Search for heavy, long-lived particles that decay to photons in ppbar collisions at sqrt(s)=1.96 tev
Abstract
This dissertation presents the results of the first search for heavy, neutral, longlived
particles that decay to photons at a hadron collider. We use a sample of
+jet+missing transverse energy events in p¯p collisions at ps = 1.96 TeV taken with
the Collider Detector at Fermilab. Candidate events are selected based on the arrival
time of a high-energy photon at the electromagnetic calorimeter as measured with a
timing system that was recently installed. The final result is that we find 2 events,
using 570±34 pb−1 of data collected during 2004-2005 at the Fermilab Tevatron, consistent
with the background estimate of 1.3±0.7 events. While our search strategy
does not rely on model-specific dynamics, we interpret this result in terms of cross
section limits in a supersymmetric model with e01!
eG and set a world-best e01
mass
reach of 101 GeV/c2 at e = 5 ns. We can exclude any
+jet+missing transverse
energy signal that would produce more than 5.5 events.
Citation
Wagner, Peter (2007). Search for heavy, long-lived particles that decay to photons in ppbar collisions at sqrt(s)=1.96 tev. Doctoral dissertation, Texas A&M University. Available electronically from https : / /hdl .handle .net /1969 .1 /ETD -TAMU -1962.