MEASUREMENT OF THE BRANCHING RATIO OF PI(0)-]E(-) FROM PI(0)S PRODUCED BY K(L)-]PI(0)PI(0)PI(0) DECAYS IN FLIGHT()E()

Authors
MCFARLAND KS BRIERE RA CHEU E HARRIS DA MAKOFF G ROODMAN A SCHWINGENHEUER B SOMALWAR SV WAH YW WINSTEIN B WINSTON R ARISAKA K ROBERTS D SLATER W WEAVER M BARKER AR SWALLOW EC BOCK GJ COLEMAN R CRISLER M ENAGONIO J FORD R HSIUNG YB JENSEN DA RAMBERG E TSCHIRHART R COLLINS EM GOLLIN GD NAKAYA T YAMANAKA T GU P HAAS P HOGAN WP KIM SK MATTHEWS JN MYUNG SS SCHNETZER S THOMSON GB ZOU Y
Citation
Ks. Mcfarland et al., MEASUREMENT OF THE BRANCHING RATIO OF PI(0)-]E(-) FROM PI(0)S PRODUCED BY K(L)-]PI(0)PI(0)PI(0) DECAYS IN FLIGHT()E(), Physical review letters, 71(1), 1993, pp. 31-34
Citations number
21
Categorie Soggetti
Physics
Journal title
Physical review letters → ACNP
ISSN journal
00319007
Volume
71
Issue
1
Year of publication
1993
Pages
31 - 34
Database
ISI
SICI code
0031-9007(1993)71:1<31:MOTBRO>2.0.ZU;2-#
Abstract
The Fermilab E799 Collaboration has carried out a search for the rare decay pi0 --> e+e- using pi0's produced from K(L) --> pi0pi0pi0 decays in flight. We observe a signal of nine events with an e+e-mass close to the pi0 mass where only one event is predicted from other known pro cesses. From this, we measure B(pi0 --> e+e-, (m(ee)/m(pi0))2 > 0.95) = [7.6(-2.8)+3.9(stat) +/- 0.5 (syst)] x 10(-8), over and above the co ntribution from pi0 Dalitz decays. Correcting for radiative effects, w e find this result consistent with theoretical expectations from stand ard-model processes.