Tensor A yy and vector A y analyzing powers in the 1H(d, d′)X and 12C(d, d′)X reactions at initial deuteron momenta of 9 GeV/c in the region of baryonic resonance excitation

Abstract

arXiv:nucl-ex/0510050v1 17 Oct 2005Tensor A yy and vector A y analyzing powers in the H(d, d′ )X and 12 C(d, d ′ )X reactons at initial deuteron momenta of 9 GeV/c in the region of baryonic resonances excitation. The angular dependence of the tensor Ayy and vector Ay analyzing powers in the inelastic scattering of deuterons with a momentum of 9.0 GeV/c on hydrogen and carbon have been measured. The range of measurements corresponds to the baryonic resonance excitation with masses ∼2.2-2.6 GeV/c 2 . The Ayy data being in good agreement with the previous results demonstrate an approximate t scaling up to -1.5 (GeV/c) 2 . The large values of Ay show a significant role of the spin-dependent part of the elementary amplitude of the N N → N N * reaction. The results of the experiment are compared with model predictions of the plane-wave impulse approximation.

Analytical forms of the deuteron wave function for Nijmegen group potentials and polarization characteristics of A(d,d′)X reactions

“…It should be noted that the results of calculations of the analyzing powers of A yy and A y as in papers [17,23] for the Paris and Bonn potentials, and in this paper for Nijmegen group potentials, strongly differ from the experimental data within |t|=0-1.0 (GeV/c) 2 . In addition, there is a certain scatter of data of experimental points for close measurements.…”

“…The angular dependence of analyzing powers in the inelastic scattering of deuterons with a momentum of 9.0 GeV/c on hydrogen and carbon has been measured in paper [23]. The measurement range corresponds to a baryonic resonance excitation with a mass of 2.2-2.6 GeV/c 2 .…”

“…The results of numerical calculations are shown in Figures 1-4, where t-scaling according to the elementary record is used according to the formula t=-(0.197326p) 2 given units for momentum p in [fm −1 ] and t-scaling in [(GeV/c) 2 ]. The theoretical estimates of the A yy and A y values are compared with the experimental data for the reaction of (d,d') type on light nuclei: on hydrogen [23], carbon [23,28,29], beryllium [21,22,25]. Based on the data [29], the tensor analyzing power is determined by the formula: A yy = −T 20 / √ 2.…”

“…Papers [17,23] provide the results of calculations of the analyzing powers obtained by DWF for the Paris and three (A, B, C) versions of the Bonn potentials. There, for a=0.4, the value A yy intersects zero in the region |t|=1.0-1.2 (GeV/c) 2 , and the vector capacity A y calculated for the Paris potential better correlates with the experimental data than for the Bonn potential (a=0.3-0.4), and to |t|=1.0 (GeV/c) 2 is determined by the spin-dependent part of the amplitude of the elementary process NN→NN*(2190).…”

“…In paper [23] the obtained experimental data of analyzing powers have been analyzed and it has been stated that data for values A yy at |t| ≤0.8 (GeV/c) 2 differ from PWIA [17] calculations for standard DWFs and from the data received in dp-and ed-elastic scatterings, that is, such behavior and difference indicates to the sensitivity of A yy to baryonic resonance excitation through double-collision interactions.…”