Accelerator Neutrinos

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The CLEO III Ring Imaging Cherenkov detector

NUCL INSTRUM METH A 409:1-3 (1998) 375-378

Authors:

M Artuso, F Azfar, A Efimov, D He, S Kopp, R Mountain, S Schuh, T Skwarnicki, S Stone, G Viehhauser, X Xing, S Anderson, Y Kubota, R Poling, A Smith, S Alam, S Timm, T Coan, V Fadeyev, J Staeck, I Volobouev, D Cinabro, L Perera

Abstract:

The CLEO detector is undergoing major improvements in conjunction with a high luminosity upgrade of the CESR e(+)e(-) collider. A novel element is a state of the art particle identification system, based on a proximity focused Ring Imaging Cherenkov detector. This detector will provide an excellent hadron identification at all the momenta relevant to the study of the decays of B mesons produced at the Upsilon(4S) resonance. Some features unique to our design will be discussed together with some results achieved on individual components. (C) 1998 Elsevier Science B.V. All rights reserved.
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Search for the proton decay mode p → ν K+ in Soudan 2

Physics Letters Section B Nuclear Elementary Particle and High Energy Physics 427:1-2 (1998) 217-224

Authors:

WWM Allison, GJ Alner, DS Ayres, G Barr, WL Barrett, C Bode, PM Border, CB Brooks, JH Cobb, R Cotton, H Courant, DM Demuth, TH Fields, HR Gallagher, C Garcia-Garcia, MC Goodman, R Gran, T Joffe-Minor, T Kafka, SMS Kasahara, W Leeson, PJ Litchfield, NP Longley, WA Mann, ML Marshak, RH Milburn, WH Miller, L Mualem, A Napier, WP Oliver, GF Pearce, EA Peterson, DA Petyt, LE Price, K Ruddick, J Schneps, MH Schub, R Seidlein, A Stassinakis, H Tom, JL Thron, V Vassiliev, G Villaume, S Wakeley, D Wall, N West, UM Wielgosz

Abstract:

We have searched for the proton decay mode p → ν K+ using the one-kiloton Soudan 2 high resolution calorimeter. Contained events obtained from a 3.56 kiloton-year fiducial exposure through June 1997 are examined for occurrence of a visible K+ track which decays at rest into μ+ ν or π+ π0. We found one candidate event consistent with background, yielding a limit, τ/B(p → ν K+) > 4.3 × 1031 years at 90% CL with no background subtraction. © 1998 Published by Elsevier Science B.V. All rights reserved.
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Search for trilepton signatures from associated gaugino pair production

Physical Review Letters 80:8 (1998) 1591-1596

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 on a search for the trilepton decay signature from the associated production of supersymmetric gaugino pairs, χ∼±1χ∼02, within the context of minimal supersymmetric models that conserve R parity. This search uses 95 pb−1 of pp− data taken at s = 1.8 TeV with the D0 detector. No evidence of a trilepton signature has been found, and a limit on the product of cross section times branching fraction to trileptons is given as a function of χ∼±1 mass. © 1998 The American Physical Society.
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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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