New measurements of the <math><msub><mrow><mi>T</mi></mrow><mrow><mn>20</mn></mrow></msub></math> component of tensor analyzing power in the reaction <math><mi>γ</mi><mi>d</mi><mo>→</mo><mi>p</mi><mi>p</mi><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup></math> for photon energies <math><mn>400</mn><mo>−</mo><mn>700</mn></math> MeV are presented. The experiment was carried out on an internal tensor-polarized gas deuterium target of the VEPP-3 electron storage ring in 2023 with the use of tagged quasi-real photons and two-proton coincidence. For determination of <math><msub><mrow><mi>T</mi></mrow><mrow><mn>20</mn></mrow></msub></math>, the asymmetry caused by a change of the sign of the tensor polarization of the deuteron target was measured. The new data are compared with the results of theoretical calculations based on the quasi-free approximation including πN and NN rescattering effects.

Russia

V.V. Gauzshtein

Saudi Arabia

Egypt

E.M. Darwish

A.I. Fix

M.Ya. Kuzin

Belarus

M.I. Levchuk

A.Yu. Loginov

D.M. Nikolenko

I.A. Rachek

Yu.V. Shestakov

D.K. Toporkov

A.V. Yurchenko

B.I. Vasilishin

S.A. Zevakov

G.N. Baranov

A.V. Bogomyagkov

V.M. Borin

D.V. Dorokhova

V.L. Dorokhov

A.N. Zhuravlev

S.E. Karnaev

K.Yu. Karyukina

A.A. Kovalenko

V.N. Kudryavtsev

E.B. Levichev

I.B. Logashenko

T.V. Maltsev

R.Z. Mamutov

I.A. Morozov

I.N. Okunev

P.A. Piminov

L.I. Shekhtman

E.A. Simonov

S.V. Sinyatkin

M.A. Skamarokha

E.V. Starostina

Measurement of the tensor analyzing power For Incoherent Photoproduction on a Deuteron Above the First Resonance Region

The <math><mo>(</mo><mn>2</mn><mo>+</mo><mn>1</mn><mo>)</mo></math>-dimensional Maxwell–Chern–Simons gauge model consisting of two complex scalar fields interacting through a common Abelian gauge field is considered. It is shown that the model has a solution that describes a soliton system consisting of vortex and Q-ball constituents. This two-dimensional soliton system possesses a quantized magnetic flux and a quantized electric charge. Moreover, the soliton system has a nonzero angular momentum. Properties of this vortex-Q-ball system are investigated by analytical and numerical methods. It is found that the system combines properties of a vortex and a Q-ball.

A two-dimensional soliton system in the Maxwell–Chern–Simons gauge model