EPS-HEP 2017

Polarization effects in the reactions p+3He→π++4He, π++4He→p+3He and quantum character of spin correlations in the final (p,3He) system

Not scheduled

15m

Salone Adriatico (Palazzo del Casinò)

Board: QH-16

Poster Presentation QCD and Hadronic Physics Poster session

Speaker

Dr Valery Lyuboshitz (Joint Institute for Nuclear Research, Dubna )

Description

The general consequences of $T$ invariance for the direct
and inverse binary reactions $a+b\to c+d$ ,
$c+d\to a+b$ with spin-1/2 particles $a$, $b$
and unpolarized particles $c$, $d$ are analyzed.
Using the formalism of helicity amplitudes, the theoretical study of polarization
effects in the reaction $p+{}^{3}He\to {\pi }^{+}+{}^{4}He$ and in the inverse process
${\pi }^{+}+{}^{4}He\to p+{}^{3}He$ is performed. It is shown
that in the reaction ${\pi }^{+}+{}^{4}He\to p+{}^{3}He$ the spins of the final proton and ${}^{3}He$ nucleus are strongly correlated. A structural
expression through helicity amplitudes, corresponding to arbitrary emission angles, is obtained for the correlation tensor. It is established that in the reaction ${\pi }^{+}+{}^{4}He\to p+{}^{3}He$ one of the "classical" incoherence inequalities of the Bell type for
diagonal components of the correlation tensor is necessarily violated and, thus, the spin correlations in the final system $(p,{}^{3}He)$ have the strongly pronounced quantum character.

Presentation materials

EPS_HEP_2017_Venice--Valery_Lyuboshitz_3.pdf