Determination of Strong-Phase Parameters in D→K_{S,L}^{0}π^{+}π^{-}.

Area of Science:

• Particle Physics
• High Energy Physics
• Quantum Chromodynamics

Background:

• Precise determination of the Cabibbo-Kobayashi-Maskawa (CKM) angle gamma/phi3 is essential for testing the Standard Model of particle physics.
• Strong phase parameters in D0 and anti-D0 decays are critical inputs for model-independent measurements of gamma/phi3.
• Previous measurements of these strong phases lacked the required precision.

Purpose of the Study:

• To report the most precise measurements to date of strong-phase parameters in D0 and anti-D0 decays to K0 pi+pi-.
• To provide key inputs for a precise, model-independent determination of the CKM angle gamma/phi3.
• To enhance future flavor physics investigations, including charm mixing and CP violation studies.

Main Methods:

• Analysis of 2.93 fb^-1 of e+e- annihilation data collected at 3.773 GeV center-of-mass energy.
• Utilized the BESIII detector at the BEPCII collider.
• Employed a binned model-independent approach for data analysis.

Main Results:

• Achieved the most precise measurements to date of strong-phase parameters for D0 and anti-D0 decays to K0 pi+pi-.
• The sensitivity to gamma/phi3 measurements is expected to improve by a factor of three compared to previous studies.
• The precision of these results ensures that gamma/phi3 measurements will not be limited by strong phase uncertainties for the next decade.

Conclusions:

• The reported precise strong-phase parameters are crucial for advancing the measurement of the CKM angle gamma/phi3.
• This work significantly reduces uncertainties in flavor physics, impacting studies of CP violation and charm mixing.
• The findings pave the way for more precise tests of the Standard Model in the flavor sector.