antiquark seed states by incorporating mesonic loops at the level of S-wave propagators [1−3]. Along this line, we first repeat and complete the calculations of previous works of Tornqvist and Roos (TR) and Boglione and...

114. Understanding pion through QCD

Khepani Raya (University of Michoacan, Morelia)

02/07/2015, 13:10

Goldstone Boson Working Group

Poster

We present recent advances in the study of the Pion structure through Dyson-Schwinger Equations, the equations of motion of QCD. In particular, we discuss the neutral pion to two photons transition form factor, a problem which involves careful parametrizations of the quark propagator and Bethe-Salpeter Amplitudes. This calculation is relevant for future experiments to be conducted at Belle II.