Study of exclusive B -> X(u)lv decays and extraction of vertical bar V-ub vertical bar using full reconstruction tagging at the Belle experiment
Belle Collaboration
刊名PHYSICAL REVIEW D
2013
卷号88期号:3
关键词MONTE-CARLO QUARK-MODEL IDENTIFICATION DETECTOR KEKB
学科分类Astronomy & Astrophysics; Physics
DOI10.1103/PhysRevD.88.032005
通讯作者Sibidanov, A (reprint author), Univ Sydney, Sch Phys, Sydney, NSW 2006, Australia.
英文摘要We report the results of a study of the exclusive semileptonic decays B- -> pi(0)l(-)(v) over bar (l), (B) over bar (0) -> pi(+)l(-)(v) over bar (l), B- -> rho(0)l(-)(v) over bar (l), (B) over bar (0) -> rho+l(-)(v) over bar (l) and B- -> omega l(-)(v) over bar (l), where l represents an electron or a muon. The events are tagged by fully reconstructing a second B meson in the event in a hadronic decay mode. The measured branching fractions are 'B(B- -> pi(0)l(-)(v) over bar (l)) = (0.80 +/- 0.08 +/- 0.04 x 10(-4), B((B) over bar (0) -> pi(0)l(-)(v) over bar (l)) = (1.49 +/- 0.09 +/- 0.07) x 10(-4), B(B- -> rho(0)l(-)(v) over bar (l)) = 1.83 +/- 0.10 +/- 0.10 x 10(-4), B((B) over bar (0) -> rho(0)l(-)(v) over bar (l) 3.22 +/- 0.27 +/- 0.24) x 10(-4), and B(B- -> omega l(-)(v) over bar (l)) = 1.07 +/- 0.16 +/- 0.07) x 10(-4), where the first error is statistical and the second one is systematic. The obtained branching fractions are inclusive of soft photon emission. We also determine the branching fractions as a function of the 4-momentum transfer squared to the leptonic system q(2) = (p(l) + p(v))(2), where p(l) and p(v) are the lepton and neutrino 4-momenta, respectively. Using the pion modes, a recent light cone sum rule calculation, latticeQCDresults and a model-independent description of the hadronic form factor, a value of the Cabibbo-Kobayashi-Maskawa matrix element vertical bar V-ub vertical bar (3.52 +/- 0.29) x 10(-3) is extracted. A structure in the two-pion invariant mass distribution near 1.3 GeV/c(2), which might be dominated by the decay B- -> f(2)(1270)l(-)(v) over bar (l), f(2) -> pi(+)pi(-), is seen. These results are obtained from a 711 fb(-1) data sample that contains 772 x 10(6) B (B) over bar pairs, collected near the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider.
类目[WOS]Astronomy & Astrophysics ; Physics, Particles & Fields
收录类别SCI
语种英语
WOS记录号WOS:000322814800001
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被引频次:52[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/213580
专题中国科学院高能物理研究所_实验物理中心_期刊论文
作者单位中国科学院高能物理研究所
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Belle Collaboration. Study of exclusive B -> X(u)lv decays and extraction of vertical bar V-ub vertical bar using full reconstruction tagging at the Belle experiment[J]. PHYSICAL REVIEW D,2013,88(3).
APA Belle Collaboration.(2013).Study of exclusive B -> X(u)lv decays and extraction of vertical bar V-ub vertical bar using full reconstruction tagging at the Belle experiment.PHYSICAL REVIEW D,88(3).
MLA Belle Collaboration."Study of exclusive B -> X(u)lv decays and extraction of vertical bar V-ub vertical bar using full reconstruction tagging at the Belle experiment".PHYSICAL REVIEW D 88.3(2013).
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