Conveners
Light Baryons: 1
- Elke-Caroline Aschenauer (Brookhaven Natl. Lab. (BNL))
Light Baryons: 2
- Reinhard Beck (Univ. Bonn)
Light Baryons: 3
- Eva-Maria Kabuss (Mainz university)
Light Baryons: 4
- Mauro Anselmino (Torini University & INFN)
Light Baryons: 5
- Ulrike Thoma (HISKP. University of Bonn)
Description
Spectroscopy and structure (formfactors, parton distributions functions, spin) of light baryons
Volker Credé
(Florida State University)
6/13/11, 2:30 PM
Light Baryons
talk
Nucleons are complex systems of confined quarks and exhibit characteristic spectra of excited states. Highly-excited nucleon states are sensitive to details of quark confinement which is poorly understood within Quantum Chromodynamics (QCD), the fundamental theory of strong interactions. Observing and understanding these higher-mass resonances is crucial, but they are difficult to observe...
Marcus Gruener
(Helmholtz-Institut für Strahlen- und Kernphysik)
6/13/11, 3:00 PM
Light Baryons
talk
The excitation spectrum of the nucleon consists of several overlapping resonances. To identify these resonances, and their contributions to the measured cross sections, a partial wave analysis is used. One needs at least a set of eight, well chosen, single and double polarisation observables to give an unambiguous solution. With the Crystal Barrel/TAPS setup at ELSA, single and double...
Jonas Müller
(Universität Bonn)
6/13/11, 3:25 PM
Light Baryons
talk
One of the open challenges in subnuclear physics is to understand the nonperturbative regime of Quantum chromodynamics, including the world of the nucleon and its excitations. In order to extract the contributing baryon resonances in photoproduction experiments, partial wave analyses need to be performed. A complete experiment is required to unambiguously determine the contributing amplitudes....
Mr
Alexander Austregesilo
(TU München)
6/13/11, 4:30 PM
Light Baryons
talk
COMPASS is a fixed-target experiment at CERN SPS which investigates the structure and spectroscopy of hadrons. The experimental setup features a large acceptance and high momentum resolution spectrometer including particle identification and calorimetry and is therefore ideal to cover a broad range of different topics. During in total 9 weeks in 2008 and 2009, a 190 GeV/c proton beam impinging...
Ms
Lilian Witthauer
(Basel University, Department of Physics)
6/13/11, 4:50 PM
Light Baryons
talk
Recent experiments at the Mainz MAMI and the Bonn ELSA accelerators have studied the excitation spectrum of the nucleon with photoproduction of η-mesons off light target nuclei (2H, 3He). Special attention was given to the photoexcitation of the neutron in order to investigate the isospin structure of electromagnetic resonance couplings. The resulting cross sections shows a narrow in the...
Prof.
Maxim Polyakov
(Ruhr University Bochum)
6/13/11, 5:10 PM
Light Baryons
talk
We review recent evidences for putative narrow nucleon N$^*$(1685)-- the candidate for the non-strange member of the exotic anti-decuplet of baryons.
Manuel Dieterle
(Basel University, Department of Physics)
6/13/11, 5:30 PM
Light Baryons
talk
Meson photoproduction allows a detailed investigation of the excitation spectrum of the nucleon and of the interactions of mesons with nucleons and nuclei. Up to now much more attention has been paid to the electromagnetic excitations of the free proton than to its neutron counter parts. These are essential for the understanding of their isospin decomposition. In addition in certain states the...
Mr
Xiaotao LIAO
(Institute of High Energy Physics)
6/13/11, 5:50 PM
Light Baryons
talk
Based on 106×10^6 psi' events collected with BESIII at the BEPCII, the decay of psi'--> ppbar eta is studied. The exicted baryon N(1535) is clearly observed and the results from PWA are presented.
Dr
Bernhard Musch
(Jefferson Lab)
6/14/11, 2:30 PM
Light Baryons
talk
Certain single-spin asymmetries in semi-inclusive DIS (SIDIS) and the Drell-Yan process (DY) can be explained by transverse momentum dependent parton distribution functions (TMDs) that are predicted to differ in sign for SIDIS and DY. On the lattice, we can use non-local operators with U-shaped Wilson lines to study these TMDs, in particular the Sivers- and the Boer-Mulders function. We...
Dr
Pavel Kurilkin
(JINR. Dubna)
6/14/11, 2:50 PM
Light Baryons
talk
The experimental results on the deuteron analyzing powers for the dp-elastic scattering and the dd->3Hp(dd->3Hen) reaction at intermediate energies are reported.
These data were obtained using polarized deuteron beams at Nuclotron (JINR, Russia) and RARF (RIKEN, Japan).
The results on the analyzing powers Ay, Ayy and Axx in dp- elastic scattering
obtained at Nuclotron at 880 MeV and 2000...
Mr
Christian Hoeppner
(TU Muenchen)
6/14/11, 3:10 PM
Light Baryons
talk
The measurement of unpolarized high-$p_T$ hadron-production cross
sections provides an important benchmark for the applicability of
perturbative QCD (pQCD) calculations, especially at lower center-of-
mass energies, where corrections beyond the next-to-leading order
could become important. These calculations rely on the factorization
of unpolarized and polarized cross sections into...
Prof.
Eva-Maria Kabuss
(Mainz university)
6/14/11, 4:30 PM
Light Baryons
talk
The COMPASS experiment is a fixed target experiment at the CERN SPS using muon and hadron beams for the investigation of the spin structure of the nucleon and hadron spectroscopy. The main objective of the muon physics programme is the study of the nucleon spin. COMPASS has accumulated data during 6 years scattering polarised muons off a longitudinally or a transversely polarised
deuteron...
Ms
Nour Makke
(CEA/Saclay)
6/14/11, 4:50 PM
Light Baryons
talk
Fragmentation functions (FF) describe the process of fragmentation of quarks into hadrons. They are needed for the determination of polarized and unpolarized quark distribution functions from semi-inclusive deep inelastic scattering (SIDIS) data. While the pion FFs are reasonably well determined, kaon FFs are poorly known and provide the largest source of uncertainty for the extraction of the...
Eulogio Oset
(IFIC , University of Valencia)
6/14/11, 5:10 PM
Light Baryons
talk
The K^- induced production of Lambda(1405) is investigated in K^- d to pi Sigma n reaction based on coupled-channels chiral dynamics, in order to discuss the mass of the Lambda(1405) and the prediction of two Lambda(1405) states made by the chiral unitary theory. We find that the K^-d to Lambda(1405)n process favors the production of Lambda(1405) initiated by the KbarN channel, which favors...
Dr
Valery Lyubovitskij
(Institute of Theoretical Physics, Tuebingen University)
6/14/11, 5:30 PM
Light Baryons
talk
Mesons and baryons are considered in a soft-wall holographic approach [1,2] based on the correspondence of string theory in AdS space and conformal field theory in physical space-time [3]. Our approach is also based on ideas of the light-front holography approach developed by Brodsky and de Teramond [4]. The model generates Regge trajectories linear in n and J(L) for the hadronic mass...
Prof.
Pedro Gonzalez
(University of Valencia)
6/14/11, 5:50 PM
Light Baryons
talk
From a Faddeev calculation for the pion-(Delta rho)(N(1675)) system, performed with the Fixed Center Approximation within a Chiral Unitary framework, we show the plausible existence of three dynamically generated I (JP) = 3/2 (5/2+) baryon states below 2.3 GeV whereas only two resonances, Delta(5/2+) (1905) (∗∗∗∗) and Delta(5/2+) (2000) (∗∗), are cataloged in the Particle Data Book Review[1]....
Mr
Simon Sirca
(Faculty of Mathematics and Physics, University of Ljubljana)
6/16/11, 2:30 PM
Light Baryons
talk
We present a method to calculate pion scattering and
electro-production amplitudes in a coupled-channel framework
incorporating quasi-bound quark-model states. All relevant
low-lying nucleon resonances in the P33, P11, and S11 partial waves
have been covered, including the Delta(1232), the N*(1440) and,
most recently, the negative-parity resonances N*(1535) and
N*(1650). The...
Dr
Victor Mokeev
(Jefferson Lab)
6/16/11, 2:55 PM
Light Baryons
talk
Studies of nucleon resonance electrocouplings for excited proton states at various photon virtualities Q2 represent an important part in the N* Program with the CLAS detector [1]. The CLAS measurements
extend the data on differential cross sections for N\pi and N\eta
electroproduction channels, longitudinally polarized beam/beam-target asymmetries for \pi electroproduction off protons...
Mr
Ki-Seok Choi
(Graz Univ)
6/16/11, 3:20 PM
Light Baryons
talk
We present covariant predictions for all electromagnetic and axial form factors of baryon ground states with flavors up, down, and strange, as calculated from the relativistic constituent quark model with Goldstone-boson-exchange hyperfine interactions. In addition we give the theoretical values for electric radii, magnetic moments, and axial charges. In all cases, where a comparison to...
