Search for Baryonic Resonances Decaying to Xi pi in DeepInelastic Scattering at HERA.pdf

DESY 07-045 ISSN 0418-9833 April 2007 Search for Baryonic Resonances Decaying to Ξπ 7 0 in Deep-Inelastic Scattering at HERA 0 2 r p A 6 2 H1 Collaboration ] x e - p e h [ 1 v Abstract 4 9 5 A search for narrow baryonic resonances decaying into Ξ−π− or Ξ−π+ and their antipar- 3 . ticles is carried out with the H1 detector using deep inelastic scattering events at HERA in 4 2 2 0 the range of negative photon four-momentum transfer squared 2 Q 100 GeV . No 7 signal is observed for a new baryonic state in the mass range 1600 − 2300 MeV in either 0 the doubly charged or the neutral decay channels. The known baryon Ξ(1530)0 is observed : v through its decay mode into Ξ−π+ . Upper limits are given on the ratio of the production i rates of new baryonic states, such as the hypothetical pentaquark states Ξ−− or Ξ0 , relative X 5q 5q r to the Ξ(1530)0 baryon state. a To be submitted to Phys. Lett. B 10 10,49 24 4 25 10 A. Aktas , C. Alexa , V. Andreev , T. Anthonis , B. Antunovic , S. Aplin , 32 4 29 37 24 A. Asmone , A. Astvatsatourov , S. Backovic , A. Baghdasaryan , P. Baranov , E. Barrelet28 , W. Bartel10, S. Baudrand26 , M. Beckingham10, K. Begzsuren34 , O. Behnke13, 7 2