Search for a narrow baryonic state decaying to ${pK^0_S}$ and ${\bar{p}K^0_S}$ in deep inelastic scattering at HERA

H. Abramowicz,R. Brugnera,E. Lohrmann,N. H. Brook, M. Ishitsuka,Amanda Cooper-Sarkar, A. Bruni,I. Abt,A. Kotański,A. Bertolin, U. Behrens,J. Tomaszewska, A. Levy, A. Polini,U. Klein,N. Stefaniuk,G. Grzelak,L. Adamczyk,P. Bussey,P. Kaur, Oleg Kuprash,N. Z. Jomhari,D. Hochman,L. Stanco, D.S. Zotkin,Yu. Shyrma,U. Schneekloth,R. Hori,S. Dusini,E. Lobodzinska,W. Hain,H. Kowalski,C. Gwenlan,T. Tymieniecka,M. Kuze,U. Kötz, A. Mastroberardino,S. Kananov,B.O. Zhautykov,E. Paul,O. Shkola,N. Zakharchuk, A. Garfagnini,R. Klanner,W. Perlanski,J. Ciborowski,Marcin Pawel Guzik,C. D. Catterall,M. Capua, R.J. Nowak, I. Bloch,A. Caldwell,A. Stern,W. Słomiński,B. Krupa,I. Makarenko, B. Löhr,R. C. E. Devenish,T. Tsurugai,Y. Yamazaki,R. Ciesielski, M. Schioppa, I. Singh,U. Karshon,E. Tassi, D. Kisielewska, S. Yamada, Olena Hlushchenko,V. Myronenko,L. M. Shcheglova, M. Ruspa,M. Przybycien, M. Turcato,J. J. Chwastowski,S. Bhadra,O. Turkot, M. Corradi, D. Lontkovskyi,J. Sztuk-Dambietz, A. Solano, O. Zenaiev,P. Roloff, K. Wichmann,P. Stopa,J. Malka,R. Shevchenko,O.Yu. Lukina,Yu. A. Golubkov, M. Wing,M. Lisovyi,I. Kadenko, Nataliia Kovalchuk, I.A. Korzhavina,Yu. Onishchuk,N. Mohammad Nasir, E.G. Boos,D. H. Saxon,B.B. Levchenko,M. Adamus,A. Gizhko, O. Behnke,A. Longhin,L. Zawiejski,K. Nagano, E. Gallo,T. Nobe,Wan Ahmad Tajuddin Wan Abdullah, S. Antonelli,S. Limentani,Z. A. Ibrahim, B. Foster, Grzegorz Gach, R.K. Dementiev,A. F. Żarnecki,N.S. Pokrovskiy, I. Brock, A. Verbytskyi,V. Aushev,Achim Geiser, T. Schörner-Sadenius,Y. Iga, I.O. Skillicorn, L. K. Gladilin,K. Tokushuku,F. Mohamad Idris, F. Januschek

PHYSICS LETTERS B（2016）

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摘要

A search for a narrow baryonic state in the pK(S)(0) and (p) over barK(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 GeV2. 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) over bar )K-S(0) invariant-mass distribution in the range 1.45-1.7 GeV. Upper limits on the production cross section are set. (C) 2016 The Author(s). Published by Elsevier B.V.

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