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

Physical Review Letters 99:12 (2007)

Authors:

A Abulencia, J Adelman, T Affolder, T Akimoto, MG Albrow, S Amerio, D Amidei, A Anastassov, K Anikeev, A Annovi, J Antos, M Aoki, G Apollinari, T Arisawa, A Artikov, W Ashmanskas, A Attal, A Aurisano, F Azfar, P Azzi-Bacchetta, P Azzurri, N Bacchetta, W Badgett, A Barbaro-Galtieri, VE Barnes, BA Barnett, S Baroiant, V Bartsch, G Bauer, PH Beauchemin, F Bedeschi, S Behari, G Bellettini, J Bellinger, A Belloni, D Benjamin, A Beretvas, J Beringer, T Berry, A Bhatti, M Binkley, D Bisello, I Bizjak, RE Blair, C Blocker, B Blumenfeld, A Bocci, A Bodek, V Boisvert, G Bolla, A Bolshov, D Bortoletto, J Boudreau, A Boveia, B Brau, L Brigliadori, C Bromberg, E Brubaker, J Budagov, HS Budd, S Budd, K Burkett, G Busetto, P Bussey, A Buzatu, KL Byrum, S Cabrera, M Campanelli, M Campbell, F Canelli, A Canepa, S Carillo, D Carlsmith, R Carosi, S Carron, B Casal, M Casarsa, A Castro, P Catastini, D Cauz, M Cavalli-Sforza, A Cerri, L Cerrito, SH Chang, YC Chen, M Chertok, G Chiarelli, G Chlachidze, F Chlebana, I Cho, K Cho, D Chokheli, JP Chou, G Choudalakis, SH Chuang, K Chung, WH Chung, YS Chung, M Cilijak, CI Ciobanu

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.
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International Linear Collider Reference Design Report Volume 2: PHYSICS AT THE ILC

ArXiv 0709.1893 (2007)

Authors:

Abdelhak Djouadi, Joseph Lykken, Klaus Mönig, Yasuhiro Okada, Mark Oreglia, Satoru Yamashita
Details from ArXiV

Search for resonant ttbar production in ppbar collisions at sqrt{s}=1.96 TeV

ArXiv 0709.0705 (2007)

Authors:

CDF Collaboration, T Aaltonen
Details from ArXiV

Including heavy flavour production in PDF fits

(2007)
Details from ArXiV
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Radiation hardness studies of VCSELs and PINS for the opto-links of the Atlas SemiConductor Tracker

NUCL INSTRUM METH A 579:2 (2007) 795-800

Authors:

ML Chu, S Hou, T Huffman, C Issever, SC Lee, RS Lu, DS Su, PK Teng, AR Weidberg

Abstract:

We study the radiation hardness of the Vertical Cavity Surface Emitting Laser diodes (VCSELs) and the epitaxial silicon PIN diodes that will be used for the Atlas SemiConductor Tracker at the CERN Large Hadron Collider. The tests were conducted with 200 MeV protons to a fluence of 4 x 10(14) p/cm(2) and with 20 MeV (average energy) neutrons to 7.7 x 10(14) n/cm(2). The radiation damage of the VCSELs and PINs and the annealing characteristics are presented. (c) 2007 Elsevier B.V. All rights reserved.
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