Observation of a Narrow Near-Threshold Structure in the $J/\psi\phi$ Mass Spectrum in $B^+\to J/\psi\phi K^+$ Decays [electronic resource]

• Ngôn ngữ: eng
• Ký hiệu phân loại: 539.7 Atomic and nuclear physics
• Thông tin xuất bản: Batavia, Ill. : Oak Ridge, Tenn. : Fermi National Accelerator Laboratory ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2010
• Mô tả vật lý: Size: 4 pages : , digital, PDF file.
• Bộ sưu tập: Metadata
• ID: 268558
• Chủ đề: 1. 72 physics of elementary particles and fields; 2. B plus mesons; 3. Kaons plus; 4. Morphology; 5. Particle decay

Tóm tắt

Observation is reported for a structure near the J/{psi}{phi} threshold in B{sup +} {yields} J/{psi}{phi}K{sup +} decays produced in {bar p}p collisions at {radical}s = 1.96 TeV with a statistical significance of beyond 5 standard deviations. There are 19 {+-} 6 events observed for this structure at a mass of 4143.4{sub -3.0}{sup +2.9}(stat) {+-} 0.6(syst) MeV/c{sup 2} and a width of 15.3{sub -6.1}{sup +10.4}(stat) {+-} 2.5(syst) MeV/c{sup 2}, which are consistent with the previous measurements reported as evidence of the Y(4140).