Exploring Ultraperipheral Heavy Ion Collisions in CMS Run III
DOI:
https://doi.org/10.15407/ujpe69.11.815Keywords:
UPC, heavy ion, RUN3, nuclear breakdownAbstract
Ultraperipheral collisions (UPCs) of heavy ions are a useful probe to study nuclear parton distribution functions (nPDFs) and, in particular, to characterize nuclear matter at Bjorken x < 10−3 and low squared momentum transfer Q2 (shadowing/saturation regime). In order to fully exploit these collisions, dedicated triggers on such event topologies were developed for the heavy ion data-taking period in 2023 by the CMS experiment. These triggers relied on the possibility of using the Zero Degree Calorimeter (ZDC) as a level-1 (L1) trigger detector for the first time. As a result, they allowed for an improved selection performance in addition to existing UPC triggers (as well as minimum-bias hadronic triggers), and enabled the study of hard processes (jets and heavy flavor hadrons) in photon-photon (γγ) and photon-nucleus (γN) scatterings [1].
References
S.R. Klein, P. Steinberg. Photonuclear and two-photon interactions at high-energy nuclear colliders. Ann. Rev. Nucl. Part. Sci. 70, 323 (2020).
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