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Quantifying Cytoskeleton Dynamics Using Differential Dynamic Microscopy

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Measurement of the D^{*}(2010)^{+}-D^{+} Mass Difference.

J P Lees¹, V Poireau¹, V Tisserand¹

¹Laboratoire d'Annecy-le-Vieux de Physique des Particules (LAPP), Université de Savoie, CNRS/IN2P3, F-74941 Annecy-Le-Vieux, France.

Physical Review Letters

|December 9, 2017

Summary

Researchers precisely measured the mass difference between D*+ and D+ mesons. This new measurement of the D+ meson mass difference offers a fivefold increase in precision compared to current averages.

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Area of Science:

Particle Physics
Hadron Spectroscopy

Background:

The D*+ and D+ mesons are crucial for understanding heavy quark dynamics.
Precise measurements of their mass difference provide stringent tests for theoretical models.

Purpose of the Study:

To measure the mass difference, Δm_{+}, between the D^{*}(2010)^{+} and D^{+} mesons.
To improve the precision of the D meson mass difference, Δm_{D}.

Main Methods:

Utilized data from the BABAR detector at center-of-mass energies at and near the ϒ(4S) resonance.
Analyzed the decay chain D^{*}(2010)^{+}→D^{+}π^{0} with D^{+}→K^{-}π^{+}π^{+} for approximately 468 fb^{-1} of integrated luminosity.

Main Results:

Measured Δm_{+} = (140601.0 ± 6.8[stat] ± 12.9[syst]) keV.
Determined the D meson mass difference Δm_{D} = (4824.9 ± 6.8[stat] ± 12.9[syst]) keV.

Conclusions:

The measured mass difference is compatible with previous results.
The precision of this measurement is approximately five times greater than the Particle Data Group averages, offering a significant advancement in the field.