Tracking down Quirks at the Large Hadron Collider

Abstract

Non-helical tracks are the smoking gun signature of charged and/or colored quirks, which are pairs of particles bound by a new, long-range confining force. We propose a method to efficiently search for these non-helical tracks at the LHC, without the need to fit their trajectories. We show that the hits corresponding to quirky trajectories can be selected efficiently by searching for co-planar hits in the inner layers of the ATLAS and CMS trackers, even in the presence of on average 50 pile-up vertices. We further argue that backgrounds from photon conversions and unassociated pile-up hits can be removed almost entirely, while maintaining a signal reconstruction efficiency as high as 70%. With the 300 fb${}^{-1}$ dataset, this implies a discovery potential for string tension between 100 eV and 30 keV, and colored (electroweak charged) quirks as heavy as 1600 (650) GeV may be discovered.

9 pages, 10 figures, submitted to PRD, minor changes

References in corpus (11)

• PYTHIA 6.4 Physics and Manual
• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• An Introduction to PYTHIA 8.2
• Echoes of a Hidden Valley at Hadron Colliders
• Search for long-lived charged particles in proton-proton collisions at sqrt(s) = 13 TeV
• Search for long-lived neutral particles decaying to quark-antiquark pairs in proton-proton collisions at sqrt(s) = 8 TeV
• Search for disappearing tracks in proton-proton collisions at sqrt(s) = 8 TeV
• Performance of the ATLAS muon trigger in pp collisions at $\sqrt{s}=8$ TeV
• The Quirky Collider Signals of Folded Supersymmetry
• CMS Hardware Track Trigger: New Opportunities for Long-Lived Particle Searches at the HL-LHC
• Search for new fermions ("quirks") at the Fermilab Tevatron Collider