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The high-precision HERA data allows searches up to TeV scales for Beyond theStandard Model contributions to electron-quark scattering. Combinedmeasurements of the inclusive deep inelastic cross sections in neutral andcharged current $ep$ scattering corresponding to a luminosity of around 1fb$^{-1}$ have been used in this analysis. A new approach to the beyond theStandard Model analysis of the inclusive $ep$ data is presented; simultaneousfits of parton distribution functions together with contributions of "newphysics" processes were performed. Results are presented considering a finiteradius of quarks within the quark form-factor model. The resulting 95% C.L.upper limit on the effective quark radius is $0.43\cdot 10^{-16}$ cm.

Limits on the effective quark radius from inclusive $ep$ scattering at HERA