Measurement of the Tensor Analyzing PowersT20andT21in Elastic Electron-Deuteron Scattering

Abstract

The tensor analyzing power components T20 and T21 have been measured in elastic electron-deuteron scattering at the 2 GeV electron storage ring VEPP-3, Novosibirsk, in a four-momentum transfer range from 8.4 to 21.6 fm(-2). A new polarized internal gas target with an intense cryogenic atomic beam source was used. The new data determine the deuteron form factors G(C) and G(Q) in an important range of momentum transfer where the first node of the deuteron monopole charge form factor is located. The new results are compared with previous data and with some theoretical predictions.

Electromagnetic structure of few-nucleon ground states

“…[38,34,30,43,46,40,47,35,29,28], and for T 20 (Q) to Refs. [51,52,49,53,54,59,55,56,57,60,58]. Note that Refs.…”

Precise Measurement of Deuteron Tensor Analyzing Powers with BLAST

“…Results for T 20 and T 21 [grey (red online) dots] compared to previous data [4] (open dots), [5,6] (open upright triangles), [7] (solid upright triangles), [8] (solid dots), [9] (open squares), [10] (solid squares), [11] (open stars), [12] (solid down triangles), and various theoretical predictions. The theoretical curves are nonrelativistic models with relativistic corrections [13] (long dashed line), [14] (dashed line), relativistic models [15] (dash-dotted line), [16] (dotted line), and effective field theory [17,18] (grey error band).…”

“…During the last two decades, measurements of tensor-polarized observables, made possible by innovative accelerator and target technologies, have provided new experimental information to understand the electromagnetic structure of the deuteron [4][5][6][7][8][9][10][11][12] and put strong constraints on nuclear models, e.g., Hamiltonian dynamics [13,14], explicitly covariant models [15,16], as well as the latest developments in effective field theory for low-Q physics [17,18]. In this Letter, a highprecision measurement of the deuteron tensor analyzing powers T 20 and T 21 over a broad range of low-momentum transfer is reported.…”

“…Tensor-polarized observables can be measured as tensor moments of recoiling deuterons with unpolarized beam and target [4,8,11] or as tensor asymmetries with a tensor-polarized target [5][6][7]9,10,12]. The experiment reported in this Letter used a highly polarized deuterium gas target with a large acceptance magnetic spectrometer, which is different from all previous experiments.…”

“…[12] and of the present Letter included, and all 18 parameters, including the location of the first nodes of all three form factors, were allowed to vary. The fit confirms the location of the first node of G C at 4:19 AE 0:05 fm À1 , consistent with previous findings [12,26].…”