Prospects of Searches for Neutral, Long-Lived Particles which Decay to Photons using Timing at CDF

Abstract

We present the prospects of searches for neutral, long-lived particles which decay to photons using their time of arrival measured with a newly installed timing system on the electromagnetic calorimeter (EMTiming) of the Collider Detector at Fermilab (CDF). A Monte Carlo simulation shows that EMTiming can provide separation between decay photons from particles with both a long lifetime and a low boost, and prompt photons from Standard Model backgrounds. Using a gauge mediated supersymmetry breaking (GMSB) ${\tilde{\chi }}_1^0\to \gamma \tilde{G}$ model we estimate a quasi-model-independent sensitivity using only direct neutralino pair production, and also estimate the expected 95% confidence level exclusion regions for all superpartner production as a function of the neutralino mass and lifetime. We find that a combination of single photon and diphoton analyses should allow the Tevatron in run II to easily extend the exclusion regions from LEP II at high neutralino masses and lifetimes, and cover much, if not all, of the theoretically favored $m_{\tilde{G}}$ < 1 keV/c^2 parameter space for neutralino masses less than 150 GeV/c^2.

15 pages, 21 figures; to be submitted to Phys. Rev. D

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• The Timing System for the CDF Electromagnetic Calorimeters
• Search for Heavy, Long-Lived Particles that Decay to Photons at CDF II
• Search for Heavy, Long-Lived Neutralinos that Decay to Photons at CDF II Using Photon Timing
• A signature-based search for delayed photons in exclusive photon plus missing transverse energy events from $p\bar{p}$ collisions with $\sqrt{s}=1.96$ TeV
• Prospects of Searches for Gauge Mediated Supersymmetry with h^0 -> χ_1^0 χ_1^0 production in the Time-Delayed Photon + MET Final State at the Tevatron
• Searches for Long-lived Particles at the Tevatron Collider
• Cosmo-Particle Searches for Supersymmetry at the Collider Detector at Fermilab
• Probing axino LSP from diphotons events with large missing transverse energy