Conveners
Parallel II: B9 Light Quarks
- Hagop Sazdjian (University Paris-Sud)
Mr
Tomas Husek
(Charles University (CZ))
12/09/2014, 14:00
Section B: Light Quarks
In this talk we will discuss two important processes of the low energy hadron physics: the Dalitz decay of $\pi^0$ and $\pi^0\to e^+e^-$.
We briefly summarize experimental and theoretical results on the rare decay $\pi^0\to e^+e^-$. The analytical two-loop QED corrections together with the bremsstrahlung contribution beyond the soft-photon approximation are reviewed. Using the leading...
Dr
Richard Williams
(University of Giessen)
12/09/2014, 14:20
Section B: Light Quarks
We present a calculation of the Hadron spectrum in the Dyson-Schwinger/Bethe-Salpeter
approach to continuum QCD. A sophisticated truncation featuring all covariant structures
of the quark-gluon vertex, with its inherent flavour dependence, is employed in a framework
that preserves the dynamics of chiral symmetry breaking. The study is suggestive as to the
relevance of additional resonant...
Mr
Walter Heupel
(Justus-Liebeig University Giessen)
12/09/2014, 14:40
Section B: Light Quarks
In the framework of Dyson-Schwinger equations, we present the first calculation of a four-body Bethe-Salpeter equation as required for the covariant description of tetraquarks. In a first approach we focus on the lightest tetraquark candidate, the $f_0(500)$, with an aim to determine the complete scalar nonet. Further investigations in this approach will focus on tetraquarks in the vector...
Jenifer Nebreda Manjon
(YITP, Kyoto University)
12/09/2014, 15:00
Section B: Light Quarks
Our results on obtaining the Regge trajectory of a resonance from its pole in a
scattering process and from analytic constraints in the complex angular momentum plane will be presented. The method, suited for resonances that dominate an elastic
scattering amplitude, has been applied to the rho(770), f_2(1275), f_2´(1525) and the f0(500) resonances.
Whereas for the first three we obtain...
Mr
Sergi Gonzàlez-Solís
(IFAE-U.A.Barcelona)
12/09/2014, 15:20
Section B: Light Quarks
We illustrate how the $K^\star(1410)$ resonance parameters can be extracted with improved precision by exploiting the synergy of a combined study of the
$\tau^-\to (K\pi)^-\nu_\tau$ and $\tau^-\to K^-\eta\nu_\tau$ decays for the first time. On the one hand we take advantage of the much larger statistics
accumulated for the former decay in the $K_S\pi^-$ channel, while on the other we also...
Vicent Mateu
(University of Vienna)
12/09/2014, 15:40
Section B: Light Quarks
For the e+e- C-parameter we use soft-collinear effective theory to derive a factorization theorem, and then compute the cross section at N3LL + O(alphas^3). Differences with Thrust are highlighted. Our result holds for C in the peak, tail, and far tail regions, and we treat hadronization effects using a universal nonperturbative soft function defined in field theory. We analyze all available...
