Accelerator Neutrinos

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A fully software-programmable pipelined trigger-processing module

IEEE T NUCL SCI 43:3 (1996) 1689-1694

Authors:

GD Barr, F Formenti, W Iwanski, P Kapusta, H Wahl, M Ziolkowski

Abstract:

We describe a general purpose 40MHz pipelined trigger processing board containing six look-up tables and the logic needed to programmably route the signals between them. A series of identical boards are connected in cascade in the NA48 CP-violation experiment at CERN, accept digital inputs generated from calorimeter signals and are used to perform the different computations necessary for the trigger reconstruction. The board architecture is designed to be flexible so that a single basic hardware design can perform all the different algorithms we require and so that the trigger algorithms can be adapted if needed. The computation latency of the combined network of eight boards is approximately 3 mu s. We present examples of some of the functions which have been implemented. We discuss the automatic reprogramming software which has been developed so that a new design can be implemented easily.
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High rate large dynamic range analog circuitry and digitizers for fast calorimetry

IEEE T NUCL SCI 43:3 (1996) 1605-1609

Authors:

B Hallgren, F Bal, GD Barr, P Buchholz, F Formenti, W Funk, Y Kozhevnikov, A Lacourt, G Laverriere, M Martini, A Papi, P Ponting, M Sozzi, O Vossnack, H Wahl

Abstract:

This paper describes the issues encountered in the design of a large dynamic range digitizer for calorimetry. A gain switching technology developed for the liquid krypton calorimeter of the NA48 CP-violation experiment at CERN is described in detail. 14 bit dynamic range and better than 300 ps time resolution were achieved in beam tests with an 8 channel prototype. A mixed analog/digital ASIC has been developed. A 13'500 channel system is being produced which will be put into operation in 1996.
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Preliminary results from the Russian-American Gallium Experiment Cr-neutrino source measurement

Nuclear and Particle Physics Proceedings Elsevier 48:1-3 (1996) 370-374

Authors:

SR Elliott, JN Abdurashitov, TJ Bowles, ML Cherry, BT Cleveland, T Daily, R Davis, VN Gavrin, SV Girin, VV Gorbatschev, AO Gusev, AV Kalikhov, NG Khairnasov, VN Karaulov, TV Knodel, VN Kornoukhov, Yu S Khomyakov, K Lande, CK Lee, VL Levitin, VI Maev, IN Mirmov, PI Nazarenko, JS Nico, AM Pshukov, AM Shalagin, AA Shikhin, VS Shkol'nik, NV Skorikov, WA Teasdale, EP Veretenkin, VM Vermul, DL Wark, PW Wildenhain, JF Wilkerson, V Yants, GT Zatsepin, AV Zvonarev
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Results from SAGE

Nuclear and Particle Physics Proceedings Elsevier 48:1-3 (1996) 299-303

Authors:

JN Abdurashitov, VN Gavrin, SV Girin, VV Gorbatchev, AO Gusev, AV Kalikhov, TV Knodel, IN Mirmov, AM Pshukov, AM Shalagin, AA Shikhin, EP Veretenkin, VM Vermul, V Yants, GT Zatsepin, TJ Bowles, JS Nico, WA Teasdale, DL Wark, SR Elliott, JF Wilkerson, BT Cleveland, T Daily, R Davis, K Lande, CK Lee, PW Wildenhain, ML Cherry
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Search for right-handed w bosons and heavy W’ in pp¯ collisions at √s = 1.8 TeV

Physical Review Letters 76:18 (1996) 3271-3276

Authors:

S Abachi, B Abbott, M Abolins, BS Acharya, I Adam, DL Adams, M Adams, S Ahn, H Aihara, J Alitti, G Álvarez, GA Alves, E Amidi, N Amos, EW Anderson, SH Aronson, R Astur, RE Avery, A Baden, V Balamurali, J Balderston, B Baldin, J Bantly, JF Bartlett, K Bazizi, J Bendich, SB Beri, I Bertram, VA Bezzubov, PC Bhat, V Bhatnagar, M Bhattacharjee, A Bischoff, N Biswas, G Blazey, S Blessing, P Bloom, A Boehnlein, NI Bojko, F Borcherding, J Borders, C Boswell, A Brandt, R Brock, A Bross, D Buchholz, VS Burtovoi, JM Butler, W Carvalho, D Casey, H Castilla-Valdez, D Chakraborty, SM Chang, SV Chekulaev, LP Chen, W Chen, S Chopra, BC Choudhary, JH Christenson, M Chung, D Claes, AR Clark, WG Cobau, J Cochran, WE Cooper, C Cretsinger, D Cullen-Vidal, MAC Cummings, D Cutts, OI Dahl, K De, M Demarteau, R Demina, K Denisenko, N Denisenko, D Denisov, SP Denisov, HT Diehl, M Diesburg, G Di Loreto, R Dixon, P Draper, J Drinkard, Y Ducros, SR Dugad, S Durston-Johnson, D Edmunds, J Ellison, VD Elvira, R Engelmann, S Eno, G Eppley, P Ermolov, OV Eroshin, VN Evdokimov, S Fahey, T Fahland, M Fatyga, MK Fatyga, J Featherly

Abstract:

We report on a search for right-handed W bosons (WR) with mass greater than 200 GeV/c2. We used data collected with the D0 detector at the Fermilab Tevatron pp¯ collider at √s = 1.8 TeV to search for WR decays into an electron and a massive right-handed neutrino WR ±→e±NR. Using the inclusive electron data, we set mass limits independent of the NR decay: mWR>650 GeV/c2 and mWR>720 GeV/c2 at the 95% confidence level, valid for mNR<1/2 mWR and mNR≪mWR, respectively. The latter also represents a new lower limit on the mass of a heavy left-handed W boson (W’) decaying into eν. In addition, limits on mWR valid for larger values of the NR mass are obtained assuming that NR decays to an electron and two jets. © 1996 The American Physical Society.
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