Richard E. Taylor

Parity Non-Conservation in Inelastic Electron Scattering

Abstract We have measured parity violating asymmetries in the inelastic scattering of longitudinally polarized electrons from deuterium and hydrogen. For deuterium near Q2 = 1.6 (GeV/c)2 the asymmetry is (−9.5 × 10−5)Q2 with statistical and systematic uncertainties each about 10%.

Further measurements of parity non-conservation in inelastic electron scattering☆

Measurements of the y-dependence of the parity nonconserving asymmetries for inelastic electron scattering from deuterium. The measurements cover a range of y values from 0.15 to 0.36 and show only a small y-dependence. The results are in good agreement with the Weinberg-Salam model for sin/sup 2/theta/sub W/ = 0.224 +- 0.020. 20 references.

Measurement of the ratio of the proton form factors, GE/GM, at high momentum transfers and the question of scaling☆

Abstract Electron-proton elastic scattering cross sections have been measured at the Stanford Linear Accelerator Center at four-momentum transfers squared (q2) of 1.0, 1.5, 2.0, 2.5and 3.75 (GeV/c)2. The angular distributions at q2 = 2.5 and 3.75 (GeV/c)2are sufficient to provide values of the ratio GE/GMindependent of the results from other laboratories. Our results are compatible with scaling, GE(q2) = GM(q2)/μ, within the experimental errors.

Inelastic electron scattering from hydrogen at 50° and 60°☆

Abstract Inelastic electron scattering cross sections have been measured for four-momentum transfers between 4.1 GeV 2 and 30.5 GeV 2 . At the large scattering angles of this experiment, the dominant contribution to the cross section comes from the W 1 structure function. In the conventional scaling variables, x and x ′, this structure function does not exhibit scaling behavior, and at fixed x or x ′ it is found to decrease with increasing four-momentum transfer.

SEARCH FOR T-VIOLATION IN THE INELASTIC SCATTERING OF ELECTRONS FROM A POLARIZED PROTON TARGET.

The authors have searched for an asymmetry in the inelastic scattering of electrons from a polarized proton target in the region of resonance excitation, at values of four-momentum transfer squared of 0.4, 0.6 and 1.0 (GeV/c){sup 2}. Data were also taken using an incident positron beam in order to distinguish any possible effect of time-reversal violation from that due to higher-order ({alpha}{sup 3}) contributions to the scattering. No sizeable violation of time-reversal invariance was found.

COINCIDENCE ELECTROPRODUCTION IN THE REGION OF THE rho MESON.

Cross sections for the reaction ep-+epX, measured by detecting both the scattered electron and proton, are given for missing masses mx between 0 and 1 GeV/c’. A large cross section is observed at mx=O due to radiative processes, but the resolution of the apparatus is such that the contribution of the mx=O peak is small for rnxL 0.6 GeV/c2. Enhancements rare observed in the region of the rho meson at q2=0. 1 and 0.5 (GeV/c)2. The electroproduction of all states with mx between 0.7 and 0.83 GeV/c2 varies like e -7.5t for q2=0.1 (GeV/c)2, similar to missing mass photoproduction in this region, but for q2=0. 5 (GeV/c)2 it varies like e -3.5t . (Submitted to Phys. Rev. Letters. A preliminary version of this paper was submitted to the 1971 International Symposium on Electron and Photon Interactions at High Energies, Cornell University, Ithaca, New York, August 23-27, 1971.) * Work supported by the U. S. Atomic Energy Commission t Present address: University of Washington, Seattle, Washington ItPresent address: Bonn University, Bonn, Germany This letter reports the results of an inelastic electron scattering experiment at SLAC where a final state proton was detected in coincidence with the scattered electron, ep + epX. The measured variables are Eo, the incident electron energy, E’, 0 , and @, the momentum, polar scattering angle, and azimuthal angle of the scattered electron; and P P’ BP and

Transport Systems for High Intensity Beams

P’ the corresponding proton variables. These measurements uniquely determine mx, the mass of the unobserved state X. rnE=2G Pp cos0 I It-l y p-s2-t(l+ v/‘Mp) where q2=4EoE1sin2(0/2)= -(four momentum transfer from the electron)2, 1, =EO-E’ , &I = v, d = an t 2MpTp= -(four momentum transfer to the proton)2. Tp is the kinetic energy of the proton,Mp is its mass, and 8 is the w angle between

High-Energy Inelastic e p Scattering at 6-Degrees and 10-Degrees

andq. The cross section may be written’ d6, = r, d3”ab s dQdE’dtdmxdqq dtbxd9, where rT is the flux of virtual photons and Qq-is the azimuthal angle of 5 P around qwith respect to the electron scattering plane. d%abs/dtdmxd9, then represents the absorption of photons of mass q2 and energy v with a polarization parameter which is near unity for this experiment. During the experiment, E. and E1 were fixed at 20 and 13 GeV respectively. Two values of 8 were used, 1.124’ and 2. 51°, corresponding to q2=0. 1 and 0.5 (GeV/c)2. At each angle data were taken for values of t between 0.15 and

OBSERVED BEHAVIOR OF HIGHLY INELASTIC ELECTRON-PROTON SCATTERING

High intensities pose new problems in the design of transport systems. Induced radioactivity, radiation damage to materials, radiation induced chemical reactions, and heating problems are discussed. Proposed solutions to these problems for the Stanford Linear Accelerator transport systems in the beam switchyard are outlined.