This research paper investigates the potential of the rare decay Bc → B1'γ to reveal new physics beyond the Standard Model (SM) in the context of flavor-changing neutral current (FCNC) transitions.
Bibliographic Information: Losacco, N. (2024). Exclusive c → uγ transitions of Bc meson. arXiv preprint arXiv:2410.17616.
Research Objective: The study aims to determine if the Bc → B1'γ decay channel offers a cleaner environment to study the rare c → uγ transition and potential new physics contributions compared to the previously studied Bc → B*γ decay.
Methodology: The authors employ a model-independent approach based on heavy quark spin symmetry to analyze the short-distance and long-distance contributions to the decay amplitudes of both Bc → B1'γ and Bc → B*γ. They utilize existing form factor calculations from lattice QCD and light-cone QCD sum rules to estimate the hadronic matrix elements involved.
Key Findings: The study reveals a significant hadronic suppression in the short-distance amplitude of the Bc → B1'γ decay due to a cancellation between contributing terms. This suppression, absent in the Bc → B*γ mode, reduces the sensitivity of the Bc → B1'γ channel to potential new physics effects.
Main Conclusions: While the Bc → B1'γ decay might experience fewer contaminations from long-distance effects compared to Bc → B*γ, the hadronic suppression in its short-distance amplitude makes it less ideal for probing new physics in the c → uγ transition. The Bc → B*γ channel, despite being more affected by long-distance contributions, remains a more promising avenue for new physics searches.
Significance: This research contributes to the field of particle physics phenomenology by providing a detailed analysis of the Bc → B1'γ decay and its potential for new physics searches. It highlights the importance of considering hadronic effects when studying rare decays and emphasizes the need for precise theoretical calculations to disentangle new physics signals from SM background.
Limitations and Future Research: The study relies on certain assumptions and approximations in calculating the decay amplitudes. Future research could explore these aspects further by employing more refined theoretical tools and incorporating experimental data to constrain the model parameters. Additionally, investigating other decay channels involving the c → uγ transition could provide complementary information and further our understanding of this rare process.
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by Nicola Losac... at arxiv.org 10-24-2024
https://arxiv.org/pdf/2410.17616.pdfDeeper Inquiries