Accelerator Neutrinos

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Measurement of the decay KL → e+e-γγ

Physics Letters Section B Nuclear Elementary Particle and High Energy Physics 420:1-2 (1998) 205-210

Authors:

MG Setzu, A Nappi, A Beisser, T Beier, H Blümer, P Buchholz, D Coward, K Kleinknecht, F Leber, B Renk, H Rohrer, HG Sander, F Scheerer, J Scheidt, J Staeck, A Wagner, GD Barr, D Cundy, N Doble, L Gatignon, P Grafström, R Hagelberg, H Wahl, KJ Peach, E Augé, D Fournier, L Iconomidou-Fayard, O Perdereau, AC Schaffer, L Serin, L Bertanza, A Bigi, P Calafiura, M Calvetti, R Carosi, R Casali, R Fantechi, I Mannelli, VM Marzulli, GM Pierazzini, M Holder, A Kreutz, R Werthenbach

Abstract:

The full data set of the NA31 experiment at CERN has been used to analyse the decay mode KOL → e+ e-γγ. A signal of 47 events has been observed with an estimated background of 6.9 events. The total number of kaon decays in the decay volume was determined to be (2.1 ± 0.1stat) · 109. This corresponds to a branching ratio of (8.0 ± 1.5+1.4-1.2)· 10-7. © 1998 Published by Elsevier Science B.V.
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First measurement of the rate K0L → πμνγ

Physics Letters Section B Nuclear Elementary Particle and High Energy Physics 418:3-4 (1998) 411-418

Authors:

M Bender, I Augustin, M Holder, I Schwarze, M Ziolkowski, V Fanti, A Lai, L Musa, A Nappi, MG Setzu, RW Moore, DJ Munday, MA Parker, SF Takach, TO White, G Barr, G Bocquet, J Bremer, A Ceccucci, J Cogan, D Cundy, N Doble, G Fischer, W Funk, L Gatignon, A Gianoli, A Gonidec, P Grafstrom, W Kubischta, V Marzulli, G Kesseler, JP Matheys, A Norton, S Palestini, B Panzer-Steindel, D Schinzel, H Taureg, M Velasco, O Vossnack, V Kekelidze, I Kojevnikov, I Potrebenikov, G Tatichvili, A Tkatchev, L Bertolotto, O Boyle, B Hay, NE Mc Kay, G Oakland, H Parsons, KJ Peach, C Talamonti, A Walker, P Dalpiaz, J Duclos, A Formica, PL Frabetti, M Martini, F Petrucci, M Porcu, F Rossi, M Savrie, C Siman, A Bizzeti, M Calvetti, M Lenti, A Michetti, HG Becker, T Beier, H Blümer, P Buchholz, D Coward, C Ebersberger, A Kalter, K Kleinknecht, U Koch, L Köpke, F Leber, S Luitz, B Renk, J Scheidt, J Schmidt, V Schönharting, R Wilhelm, O Zeitnitz, JC Chollet, S Crépé, L Fayard, L Iconomidou-Fayard, J Ocariz, G Unal, G Anzivino, P Cenci, P Lubrano, M Pepe, P Calafiura, R Carosi, R Casali, C Cerri, F Costantini

Abstract:

In a preliminary version of the NA48 experiment at the CERN SPS, in which an iron-scintillator sandwich calorimeter was used as a photon detector, the ratio of KL → πμνγ and KL → πμν decays was measured. The branching ratio BR(KL → πμνγ,E*γ ≥30 MeV)/(KL → πμν) is found to be (2.08 ± 0.17+0.16-0.21) × 10-3, where the first error is statistical and the second systematic. The result is in agreement with theoretical predictions. © 1998 Elsevier Science B.V.
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Evaluation of fermi read-out of the atlas tilecal prototype

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 403:1 (1998) 98-114

Authors:

Z Ajaltouni, F Albiol, A Alifanov, P Amaral, D Amelin, A Amorim, K Anderson, C Angelini, S Agnvall, A Antola, F Astesan, A Astvatsaturov, D Autiero, F Badaud, G Barreira, R Benetta, S Berglund, G Blanchot, E Blueher, C Blaj, P Bodö, A Bogush, C Bohm, V Boldea, O Borisov, M Bosnian, N Bouhemaid, P Brette, L Breveglieri, C Bromberg, M Brossard, J Budagov, L Caloba, J Carvalho, P Casado, A Castera, PW Cattaneo, M Cavalli-Sforza, V Cavasinni, R Chadelas, JC Chevaleyre, I Chirikov-Zorin, G Chlachidze, M Cobal, F Cogswell, F Colaço, S Constantinescu, D Costanzo, M Crouau, L Dadda, 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, JJ Dugne, I Efthymiopoulos, M Engström, D Errede, S Errede, H Evans, A Fenyuk, A Ferrer, A Fristedt, V Flaminio, E Gallas, M Gaspar, O Gildemeister, M Givoletto, V Glagolev, VG Goggi, A Gomes, S Gong, Y Gouz, V Grabsky, M Grieco, H Hakopian, M Haney, M Hansen, S Hellman, A Henriques, H Hentzell, T Holmberg, S Holmgren, PF Honoré, J Huston, Y Ivanyushenkov, K Jon-And, A Juste, S Kakurin, G Karapetian, A Karyukhin

Abstract:

Prototypes of the FERMI system have been used to read out a prototype of the ATLAS hadron calorimeter in a beam test at the CERN SPS. The FERMI read-out system, using a compressor and a sampling ADC, is compared to a standard charge integrating read-out by measuring the energy resolution of the calorimeter separately with the two systems on the same events. Signal processing techniques have been designed to optimize the treatment of FERMI data. The resulting energy resolution is better than the one obtained with the standard read-out. © 1998 Elsevier Science B.V. All rights reserved.
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A measurement of the W Boson mass at the fermilab pp¯ Collider

Physical Review Letters 80:14 (1998) 3008-3013

Authors:

B Abbott, M Abolins, BS Acharya, I Adam, DL Adams, M Adams, S Ahn, H Aihara, GA Alves, N Amos, EW Anderson, R Astur, MM Baarmand, A Baden, V Balamurali, J Balderston, B Baldin, S Banerjee, J Bantly, E Barberis, JF Bartlett, K Bazizi, A Belyaev, SB Beri, I Bertram, VA Bezzubov, PC Bhat, V Bhatnagar, M Bhattacharjee, N Biswas, G Blazey, S Blessing, P Bloom, A Boehnlein, NI Bojko, F Borcherding, C Boswell, A Brandt, R Brock, A Bross, D Buchholz, VS Burtovoi, JM Butler, W Carvalho, D Casey, Z Casilum, H Castilla-Valdez, D Chakraborty, SM Chang, SV Chekulaev, LP Chen, W Chen, S Choi, S Chopra, BC Choudhary, JH Christenson, M Chung, D Claes, AR Clark, WG Cobau, J Cochran, L Coney, WE Cooper, 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, D Edmunds, J Ellison, VD Elvira, R Engelmann, S Eno, G Eppley, P Ermolov, OV Eroshin, VN Evdokimov, T Fahland, MK Fatyga, S Feher, D Fein, T Ferbel, G Finocchiaro, HE Fisk, Y Fisyak, E Flattum, GE Forden

Abstract:

We report a measurement of the W boson mass based on an integrated luminosity of 82pb-1 from pp¯ collisions at √s = 1.8 TeV recorded in 1994-1995 by the D0 detector at the Fermilab Tevatron. We identify W bosons by their decays to ev and extract the mass by fitting the transverse mass spectrum from 28 323 W boson candidates. A sample of 3563 dielectron events, mostly due to Z → ee decays, constrains models of W boson production and the detector. We measure MW = 80.44 ± 0.10(stat) ± 0.07(syst) GeV. By combining this measurement with our result form the 1992-1993 data set, we obtain MW = 80.43 ± 0.11 GeV. © 1998 The American Physical Society.
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Determination of the mass of the W boson using the D detector at the Fermilab Tevatron

Physical Review D Particles Fields Gravitation and Cosmology 58:1 (1998)

Authors:

B Abbott, M Abolins, BS Acharya, I Adam, DL Adams, M Adams, S Ahn, H Aihara, GA Alves, E Amidi, N Amos, EW Anderson, R Astur, MM Baarmand, A Baden, V Balamurali, J Balderston, B Baldin, S Banerjee, J Bantly, E Barberis, JF Bartlett, K Bazizi, A Belyaev, SB Beri, I Bertram, VA Bezzubov, PC Bhat, V Bhatnagar, M Bhattacharjee, N Biswas, G Blazey, S Blessing, P Bloom, A Boehnlein, NI Bojko, F Borcherding, C Boswell, A Brandt, R Brock, A Bross, D Buchholz, VS Burtovoi, JM Butler, W Carvalho, D Casey, Z Casilum, H Castilla-Valdez, D Chakraborty, SM Chang, SV Chekulaev, LP Chen, W Chen, S Choi, 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 Davis, K De, K Del Signore, M Demarteau, N Denisenko, D Denisov, SP Denisov, HT Diehl, M Diesburg, G Di Loreto, P Draper, Y Ducros, LV Dudko, SR Dugad, D Edmunds, J Ellison, VD Elvira, R Engelmann, S Eno, G Eppley, P Ermolov, OV Eroshin, VN Evdokimov, T Fahland, M Fatyga, MK Fatyga, S Feher, D Fein, T Ferbel, G Finocchiaro, HE Fisk, Y Fisyak

Abstract:

A measurement of the mass of the [Formula Presented] boson is presented which is based on a sample of 5982 [Formula Presented] decays observed in [Formula Presented] collisions at [Formula Presented] TeV with the D detector during the 1992–1993 run. From a fit to the transverse mass spectrum, combined with measurements of the [Formula Presented] boson mass, the [Formula Presented] boson mass is measured to be [Formula Presented] Detailed discussions of the determination of the absolute energy scale, the measured efficiencies, and all systematic uncertainties are presented. © 1998 The American Physical Society.
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