OBSERVATION OF THE DECAY K+-]PI(+)GAMMA-GAMMA

Authors
KITCHING P NAKANO T ROZON M SOLUK R ADLER S ATIYA MS CHIANG IH FRANK JS HAGGERTY JS KYCIA TF LI KK LITTENBERG LS SAMBAMURTI A STEVENS A STRAND RC WITZIG C LOUIS WC AKERIB DS ARDEBILI M CONVERY M ITO MM MARLOW DR MCPHERSON RA MEYERS PD SELEN MA SHOEMAKER FC SMITH FC BLACKMORE EW BRYMAN DA FELAWKA L KONAKA A KUNO Y MACDONALD JA NUMAO T PADLEY P POUTISSOU JM POUTISSOU R ROY J TURCOT AS
Citation
P. Kitching et al., OBSERVATION OF THE DECAY K+-]PI(+)GAMMA-GAMMA, Physical review letters, 79(21), 1997, pp. 4079-4082
Citations number
14
Categorie Soggetti
Physics
Journal title
Physical review letters → ACNP
ISSN journal
00319007
Volume
79
Issue
21
Year of publication
1997
Pages
4079 - 4082
Database
ISI
SICI code
0031-9007(1997)79:21<4079:OOTDK>2.0.ZU;2-C
Abstract
The first observation of the decay K+ --> pi(+)gamma gamma is reported . A total of 31 events was observed with an estimated background of 5. 1 +/- 3.3 events in the pi(+) momentum range from 100 to 180 MeV/c. Th e corresponding partial branching ratio, B(K+ --> pi(+)gamma gamma, 10 0 MeV/c < Ppi+ < 180 MeV/c), is [6.0 +/- 1.5(stat) +/- 0.7(syst)] X 10 (-7). No K+ --> pi(+)gamma gamma decay was observed in the pi(+) momen tum region greater than 215 MeV/c. The observed pi(+) momentum spectru m is compared with the predictions of chiral perturbation theory.