First measurement of the polarization observable E in the p→(γ→,π+)n reaction up to 2.25 GeV

@article{Strauch2015FirstMO,
  title={First measurement of the polarization observable E in the p→($\gamma$→,$\pi$+)n reaction up to 2.25 GeV},
  author={S. Strauch and William J. Briscoe and Michael Doring and Eberhard Klempt and V. A. Nikonov and Eugene Pasyuk and Deborah Ronchen and Andrey V. Sarantsev and Igor I. Strakovsky and Ron Workman and K. Adhikari and Dasuni Adikaram and M D Anderson and S. Anefalos Pereira and A. V. Anisovich and Rafael Badui and J. Ball and V. Batourine and M. Battaglieri and I. Bedlinskiy and Nawal Benmouna and Angela Biselli and James Brock and William Brooks and Volker Burkert and T. Cao and C. Carlin and D. S. Carman and Andrea Celentano and Shloka Chandavar and Gabriel Charles and Luca Colaneri and Philip Lawrence Cole and Nicholas Compton and M. Contalbrigo and Olga Cortes and Volker Crede and Natalya Dashyan and A. D’angelo and Raffaella De Vita and Enzo De Sanctis and Alexandre Deur and Chaden Djalali and Michael Dugger and R. Dupr{\'e} and Hovanes Egiyan and A. El Kacimi Alaoui and Lamiaa El Fassi and Latifa Elouadrhiri and Paul Michael Eugenio and G. Fedotov and Stuart Fegan and A. Filippi and J. A. Fleming and Tony Andrew Forest and Ahmed Fradi and Nerses Gevorgyan and Y. S. Ghandilyan and Kevin Giovanetti and F. Girod and D. I. Glazier and Wesley Gohn and E. N. Golovatch and Ralf W. Gothe and Keith A. Griffioen and Michel Guidal and L . B. Guo and Kawtar Hafidi and Hrachya Hakobyan and Charles Hanretty and Nathan Harrison and M. Hattawy and Kenneth H. Hicks and Dao Ho and Maurik Willem Holtrop and S. M. Hughes and Y. Ilieva and David Ireland and B. S. Ishkhanov and E. Isupov and David G. Jenkins and H. Jiang and H. S. Jo and Kyungseon Joo and Sylvester Joosten and Christopher Keith and Dustin Keller and George Khachatryan and M. Khandaker and Andrey Kim and W. Kim and Andi Klein and F. Klein and Valery Kubarovsky and Sebastian E. Kuhn and Paolo Lenisa and Kenneth Livingston and H. Y. Lu and I J D Macgregor and Nikolai Markov and B. Mckinnon and David George Meekins and Christopher Meyer and V. I. Mokeev and Rachel Montgomery and C. I. Moody and Herv{\'e} Moutarde and Aram Movsisyan and E. Munevar and Carlos Mu{\~n}oz Camacho and P. Nadel-Turonski and Lelia Net and Silvia Niccolai and Gabriel Niculescu and Ioana Niculescu and Mikhail Osipenko and Alexander Ostrovidov and K. Park and Peng Peng and William Phelps and J J Phillips and Silvia Pisano and O. I. Pogorelko and S G Pozdniakov and Joseph Price and S{\'e}bastien Procureur and Yelena Prok and Dan Protopopescu and Andrew Puckett and Brian A. Raue and Marco Ripani and Barry Ritchie and Alessandro Rizzo and G. Rosner and Priyashree Roy and F. Sabati'e and C. Salgado and Diane Schott and Reinhard A Schumacher and Erin Seder and Mikell Lee Seely and Igor Senderovich and Yu. Sharabian and Ani Simonyan and Iu. A. Skorodumina and G. D. Smith and Daniel I. Sober and Daria Sokhan and N Sparveris and Paul Stoler and Stepan Stepanyan and V. V. Sytnik and Mauro Gino Taiuti and Ye Tian and Arjun Trivedi and Ross J. Tucker and Maurizio Ungaro and H. Voskanyan and Eric Voutier and Natalie Kathleen Walford and D P Watts and X. Wei and Martin Wood and N. Zachariou and Lorenzo Zana and J. Zhang and Z. W. Zhao and Irene Zonta},
  journal={Physics Letters B},
  year={2015},
  volume={750},
  pages={53-58}
}
21 Citations

Figures and Tables from this paper

Measurement of the helicity asymmetry E in ω → π+π−π0 photoproduction
The double-polarization observable E was studied for the reaction γp → pω using the CEBAF Large Acceptance Spectrometer (CLAS) in Hall B at the Thomas Jefferson National Accelerator Facility and the
Measurement of the beam asymmetry Σ and the target asymmetry T in the photoproduction of ω mesons off the proton using CLAS at Jefferson Laboratory
The photoproduction of ω mesons off the proton has been studied in the reaction γp → p ω using the CEBAF Large Acceptance Spectrometer (CLAS) and the frozen-spin target in Hall B at the Thomas
Double-polarization observable G in neutral-pion photoproduction off the proton
Abstract.This paper reports on a measurement of the double-polarization observable G in $ \pi^0$π0 photoproduction off the proton using the CBELSA/TAPS experiment at the ELSA accelerator in Bonn. The
Measurement of the helicity asymmetry E for the reaction $$ \gamma p\rightarrow \pi ^0 p$$ γ p → π
A measurement of the double-polarization observable E for the reaction $$\gamma p\rightarrow \pi ^0 p$$ γ p → π 0 p is reported. The data were taken with the CBELSA/TAPS experiment at the ELSA
N* Experiments and what they tell us about Strong QCD Physics
I give an overview on experimental studies of the spectrum and the structure of the excited states of the nucleon and what we can learn about their in ternal structure. One focus is on the efforts to
Baryon Spectroscopy with Polarization Observables from CLAS
The spectrum of nucleon excitations is dominated by broad and overlapping resonances. Polarization observables in photoproduction reactions are key in the study of these excitations. They give
Nucleon Spectroscopy with CLAS
Meson photoproduction is an important tool in the study of nucleon resonances. The spectrum of broad and overlapping nucleon excitations can be greatly clarified by use of polarization observables.
New graphical criterion for the selection of complete sets of polarization observables and its application to single-meson photoproduction as well as electroproduction
This paper combines the graph-theoretical ideas behind Moravcsik’s theorem with a completely analytic derivation of discrete phase-ambiguities, recently published by Nakayama. The result is a new
...
...

References

SHOWING 1-10 OF 39 REFERENCES
Measurement of the helicity dependence for the gamma p ---> n pi+ channel in the second resonance region
The helicity dependence of the γp→nπ+ reaction has been measured for the first time in the photon energy range from 450 to 790 MeV. The experiment, performed at the Mainz Microtron (MAMI), used a
Helicity dependence of the gamma p -> N pi channels and multipole analysis in the Delta region
A high-quality double-polarization data set for the helicity dependence of the total and differential cross-sections for both gammap --> Npi channels in the Delta region has been obtained in the
Unified Chew-Mandelstam SAID analysis of pion photoproduction data
A wealth of N ! �N data, for single- and doublepolarization observables, is anticipated from electromagnetic facilities worldwide over the coming months and years. These data will be pivotal in
First measurement of the helicity asymmetry for γp → pπ0 in the resonance region.
The first measurement of the helicity dependence of the photoproduction cross section of single neutral pions off protons is reported for photon energies from 600 to 2300 MeV, covering nearly the
Helicity amplitudes A1/2 and A3/2 for the D13(1520) resonance obtained from the gamma-->p-->-->ppi(0) Reaction.
The helicity dependence of the gamma-->p-->-->ppi(0) reaction has been measured for the first time in the photon-energy range from 550 to 790 MeV. The experiment, performed at the Mainz microtron
Progress towards understanding baryon resonances.
TLDR
Recent results from photo- and electroproduction experiments provide intriguing indications for new states and shed light on the structure of some of the known nucleon excitations, and an overview of theoretical approaches are given.
PHOTON AND ELECTRON POLARIZATION IN HIGH-ENERGY BREMSSTRAHLUNG AND PAIR PRODUCTION WITH SCREENING
The matrix element for bremsstrahlung and patr production is written in a particularly simple form which reduces to the well-known matrix element for nonrelativistic energies, in terms of a vector
...
...