Radiative Penguin and Leptonic Rare Decays at BaBar

TL;DR

This paper presents recent BaBar experimental results on rare B meson decays involving flavor-changing neutral currents and leptonic final states, including measurements of CP asymmetries, branching fractions, and decay limits.

Contribution

It provides new experimental measurements and updated limits on rare B decay processes, enhancing understanding of flavor physics and testing the Standard Model predictions.

Findings

New CP asymmetry measurements in B decays

Updated branching fraction for B -> K* gamma

Limits on B -> mu nu decay

Abstract

Recent BaBar results on rare B decays involving flavour-changing neutral currents or purely leptonic final states are presented. New measurements of the CP asymmetries in B -> K* gamma, B -> K*2(1430) gamma, and b -> s gamma are reported, as well as a new measurement of the B -> K* gamma branching fraction. Also reported are updated limits on B -> mu nu and recent measurements of B -> K* l+ l- and b -> s l+ l-. The data sample comprises 123 10^6 Y4S -> B Bbar decays collected with the BaBar detector at the PEP-II e+e- storage ring.