Indication for ${\pi }^{+}{\pi }^{-}$ scattering in $p+p$ collisions at $\sqrt{s_{{}_{NN}}}=$200 GeV

Abstract

A $\rho (770{)}^0$ mass shift of about -40 MeV/$c^2$ was measured in $p+p$ collisions at $\sqrt{s_{{}_{NN}}}=$ 200 GeV at RHIC. Previous mass shifts have been observed at CERN-LEBC-EHS and CERN-LEP. We will show that phase space does not account for the $\rho (770{)}^0$ mass shift measured at RHIC, CERN-LEBC-EHS and CERN-LEP and conclude that there are significant scattering interactions in $p+p$ collisions.

arXiv comment11 pages and 7 figures

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• Delta mass shift as a thermometer of kinetic decoupling in Au+Au reactions at 1.23 AGeV
• The Wendelstein Calar Alto Pixellensing Project (WeCAPP): the M31 Nova catalogue