Observation of B{0}-->ppK*0 with a large K*0 polarization.
Using a 492 fb{-1} data sample collected near the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e{+}e{-} collider, we observe the decay B{0}-->ppK*0 with a branching fraction of (1.18{-0.25}{+0.29}(stat)+/-0.11(syst))x10{-6}. We study the decay dynamics of B{0}-->ppK*0 and compare with B{+}-->ppK*+. The K*0 meson is found to be almost 100% polarized (with a fraction of (101+/-13+/-3)% in the helicity zero state), while the K*+ meson has a (32+/-17+/-9)% fraction in the helicity zero state. The direct CP asymmetries for B{0}-->ppK*0 and B{+}-->ppK*+ are measured to be -0.08+/-0.20+/-0.02 and -0.01+/-0.19+/-0.02, respectively. In addition, we report improved measurements of the branching fractions B(B{+}-->ppK*+)=(3.38{-0.60}{+0.73}+/-0.39)x10{-6} and B(B{0}-->ppK{0})=(2.51{-0.29}{+0.35}+/-0.21)x10{-6}, which supersede our previous measurements.
Chen
J-H
JH
Department of Physics, National Taiwan University, Taipei.
Wang
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Adachi
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Aihara
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Arinstein
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Aulchenko
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Aushev
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Bakich
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Balagura
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Barberio
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Bay
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Bedny
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Belous
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Bitenc
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Bondar
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Bozek
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Bracko
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Browder
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Chang
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Chao
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Chen
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Chen
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Chistov
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Cho
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Dalseno
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Dash
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Drutskoy
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Eidelman
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Ha
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Haba
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Hara
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Hayasaka
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Hayashii
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Hazumi
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Heffernan
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Hoshi
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Hou
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Hsiung
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Hyun
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Inami
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Ishikawa
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Ishino
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Itoh
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Iwasaki
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Joshi
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Kim
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Kim
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Kim
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Kinoshita
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Krokovny
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Kumar
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Kuo
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Kwon
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Lee
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Medvedeva
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Miyata
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Miyazaki
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Nakao
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Nakazawa
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Natkaniec
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Nishida
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Nitoh
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Ogawa
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Ohshima
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Okuno
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Olsen
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Ozaki
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Pakhlov
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Park
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Park
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Shiu
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Singh
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Staric
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Sumiyoshi
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Takasaki
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Tanaka
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Taylor
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Teramoto
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Tikhomirov
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Trabelsi
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Uehara
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Ueno
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Urquijo
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Varner
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Vervink
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