Hyperon Polarization

  • Sandibek B. Nurushev
  • Mikhail F. Runtso
  • Mikhail N. Strikhanov
Part of the Lecture Notes in Physics book series (LNP, volume 859)

Abstract

There are several detailed reviews on hyperon polarization (Pondrom in Phys. Rep. 122:57, 1985, Heller in J. Phys. Colloq. C2:121, 1985, Lach in Fermilab-Conf-94/031, Fermilab, 1994, Panagiotou in Int. J. Mod. Phys. A 5:1197, 1990). These works discussed the dependences of hyperon polarizations on the initial energy, momentum transfer, Feynman parameter, and flavors of initial and final quarks. The above reviews contain the following conclusions:
  • the energy dependence of polarization: it was certainly stated that Λ hyperon polarization is practically independent of the beam energy;

  • the dependence of polarization on p T : Λ hyperon polarization at a fixed Feynman parameter x F increases linearly with p T to p T ≈1 GeV/c and then becomes constant, i.e., exhibits a plateau whose height depends on x F ;

  • the dependence of polarization on x F : polarization increases almost linearly with x F at a fixed momentum transfer p T . The last two statements have been represented by the useful analytical expression (Pondrom in Phys. Rep. 122:57, 1985):
    $$P(x, p_T) = - \bigl(a \cdot x_F + b\cdot x^3_F \bigr) \cdot \bigl[ 1- \exp \bigl( -c \cdot p^2_T \bigr) \bigr]. $$

Keywords

Proton Beam Thick Solid Line Neutral Beam Inclusive Production Spin Transfer 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Moskovski Inzhenerno-Fisitscheski Institute, Moscow, Russia 2013

Authors and Affiliations

  • Sandibek B. Nurushev
    • 1
  • Mikhail F. Runtso
    • 2
  • Mikhail N. Strikhanov
    • 3
  1. 1.Experimental Physics DepartmentInstitute for High-Energy PhysicsProtvinoRussia
  2. 2.Exp. Methods of Nuclear PhysicsNat. Research Nuclear Univ. “MEPhI”MoscowRussia
  3. 3.Nat. Research Nuclear Univ. “MEPhI”MoscowRussia

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