Determination of the LEP centre-of-mass energy from Zγ events R Barate , D Decamp , P Ghez , C Goy , S Jezequel , J P Lees , F Martin , E Merle , M N Minard , B Pietrzyk , H Przysiezniak , R Alemany , M P Casado , M Chmeissani , J M Crespo , E Fernandez , M Fernandezbosman , L Garrido , E Grauges , A Juste , Maria Rosarys Martinez , Gabriel Merino , R Miquel , Ll M Mir , P Morawitz , A Pacheco , I C Park , I Riu , A Colaleo , D Creanza , M De Palma , G Iaselli , G Maggi , M Maggi , S Nuzzo , A Ranieri , G Raso , F Ruggieri , G Selvaggi , L Silvestris , P Tempesta , A Tricomi , G Zito , X Huang , Jie Lin , Qin Ouyang , Tao Wang , Y Xie , Rang Xu , Songbai Xue , Junjing Zhang , L Zhang , Weili Zhao , D Abbaneo , U Becker , G Boix , M Cattaneo , F Cerutti , V Ciulli , Gunther Dissertori , H Drevermann , R Forty , Marion E Frank , F Gianotti , T C Greening , A W Halley , J Harvey , P Janot , B Jost , I Lehraus , O Leroy , C Loomis , P Maley , P Mato , A Minten , A Moutoussi , F Ranjard , L Rolandi , D Schlatter , M Schmitt , O Schneider , Paolo Spagnolo , W Tejessy , F Teubert , I R Tomalin , E Tournefier , A E Wright , Z Ajaltouni , F Badaud , G Chazelle , O Deschamps , S Dessagne , A Falvard , C Ferdi , P Gay , C Guicheney , P Henrard , J Jousset , B Michel , S Monteil , J C Montret , D Pallin , P Perret , F Podlyski , J R Hansen , P H Hansen , B S Nilsson , B Rensch , A Waananen , G Daskalakis , A Kyriakis , C Markou , E Simopoulou , A Vayaki , A Blondel , J C Brient , F Machefert , A Rouge , M Swynghedauw , R Tanaka , A Valassi , H Videau , E Focardi , G Parrini , K Zachariadou , R Cavanaugh , M Corden , C Georgiopoulos , A Antonelli , G Bencivenni , G Bologna , F Bossi , P Campana , G Capon , V Chiarella , P Laurelli , G Mannocchi , F Murtas , G P Murtas , L Passalacqua , M Pepealtarelli , Michael J Chalmers , Lesley H Curtis , J G Lynch , P Negus , V Oshea , B Raeven , C Raine , D G Smith , P Teixeiradias , A S Thompson , J J Ward , O Buchmuller , S Dhamotharan , C Geweniger , P Hanke , G Hansper , V Hepp , E E Kluge , A Putzer , J Sommer , K Tittel , Stefan Werner , M Wunsch , R Beuselinck , D M Binnie , W Cameron , P J Dornan , M Girone , S Goodsir , N Marinelli , E B Martin , J Nash , J Nowell , A Sciaba , J K Sedgbeer , E Thomson , V M Ghete , P Girtler , E Kneringer , D Kuhn , G Rudolph , C K Bowdery , P G Buck , G Ellis , A J Finch , F S Foster , G Hughes , R W L Jones , N A Robertson , Maria Smizanska , M I Williams , I Giehl , F Holldorfer , K Jakobs , K Kleinknecht , M Krocker , A Muller , H A Nurnberger , G Quast , B Renk , E Rohne , H G Sander , S Schmeling , H Wachsmuth , C Zeitnitz , T Ziegler , J J Aubert , C Benchouk , A Bonissent , Jillian M Carr , P Coyle , A Ealet , D Fouchez , F Motsch , P Payre , David Rousseau , M Talby , M Thulasidas , A Tilquin , M Aleppo , M Antonelli , S Gilardoni , F Ragusa , V Buscher , H Dietl , G Ganis , K Huttmann , G Lutjens , C Mannert , W Manner , H G Moser , S Schael , R Settles , H Seywerd , H Stenzel , W Wiedenmann , G Wolf , P Azzurri , J Boucrot , O Callot , Shengliang Chen , M Davier , L Duflot , J F Grivaz , P Heusse , A Jacholkowska , M Kado , J Lefrancois , L Serin , J J Veillet , I Videau , J B De Vivie De Regie , D Zerwas , G Bagliesi , S Bettarini , T Boccali , C Bozzi , G Calderini , R Dellorso , I Ferrante , A Giassi , A Gregorio , F Ligabue , A Lusiani , P S Marrocchesi , A Messineo , F Palla , G Rizzo , G Sanguinetti , G Sguazzoni , R Tenchini , C Vannini , A Venturi , P G Verdini , G A Blair , J Coles , G Cowan , M G Green , D E Hutchcroft , L T Jones , T Medcalf , J A Strong , J H Von Wimmerspergtoeller , D R Botterill , R W Clifft , T R Edgecock , P R Norton , J C Thompson , B Blochdevaux , P Colas , B Fabbro , G Faif , E Lancon , M C Lemaire , E Locci , P Perez , J Rander , J F Renardy , A Rosowsky , A Trabelsi , B Tuchming , B Vallage , S N Black , J H Dann , Hye Young Kim , N Konstantinidis , A M Litke , M A Mcneil , G N Taylor , C N Booth , S Cartwright , F Combley , P Hodgson , M Kelly , M H Lehto , L F Thompson , K Affholderbach , A Bohrer , S Brandt , C Grupen , J Hess , A Misiejuk , G Prange , U Sieler , G Giannini , B Gobbo , J Putz , J Rothberg , S Wasserbaech , Robert W Williams , S R Armstrong , P Elmer , D Ferguson , Yanyan Gao , S Gonzalez , O J Hayes , H Hu , S Jin , P A Mcnamara , John E Nielsen , W Orejudos , Y B Pan , Y Saadi , I J Scott , J Walsh , Sau Lan Wu , Xiang Wu , G Zobernig PHYSICS LETTERS B（1999）
摘要
Radiative returns to the Z resonance (Z gamma events) are used to determine the LEP2 centre-of-mass energy from the data collected with the ALEPH detector in 1997. The average centre-of-mass energy is measured to he: E(CM) = 182.50 +/- 0.19(stat.) +/- 0.08 (syst.) GeV in good agreement with the precise determination by the LEP energy working group of 182.652 +/- 0.050 GeV. Lf applied to the measurement of the W mass. its precision translates into a systematic error on M(W), which is smaller than the statistical error achieved from the corresponding dataset. (C) 1999 Elsevier Science B.V. All rights reserved.
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