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Resummed photon spectrum in radiative upsilon decays.
Sean Fleming1, Adam K Leibovich
1Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
Physical Review Letters
|February 7, 2003
Summary
We improved theoretical predictions for photon spectra in radiative upsilon decay. Our new method using nonrelativistic QCD and soft-collinear effective theory better matches experimental data.
Area of Science:
- High Energy Physics
- Quantum Chromodynamics
- Particle Physics
Background:
- Radiative upsilon decay is a key process for studying quark dynamics.
- Previous theoretical models, like leading-order nonrelativistic QCD (NRQCD), showed discrepancies with experimental photon spectrum data.
Purpose of the Study:
- To develop a more accurate theoretical prediction for the photon spectrum in radiative upsilon decay.
- To incorporate the effects of resumming the endpoint region of the photon energy spectrum.
Main Methods:
- Utilizing nonrelativistic Quantum Chromodynamics (NRQCD) framework.
- Applying soft-collinear effective theory (SCET) to handle the endpoint region.
- Performing theoretical calculations for the photon spectrum.
Main Results:
- The refined theoretical prediction shows significantly improved agreement with experimental data compared to previous leading-order NRQCD calculations.
- The inclusion of resummed endpoint effects is crucial for accurate spectral predictions.
Conclusions:
- The improved theoretical model provides a more precise description of radiative upsilon decay.
- This work highlights the importance of advanced theoretical techniques in particle physics phenomenology.