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Search for the NN → 6q phase transition in the np-polarized measurements at T kin = 1–6 GeV

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Abstract

The measurements of np-spin observables at 0° have been performed for the first time on the Delta-Sigma experimental facility of LHE JINR up to P n = 4.5 GeV/c using the monochromatic neutron beam. They include detailed measurements of the Δσ L(np) spin differences and the study of the np → pn elastic charge-exchange process. In the Δσ L(np) and −Δσ L(I = 0) energy dependencies over the energy region Tkin = 1.2–3.7 GeV the peculiarity at 1.8 GeV was observed. Such energy behavior was predicted by the QCD approach as a signal of the NN → 6q phase transition. For the exhaustive investigation of this effect it is necessary to measure the energy dependence of the complete set of np observables with both longitudinal (L) and transverse (T) polarizations of the neutron beam and proton target. This will allow Direct Reconstruction of all three NN forward Scattering Amplitudes (DRSA) to be performed, and the observed peculiarity to be checked around Tkin = 1.8 GeV and at the higher energies using the Argand diagrams method.

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Authors and Affiliations

  1. Veksler and Baldin Laboratory of High Energies, JINR, 141980, Dubna, Russia

    L. N. Strunov, Yu. T. Borzunov, E. V. Chernykh, V. F. Chumakov, S. A. Dolgii, L. B. Golovanov, D. K. Guriev, A. D. Kovalenko, V. A. Krasnov, A. N. Livanov, P. K. Maniakov, E. A. Matyushevsky, A. A. Morozov, G. P. Nikolaevsky, A. A. Nomofilov, V. Yu. Prytkov, P. A. Rukoyatkin, V. I. Sharov, R. A. Shindin, A. Yu. Starikov, T. A. Vasiliev, I. V. Zaitsev & V. N. Zhmyrov

  2. Russian Scientific Center “Kurchatov Institute”, 123182, Moscow, Russia

    V. G. Antonenko & Yu. P. Polunin

  3. Frank Laboratory of Neutron Physics, JINR, 141980, Dubna, Russia

    S. B. Borzakov & Tz. Panteleev

  4. Laboratory of Particle Physics, JINR, 141980, Dubna, Russia

    Yu. I. Ivanshin, N. A. Kuzmin & I. P. Yudin

  5. Dzhelepov Laboratory of Nuclear Problems, JINR, 141980, Dubna, Russia

    M. Finger Jr., M. Finger, A. Janata, I. L. Pisarev, M. Slunečka & V. Slunečková

  6. Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 180 00, Praha 8, Czech Republic

    M. Finger Jr., M. Finger, M. Slunečka & V. Slunečková

  7. Institute for Nuclear Research, Russian Academy of Sciences, 117312, Moscow, Russia

    V. A. Krasnov & A. N. Livanov

  8. Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, Tsarigradsko shaussee boulevard 72, 1784, Sofia, Bulgaria

    Tz. Panteleev

  9. St. Petersburg Nuclear Physics Institute, High Energy Physics Division, 188350, Gatchina, Russia

    A. N. Prokofiev & A. A. Zhdanov

Authors
  1. L. N. Strunov
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  2. V. G. Antonenko
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  3. S. B. Borzakov
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  4. Yu. T. Borzunov
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  5. E. V. Chernykh
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  6. V. F. Chumakov
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  7. Yu. I. Ivanshin
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  8. S. A. Dolgii
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  9. M. Finger Jr.
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  10. M. Finger
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  11. L. B. Golovanov
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  13. A. Janata
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  15. V. A. Krasnov
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  16. N. A. Kuzmin
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  17. A. N. Livanov
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  18. P. K. Maniakov
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  19. E. A. Matyushevsky
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  20. A. A. Morozov
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  21. G. P. Nikolaevsky
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  22. A. A. Nomofilov
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  24. I. L. Pisarev
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  25. Yu. P. Polunin
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  26. A. N. Prokofiev
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  27. V. Yu. Prytkov
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  28. P. A. Rukoyatkin
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  29. V. I. Sharov
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  30. R. A. Shindin
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  31. M. Slunečka
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  32. V. Slunečková
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  33. A. Yu. Starikov
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  34. T. A. Vasiliev
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  35. I. P. Yudin
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  36. I. V. Zaitsev
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  37. A. A. Zhdanov
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  38. V. N. Zhmyrov
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Corresponding author

Correspondence to L. N. Strunov.

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Strunov, L.N., Antonenko, V.G., Borzakov, S.B. et al. Search for the NN → 6q phase transition in the np-polarized measurements at T kin = 1–6 GeV. Eur. Phys. J. Spec. Top. 162, 125–132 (2008). https://doi.org/10.1140/epjst/e2008-00784-9

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  • DOI: https://doi.org/10.1140/epjst/e2008-00784-9

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