6 research outputs found
pi+- p differential cross sections at low energies
Differential cross sections for pi- p and pi+ p elastic scattering were
measured at five energies between 19.9 and 43.3 MeV. The use of the CHAOS
magnetic spectrometer at TRIUMF, supplemented by a range telescope for muon
background suppression, provided simultaneous coverage of a large part of the
full angular range, thus allowing very precise relative cross section
measurements. The absolute normalisation was determined with a typical accuracy
of 5 %. This was verified in a simultaneous measurement of muon proton elastic
scattering. The measured cross sections show some deviations from phase shift
analysis predictions, in particular at large angles and low energies. From the
new data we determine the real part of the isospin forward scattering
amplitude.Comment: 13 pages, 5 figures. To appear in PL
QCD and strongly coupled gauge theories : challenges and perspectives
We highlight the progress, current status, and open challenges of QCD-driven physics, in theory and in experiment. We discuss how the strong interaction is intimately connected to a broad sweep of physical problems, in settings ranging from astrophysics and cosmology to strongly coupled, complex systems in particle and condensed-matter physics, as well as to searches for physics beyond the Standard Model. We also discuss how success in describing the strong interaction impacts other fields, and, in turn, how such subjects can impact studies of the strong interaction. In the course of the work we offer a perspective on the many research streams which flow into and out of QCD, as well as a vision for future developments.Peer reviewe
ACTION OF BIMETALLIC Co(II)-Sn(IV), Co(II)-Ge(IV) COMPLEX WITH A HYDROXYCARBONIC(PHOSPHONIC) ACIDS OF KINETICS POLYCONDENSATION AND PROPERTIES OF POLYGLYCOLMALEINATPHTALATE
Bimetallic complexes of Co(II)-Sn(IV), Co(II)-Ge(IV) with citric, tartaric, xylaric and 1-hydroxyethylidenediphosphonic acids as activators of polycondensation of phthalic and maleic anhydride with ethylene glycol are investigated. Initial speeds of copolymerization with the threeethylenglycoldimethacrylates, the method of obtaining coatings for hightemperature hardening with epoxy resins have been defined
Cross section for γn→π0n measured at the Mainz A2 experiment
The
γ
n
→
π
0
n
differential cross section evaluated for 27 energy bins span the photon-energy range 290–813 MeV (
W
=
1.195
–1.553 GeV) and the pion c.m. polar production angles, ranging from
18
∘
to
162
∘
, making use of model-dependent nuclear corrections to extract
π
0
production data on the neutron from measurements on the deuteron target. Additionally, the total photoabsorption cross section was measured. The tagged photon beam produced by the 883 MeV electron beam of the Mainz Microtron MAMI was used for the
π
0
-meson production. Our accumulation of
3.6
×
10
6
γ
n
→
π
0
n
events allowed a detailed study of the reaction dynamics. Our data are in reasonable agreement with previous A2 measurements and extend them to lower energies. The data are compared with predictions of previous said, maid, and BnGa partial-wave analyses and to the latest said fit MA19 that included our data. Selected photon-decay amplitudes
N
∗
→
γ
n
at the resonance poles are determined for the first time