Conveners
Low Energy Spin Physics with Lepton, Photon and Hadron Probes
- Hubert Spiesberger (Institut für Physik, University Mainz)
- Frank Maas (Helmholtz-Institut Mainz)
Low Energy Spin Physics with Lepton, Photon and Hadron Probes
- Frank Maas (Helmholtz-Institut Mainz)
- Hubert Spiesberger (Institut für Physik, University Mainz)
Mr
Razvan-Daniel Bucoveanu
(Johannes Gutenberg University)
11/09/2018, 14:30
Low Energy Spin Physics with Lepton, Photon and Hadron Probes
Parallel Sessions
The planned P2 experiment at MESA aims to measure the weak mixing angle with high precision at low momentum transfer from parity violating electron-proton scattering. In order to match this precision, higher order corrections to the asymmetry have to be taken into account. In this talk I will present the effects of 2nd order QED corrections to the asymmetry and the shift in Q2 due to these corrections.
Dr
Boxing Gou
(Helmholtz-Institut Mainz)
11/09/2018, 14:50
Low Energy Spin Physics with Lepton, Photon and Hadron Probes
Parallel Sessions
The asymmetry in the scattering of transversely polarized electrons off unpolarized protons or deuterons arises from the imaginary part of the two-photon exchange amplitude. The A4 collaboration at the MAMI accelerator has performed measurements at various beam energies between 300 MeV and 1.5 GeV both at forward and backward angles. We present an overview about published data and unpublished...
Dr
Sergey Dymov
(INFN)
11/09/2018, 15:10
Low Energy Spin Physics with Lepton, Photon and Hadron Probes
Parallel Sessions
The analyzing powers in proton-deuteron elastic and
proton-neutron quasi-elastic scattering were measured at small
angles using a polarized proton beam at the COSY storage ring
incident on an unpolarized deuterium target. Data were taken at 796
MeV and five energies from 1600 MeV to 2400 MeV. The analyzing
power in pd elastic scattering was studied by detecting the low
energy recoil...
Dr
Kiyoshi Tanida
(Japan Atomic Energy Agency)
11/09/2018, 15:30
Low Energy Spin Physics with Lepton, Photon and Hadron Probes
Parallel Sessions
The Belle II experiment is a substantial upgrade of the Belle detector and will operate at the SuperKEKB energy-asymmetric $e^+ e^-$ collider. The accelerator has already successfully completed the first phase of commissioning in 2016 and first electron positron collisions in Belle II were obtained on April 26, 2018. The design luminosity of SuperKEKB is $8 \times 10^{35}$ cm$^{-2}$s$^{-1}$...
Eugene Chudakov
(Jefferson Lab)
11/09/2018, 15:50
Low Energy Spin Physics with Lepton, Photon and Hadron Probes
Parallel Sessions
We will present preliminary results for the J/psi close-to-threshold
photoproduction obtained in the GlueX experiment at Jefferson Lab.
Close-to-threshold photoproduction gamma+p-->J/psi+p probes small-size
gluon configuration in the proton. This reaction may also contain a
contribution from the s-channel production of the LHCb pentaquark
P(4.4)-->J/psi+p at beam energies of about 10 GeV....
Dr
Mikhail Gorshteyn
(Mainz University)
11/09/2018, 16:40
Low Energy Spin Physics with Lepton, Photon and Hadron Probes
Parallel Sessions
We propose a novel dispersion relations-based evaluation of the $\gamma W$-box correction to the universal radiative correction $\Delta_R^V$ to the neutron and nuclear $\beta$ decay. This correction is the main source of the theoretical uncertainty in extracting the value of $V_{ud}$ from those decay processes. We relate the needed input into the dispersion integral to the data on neutrino and...
Isabella Garzia
(FE)
11/09/2018, 17:00
Low Energy Spin Physics with Lepton, Photon and Hadron Probes
Parallel Sessions
Electromagnetic form factors are fundamental observables needed to parametrize the electric and magnetic structure of hadrons and used to probe the strong interaction.
In this contribution we report on the recent measurements of baryon electromagnetic form factors at the BESIII experiment in Beijing.
The BESIII spectrometer is located at the BEPCII collider, a symmetric e+e- collider running...
Paolo Pedroni
(INFN-Pavia)
11/09/2018, 17:20
Low Energy Spin Physics with Lepton, Photon and Hadron Probes
Parallel Sessions
In this presentation I will discuss the results of a recent
work on the extraction of the scalar dipole dynamic polarizabilities (DDPs) from proton Real Compton Scattering (RCS) data below pion production threshold.
The dynamical polarizabilities are energy dependent functions which parametrize the response of the internal degrees of freedom of the
proton to an external, real-photon field...
