Search for a narrow baryonic state decaying to pKS0 and p‾KS0 in deep inelastic scattering at HERA

Halina Abramowicz, I. Abt,Leszek Adamczyk,M. Adamus, S. Antonelli,V. Aushev,Olaf Behnke,Ulf Behrens, A. Bertolin, S. Bhadra,Ingo Bloch, E.G. Boos,Ian Brock,N. H. Brook, R. Brugnera,A. Bruni,Peter Bussey,Allen Caldwell,Marcella Capua, C.D. Catterall,Janusz Chwastowski,J. Ciborowski,R. Ciesielski,A. M. Cooper-Sarkar,M. Corradi, R. K. Dementiev, R.C.E. Devenish,S. Dusini,B. Foster, Grzegorz Gach, E. Gallo, A. Garfagnini,Achim Geiser,Andrii Gizhko,L. K. Gladilin,Yu. A. Golubkov,G. Grzelak,Marcin Pawel Guzik,Claire Gwenlan, W. Hain,O. Hlushchenko,D. Hochman,R. Hori,Zainol Abidin Ibrahim, Y. Iga,Masaki Ishitsuka, F. Januschek, N. Z. Jomhari,I. Kadenko,S. Kananov, U. Karshon,P. Kaur,Danuta Kisielewska,R. Klanner, U. Klein, I. A. Korzhavina, A. Kotański,U. Kötz, N. Kovalchuk,H. Kowalski, B. Krupa, O. Kuprash,M. Kuze,B. B. Levchenko,Aharon Levy,S. Limentani,M. Lisovyi,E. Lobodzinska, B. Löhr, E. Lohrmann,A. Longhin, D. Lontkovskyi,O. Yu. Lukina,I. Makarenko,J. Malka,Anna Mastroberardino,F. Mohamad Idris,N. Mohammad Nasir,V. Myronenko, K. Nagano,Takuya Nobe, R. J. Nowak,Yu. Onishchuk,E. Paul, W. Perlanski,N.S. Pokrovskiy, A. Polini,Mariusz Przybycien, P. Roloff, M. Ruspa,D.H. Saxon,Marco Schioppa,U. Schneekloth,Thomas Schörner-Sadenius,L. M. Shcheglova,R. Shevchenko,O. Shkola,Yu.O. Shyrma,I. Singh, I.O. Skillicorn

Proceedings of XXIV International Workshop on Deep-Inelastic Scattering and Related Subjects — PoS(DIS2016)（2016）

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摘要

Abstract A search for a narrow baryonic state in the p K S 0 and p ‾ K S 0 system has been performed in ep collisions at HERA with the ZEUS detector using an integrated luminosity of 358 pb − 1 taken in 2003–2007. The search was performed with deep inelastic scattering events at an ep centre-of-mass energy of 318 GeV for exchanged photon virtuality, Q 2 , between 20 and 100 GeV 2 . Contrary to evidence presented for such a state around 1.52 GeV in a previous ZEUS analysis using a sample of 121 pb − 1 taken in 1996–2000, no resonance peak was found in the p ( p ‾ ) K S 0 invariant-mass distribution in the range 1.45–1.7 GeV. Upper limits on the production cross section are set.

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