HEPData Search

Showing 10 of 106 results

A measurement of the electric form-factor of the neutron through d(pol.)(e(pol.),e' n)p at Q2 = 0.5-(GeV/c)2.

The E93026 collaboration Zhu, H. ; Ahmidouch, A. ; Anklin, H. ; et al.

Phys.Rev.Lett. 87 (2001) 081801, 2001.

Inspire Record 556212 DOI 10.17182/hepdata.31418

We report the first measurement of the neutron electric form factor $G_E^n$ via $\vec{d}(\vec{e},e'n)p$ using a solid polarized target. $G_E^n$ was determined from the beam-target asymmetry in the scattering of longitudinally polarized electrons from polarized deuterated ammonia, $^{15}$ND$_3$. The measurement was performed in Hall C at Thomas Jefferson National Accelerator Facility (TJNAF) in quasi free kinematics with the target polarization perpendicular to the momentum transfer. The electrons were detected in a magnetic spectrometer in coincidence with neutrons in a large solid angle segmented detector. We find $G_E^n = 0.04632\pm0.00616 (stat.) \pm0.00341 (syst.)$ at $Q^2 = 0.495$ (GeV/c)$^2$.

1 data table match query

Table 1

No description provided.

Electroproduction of Single Charged Pions From Deuterons at $Q^2$ Approximately = to 0.5-{GeV}/$c^2$

Wright, J. ; Darvill, D.C. ; Davenport, M. ; et al.

Nucl.Phys.B 181 (1981) 403-420, 1981.

Inspire Record 154655 DOI 10.17182/hepdata.34298

The ratio of π − to π + electroproduction cross sections from deuterons has been measured in the resonance region at an average four-momentum transfer squared of 0.5 (GeV/ c ) 2 . Results are presented over a wide range of pion production angles and comparisons are made with theoretical predictions based on SU(6) w symmetry and the Melosh transformation.

6 data tables match query

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

More…

Cross-section Measurement of $\pi^- p \to \pi^- \pi^+ n$ Reaction Near Threshold

The OMICRON collaboration Kernel, G. ; Korbar, D. ; Krizan, P. ; et al.

Phys.Lett.B 216 (1989) 244-248, 1989.

Inspire Record 264989 DOI 10.17182/hepdata.29858

Result of cross section measurements for the reaction π − p → π − π + n are presented. They cover a range of incident pion momenta between 295 and 450 MeV/ c . It is the first time that the cross section has been measured so close to threshold. The experiment was performed with Omicron, a large-solid-angle spectrometer, which enables a measurement of the full set of kinematic variables. In the region of overlap there is a good agreement with other experiments. The extracted value for the chiral-symmetry-breaking parameter ξ is seen to be largely extrapolition dependent but the measured value of -0.5±0.8 leaves Weinberg's prediction of ξ =0 the only remaining choice.

1 data table match query

Table 1

No description provided.

rivet Analysis
Measurement of the Reaction $e^+ e^- \to \eta \pi^+ \pi^-$ in the Center-of-mass Energy Interval 1350-{MeV} to 2400-{MeV}

The DM2 collaboration Antonelli, A. ; Baldini, R. ; Calcaterra, A. ; et al.

Phys.Lett.B 212 (1988) 133-138, 1988.

Inspire Record 264144 DOI 10.17182/hepdata.29912

The e + e − → ηπ + π − reaction has been measured in the center of mass energy interval 1350–2400 MeV by the magnetic detector DM2 at the Orsay storage ring DCI. Under the hypothesis of only one large resonance the cross section is not fit in a satisfactory way. The branching ratio τ − → η − π 0 ν τ =(0.13 ± 0.02)% is deduced via CVC from the above measurement.

1 data table match query

Table 1

No description provided.

Collaboration

Subject_areas

Phrases

Observables

CM Energies (GeV)

Authors Reset

A measurement of the electric form-factor of the neutron through d(pol.)(e(pol.),e' n)p at Q2 = 0.5-(GeV/c)2.

Electroproduction of Single Charged Pions From Deuterons at $Q^2$ Approximately = to 0.5-{GeV}/$c^2$

Cross-section Measurement of $\pi^- p \to \pi^- \pi^+ n$ Reaction Near Threshold

rivet Analysis
Measurement of the Reaction $e^+ e^- \to \eta \pi^+ \pi^-$ in the Center-of-mass Energy Interval 1350-{MeV} to 2400-{MeV}

BACKWARD PHOTOPRODUCTION OF POSITIVE PIONS ON HYDROGEN

Search for rho Like Vector Mesons in the Mass Range 1.2-GeV to 3.0-GeV

A study of the elastic neutrino process $\nu + n \to \mu^- + p$

The Pion Electromagnetic Form-Factor in the Timelike Range 1.44-GeV2-9.0-GeV2

Hadron pair production by electron-positron colliding beams

Observation of a broad peak in the production of four charged pions by e+ e- collisions around 1.6 gev