SPIN OBSERVABLES OF pd ELASTIC SCATTERING AT 20 – 50 GeV/c WITHIN THE GLAUBER MODEL AND pN AMPLITUDES

Oct 17, 2020, 10:15 AM
25m
Online

Online

Oral report Section 4. Relativistic nuclear physics, elementary particle physics and high-energy physics. Section 4. Relativistic nuclear physics, elementary particle physics and high-energy physics

Speaker

Yuriy Uzikov (JINR)

Description

Spin amplitudes of pp- and pn elastic scattering contain important information on the dynamics of the NN interaction. Systematic information on these amplitudes is accumulated in the SAID data base [1] and available up to kinetic energy 3 GeV for pp and 1.2 GeV for pn scattering. At higher energies there are only non-complete data on pp scattering, whereas information about the pn amplitudes is very poor. In the literature there are some parametrizations for pN amplitudes obtained in the eikonal model [2] and within the Regge phenomenology for 3 - 50 GeV/c [3]. A possible way to check the existing parametrizations is to study spin effects in proton-deuteron (pd) and neutron-deuteron (nd) elastic and quasi-elastic scattering. At high energies and small four-momentum transfer $t$ pd scattering can be described by the Glauber diffraction theory of multistep scattering, which involves as input on-shell pN elastic scattering amplitudes. Application of this theory with spin-dependent effects included [4] demonstrates a good agreement with the pd scattering data at energies about 1 GeV if the SAID data on pN scattering amplitudes are involved into calculations [4,5].
Here we apply the spin-dependent Glauber theory [4] to calculate spin observables of pd elastic scattering at 20 - 50 GeV/c using available pp elastic scattering amplitudes $f_{pp}$ parametrized in Ref. [3] within the Regge formalism. As a first approximation, for pn elastic scattering we use pp amplitudes from [3]. We should note that the Regge formalism allows one to construct pn- (and antiproton N) amplitudes together with the pp amplitudes. However, in view of scare experimental information about the spin dependent pn amplitudes, and taking into account that the spin-independent parts of the pp- and pn amplitude at high energies are approximately the same, we put here $f_{pn}=f_{pp}$. The calculated vector ($A_y^p$, $A_y^d$) and tensor ($A_{xx}$, $A_{yy}$, $A_{xz}$) analysing powers and the spin-correlation coefficients like $C_{y,y}$, $C_{y,yy}$, $C_{x,x}$ can be measured at SPD NICA [6] that will provide a serious test of the used pN amplitudes.

  1. R.A.Arndt et al., Phys. Rev. C 76 (2007) 025209.
  2. S.Wakaizumi, M.Sawamoto, Prog. Theor. Phys. 64 (1980) 1699.
  3. A.Sibirtsev et al., Eur. Phys. J. A 45(2010) 357.
  4. M.N.Platonova, V.I.Kukulin, Phys.Rev.C 81 (2010) 014004; Eur.Phys.J. A56 (2019) 132.
  5. A.A.Temerbayev, Yu.N.Uzikov, Yad. Fiz. 78 (2015) 38.
  6. I.Savin et.al., EPJ Web Conf. 85 (2015) 02039.

Primary authors

Yuriy Uzikov (JINR) Johann Haidenbauer (IAS, Forschungszentrum J\"ulich GmbH ) Azamat Temerbayev (Eurasian national university) Albina Bazarova (L.N. GUMILYOV EURASIAN NATIONAL UNIVERSITY)

Presentation materials