Search for a narrow baryonic state decaying to {pK⁰_S} and {bar{p}K⁰_S} in deep inelastic scattering at HERA

ZEUS Collaboration: H. Abramowicz , I. Abt , L. Adamczyk , M. Adamus , S. Antonelli , V. Aushev , O. Behnke , U. Behrens

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

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classification ✦ hep-ex hep-ph

keywords searchstatebaryonicdeepherainelasticnarrowperformed

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A search for a narrow baryonic state in the $pK^0_S$ and $\bar{p}K^0_S$ 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 $\rm{} GeV^{2}$. 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 $p(\bar{p})K^0_S$ invariant-mass distribution in the range 1.45-1.7 GeV. Upper limits on the production cross section are set.

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Search for a narrow baryonic state decaying to {pK⁰_S} and {bar{p}K⁰_S} in deep inelastic scattering at HERA

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