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Production of excited beauty states in Z decays
ALEPH Collaboration
1996
发表期刊ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS
卷号69期号:3页码:#REF!
通讯作者Buskulic, D (reprint author), INST NATL PHYS NUCL & PHYS PARTICULES, CNRS, PHYS PARTICULES LAB, F-74019 ANNECY LE VIEUX, FRANCE.
文章类型Article
摘要A data sample of about 3.0 million hadronic Z decays collected by the ALEPH experiment at LEP in the years 1991 through 1994 is used to make an inclusive selection of B hadron events. In this event sample 4227 +/- 140 +/- 252 B* mesons in the decay B* --> B gamma and 1944 +/- 108 +/- 161 B-u,B-d** mesons decaying into a B meson and a charged pion are reconstructed. Here and in the following B-u,B-d** denotes the eight L = 1 (b (u) over bar and (b (d) over bar) states and their charge conjugate. For the well established B* meson the following quantities are obtained: Delta M = M(B)* - M(B) = (45.30 +/- 0.35 +/- 0.87) MeV/c(2) and N-B*/(N-B + N-B*) = (77.1 +/- 2.6 +/- 7.0)%. The angular distribution of the photons in the B* rest frame is used to measure the relative contribution of longitudinal B* polarization states to be sigma(L)/(sigma(L) + sigma(T)) = (33 +/- 6 +/- 5)%. In the M(B pi)- M(B) mass difference resonance structure is observed at (424 +/- 4 +/- 10) MeV/c(2), for which the shape and position is consistent with the expectation for B-u,B-d** states decaying into B(*)pi(+/-). The relative production rate is determined to be BR(Z --> b --> B-u,B-d**)/BR(Z --> b --> B-u,B-d) = [27.9 +/- 1.6(stat) +/- 5.9(syst) (+3.9)(-5.6)(model)]%. where the third error reflects the uncertainty due to different production and decay models for the broad B-u,B-d** States.
学科领域Physics
DOI10.1007/s002880050039
收录类别SCI
WOS类目Physics, Particles & Fields
WOS记录号WOS:A1996TR76700003
引用统计
被引频次:68[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/311005/227616
专题实验物理中心
推荐引用方式
GB/T 7714
ALEPH Collaboration. Production of excited beauty states in Z decays[J]. ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS,1996,69(3):#REF!.
APA ALEPH Collaboration.(1996).Production of excited beauty states in Z decays.ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS,69(3),#REF!.
MLA ALEPH Collaboration."Production of excited beauty states in Z decays".ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS 69.3(1996):#REF!.
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