An upper limit for the τ neutrino mass from τ → 5 π( π0) ντ decays

D Buskulic ,V Berlin,I.C Park,M.G Green,L Zhang,H Kim,D.W Kim,H.J Park,T Wang,J Zhang,F Forti ,C Gotzhein ,J L Harton ,B Vallage ,E Kneringer ,Р Тенчини ,F Palla ,L M Mir ,P Laurelli ,F Courault ,A Vayaki ,Z Ajaltouni ,C Goy ,W Maitland ,M Davier ,P Mató ,N R Keemer ,G Sanguinetti ,P Bourdon ,F Romanò ,T J Brodbeck ,A Lusiani ,Ll Garrido ,I Dawson ,G Iaselli ,A Venturi ,L Pitis ,K Kleinknecht ,G Lütz ,P Perret ,Apoorva Patel ,G Graefe ,A.w Halley ,S Nuzzo ,M Zheng ,A Böhrer ,J P Lees ,F J Munoz Sanchez ,Hongbo Hu ,B.s Nilsson ,G Martin ,A Cordier ,S Monteil ,M De Palma ,S.r Armstrong ,S González ,R Richter ,G Mannocchi ,R Xu ,C Grupen ,G Dissertori ,D Kühn ,P Hanke ,G Selvaggi ,P Pérez ,E Simopoulou ,J Rothberg ,R Wanke ,I G Knowles ,M Chmeissani ,T Wildish ,W Tejessy ,S M Walther ,I Ferrante ,U Bottigli ,R St Denis ,B Bloch-Devaux ,Siegmund Brandt ,J Knobloch ,H Kroha ,F Ragusa ,Z Feng ,J F Pusztaszeri ,D.p.s Ferguson ,L Passalacqua ,M H Schune ,G Calderini ,R Della Marina ,V Ciulli ,F Podlyski ,A Kyriakis ,M Frank ,C Bozzi ,F Le Diberder ,F Murtas ,T Sloan ,P Spagnolo ,D Johnson ,A Galla ,Y Xie ,P Elmer ,A Pacheco ,F Bossi ,D Jackson ,N Konstantinidis ,J Lefrançois ,A M Lutz ,G Ganis ,A Sciabà ,J.g Lynch ,J Minguet-Rodriguez ,H Meinhard ,M Pepe-Altarelli ,B Jost ,L Foà ,Eric O Feigl ,A Gregorio ,J D Turk ,W Cameron ,P Tempesta ,S Thorn ,H Wachsmuth ,J.c Thompson ,J.m Crespo ,L Bosisio ,L.f Thompson ,G Bujosa ,X T Huang ,P G Verdini ,A M Bencheikh ,V Sharma ,G Wolf ,F Fidecaro ,M Edwards ,R Beuselinck ,W Wiedenmann ,G.a Blair ,C Georgiopoulos ,Y S Gao ,M Schmelling ,W Orejudos ,M Thulasidas ,R.g Jacobsen ,M Corden ,J J Veillet ,S Xue ,R.p Johnson ,W Männer ,J F Renardy ,C Benchouk ,H Drevermann ,W Kozanecki ,I Siotis ,J B Hansen ,A Finch ,F Teubert ,H Dietl ,G Tonelli ,P Henrard ,B Pietrzyk ,A Trabelsi ,A Falvard ,C K Bowdery ,S Salomone ,A Roussarie ,A Koksal ,C Boyer ,M Verderi ,R Assmann ,M A Giorgi ,J Harvey ,A Rougé ,P Payre ,A S Schwarz ,P Colrain ,I Ten Have ,B Rensch ,L Duflot ,D Si Mohand ,M C Lemaire ,P H Hansen ,I R Tomalin ,J.a Nash ,P Azzurri ,C Raine ,J Grahl ,M Nuttall ,J Jousset ,G Bonvicini ,G Bologna ,D Abbaneo ,K Jakobs ,P Maley ,M.-N Minard ,A Bonissent ,M Rumpf ,P Comas ,G Triggiani ,T Medcalf ,F Ruggieri ,J K Sedgbeer ,J Raab ,X Wu ,A P Betteridge ,A S Thompson ,R Forty ,C Guicheney ,C.n Booth ,P Gay ,M Bardadin-Otwinowska ,Y Pan ,G Lutters ,I Videau ,J C Brient ,G Batignani ,M Carpinelli ,O Callot ,M A Ciocci ,P Heusse ,B Gobbo ,H Stenzel ,I Efthymiopoulos ,Ph Ghez ,A Messineo ,V Hepp ,O Braun ,F V Weber ,D Calvet ,O.j Hayes ,I Scott ,P Colas ,R Alemany ,M Delfino ,P Perrodo ,G Felici ,M Wunsch ,L Smolík ,J P Schuller ,E E Kluge ,P Girtler ,J Schwindling ,V Gaitan ,H G Sander ,C Geweniger ,M G Smith ,A Ranieri ,K C Moffeit ,J Boucrot ,D Colling ,P Coyle ,D N Brown ,P Campana ,M Maggi ,Pedro Saraiva ,K Zachariadou ,J.-F Grivaz ,M Schmitt ,Michael G Schmidt ,L Bellantoni ,G N Taylor ,D Botterill ,J M Nachtman ,P Janot ,Irena Nikolić ,D Schlatter ,M Letho ,M Martı́nez ,I Abt ,P.a Mcnamara ,D Creanza ,D Nicod ,A Farilla ,E B Martin ,J D Hansen ,H Videau ,W T Morton ,G Zito ,F Ranjard ,E Veitch ,A M Greene ,S W Snow ,B Marx ,R Dell’orso ,J Walsh ,W M Newton ,P Reeves ,D J Candlin ,F Ariztizabal ,I De Bonis ,D Pallin ,Q Ouyang ,H Duarte ,J Steinberger ,B Renk ,G Mäggi ,A Beddall ,D Décamp ,A Blondel ,A M Walsh ,G Bagliesi ,Y Saadi ,A Engelhardt ,J Proriol ,M Cattaneo ,H Seywerd ,S L Wu ,C Vannini ,P J Dornan ,R Veenhof ,G Parrini ,M I Parsons ,P R Norton ,Á Pascual ,G Cowan ,A M Stacey ,A Giassi ,A M Litke ,J Sommer ,F Saadi ,R W Clifft ,T.r Edgecock ,R Hagelberg ,C Bauer ,C Padilla ,M Talby ,R.m Turnbull ,A Minten ,F Foster ,D G Cassel ,W Zhao ,J Rander ,L M Bryant ,D Casper ,F Dydak ,J R Hansen ,W Witzeling ,S D Johnson ,J Wotschack ,E Fernández ,R Tanaka ,J M Yamartino ,F Combley ,U Becker ,H G Moser ,M Fernández-Bosman ,W Blum ,A Rosowsky ,E P Whelan ,A Barrès ,S J Haywood ,L Silvestris ,R Settles ,Rod Boswell ,D M Binnie ,S Wasserbaech ,J A Perlas ,U Stierlin ,G Bencivenni ,B Michel ,S L Cartwright ,A Valassi ,C Diaconu ,D E Jaffe ,J R Pater ,S Emery ,A Putzer ,G Rizzo ,S Orteu ,K Tittel ,J M Scarr ,I Lehraus ,S Simion ,G Hughes ,G Rudolph ,E Lançon ,J Lin ,J A Strong ,A Antonelli ,E Focardi ,G R Bonneaud ,C Markou ,J C Montret ,N Marinelli ,S Natali ,J Carr ,F Ligabue ,C Rankin ,G Capon ,A Rosado-Schlosser ,J M Rossignol ,A Moutoussi ,M Girone ,P Palazzi ,F Cerutti ,L Moneta ,G Rolandi ,G Giannini ,B Wolf ,M Jacquet ,H Schmidt ,E Locci ,F Etienne ,P S Marrocchesi ,G Lütjens ,T Fearnley ,R Miquel ,V Chiarella ,J Wear ,U Schäfer ,F Rivera ,Kevin M Smith ,G Musolino ,G Raso ,P Odier ,J.j Aubert ,S Bettarini ,D Rousseau ,G Zobernig

doi:10.1016/0370-2693(95)00248-j

Abstract

From a sample of 152,000 τ decays collected by the ALEPH detector at LEP an upper limit of 24 MeV at 95% CL on the τ neutrino mass has been determined. The limit is obtained using a two dimensional likelihood fit of the visible energy and the invariant mass distribution of 25 τ → 5 π( π 0) ν τ events.

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