• Open Access

Novel Method for Precisely Measuring the X(3872) Mass

Feng-Kun Guo
Phys. Rev. Lett. 122, 202002 – Published 24 May 2019

Abstract

The X(3872) is the first and the most interesting one amongst the abundant XYZ states. Its mass coincides exactly with the D0D¯*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¯*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¯*0 threshold due to a triangle singularity. This method can be applied to experiments which produce copious D*0D¯*0 pairs, such as electron-positron, proton-antiproton, and other experiments, and may lead to much more precise knowledge of the X(3872) mass.

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  • Received 2 March 2019
  • Revised 3 April 2019

DOI:https://doi.org/10.1103/PhysRevLett.122.202002

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

Published by the American Physical Society

Physics Subject Headings (PhySH)

  1. Physical Systems
  1. Properties
Particles & Fields

Authors & Affiliations

Feng-Kun Guo*

  • CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China and School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China

  • *fkguo@itp.ac.cn

Article Text

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Issue

Vol. 122, Iss. 20 — 24 May 2019

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