Editing HERA (particle accelerator) (section)

== HERA experiments ==

=== H1 ===
{{main|H1 (particle detector)}}
H1 was a universal detector for the collision of electrons and protons, located in the HERA Hall North. It measured 12&nbsp;m × 10&nbsp;m × 15&nbsp;m, weighed 2800 tons and was operated from 1992 to 2007. It was designed for probing the inner structure of the proton, the exploration of the strong interaction as well as the search for new kinds of matter and unexpected phenomena in particle physics.<ref name="HERA-point">{{cite web |title= HERA pointing the way |url= https://pr.desy.de/sites/sites_desygroups/sites_extern/site_pr/content/e104098/e104111/HERA_Pointing_the_way_eng.pdf#page=11 |publisher= DESY |access-date=4 May 2023}}</ref>

==== ZEUS ====
{{main|ZEUS}}
Like H1, ZEUS was a detector for electron–proton collisions, located in the HERA Hall South. It measured 12&nbsp;m × 11&nbsp;m × 20&nbsp;m, weighed 3600 tons and was operated from 1992 to 2007. Its tasks were similar to those of H1.<ref name="HERA-point" />

==== HERA-B ====
{{main|HERA-B}}
HERA-B was an experiment in the HERA Hall West, which collected data from 1999 to February 2003. By using HERA's proton beam, researchers at HERA-B conducted experiments on heavy quarks. The detector measured 8&nbsp;m × 20&nbsp;m × 9&nbsp;m and weighed 1000 tons.<ref name="HERA-point" />

==== HERMES ====
{{main|HERMES experiment}}
The HERMES experiment in the HERA Hall East was operated from 1995 to 2007. HERA's longitudinally polarised electron beam was used to explore the [[Nucleon spin structure|spin structure of nucleons]]. For this purpose, the electrons were scattered at energies of 27.5&nbsp;GeV at an internal gas target. This target and the detector itself were designed especially with a view to spin-polarised physics. The detector measured 3.5&nbsp;m × 8&nbsp;m × 5&nbsp;m and weighed 400 tons.<ref name="HERA-point" />