The approximate symmetries of Quantum ChromoDynamics in the infinite heavy quark (Q=
c, b) mass limit (mQ→∞) and in the chiral limit for the light quarks (mq→ 0, q= u, d, s) can be …

We study the physics of spontaneously broken family symmetries acting on the third
generation. Massless familons (or Majorons) f associated with such broken symmetries are …

The hitherto unobserved purely leptonic decays B±→ τ±ν τ and B±→ μ±ν μ are of much
interest in current and future runs of the e+ e− B factories. Such decays are sensitive to …

Semileptonic decays are ideally suited to study the weak interaction as well as strong
interaction effects in B-meson decays. In the last decade, precision studies of semileptonic B …

The decays D∗→ Dπ and D∗→ Dγ are well described by heavy meson chiral perturbation
theory. With the recent measurement of B (D∗+→ D+ γ), the D∗ 0, D∗+ and D s∗ branching …

The recently measured B→ τν branching ratio allows to test the Standard Model by probing
virtual effects of new heavy particles, such as a charged Higgs boson. The accuracy of the …

We present searches for the leptonic decays B+→ ℓ+ ν and the lepton flavor violating decays
B 0→ ℓ±τ∓, where ℓ= e, μ, with data collected by the BABAR experiment at SLAC. This …

Using a data sample of 1 475 000 Z→ qq̄ (γ) events collected during 1994 with the L3
detector at LEP, we have studied the purely leptonic decays of heavy flavour mesons, D …

We report the results of a search for the decay B^ 0-> e^+ e^-, mu^+ mu^-and e^{+-} mu^{-+}
based on an analysis of 78 fb^{-1} of data collected by the Belle detector at KEKB. No …

We present a search for the decays B+→ μ+ νμ and B+→ e+ νe in a 253 fb− 1 data sample
collected at the ϒ (4S) resonance with the Belle detector at the KEKB asymmetric-energy B …