scholarly journals One-Loop Corrections to Polarization Observables

2004 ◽  
pp. 212-244 ◽  
Author(s):  
J.G. Körner ◽  
M.C. Mauser
Keyword(s):  
Polarization Observables

scholarly journals Forward-backward angle asymmetry and polarization observables in high-energy deuteron photodisintegration

2004 ◽  
Vol 19 (1) ◽  
pp. 117-123 ◽  
Author(s):  
V. Yu Grishina ◽  
L. A. Kondratyuk ◽  
W. Cassing ◽  
E. De Sanctis ◽  
M. Mirazita ◽  
...  
Keyword(s):  
High Energy ◽  
Deuteron Photodisintegration ◽  
Polarization Observables ◽  
Backward Angle

scholarly journals Differential cross sections and polarization observables from CLAS K⁎ photoproduction and the search for new N⁎ states

2017 ◽  
Vol 771 ◽  
pp. 142-150 ◽  
Author(s):  
A.V. Anisovich ◽  
K. Hicks ◽  
E. Klempt ◽  
V.A. Nikonov ◽  
A. Sarantsev ◽  
...  
Keyword(s):  
Cross Sections ◽  
Differential Cross ◽  
Differential Cross Sections ◽  
Polarization Observables

scholarly journals General helicity formalism for two-hadron production in e+e− annihilation within a TMD approach

2021 ◽  
Vol 2021 (10) ◽  
Author(s):  
Umberto D’Alesio ◽  
Francesco Murgia ◽  
Marco Zaccheddu
Keyword(s):  
Transverse Momentum ◽  
Hadron Production ◽  
Probabilistic Interpretation ◽  
Leading Order ◽  
Transverse Momentum Dependent ◽  
Factorization Scheme ◽  
Helicity Formalism ◽  
Double Polarization ◽  
Fragmentation Functions ◽  
Polarization Observables

Abstract We present the complete leading-order results for the azimuthal dependences and polarization observables in e+e−→ h1h2 + X processes, where the two hadrons are produced almost back-to-back, within a transverse momentum dependent (TMD) factorization scheme. We consider spinless (or unpolarized) and spin-1/2 hadron production and give the full set of the corresponding quark and gluon TMD fragmentation functions (TMD-FFs). By adopting the helicity formalism, which allows for a more direct probabilistic interpretation, single- and double-polarization cases are discussed in detail. Simplified expressions, useful for phenomenological analyses, are obtained by assuming a factorized Gaussian-like dependence on intrinsic transverse momenta for the TMD-FFs.

scholarly journals Recent results from the CBELSA/TAPS experiment at ELSA

2020 ◽  
Vol 241 ◽  
pp. 01001
Author(s):  
Farah Afzal
Keyword(s):  
Final States ◽  
Excitation Spectra ◽  
Unpolarized Cross Section ◽  
Polarized Target ◽  
Double Polarization ◽  
Perturbative Regime ◽  
Measured Polarization ◽  
Polarization Observables ◽  
The Impact ◽  
Photoproduction Reactions

In order to gain a better understanding of the dynamics inside the nucleon and of the non-perturbative regime of QCD, the nucleon excitation spectra and the properties of nucleon resonances are investigated. An essential experimental tool to achieve this goal is the study of different photoproduction reactions. Partial wave analyses are performed in order to obtain information about the contributing resonances. A complete experiment is needed to extract the underlying amplitudes unambiguously, which requires the measurement of carefully chosen single and double polarization observables in addition to the unpolarized cross section. The CBELSA/TAPS experiment in Bonn offers the possibility to measure several polarization observables using a linearly or circularly polarized photon beam and with a longitudinally or transversely polarized target. This contribution gives an overview of recently measured polarization observables in different final states. The impact of the new data is discussed.

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