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Volume 282 - 38th International Conference on High Energy Physics (ICHEP2016) - Beyond the Standard Model
Limits on the effective quark radius from inclusive ep scattering & contact interactions at HERA
A.F. Żarnecki* on behalf of the ZEUS Collaboration
*corresponding author
Full text: pdf
Pre-published on: 2017 February 06
Published on: 2017 April 19
The high--precision HERA data allow searches for up to TeV scales ``Beyond the Standard Model'' contributions to electron--quark scattering. Combined H1 and ZEUS measurements of inclusive deep inelastic cross sections in neutral and charged current ep scattering are considered, corresponding to a luminosity of around 1 fb$^{-1}$. A new approach to the beyond the Standard Model analysis of the inclusive $ep$ data is presented; simultaneous fits of parton distribution functions and contributions of ``new physics'' processes are performed. Considered are possible deviations from the Standard Model due to a finite radius of quarks, described within the quark form-factor model, and due to new electron-quark interactions in the framework of $eeqq$ contact interactions (CI). The resulting 95\% C.L. upper limit on the effective quark radius is $0.43\cdot 10^{-16}$~cm. The limits on the CI mass scale extend up to 10 TeV depending on the CI scenario.
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