Electroproduction of $\pi^+ n$, $\pi^- p$ and $K^+ \Lambda$, $K^+ \Sigma^0$ Final States Above the Resonance Region

Brauel, P. ; Canzler, T. ; Cords, D. ; et al.
Z.Phys.C 3 (1979) 101, 1979.
Inspire Record 142872 DOI 10.17182/hepdata.15909

The reactionsΣvp→π+n,K+Λ,K+∑0 andΣvn→π+n were studied at invariant hadronic masses around 2.2. GeV forQ2=0.06, 0.28, 0.70, and 1.35 GeV2. The main results are: At small |t| the π+ production is dominated by longitudinally polarized photons and can be described by one pion exchange. At low |t| the transverse (π+n) cross section drops steeply withQ2, but remains roughly constant forQ2≧0.5 GeV2. For |t⊢≧0.8 GeV2, (π+n/dt) is almost independent ofQ2. The integrated cross section (π+n) shows a similarQ2-dependence asσtot (γvp) forQ2≧0.28 GeV2. The ratioσ(π-p)/σ(π+n) atQ2=0.70 and 1.35 GeV2 for |t|≧0.6 GeV2 is smaller than in photoproduction and close to 1/4. The ratioσ(K+∑0 decreases steeply withQ2 following roughly the predictions of the quark-parton model.

28 data tables

PHI AND EPSILON DEPENDENCE FITTED TO GIVE COMPONENTS OF CROSS SECTION.

No description provided.

No description provided.

More…

Determination of the Longitudinal and the Transverse Part in pi+ Electroproduction

Ackermann, H. ; Azemoon, T. ; Gabriel, W. ; et al.
Nucl.Phys.B 137 (1978) 294-300, 1978.
Inspire Record 121358 DOI 10.17182/hepdata.35094

We report on an experiment where the different contributions from the transverse and longitudinal polarization of the virtual photon are measured separately for the reaction e − p→e − π + n. The data taken above the resonance region at small ∣ t ∣ values in the q 2 range of ∣ q 2 ∣ < 0.5 GeV 2 show a clear dominance of the longitudinal part of the cross section and are well described by a generalized Born-term model. Using this model the electromagnetic form factor of the pion is determined. At q 2 = −0.35 GeV 2 one gets F π = 0.598 ± 0.021.

3 data tables

No description provided.

AVERAGED OVER RESTRICTED PHI RANGE. THIS IS MAINLY (D(SIG(NAME=U))/DT + EPS*D(SIG(NAME=L))/DT) SINCE COMPONENTS P AND I ARE EXPECTED TO REMAIN SMALL FOR LARGER -T.

No description provided.


Separation of Sigma-L and Sigma-u in pi+ Electroproduction Above the Resonance Region

Brauel, P. ; Canzler, T. ; Cords, D. ; et al.
Phys.Lett.B 69 (1977) 253-256, 1977.
Inspire Record 119473 DOI 10.17182/hepdata.27538

The four cross section components σ U , σ L , σ P and σ I were separated in the reaction γ V + p → π + + n at an electron four momentum transfer of Q 2 = 0.70 GeV 2 and an invariant hadronic mass of 2.19 GeV in the range of t between t min and −0.28 GeV 2 . The longitudinal cross section σ L dominates at small |t| and decreases rapidly with increasing |t|. The data are in rough agreement with the prediction of a generalized Born term model. The resulting value for the pion electromagnetic form factor is F π = 0.42 ± 0.015.

2 data tables

TMIN = 0.024 GEV**2.

No description provided.


Pi+ Electroproduction Above the Resonance Region

Brauel, P. ; Canzler, T. ; Cords, D. ; et al.
Phys.Lett.B 65 (1976) 181-183, 1976.
Inspire Record 109471 DOI 10.17182/hepdata.45245

The reaction e + p → e' + n + π + was studied detecting e' and e' and π + in coincidence at an invariant hadronic mass of 2.19 GeV. The measurements were performed at electron four-momentum transfers squared of Q 2 = 0.06, 0.28, 0.70, and 1.35 GeV 2 in the range of t = ( γ v − π ) 2 between t min and −1.0 GeV 2 . The cross section d 2 σ / dtd was found to be roughly independent of Q 2 for Q 2 > 0.7 GeV 2 and ∥ t ∥ > 0.2 GeV 2 .

7 data tables

No description provided.

No description provided.

No description provided.

More…