Bounds on the width, mass difference and other properties of X(3872) -> pi(+)pi(-) J/psi decays

	Bounds on the width, mass difference and other properties of X(3872) -> pi(+)pi(-) J/psi decays
	Belle Collaboration
刊名	PHYSICAL REVIEW D
	2011
卷号	84 期号:5
关键词	CHARMONIUM BELLE ANNIHILATION MESONS STATES
通讯作者	Choi, SK (reprint author), Budker Inst Nucl Phys SB RAS, Novosibirsk 630090, Russia.
英文摘要	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.
学科主题	Astronomy & Astrophysics; Physics
类目[WOS]	Astronomy & Astrophysics ; Physics, Particles & Fields
收录类别	SCI
语种	英语
WOS记录号	WOS:000294643400003
公开日期	2016-02-26
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/213105]
专题	高能物理研究所_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 GB/T 7714	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).