Search for exclusive photoproduction of Z${}_c^{\pm }$(3900) at COMPASS

Abstract

A search for the exclusive production of the $Z_c^{\pm }(3900)$ hadron by virtual photons has been performed in the channel $Z_c^{\pm }(3900)\to J/\psi {\pi }^{\pm }$. 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 $BR(Z_c^{\pm }(3900)\to J/\psi {\pi }^{\pm })\times {\sigma }_{\gamma N\to Z_c^{\pm }(3900)N}/{\sigma }_{\gamma N\to J/\psi N}$ of $3.7\times 10^{-3}$ has been established at the confidence level of 90%.

arXiv comment8 pages, 3 figures, 1 table

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