corner
corner

Phys. Rev. Lett. 99, 121801 (2007) [7 pages]

Search for Heavy Long-Lived Particles that Decay to Photons at CDF II

Download: PDF (245 kB) Buy this article Export: BibTeX or EndNote (RIS)

A. Abulencia et al. CDF Collaboration
Show All Authors/Affiliations

Received 5 April 2007; published 17 September 2007

We present the first search for heavy, long-lived particles that decay to photons at a hadron collider. We use a sample of γ+jet+missing transverse energy events in pp̅ collisions at s=1.96  TeV taken with the CDF II detector. Candidate events are selected based on the arrival time of the photon at the detector. Using an integrated luminosity of 570  pb-1 of collision data, we observe 2 events, consistent with the background estimate of 1.3±0.7 events. While our search strategy does not rely on model-specific dynamics, we set cross section limits in a supersymmetric model with χ˜10γG˜ and place the world-best 95% C.L. lower limit on the χ˜10 mass of 101  GeV/c2 at τχ˜10=5  ns.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.121801
DOI:
10.1103/PhysRevLett.99.121801
PACS:
13.85.Rm, 12.60.Jv, 13.85.Qk, 14.80.Ly