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System tests of radiation hard optical links for the ATLAS semiconductor tracker

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 443:2 (2000) 430-446

Authors:

DG Charlton, JD Dowell, RJ Homer, P Jovanovic, IR Kenyon, G Mahout, HR Shaylor, JA Wilson, A Rudge, J Fopma, I Mandic, RB Nickerson, P Shield, R Wastie, AR Weidberg, LO Eek, A Go, B Lund-Jensen, M Pearce, J Söderqvist, M Morrissey, DJ White

Abstract:

A prototype optical data and Timing, Trigger and Control transmission system based on LEDs and PIN-diodes has been constructed. The system would be suitable in terms of radiation hardness and radiation length for use in the ATLAS SemiConductor Tracker. Bit error rate measurements were performed for the data links and for the links distributing the Timing, Trigger and Control data from the counting room to the front-end modules. The effects of cross-talk between the emitters and receivers were investigated. The advantages of using Vertical Cavity Surface Emitting Lasers (VCSELs) instead of LEDs are discussed.
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Differential production cross section of Z bosons as a function of transverse momentum at √s = 1.8 TeV

Physical Review Letters 84:13 (2000)

Authors:

B Abbott, M Abolins, V Abramov, BS Acharya, I Adam, DL Adams, M Adams, S Ahn, V Akimov, GA Alves, N Amos, EW Anderson, MM Baarmand, VV Babintsev, L Babukhadia, A Baden, B Baldin, S Banerjee, J Bantly, E Barberis, P Baringer, JF Bartlett, A Belyaev, SB Beri, I Bertram, VA Bezzubov, PC Bhat, V Bhatnagar, M Bhattacharjee, G Blazey, S Blessing, P Bloom, A Boehnlein, NI Bojko, F Borcherding, C Boswell, A Brandt, R Breedon, G Briskin, R Brock, A Bross, D Buchholz, VS Burtovoi, JM Butler, W Carvalho, D Casey, Z Casilum, H Castilla-Valdez, D Chakraborty, KM Chan, SV Chekulaev, W Chen, DK Cho, S Choi, S Chopra, BC Choudhary, JH Christenson, M Chung, D Claes, AR Clark, WG Cobau, J Cochran, L Coney, WE Cooper, D Coppage, C Cretsinger, D Cullen-Vidal, MAC Cummings, D Cutts, OI Dahl, K Davis, K De, K del Signore, M Demarteau, D Denisov, SP Denisov, HT Diehl, M Diesburg, G di Loreto, P Draper, Y Ducros, LV Dudko, SR Dugad, A Dyshkant, D Edmunds, J Ellison, VD Elvira, R Engelmann, S Eno, G Eppley, P Ermolov, OV Eroshin, J Estrada, H Evans, VN Evdokimov, T Fahland, MK Fatyga, S Feher, D Fein, T Ferbel

Abstract:

We present a measurement of the transverse momentum distribution of Z bosons produced in pp collisions at √s = 1.8 TeV from data collected by the D experiment at the Fermilab Tevatron Collider. We find good agreement between our results and current resummation calculations, and also use our data to extract nonperturbative parameters for a particular version of the resummation formalism. The resulting values are significantly more precise than obtained in previous determinations. © 2000 The American Physical Society.
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Isolated photon cross section in p p̄ collisions at √s = 1.8 TeV

Physical Review Letters 84:13 (2000)

Authors:

B Abbott, M Abolins, V Abramov, BS Acharya, DL Adams, M Adams, S Ahn, V Akimov, GA Alves, N Amos, EW Anderson, MM Baarmand, VV Babintsev, L Babukhadia, A Baden, B Baldin, S Banerjee, J Bantly, E Barberis, P Baringer, JF Bartlett, U Bassler, A Belyaev, SB Beri, G Bernardi, I Bertram, VA Bezzubov, PC Bhat, V Bhatnagar, M Bhattacharjee, G Blazey, S Blessing, A Boehnlein, NI Bojko, F Borcherding, A Brandt, R Breedon, G Briskin, R Brock, G Brooijmans, A Bross, D Buchholz, V Buescher, VS Burtovoi, JM Butler, W Carvalho, D Casey, Z Casilum, H Castilla-Valdez, D Chakraborty, KM Chan, SV Chekulaev, W Chen, DK Cho, S Choi, S Chopra, BC Choudhary, JH Christenson, M Chung, D Claes, AR Clark, WG Cobau, J Cochran, L Coney, B Connolly, WE Cooper, D Coppage, D Cullen-Vidal, MAC Cummings, D Cutts, OI Dahl, K Davis, K De, K Del Signore, M Demarteau, D Denisov, SP Denisov, HT Diehl, M Diesburg, G di Loreto, P Draper, Y Ducros, LV Dudko, SR Dugad, A Dyshkant, D Edmunds, J Ellison, VD Elvira, R Engelmann, S Eno, G Eppley, P Ermolov, OV Eroshin, J Estrada, H Evans, VN Evdokimov, T Fahland, S Feher, D Fein, T Ferbel

Abstract:

We report a new measurement of the cross section for the production of isolated photons with transverse energies (E T γ) above 10 GeV and pseudorapidities |η| < 2.5 in p̄ collisions at √s = 1.8 TeV. The results are based on a data sample of 107.6 pb -1 recorded during 1992-1995 with the D0 detector at the Fermilab Tevatron collider. The background, predominantly from jets which fragment to neutral mesons, was estimated using the longitudinal shower shape of photon candidates in the calorimeter. The measured cross section is in good agreement with the next-to-leading order QCD calculation for E T γ ≳ 36 GeV. © 2000 The American Physical Society.
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Hadronic shower development in Iron-Scintillator Tile Calorimetry

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 443:1 (2000) 51-70

Authors:

P Amaral, A Amorim, K Anderson, G Barreira, R Benetta, S Berglund, C Biscarat, G Blanchot, E Blucher, A Bogush, C Bohm, V Boldea, O Borisov, M Bosman, C Bromberg, J Budagov, S Burdin, L Caloba, J Carvalho, P Casadog, MV Castillo, M Cavalli-Sforza, V Cavasinni, R Chadelas, I Chirikov-Zorin, G Chlachidze, M Cobal, F Cogswell, F Colaço, S Cologna, S Constantinescu, D Costanzo, M Crouau, F Daudon, J David, M David, T Davidek, J Dawson, K De, T del Prete, A de Santo, B di Girolamo, S Dita, J Dolejsi, Z Dolezal, R Downing, I Efthymiopoulos, M Engström, D Errede, S Errede, H Evans, A Fenyuk, A Ferrer, V Flaminio, E Gallas, M Gaspar, I Gil, O Gildemeister, V Glagolev, A Gomes, V Gonzalez, S de la González Hoz, V Grabski, E Grauges, P Grenier, H Hakopian, M Haney, M Hansen, S Hellman, A Henriques, C Hebrard, E Higon, S Holmgren, J Huston, Y Ivanyushenkov, K Jon-And, A Juste, S Kakurin, G Karapetian, A Karyukhin, S Kopikov, V Kukhtin, Y Kulchitsky, W Kurzbauer, M Kuzmin, S Lami, V Lapin, C Lazzeroni, A Lebedev, R Leitner, J Li, Y Lomakin, O Lomakina, M Lokajicek, JM Lopez Amengual, A Maio, S Malyukov, F Marroquin, JP Martins, E Mazzoni

Abstract:

The lateral and longitudinal profiles of hadronic showers detected by a prototype of the ATLAS Iron-Scintillator Tile Hadron Calorimeter have been investigated. This calorimeter presents a unique longitudinal configuration of scintillator tiles. Using a fine-grained pion beam scan at 100 GeV, a detailed picture of transverse shower behaviour is obtained. The underlying radial energy densities for the four depth segments and for the entire calorimeter have been reconstructed. A three-dimensional hadronic shower parametrization has been developed. The results presented here are useful for understanding the performance of iron-scintillator calorimeters, for developing fast simulations of hadronic showers, for many calorimetry problems requiring the integration of a shower energy deposition in a volume and for future calorimeters design.
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Limits on Gravitino Production and New Processes with Large Missing Transverse Energy in p-pbar Collisions at sqrt(s)=1.8 TeV

ArXiv hep-ex/0003026 (2000)

Authors:

CDF Collaboration, T Affolder
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