Abstract
The high precision HERA combined measurement of inclusive deep inelastic cross sections in neutral and charged current $ep$ scattering, corresponding to a luminosity of about 1 fb${}^{{}-1}$, permits searches for contributions to electron-quark scattering beyond the Standard Model up to TeV scales. A approach to beyond the Standard Model analysis of the inclusive $ep$ data is presented; simulataneous fits of parton distribution functions and contributions of new physics processes were performed. Results are presented considering a finite radius 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.
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