Measurement of the differential branching fraction and forward-backward asymmetry for B --> K(*)l+l-.
Measurement of the differential branching fraction and forward-backward asymmetry for B --> K(*)l+l-.
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DOI：
10.1103/physrevlett.103.171801
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发表时间：
2008-10
影响因子：
8.6
通讯作者：
J. T. Wei;P. Chang;I. Adachi;H. Aihara;V. Aulchenko;V. Aulchenko;T. Aushev;A. Bakich;V. Balagura;E. Barberio;A. Bondar;A. Bondar;A. Bozek;M. Bračko;T. Browder;Yu-Wei Chang;Y. Chao;A. Chen;Kai-Feng Chen;B. Cheon;C. Chiang;I. Cho;Y. Choi;J. Dalseno;A. Drutskoy;W. Dungel;S. Eidelman;S. Eidelman;N. Gabyshev;N. Gabyshev;P. Goldenzweig;B. Golob;H. Ha;B. Han;K. Hayasaka;H. Hayashii;M. Hazumi;Y. Horii;Y. Hoshi;W. Hou;H. Hyun;T. Iijima;K. Inami;R. Itoh;M. Iwasaki;Y. Iwasaki;D. Kah;H. Kaji;J. Kang;P. Kapusta;N. Katayama;T. Kawasaki;H. Kichimi;H. Kim;H. Kim;S. Kim;Y. I. Kim;Y. Kim;K. Kinoshita;B. Ko;S. Korpar;P. Križan;P. Krokovny;A. Kuzmin;A. Kuzmin;Y. Kwon;S. Kyeong;J. Lange;M. Lee;S. Lee;T. Lesiak;J. Li;A. Limosani;C. Liu;D. Liventsev;R. Louvot;F. Mandl;A. Matyja;S. Mconie;T. Medvedeva;K. Miyabayashi;H. Miyata;Y. Miyazaki;R. Mizuk;E. Nakano;M. Nakao;H. Nakazawa;Z. Natkaniec;S. Nishida;K. Nishimura;O. Nitoh;T. Nozaki;S. Ogawa;T. Ohshima;S. Okuno;H. Ozaki;G. Pakhlova;C. Park;H. Park;H. Park;K. Park;L. Piilonen;M. Różańska;H. Sahoo;K. Sakai;Y. Sakai;O. Schneider;C. Schwanda;A. Schwartz;R. Seidl;A. Sekiya;K. Senyo;M. Sevior;M. Shapkin;C. Shen;J. Shiu;B. Shwartz;B. Shwartz;S. Stanič;M. Starič;T. Sumiyoshi;S. Suzuki;M. Tanaka;G. Taylor;Y. Teramoto;K. Trabelsi;S. Uehara;T. Uglov;Y. Unno;S. Uno;P. Urquijo;Y. Usov;Y. Usov;G. Varner;K. Varvell;K. Vervink;C. C. Wang-C.;C. H. Wang;M. Wang;P. Wang;X. Wang;Y. Watanabe;R. Wedd;J. Wicht;E. Won;B. Yabsley;Y. Yamashita;M. Yamauchi;C. Yuan;Z. Zhang;T. Živko;A. Zupanc;O. Zyukova;O. Zyukova
中科院分区：
文献类型：
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作者：
J. T. Wei;P. Chang;I. Adachi;H. Aihara;V. Aulchenko;V. Aulchenko;T. Aushev;A. Bakich;V. Balagura;E. Barberio;A. Bondar;A. Bondar;A. Bozek;M. Bračko;T. Browder;Yu-Wei Chang;Y. Chao;A. Chen;Kai-Feng Chen;B. Cheon;C. Chiang;I. Cho;Y. Choi;J. Dalseno;A. Drutskoy;W. Dungel;S. Eidelman;S. Eidelman;N. Gabyshev;N. Gabyshev;P. Goldenzweig;B. Golob;H. Ha;B. Han;K. Hayasaka;H. Hayashii;M. Hazumi;Y. Horii;Y. Hoshi;W. Hou;H. Hyun;T. Iijima;K. Inami;R. Itoh;M. Iwasaki;Y. Iwasaki;D. Kah;H. Kaji;J. Kang;P. Kapusta;N. Katayama;T. Kawasaki;H. Kichimi;H. Kim;H. Kim;S. Kim;Y. I. Kim;Y. Kim;K. Kinoshita;B. Ko;S. Korpar;P. Križan;P. Krokovny;A. Kuzmin;A. Kuzmin;Y. Kwon;S. Kyeong;J. Lange;M. Lee;S. Lee;T. Lesiak;J. Li;A. Limosani;C. Liu;D. Liventsev;R. Louvot;F. Mandl;A. Matyja;S. Mconie;T. Medvedeva;K. Miyabayashi;H. Miyata;Y. Miyazaki;R. Mizuk;E. Nakano;M. Nakao;H. Nakazawa;Z. Natkaniec;S. Nishida;K. Nishimura;O. Nitoh;T. Nozaki;S. Ogawa;T. Ohshima;S. Okuno;H. Ozaki;G. Pakhlova;C. Park;H. Park;H. Park;K. Park;L. Piilonen;M. Różańska;H. Sahoo;K. Sakai;Y. Sakai;O. Schneider;C. Schwanda;A. Schwartz;R. Seidl;A. Sekiya;K. Senyo;M. Sevior;M. Shapkin;C. Shen;J. Shiu;B. Shwartz;B. Shwartz;S. Stanič;M. Starič;T. Sumiyoshi;S. Suzuki;M. Tanaka;G. Taylor;Y. Teramoto;K. Trabelsi;S. Uehara;T. Uglov;Y. Unno;S. Uno;P. Urquijo;Y. Usov;Y. Usov;G. Varner;K. Varvell;K. Vervink;C. C. Wang-C.;C. H. Wang;M. Wang;P. Wang;X. Wang;Y. Watanabe;R. Wedd;J. Wicht;E. Won;B. Yabsley;Y. Yamashita;M. Yamauchi;C. Yuan;Z. Zhang;T. Živko;A. Zupanc;O. Zyukova;O. Zyukova
我们基于KEKB e+e对撞机上贝儿探测器收集的657 × 10（6）个BB对的数据样本研究了B --> K（*）l+l-衰变（l = e，μ）。我们报告的微分分支分数，同位旋不对称性，K* 极化，和前向后不对称性（A（FB））的函数q2 = M（II）（2）c2。拟合的A（FB）光谱超过标准模型预期2.7个标准差。测得的支化分数为B（B --> K*l+l-）=（10.7（-1.0））（+1.1）+/- 0.9）x 10（-7）和B（B --> Kl+l-）=（4.8）（-0.4）（+0.5）+/- 0.3）× 10（-7），其中第一个误差是统计误差，第二个误差是系统误差，其中μ子与电子的比率R（K*）= 0.83 +/- 0.17 +/- 0.08和R（K）= 1.03 +/- 0.19 +/- 0.06。
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.