Publication

Precise Measurement of the Chromoelectric Dipole Moment of the Charm Quark

2026

Abstract

The combined symmetry of charge conjugation and parity (CP) is tested in the hadronic transition ψ(3686)→π+π-J/ψ, using a dataset of (2712.4±14.3)×106 ψ(3686) events collected by the BESIII detector at the BEPCII collider. The resulting asymmetry observable is ACP=(0.6±1.8±0.1)×10-4, which is determined by combining the two channels J/ψ→e+e- and J/ψ→μ+μ-. Additionally, by considering the relationship between the chromoelectric dipole moment (CEDM) and the ACP observable derived from the quantum chromodynamics multipole expansion theory based on the Chen-Kuang model and the Cornell potential model, we obtain the results of charm quark's CEDM with dc′=(2.6±7.8±0.4±0.6)×10-16 e cm, and dc′=(3.5±10.5±0.6±0.5)×10-16 e cm, respectively. The uncertainties are statistical, systematic, and theoretical, respectively. These results correspond to an upper limit of |dc′|

Official source

https://infoscience.epfl.ch/entities/publication/1e2ba795-78a1-4774-bb7d-3f8af10f1ec7

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2026

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/1e2ba795-78a1-4774-bb7d-3f8af10f1ec7

About this result

Related concepts (32)

C-symmetry

In physics, charge conjugation is a transformation that switches all particles with their corresponding antiparticles, thus changing the sign of all charges: not only electric charge but also the charges relevant to other forces. The term C-symmetry is an abbreviation of the phrase "charge conjugation symmetry", and is used in discussions of the symmetry of physical laws under charge-conjugation. Other important discrete symmetries are P-symmetry (parity) and T-symmetry (time reversal).

CP violation

In particle physics, CP violation is a violation of CP-symmetry (or charge conjugation parity symmetry): the combination of C-symmetry (charge symmetry) and P-symmetry (parity symmetry). CP-symmetry states that the laws of physics should be the same if a particle is interchanged with its antiparticle (C-symmetry) while its spatial coordinates are inverted ("mirror" or P-symmetry). The discovery of CP violation in 1964 in the decays of neutral kaons resulted in the Nobel Prize in Physics in 1980 for its discoverers James Cronin and Val Fitch.

C parity

In physics, the C parity or charge parity is a multiplicative quantum number of some particles that describes their behavior under the symmetry operation of charge conjugation. Charge conjugation changes the sign of all quantum charges (that is, additive quantum numbers), including the electrical charge, baryon number and lepton number, and the flavor charges strangeness, charm, bottomness, topness and Isospin (I3). In contrast, it doesn't affect the mass, linear momentum or spin of a particle.

Related publications (32)

Precise Measurement of the Chromoelectric Dipole Moment of the Charm Quark

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