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Bounds on the width, mass difference and other properties of X(3872) -> pi(+)pi(-) J/psi decays
Belle Collaboration
2011
发表期刊PHYSICAL REVIEW D
卷号84期号:5
通讯作者Choi, SK (reprint author), Budker Inst Nucl Phys SB RAS, Novosibirsk 630090, Russia.
摘要We present results from a study of X(3872) -> pi pi J/psi decays produced via exclusive B -> KX(3872) decays. We determine the mass to be M-X(3872) = (3871.85 +/- 0.27(stat) +/- 0.19(syst)) MeV, a 90% confidence level upper limit on the natural width of Gamma(X(3872)) < 1.2 MeV, the product branching fraction B(B+ -> K+X(3872)) X B(X(3872) -> pi(+)pi(-) J/psi) = (8.63 +/- 0.82(stat) +/- 0.52(syst)) X 10(-6), and a ratio of branching fractions B(B-0 -> (KX)-X-0(3872))/B(B+ -> K+X(3872)) = 0.50 +/- 0.14(stat)) +/- 0.04(syst). The difference in mass between the X(3872) -> pi(+)pi(-) J/psi signals in B+ and B-0 decays is Delta M-X(3872) = (-0.71 +/- 0.96(stat) +/- 0.19(syst)) MeV. A search for a charged partner of the X(3872) in the decays <(B)over bar>(0) -> K-X+ or B+ -> (KX+)-X-0, X+ -> pi(+)pi(0) J/psi resulted in upper limits on the product branching fractions for these processes that are well below expectations for the case that the X(3872) is the neutral member of an isospin triplet. In addition, we examine possible J(PC) quantum number assignments for the X(3872) based on comparisons of angular correlations between final state particles in X(3872) -> pi(+)pi(-) J/psi decays with simulated data for J(PC) values of 1(++) and 2(-+). We examine the influence of rho-omega interference in the M(pi(+)pi(-)) spectrum. The analysis is based on a 711 fb(-1) data sample that contains 772 x 10(6) B (B) over bar meson pairs collected at the gamma(4S) resonance in the Belle detector at the KEKB e(+)e(-) collider.
关键词CHARMONIUM BELLE ANNIHILATION MESONS STATES
学科领域Astronomy & Astrophysics; Physics
DOI10.1103/PhysRevD.84.052004
收录类别SCI
语种英语
WOS类目Astronomy & Astrophysics ; Physics, Particles & Fields
WOS记录号WOS:000294643400003
引用统计
被引频次:101[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/311005/213105
专题实验物理中心
作者单位中国科学院高能物理研究所
推荐引用方式
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Belle Collaboration. Bounds on the width, mass difference and other properties of X(3872) -> pi(+)pi(-) J/psi decays[J]. PHYSICAL REVIEW D,2011,84(5).
APA Belle Collaboration.(2011).Bounds on the width, mass difference and other properties of X(3872) -> pi(+)pi(-) J/psi decays.PHYSICAL REVIEW D,84(5).
MLA Belle Collaboration."Bounds on the width, mass difference and other properties of X(3872) -> pi(+)pi(-) J/psi decays".PHYSICAL REVIEW D 84.5(2011).
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