Published December 2012 | Version v1
Journal article

Formation of the S = -1 resonance X(2265) in the reaction pp → X+K+ at 2.50 and 2.85 GeV

  • 1. Austrian Academy of Sciences, Stefan Meyer Institute for Subatomic Physics, Vienna (Austria)
  • 2. Technische Universitaet Muenchen, Excellence Cluster Universe, Garching (Germany)
  • 3. INFN, Torino (Italy)
  • 4. Dipartimento di Fisica Generale ''A. Avogadro'', Torino (Italy)
  • 5. RIKEN Nishina Center, Saitama (Japan)
  • 6. University of Tokyo, Department of Physics, Tokyo (Japan)
  • 7. INFN, Trieste (Italy)
  • 8. Laboratoire National Saturne, CEA Saclay (France)
  • 9. Indiana University Cyclotron Facility, Bloomington, Indiana (United States)
  • 10. Universitaet Giessen, II. Physikalisches Institut, Giessen (Germany)
  • 11. Forschungszentrum Rossendorf, Rossendorf (Germany)
  • 12. H. Niewodniczanski Institute of Nuclear Physics, Krakow (Poland)
  • 13. Jagellonian University, M. Smoluchowski Institute of Physics, Krakow (Poland)
  • 14. JINR, Dubna (Russian Federation)
  • 15. Universita del Piemonte Orientale, Torino (Italy)

Description

Analyzing DISTO data of pp → pΛK + at T p = 2.50 and 2.85GeV to populate a previously reported X(2265) -resonance with M x = 2267 MeV/c 2 and Γx = 118 MeV at 2.85GeV, we found that the yield of X(2265) at 2.50GeV is much less than that at 2.85GeV (less than 10%), though it is expected from a kinematical consideration to be produced as much as 33% of that at 2.85GeV. The small population of X(2265) at 2.50GeV is consistent with the very weak production of Γ(1405) at the same incident energy toward its production threshold, thus indicating that Γ(1405) plays an important role as a doorway state for the formation of X(2265). (orig.)

Availability note (English)

Available from: http://dx.doi.org/10.1140/epja/i2012-12183-5

Additional details

Identifiers

Publishing Information

Journal Title
European Physical Journal. A
Journal Volume
48
Journal Issue
12
Journal Page Range
p. 1-5
ISSN
1434-6001