Details

Autor(en) / Beteiligte

• Wei, J-T
• Chang, P
• Adachi, I
• Aulchenko, V
• Aushev, T
• Bakich, A M
• Balagura, V
• Barberio, E
• Bozek, A
• Bracko, M
• Browder, T E
• Chang, Y-W
• Chao, Y
• Chen, K-F
• Cheon, B G
• Chiang, C-C
• Cho, I-S
• Dalseno, J
• Drutskoy, A
• Dungel, W
• Eidelman, S
• Gabyshev, N
• Golob, B
• Han, B-Y
• Hayashii, H
• Hazumi, M
• Hoshi, Y
• Hou, W-S
• Hyun, H J
• Inami, K
• Itoh, R
• Iwasaki, M
• Iwasaki, Y
• Kah, D H
• Kaji, H
• Kang, J H
• Kapusta, P
• Katayama, N
• Kim, H J
• Kim, S K
• Kim, Y I
• Kinoshita, K
• Ko, B R
• Korpar, S
• Kuzmin, A
• Kwon, Y-J
• Lee, M J
• Lee, S E
• Lesiak, T
• Liu, C
• Louvot, R
• Mandl, F
• Matyja, A
• Miyata, H
• Miyazaki, Y
• Nakano, E
• Nakao, M
• Nakazawa, H
• Natkaniec, Z
• Nishida, S
• Nishimura, K
• Nitoh, O
• Ogawa, S
• Ozaki, H
• Park, H
• Piilonen, L E
• Sahoo, H
• Sakai, K
• Schwanda, C
• Schwartz, A J
• Sekiya, A
• Senyo, K
• Sevior, M E
• Shapkin, M
• Shen, C P
• Stanic, S
• Staric, M
• Sumiyoshi, T
• Suzuki, S
• Tanaka, M
• Taylor, G N
• Trabelsi, K
• Uglov, T
• Unno, Y
• Uno, S
• Urquijo, P
• Varvell, K E
• Vervink, K
• Wang, C C
• Wang, M-Z
• Wang, X L
• Watanabe, Y
• Wedd, R
• Wicht, J
• Won, E
• Yamashita, Y
• Yuan, C Z
• Zhang, Z P
• Zivko, T
• Zyukova, O

Titel

Measurement of the differential branching fraction and forward-backward asymmetry for B --> K()l+l

Ist Teil von

• Physical review letters, 2009-10, Vol.103 (17), p.171801-171801, Article 171801

Ort / Verlag

United States

Erscheinungsjahr

2009

Quelle

PROLA

Beschreibungen/Notizen

• We study B --> K(*)l+l- decays (l = e, mu) based on a data sample of 657 x 10(6) BB pairs collected with the Belle detector at the KEKB e+e- collider. We report the differential branching fraction, isospin asymmetry, K* polarization, and the forward-backward asymmetry (A(FB)) as functions of q2 = M(ll)(2)c2. The fitted A(FB) spectrum exceeds the standard model expectation by 2.7 standard deviations. The measured branching fractions are B(B --> K*l+l-) = (10.7(-1.0)(+1.1) +/- 0.9) x 10(-7) and B(B --> Kl+l-) = (4.8(-0.4)(+0.5) +/- 0.3) x 10(-7), where the first errors are statistical and the second are systematic, with the muon to electron ratios R(K*) = 0.83 +/- 0.17 +/- 0.08 and R(K) = 1.03 +/- 0.19 +/- 0.06.