Search for B 0 → π 0 π 0 decay M S Alam , S Ahmed , L Gibbons , B Gittelman , S W Gray , D L Hartill , B K Heltsley , M S Dubrovin , S Mcgee , G J Zhou , A Bornheim , E Lipeles , S P Pappas , P I Hopman , Liyueh Hsu , C D Jones , J Kandaswamy , D L Kreinick , M Lohner , A Magerkurth , T O Meyer , Gary E Gladding , J Ernst , B I Eisenstein , G D Gollin , R M Hans , E Johnson , I Karliner , M A Marsh , C Plager , C Sedlack , M Selen , J J Thaler , John C Williams , D G Cassel , V Boisvert , F Blanc , K Berkelman , B E Berger , C Bebek , K W Edwards , R Janicek , R G Baker , J P Alexander , A V Gritsan , Helmut Vogel , T Ferguson , G P Chen , R A Briere , R J Morrison , T S Hill , A Eppich , D M Asner , M Schmidtler , A Shapiro , W M Sun , A J Weinstein , D E Jaffe , R Mahapatra , G E Masek , H P Paar , P M Patel , A J Sadoff , R Ammar , A Bean , D Besson , Xiang Zhao , S Anderson , V V Frolov , Y Kubota , S J Lee , J J O Neill , R Poling , T Riehle , A Smith , C J Stepaniak , J Urheim , T Bergfeld , R J Wilson , D Y J Kim , A Ershov , G Brandenburg , J Yelton , H Stoeck , A I Rubiera , C Prescott , P Avery , A Warburton , G H A Viehhauser , B Valantspaight , D Urner , Alfonso Romano , D Riley , D Peterson , J R Patterson , M Palmer , E Nordberg , N B Mistry , Y Maravin , I Narsky , R Stroynowski , J Ye , T Wlodek , M Artuso , C Boulahouache , K Bukin , E Dambasuren , G Majumder , R Mountain , S Schuh , T Skwarnicki , S Stone , J C Wang , A Wolf , Jun Wu , S Kopp , M Kostin , A H Mahmood , S E Csorna , I Danko , K W Mclean , Zhengwen Xu , R Godang , G Bonvicini , D Cinabro , P S Drell , J E Duboscq , K M Ecklund , R Ehrlich , P Gaidarev , Y S Gao , V Fadeyev , T E Coan , E H Thorndike , A L Lyon , D Croninhennessy , V Pavlunin , I P J Shipsey , E I Shibata , D H Miller , J Lee , J W Hinson , J Fast , Shenjian Chen , V Savinov , A Undrus , P Skubic , H Severini , S J Richichi , M M Zoeller , E Von Toerne , J B Thayer , H Schwarthoff , T K Pedlar , R Kass , H Kagan , D Hufnagel , K Honscheid , T C Hart , C Gwon , K K Gan , E A Eckhart , A Anastassov , F R Wappler , S Timm , M Saleem , L Ling , L Jian , S B Athar Physical Review D（2002）
摘要
We have searched for the charmless hadronic decay of B0 mesons into two neutral pions. Using 9.13fb^-1 taken at the Upsilon(4S) with the CLEO detector, we obtain an improved upper limit for the branching fraction BR(B0-->pi0pi0) < 5.7*10^-6 at the 90% confidence level.
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