The H1 experiment is an international collaboration performing fundamental research in the field of Deep Inelastic Scattering, i.e. probing the internal structure of the proton at a scale some 1/10000 of its diameter. The accelerator which provides these beams, HERA, is one of the facilities at the German national laboratory for elementary particle Physics DESY (Deutsches Elektronen-Synchrotron) in Hamburg. The HERA collider ceased its 15 year operation in June 2007. Analysis of this data is ongoing.
The main interest of research of the H1 collaboration is to measure the structure of the proton, to study the theory of strong interactions (QCD), and to search for physics beyond the Standard Model.
The Queen Mary Group are deeply involved in the study of fragmentation (i.e. the process of how quarks and gluons form hadrons). Inclusive charged particle spectra are studied in the Breit frame of reference which is particularly suitable for isolating the results of the collision of an exchanged vector boson with the final scattered quark and enables easy comparisons with one hemisphere of an e+e- annihilation event.
QM are also involved in the measurement of inclusive cross sections in both the Neutral Current and Charged Current channels. These data at high Q2 provide information about the quark and gluon content of the proton, and their dynamics. These measurements are used to extract these parton densities. We are also involved in the combination of H1 data with ZEUS data to achieve improved systematic precision through a cross calibration of both experiments.