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Novel Method for Precisely Measuring the X(3872) Mass.

Feng-Kun Guo1

  • 1CAS 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.

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|June 8, 2019
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Summary
This summary is machine-generated.

Researchers propose a new method to precisely measure the mass of the X(3872) exotic hadron. This technique focuses on the X(3872) photon line shape to determine its exact position relative to the D0D*0 threshold.

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Area of Science:

  • * Particle Physics
  • * Hadron Spectroscopy

Background:

  • * The X(3872) is a prominent exotic hadron state, with its mass near the D0D*0 threshold.
  • * Precise determination of the X(3872) mass is critical for understanding its nature.
  • * Its exact position relative to the D0D*0 threshold remains experimentally undetermined.

Purpose of the Study:

  • * To propose a novel method for precisely measuring the X(3872) mass.
  • * To resolve the ambiguity of whether the X(3872) lies above or below the D0D*0 threshold.

Main Methods:

  • * Analyzing the X(3872)γ line shape in the energy region of 4010–4020 MeV.
  • * Exploiting a triangle singularity to enhance sensitivity to the X(3872) mass relative to the D0D*0 threshold.

Main Results:

  • * The proposed method offers a new pathway to precisely determine the X(3872) mass.
  • * This technique is applicable to experiments producing abundant D*0D¯*0 pairs, such as electron-positron and proton-antiproton colliders.

Conclusions:

  • * The novel line shape analysis method promises significantly improved precision for the X(3872) mass measurement.
  • * This advancement will contribute to a deeper understanding of exotic hadron states and their properties.