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

L. N. Strunov; V. G. Antonenko; S. B. Borzakov; Yu. T. Borzunov; E. V. Chernykh; V. F. Chumakov; Yu. I. Ivanshin; S. A. Dolgii; M. Finger; M. Finger; L.B. Golovanov; D. K. Guriev; A. Janata; A. D. Kovalenko; V. A. Krasnov; N. A. Kuzmin; A. N. Livanov; P. K. Maniakov; E. A. Matyushevsky; A.A Morozov; G. P. Nikolaevsky; A. A. Nomofilov; Tz. Panteleev; I. L. Pisarev; Yu. P. Polunin; A. N. Prokofiev; V. Yu. Prytkov; P. A. Rukoyatkin; V. I. Sharov; R. A. Shindin; M. Slunečka; V. Slunečková; A. Yu. Starikov; T. A. Vasiliev; I. P. Yudin; I. V. Zaitsev; A. A. Zhdanov; V. N. Zhmyrov

doi:10.1140/epjst/e2008-00784-9

EPJ

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

L. N. Strunov¹, V. G. Antonenko², S. B. Borzakov³, Yu. T. Borzunov¹, E. V. Chernykh¹, V. F. Chumakov¹, Yu. I. Ivanshin⁴, S. A. Dolgii¹, M. Finger Jr.⁵^,6, M. Finger⁵^,6, L.B. Golovanov¹, D. K. Guriev¹, A. Janata⁵, A. D. Kovalenko¹, V. A. Krasnov¹^,7, N. A. Kuzmin⁴, A. N. Livanov¹^,7, P. K. Maniakov¹, E. A. Matyushevsky¹, A.A Morozov¹, G. P. Nikolaevsky¹, A. A. Nomofilov¹, Tz. Panteleev³^,8, I. L. Pisarev⁵, Yu. P. Polunin², A. N. Prokofiev⁹, V. Yu. Prytkov¹, P. A. Rukoyatkin¹, V. I. Sharov¹, R. A. Shindin¹, M. Slunečka⁵^,6, V. Slunečková⁵^,6, A. Yu. Starikov¹, T. A. Vasiliev¹, I. P. Yudin⁴, I. V. Zaitsev¹, A. A. Zhdanov⁹ and V. N. Zhmyrov¹

¹ JINR, Veksler and Baldin Laboratory of High Energies, 141980 Dubna, Russia
² Russian Scientific Center “Kurchatov Institute", 123182 Moscow, Russia
³ JINR, Frank Laboratory of Neutron Physics, 141980 Dubna, Russia
⁴ JINR, Laboratory of Particle Physics, 141980 Dubna, Russia
⁵ JINR, Dzhelepov Laboratory of Nuclear Problems, 141980 Dubna, Russia
⁶ Charles University, Faculty of Mathematics and Physics, V Holešovičkách 2, 180 00 Praha 8, Czech Republic
⁷ Institute for Nuclear Research, Russian Academy of Sciences, 117312 Moscow, Russia
⁸ Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, Tsarigradsko shaussee boulevard 72, 1784 Sofia, Bulgaria
⁹ St. Petersburg Nuclear Physics Institute, High Energy Physics Division, 188350 Gatchina, Russia

Abstract

The measurements of np-spin observables at $0^\circ$ 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 $\Delta\sigma_{\rm L}(np)$ spin differences and the study of the $np\to pn$ elastic charge-exchange process. In the $\Delta\sigma_{\rm L}(np)$ and $-\Delta\sigma_{\rm L}({\rm I}=0)$ energy dependencies over the energy region T $_{\rm kin}=1.2$ –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 $NN\!\to 6q$ 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 T $_{\rm kin}=1.8$ GeV and at the higher energies using the Argand diagrams method.

15th European Conference on Atoms Molecules and Photons (ECAMP)
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EPJ

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

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