Search for a narrow baryonic state decaying to pKS0 and \bar{p}KS0 in deep inelastic scattering with the HERA II data

Apr 12, 2016, 3:13 PM
SR1 (DESY Hamburg)


DESY Hamburg

QCD and Hadronic Final States WG2 QCD and Hadronic Final States


Mr Ryuma Hori (KEK)


A search for a narrow baryonic state in the pKS0 and \bar{p}KS0 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 (DIS) events at an ep centre-of-mass energy of 318 GeV for exchanged photon virtuality, Q2, 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 1995–2000, no resonance peak is found in the p(\bar{p})KS0 invariant-mass distribution in the range 1.45–1.7 GeV. Upper limits on the production cross section are set for different assumptions on the width of the resonance.

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