Physics Letters B (Jan 2025)

Measurement of the tensor analyzing power T20 for incoherent π− photoproduction on a deuteron above the first resonance region

  • V.V. Gauzshtein,
  • E.M. Darwish,
  • A.I. Fix,
  • M.Ya. Kuzin,
  • 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

Journal volume & issue
Vol. 860
p. 139166

Abstract

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New measurements of the T20 component of tensor analyzing power in the reaction γd→ppπ− for photon energies 400−700 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 T20, 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.

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