Heavy ion operation from run 2 to HL-LHC

Jowett, John; Versteegen, Reine; Schaumann, Michaela

doi:10.5170/cern-2014-006.167

Cited by 2 publications

(1 citation statement)

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“…The change of the mass/charge ratio caused by these processes leads to secondary beams that can potentially quench the LHC magnets. This problem was only recently mitigated for ATLAS and CMS by directing the secondary beams between magnets, while a special new collimator is required for ALICE [43,44].…”

Section: Average Instantaneous Luminositymentioning

confidence: 99%

New long-lived particle searches in heavy-ion collisions at the LHC

et al. 2020

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We show that heavy ion collisions at the LHC provide a promising environment to search for signatures with displaced vertices in well-motivated New Physics scenarios. Compared to proton collisions, they offer several advantages, i) the number of parton level interactions per collision is larger, ii) there is no pile-up, iii) the lower instantaneous luminosity compared to proton collisions allows to operate the LHC experiments with very loose triggers, and iv) there are new production mechanisms that are absent in proton collisions. In the present work we focus on the third point and show that the modification of the triggers alone can increase the number of observable events by orders of magnitude if the long lived particles are predominantly produced with low transverse momentum. Our results show that collisions of ions lighter than lead are well-motivated from the viewpoint of searches for New Physics. We illustrate this for the example of heavy neutrinos in the Neutrino Minimal Standard Model.

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Section: Average Instantaneous Luminositymentioning

confidence: 99%