Search for exclusive photoproduction of Zc± (3900) at COMPASS
C. Adolph (Universität Erlangen–Nürnberg, Physikalisches Institut, Erlangen, 91054, Germany); R. Akhunzyanov (Joint Institute for Nuclear Research, Dubna, Moscow Region, 141980, Russia); M.G. Alexeev (University of Turin, Department of Physics, Turin, 10125, Italy); G.D. Alexeev (Joint Institute for Nuclear Research, Dubna, Moscow Region, 141980, Russia); A. Amoroso (University of Turin, Department of Physics, Turin, 10125, Italy, Torino Section of INFN, Turin, 10125, Italy); et al - Show all 209 authors
A search for the exclusive production of the Zc±(3900) hadron by virtual photons has been performed in the channel Zc±(3900)→J/ψπ± . The data cover the range from 7 GeV to 19 GeV in the centre-of-mass energy of the photon–nucleon system. The full set of the COMPASS data set collected with a muon beam between 2002 and 2011 has been used. An upper limit for the ratio BR(Zc±(3900)→J/ψπ±)×σγN→Zc±(3900)N/σγN→J/ψN of 3.7×10−3 has been established at the confidence level of 90%.