Measuring the photon polarization in B -->Kpipigamma

Area of Science:

• Particle Physics
• High Energy Physics
• Quantum Mechanics

Background:

• Radiative B decays are crucial for testing the Standard Model (SM).
• Understanding K resonance states and their decays provides insights into fundamental interactions.
• Photon polarization measurements offer a sensitive probe of underlying physics.

Purpose of the Study:

• To propose a novel method for measuring photon polarization in radiative B decays into K resonance states.
• To establish a technique for testing the Standard Model and searching for new physics beyond it.
• To determine the feasibility of such measurements at current experimental facilities.

Main Methods:

• The study proposes measuring photon polarization via the up-down asymmetry of the photon's direction.
• This asymmetry is analyzed in the rest frame of the K resonance decaying into Kpipi.
• The method focuses on radiative B decays, specifically targeting K resonance states.

Main Results:

• The integrated asymmetry for the K1(1400)-->Kpipi decay is calculated within the Standard Model.
• The predicted asymmetry value is 0.34 ± 0.05.
• This asymmetry is demonstrated to be experimentally measurable at existing B factories.

Conclusions:

• The proposed method provides a viable way to measure photon polarization in radiative B decays.
• This measurement serves as a powerful tool for Standard Model tests and new physics searches.
• The feasibility of the measurement at current B factories makes it experimentally accessible.