title: Study of J/psi-->pp[over],LambdaLambda[over] and observation of eta(c)-->LambdaLambda[over] at Belle.
abstract: We study the baryonic charmonium decays of B mesons B+-->etacK+ and B+-->J/psiK+, where the etac and J/psi subsequently decay into a pp[over] or LambdaLambda[over] pair. We measure the J/psi-->pp[over] and LambdaLambda[over] anisotropy parameters alphaB=-0.60+/-0.13+/-0.14 (pp[over]), -0.44+/-0.51+/-0.31 (LambdaLambda[over ]) and compare to results from e;{+}e;{-}-->J/psi formation experiments. We also report the first observation of etac-->LambdaLambda[over]. The measured branching fraction is B(etac-->LambdaLambda[over ])=(0.87(+0.24)/(-0.21)(stat)(+0.09/-0.14) (syst)+/-0.27(PDG))x10-3. This study is based on a 357 fb-1 data sample recorded on the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+ e- collider.
authors.affiliation: Department of Physics, National Taiwan University, Taipei, Taiwan.
authors.forename: C-H
authors.initials: CH
authors.lastname: Wu
authors.forename: M-Z
authors.initials: MZ
authors.lastname: Wang
authors.forename: K
authors.initials: K
authors.lastname: Abe
authors.forename: I
authors.initials: I
authors.lastname: Adachi
authors.forename: H
authors.initials: H
authors.lastname: Aihara
authors.forename: V
authors.initials: V
authors.lastname: Aulchenko
authors.forename: T
authors.initials: T
authors.lastname: Aushev
authors.forename: S
authors.initials: S
authors.lastname: Bahinipati
authors.forename: A M
authors.initials: AM
authors.lastname: Bakich
authors.forename: V
authors.initials: V
authors.lastname: Balagura
authors.forename: A
authors.initials: A
authors.lastname: Bay
authors.forename: K
authors.initials: K
authors.lastname: Belous
authors.forename: U
authors.initials: U
authors.lastname: Bitenc
authors.forename: I
authors.initials: I
authors.lastname: Bizjak
authors.forename: S
authors.initials: S
authors.lastname: Blyth
authors.forename: A
authors.initials: A
authors.lastname: Bondar
authors.forename: A
authors.initials: A
authors.lastname: Bozek
authors.forename: T E
authors.initials: TE
authors.lastname: Browder
authors.forename: Y
authors.initials: Y
authors.lastname: Chao
authors.forename: A
authors.initials: A
authors.lastname: Chen
authors.forename: W T
authors.initials: WT
authors.lastname: Chen
authors.forename: B G
authors.initials: BG
authors.lastname: Cheon
authors.forename: Y
authors.initials: Y
authors.lastname: Choi
authors.forename: Y K
authors.initials: YK
authors.lastname: Choi
authors.forename: A
authors.initials: A
authors.lastname: Chuvikov
authors.forename: S
authors.initials: S
authors.lastname: Cole
authors.forename: J
authors.initials: J
authors.lastname: Dalseno
authors.forename: M
authors.initials: M
authors.lastname: Danilov
authors.forename: M
authors.initials: M
authors.lastname: Dash
authors.forename: S
authors.initials: S
authors.lastname: Eidelman
authors.forename: N
authors.initials: N
authors.lastname: Gabyshev
authors.forename: T
authors.initials: T
authors.lastname: Gershon
authors.forename: A
authors.initials: A
authors.lastname: Go
authors.forename: G
authors.initials: G
authors.lastname: Gokhroo
authors.forename: A
authors.initials: A
authors.lastname: Gorisek
authors.forename: H
authors.initials: H
authors.lastname: Ha
authors.forename: J
authors.initials: J
authors.lastname: Haba
authors.forename: K
authors.initials: K
authors.lastname: Hayasaka
authors.forename: H
authors.initials: H
authors.lastname: Hayashii
authors.forename: M
authors.initials: M
authors.lastname: Hazumi
authors.forename: D
authors.initials: D
authors.lastname: Heffernan
authors.forename: T
authors.initials: T
authors.lastname: Hokuue
authors.forename: S
authors.initials: S
authors.lastname: Hou
authors.forename: W-S
authors.initials: WS
authors.lastname: Hou
authors.forename: Y B
authors.initials: YB
authors.lastname: Hsiung
authors.forename: T
authors.initials: T
authors.lastname: Iijima
authors.forename: K
authors.initials: K
authors.lastname: Inami
authors.forename: A
authors.initials: A
authors.lastname: Ishikawa
authors.forename: R
authors.initials: R
authors.lastname: Itoh
authors.forename: M
authors.initials: M
authors.lastname: Iwasaki
authors.forename: Y
authors.initials: Y
authors.lastname: Iwasaki
authors.forename: J H
authors.initials: JH
authors.lastname: Kang
authors.forename: S U
authors.initials: SU
authors.lastname: Kataoka
authors.forename: N
authors.initials: N
authors.lastname: Katayama
authors.forename: H
authors.initials: H
authors.lastname: Kawai
authors.forename: T
authors.initials: T
authors.lastname: Kawasaki
authors.forename: H R
authors.initials: HR
authors.lastname: Khan
authors.forename: H
authors.initials: H
authors.lastname: Kichimi
authors.forename: H J
authors.initials: HJ
authors.lastname: Kim
authors.forename: H O
authors.initials: HO
authors.lastname: Kim
authors.forename: Y J
authors.initials: YJ
authors.lastname: Kim
authors.forename: P
authors.initials: P
authors.lastname: Krizan
authors.forename: P
authors.initials: P
authors.lastname: Krokovny
authors.forename: R
authors.initials: R
authors.lastname: Kulasiri
authors.forename: R
authors.initials: R
authors.lastname: Kumar
authors.forename: C C
authors.initials: CC
authors.lastname: Kuo
authors.forename: A
authors.initials: A
authors.lastname: Kuzmin
authors.forename: Y-J
authors.initials: YJ
authors.lastname: Kwon
authors.forename: G
authors.initials: G
authors.lastname: Leder
authors.forename: J
authors.initials: J
authors.lastname: Lee
authors.forename: Y-J
authors.initials: YJ
authors.lastname: Lee
authors.forename: T
authors.initials: T
authors.lastname: Lesiak
authors.forename: S-W
authors.initials: SW
authors.lastname: Lin
authors.forename: D
authors.initials: D
authors.lastname: Liventsev
authors.forename: G
authors.initials: G
authors.lastname: Majumder
authors.forename: F
authors.initials: F
authors.lastname: Mandl
authors.forename: T
authors.initials: T
authors.lastname: Matsumoto
authors.forename: A
authors.initials: A
authors.lastname: Matyja
authors.forename: S
authors.initials: S
authors.lastname: McOnie
authors.forename: W
authors.initials: W
authors.lastname: Mitaroff
authors.forename: K
authors.initials: K
authors.lastname: Miyabayashi
authors.forename: H
authors.initials: H
authors.lastname: Miyake
authors.forename: H
authors.initials: H
authors.lastname: Miyata
authors.forename: Y
authors.initials: Y
authors.lastname: Miyazaki
authors.forename: R
authors.initials: R
authors.lastname: Mizuk
authors.forename: T
authors.initials: T
authors.lastname: Mori
authors.forename: E
authors.initials: E
authors.lastname: Nakano
authors.forename: M
authors.initials: M
authors.lastname: Nakao
authors.forename: Z
authors.initials: Z
authors.lastname: Natkaniec
authors.forename: S
authors.initials: S
authors.lastname: Nishida
authors.forename: O
authors.initials: O
authors.lastname: Nitoh
authors.forename: S
authors.initials: S
authors.lastname: Ogawa
authors.forename: T
authors.initials: T
authors.lastname: Ohshima
authors.forename: T
authors.initials: T
authors.lastname: Okabe
authors.forename: S
authors.initials: S
authors.lastname: Okuno
authors.forename: S L
authors.initials: SL
authors.lastname: Olsen
authors.forename: Y
authors.initials: Y
authors.lastname: Onuki
authors.forename: H
authors.initials: H
authors.lastname: Ozaki
authors.forename: P
authors.initials: P
authors.lastname: Pakhlov
authors.forename: H
authors.initials: H
authors.lastname: Palka
authors.forename: H
authors.initials: H
authors.lastname: Park
authors.forename: K S
authors.initials: KS
authors.lastname: Park
authors.forename: R
authors.initials: R
authors.lastname: Pestotnik
authors.forename: L E
authors.initials: LE
authors.lastname: Piilonen
authors.forename: Y
authors.initials: Y
authors.lastname: Sakai
authors.forename: T
authors.initials: T
authors.lastname: Schietinger
authors.forename: O
authors.initials: O
authors.lastname: Schneider
authors.forename: A J
authors.initials: AJ
authors.lastname: Schwartz
authors.forename: R
authors.initials: R
authors.lastname: Seidl
authors.forename: M E
authors.initials: ME
authors.lastname: Sevior
authors.forename: M
authors.initials: M
authors.lastname: Shapkin
authors.forename: H
authors.initials: H
authors.lastname: Shibuya
authors.forename: V
authors.initials: V
authors.lastname: Sidorov
authors.forename: A
authors.initials: A
authors.lastname: Sokolov
authors.forename: A
authors.initials: A
authors.lastname: Somov
authors.forename: N
authors.initials: N
authors.lastname: Soni
authors.forename: S
authors.initials: S
authors.lastname: Stanic
authors.forename: M
authors.initials: M
authors.lastname: Staric
authors.forename: H
authors.initials: H
authors.lastname: Stoeck
authors.forename: T
authors.initials: T
authors.lastname: Sumiyoshi
authors.forename: F
authors.initials: F
authors.lastname: Takasaki
authors.forename: M
authors.initials: M
authors.lastname: Tanaka
authors.forename: G N
authors.initials: GN
authors.lastname: Taylor
authors.forename: Y
authors.initials: Y
authors.lastname: Teramoto
authors.forename: X C
authors.initials: XC
authors.lastname: Tian
authors.forename: T
authors.initials: T
authors.lastname: Tsuboyama
authors.forename: T
authors.initials: T
authors.lastname: Tsukamoto
authors.forename: S
authors.initials: S
authors.lastname: Uehara
authors.forename: T
authors.initials: T
authors.lastname: Uglov
authors.forename: K
authors.initials: K
authors.lastname: Ueno
authors.forename: S
authors.initials: S
authors.lastname: Uno
authors.forename: P
authors.initials: P
authors.lastname: Urquijo
authors.forename: Y
authors.initials: Y
authors.lastname: Usov
authors.forename: G
authors.initials: G
authors.lastname: Varner
authors.forename: C C
authors.initials: CC
authors.lastname: Wang
authors.forename: C H
authors.initials: CH
authors.lastname: Wang
authors.forename: Y
authors.initials: Y
authors.lastname: Watanabe
authors.forename: E
authors.initials: E
authors.lastname: Won
authors.forename: B D
authors.initials: BD
authors.lastname: Yabsley
authors.forename: A
authors.initials: A
authors.lastname: Yamaguchi
authors.forename: Y
authors.initials: Y
authors.lastname: Yamashita
authors.forename: L M
authors.initials: LM
authors.lastname: Zhang
authors.forename: Z P
authors.initials: ZP
authors.lastname: Zhang