Colliding Heavy Ions in the LHC

Jowett, John

doi:10.18429/jacow-ipac2018-tuxgbd2

Cited by 3 publications

(4 citation statements)

References 13 publications

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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%

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

et al. 2020

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“…In pp collisions the LHC has so far reached a world record luminosity of 2.1 × 10 34 cm −2 s −1 , which, within the measurement accuracy, equals the record for e + e − colliders still held by KEKB. For the LHC's ATLAS and CMS experiments, in the first ten years of the LHC operation, the P b − P b luminosity well exceeded the design value of 10 27 cm −2 s −1 , while for the ALICE experiment the luminosity needed to be "levelled" around this value [351]. The LHC can also provide P b − p collisions as it did in 2013 and 2016, and other ion-ion or ion-proton collisions, at different energies.…”

Section: Lhcmentioning

confidence: 95%

“…This process, with a large cross section of about σ ∼ 280 barn, generates a secondary beam of 208 P b 81+ ions, with a fractional rigidity change equivalent to a relative momentum deviation of δ = 0.0124, that can potentially quench superconducting magnets downstream of the IP (see Ref. [351] and references therein). In 2015, orbit bumps were introduced to displace the BFPP losses safely into a connection cryostat, thereby avoiding magnet quenches [351].…”

Section: Lhcmentioning

confidence: 99%