New measurements of the η and K 0 masses A Lai , D Marras , J R Batley , A J Bevan , R S Dosanjh , T Gershon , G Kalmus , C Lazzeroni , D J Munday , E O Olaiya , M A Parker , T O White , S A Wotton , G Barr , G Bocquet , A Ceccucci , T Cuhadardonszelmann , D Cundy , G Dagostini , N Doble , V Falaleev , W Funk , L Gatignon , A Gonidec , B Gorini , G Govi , P Grafstrom , W Kubischta , A Lacourt , M Lenti , I Mikulec , A Norton , S Palestini , B Panzersteindel , D Schinzel , G Tatishvili , H Taureg , Mayda Velasco , H D Wahl , C Cheskov , P Hristov , V Kekelidze , D Madigojine , N Molokanova , Yu Potrebenikov , A Zinchenko , V Martin , P Rubin , R Sacco , A Walker , D Bettoni , R Calabrese , M Contalbrigo , P F Dalpiaz , J Duclos , P L Frabetti , A Gianoli , E Luppi , M Martini , L Masetti , F Petrucci , M Savrie , Marco Scarpa , A Bizzeti , M Calvetti , G Collazuol , G Graziani , E Iacopini , F Martelli , M Veltri , H G Becker , M Eppard , H Fox , A Hirstius , K Holtz , A Kalter , Konrad Kleinknecht , U Koch , L Kopke , P Lopes Da Silva , P Marouelli , I Mestvirishvili , I Pellmann , Andrew Peters , S A Schmidt , V Schonharting , Y Schue , R Wanke , A Winhart , M Wittgen , J C Chollet , L Fayard , L Iconomidoufayard , J Ocariz , G Unal , I Wingerterseez , G Anzivino , P Cenci , E Imbergamo , G Lamanna , P Lubrano , A Mestvirishvili , A Nappi , M Pepe , M Piccini , R Casali , C Cerri , M Cirilli , F Costantini , R Fantechi , L Fiorini , S Giudici , I Mannelli , G M Pierazzini , M Sozzi , J B Cheze , J Cogan , M De Beer , P Debu , F Derue , A Formica , G Gouge , R Granier De Cassagnac , G Marel , E Mazzucato , B Peyaud , R Turlay , B Vallage , M Holder , A Maier , M Ziolkowski , R Arcidiacono , C Biino , N Cartiglia , Roberto Guida , F Marchetto , E Menichetti , N Pastrone , J Nassalski , E Rondio , M Szleper , W Wislicki , S Wronka , H Dibon , M Jeitler , M Markytan , G Neuhofer , M Pernicka , A Taurok , L Widhalm Physics Letters B（2002）
摘要
New measurements of the η and K0 masses have been performed using decays to 3π0 with the NA48 detector at the CERN SPS. Using symmetric decays to reduce systematic effects, the results M(η)=547.843±0.051 MeV/c2 and M(K0)=497.625±0.031 MeV/c2 were obtained.
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