# ICHEP 2016 Chicago

3-10 August 2016
Chicago IL USA
US/Central timezone
There is a live webcast for this event.

## Limits on the effective quark radius from inclusive ep scattering & contact interactions at HERA (15' + 5')

5 Aug 2016, 16:10
20m
Chicago 7

### Chicago 7

Oral Presentation Beyond the Standard Model

### Speaker

Aleksander Filip Zarnecki (University of Warsaw)

### Description

The high--precision HERA data allows searches up to TeV scales for Beyond the Standard Model contributions to electron--quark scattering. Combined H1 and ZEUS measurements of the 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 together with 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, or resulting from the 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 and the limits on the CI mass scales, for different CI scenarios extend up to the 10 TeV scale.

### Primary authors

Aleksander Filip Zarnecki (University of Warsaw) Matthew Wing (UCL)