George I. Smirnov

Parton Distributions in the Lightest Nuclei

The studies of nuclear effects in structure functions performed until now, did not include nuclear targets with A < 4. Therefore one had to deal with the evolution of the typical oscillation of the ratio F2A/ F2D as a function of x from A = 4 until A = 200 and not with the origin of the oscillation itself. The oscillation obviously sets on already for the lightest nuclei, like 3He, and remains 'frozen' for heavier nuclei because of the saturation of short range nuclear forces. This has been demonstrated in Refs. (1-3), (5). The analysis of the position of the three cross-over points in which F2A/ F2D = 1 shows, that they are A-independent if A > 3:

       1st: x = 0.0615 ± 0.0024

       2nd: x = 0.278  ± 0.008
 
       3d : x = 0.84 ± 0.01

The Letter of Intent, which will suggest measurements of the distortion of parton distributions in 3-nucleon systems is being discussed these days. The motivation is based on the calculations of the evolution of the EMC effect in light nuclei, performed recently by V.Burov, A.Molochkov and G.Smirnov.

April 10, 2007

REFERENCES:

  1. V.V. Burov, A.V. Molochkov, G.I. Smirnov and H. Toki,
    RELATING F2p(x), F2n(x) and F2D(x) STRUCTURE FUNCTIONS in the COVARIANT BETHE-SALPETER FORMALISM.
    Nucl. Phys. A 755 (Proc. Suppl.) (2005) 337-340.
  2. V.V. Burov, A.V. Molochkov, G.I.Smirnov and H.Toki,
    RELATING THE PROTON, NEUTRON and DEUTERON STRUCTURE FUNCTIONS IN THE COVARIANT BETHE-SALPETER FORMALISM,
    Physics Letters B 587 (2004) 175
  3. S.G. Bondarenko, V.V. Burov, A.V. Molochkov, G.I. Smirnov and H. Toki
    BETHE-SALPETER APPROACH with the SEPARABLE INTERACTION for the DEUTERON.
    Prog. Part. Nucl. Phys., Vol. 48 (2002) pp. 449 -- 535.
  4. G.I. Smirnov, DETERMINATION of the PATTERN of NUCLEAR BINDING from the DATA on LEPTON-NUCLEUS DEEP INELASTIC SCATTERING.
    Eur. Phys. J. C. 10, 1999, pp. 239-247.
    hep-ph/9901422.
  5. G.I. Smirnov, QUARKS IN NUCLEAR MATTER. Proc. of the VIth Rencontre de Blois,
    "The Heart of the Matter", June 20-25, 1994, Edited by J. Tran Than Van and J.F. Mathiot, pp. 265-276.
  6. G.I. Smirnov, A STUDY OF THE A DEPENDENCE OF THE DEEP INELASTIC SCATTERING OF LEPTONS AND ITS IMPLICATIONS FOR UNDERSTANDING OF THE EMC EFFECT.
    Phys. At. Nucl. 58 (1995) 1613-1618 ( Yadernaya Fizika, vol. 58 (1995) No. 9, pp. 1712 - 1717).
  7. G.I. Smirnov, ON THE UNIVERSALITY OF THE x AND A DEPENDENCE OF THE EMC EFFECT AND ITS RELATION TO PARTON DISTRIBUTIONS IN NUCLEI,
    Physics Letters, B364 (1995) pp. 87-92.
  8. G.I. Smirnov, ON THE SIMILARITY OF THE PARTON DISTRIBUTIONS IN NUCLEI WITH MORE THAN THREE NUCLEONS.
    HEP-PH 9611203 (July 1996) 7p.
  9. G.I.Smirnov, Report at the HD'97 WORKSHOP on "Soft and Hard Interactions in Deep Inelastic Scattering", Heidelberg 1997.
  10. I.A. Savin, G.I. Smirnov, THE EFFECT OF NUCLEAR MEDIUM ON THE STRUCTURE OF THE BOUND NUCLEONS. (IN RUSSIAN).
    Fiz. Elem. Chastits At. Yadra 22 (1991) 1005-1066.
  11. R. Lednicky, D.V. Peshekhonov, G.I. Smirnov, ESTIMATION OF THE EMC EFFECT VALUE IN THE DEUTERON.
    Sov.J.Nucl.Phys.52:552-553,1990.
See also LPP home page
E-mail: george.smirnov@cern.ch

Back to Smirnov G. I. home page