2019/02/28 by Feng-Kun Guo
Mathematics · Physics and Astronomy · #Antiproton #Computer science #Data mining #Geometry #Hadron #Mathematics #Measure (data warehouse) #Nuclear physics #Nuclear physics research studies #Particle physics #Particle physics theoretical and experimental studies #Physics #Proton #Quantum Chromodynamics and Particle Interactions #Singularity #X(3872) #hep-ex #hep-ph #nucl-ex #nucl-th
paper · pdf · doi:10.1103/physrevlett.122.202002
published as Phys. Rev. Lett. 122, 202002 (2019) · Version to be published in Phys. Rev. Lett
openalex created_date 2019/03/02 · arxiv created 2019/05/12 · openalex publication_date 2019/05/24 · arxiv updated 2019/05/28 · openalex updated_date 2026/08/05
The X(3872) is the first and the most interesting one amongst the abundant XYZ states. Its mass coincides exactly with the D0D[over ¯]*0 threshold with an uncertainty of 180 keV. Precise knowledge of its mass is crucial to understand the X(3872). However, whether it is above or below the D0D[over ¯]*0 threshold is still unknown. We propose a completely new method to measure the X(3872) mass precisely by measuring the X(3872)γ line shape between 4010 and 4020 MeV, which is strongly sensitive to the X(3872) mass relative to the D0D[over ¯]*0 threshold due to a triangle singularity. This method can be applied to experiments which produce copious D*0D[over ¯]*0 pairs, such as electron-positron, proton-antiproton, and other experiments, and may lead to much more precise knowledge of the X(3872) mass.