Search for heavy long-lived particles that decay to photons at CDF II

Authors

A. Abulencia, University of Illinois Urbana-Champaign
J. Adelman, The Enrico Fermi Institute
T. Affolder, University of California, Santa Barbara
T. Akimoto, University of Tsukuba
M. G. Albrow, Fermi National Accelerator Laboratory
S. Amerio, Università degli Studi di Padova
D. Amidei, University of Michigan, Ann Arbor
A. Anastassov, Rutgers University–New Brunswick
K. Anikeev, Fermi National Accelerator Laboratory
A. Annovi, INFN, Laboratori Nazionali Di Frascati
J. Antos, Univerzita Komenského v Bratislave
M. Aoki, University of Tsukuba
G. Apollinari, Fermi National Accelerator Laboratory
T. Arisawa, Waseda University
A. Artikov, Joint Institute for Nuclear Research, Dubna
W. Ashmanskas, Fermi National Accelerator Laboratory
A. Attal, Universitat Autònoma de Barcelona
A. Aurisano, University of Oxford
F. Azfar, University of Oxford
P. Azzi-Bacchetta, Università degli Studi di Padova
P. Azzurri, Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
N. Bacchetta, Università degli Studi di Padova
W. Badgett, Fermi National Accelerator Laboratory
A. Barbaro-Galtieri, Lawrence Berkeley National Laboratory
V. E. Barnes, Purdue University
B. A. Barnett, Johns Hopkins University
S. Baroiant, University of California, Davis
V. Bartsch, University College London

Document Type

Article

Publication Date

9-17-2007

Abstract

We present the first search for heavy, long-lived particles that decay to photons at a hadron collider. We use a sample of Î+jet+missing transverse energy events in pp 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 570pb-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 I E 10 GE and place the world-best 95% C.L. lower limit on the χ˜10 mass of 101 GeV/c2 at Ï.,χ˜10=5ns. © 2007 The American Physical Society.

Publication Source (Journal or Book title)

Physical Review Letters

Recommended Citation

Abulencia, A., Adelman, J., Affolder, T., Akimoto, T., Albrow, M., Amerio, S., Amidei, D., Anastassov, A., Anikeev, K., Annovi, A., Antos, J., Aoki, M., Apollinari, G., Arisawa, T., Artikov, A., Ashmanskas, W., Attal, A., Aurisano, A., Azfar, F., Azzi-Bacchetta, P., Azzurri, P., Bacchetta, N., Badgett, W., Barbaro-Galtieri, A., Barnes, V., Barnett, B., Baroiant, S., & Bartsch, V. (2007). Search for heavy long-lived particles that decay to photons at CDF II. Physical Review Letters, 99 (12) https://doi.org/10.1103/PhysRevLett.99.121801