$${b\rightarrow c\tau \nu }$$ b → c τ ν transitions in the standard model effective field theory
نویسندگان
چکیده
منابع مشابه
Large ν μ → ν τ and ν e → ν τ transitions in short - baseline experiments ?
Considering four-neutrino schemes of type 3+1, we identify four small regions of the neutrino mixing parameter space compatible with all data. Assuming a small mixing between the sterile neutrino and the isolated mass eigenstate we show that large νμ → ντ and νe → ντ transitions are predicted in short-baseline experiments and could be observed in the near future in dedicated experiments. We dis...
متن کاملEffect of H ± on B ± → τ ± ν τ and D ± s → μ ± ν μ , τ ± ν τ
The recent observation of the purely leptonic decay B → τντ at the B factories permits a sizeable contribution from a charged Higgs boson (H). Such a H would also contribute to the decays D s → μ νμ and D ± s → τ ντ , which are being measured with increasing precision at CLEO-c. We show that the branching ratios of D s → μ νμ and D s → τ ντ could be suppressed by up to 10% from the Standard Mod...
متن کاملThe Decay B → π ` ν in Heavy Quark Effective Theory
We present a systematic analysis of the B(∗) → π ` ν weak decay form factors to order 1/mb in the heavy quark effective theory, including a discussion of renormalization group effects. These processes are described by a set of ten universal functions (two at leading order, and eight at order 1/mb), which are defined in terms of matrix elements of operators in the effective theory. In the soft p...
متن کاملThe Contribution of B c Mesons to the Search for B + → τ + ν τ Decays at LEP
We study the contribution of Bc mesons to the search for B → τντ decays. We find that at LEP the contributions from Bu and Bc mesons can be comparable. This observation can have a relevant impact on the extraction of constraints on new physics (such as chargedHiggs contributions) from current LEP limits on B → τν final states. Inclusion of the Bc contribution can reduce the current L3 limit on ...
متن کاملExperimental Results on | V cb | and b → c ν Transitions
A review of recent analyses on semileptonic decays of B mesons into charmed final states is given. |Vcb| is extracted both by the BABAR and the Belle collaboration from their datasets using inclusively and exclusively reconstructed final states. In addition there are recent results on the determination of exclusive branching fractions to the ground states D and D∗, as well as to excited D∗∗ sta...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The European Physical Journal C
سال: 2019
ISSN: 1434-6044,1434-6052
DOI: 10.1140/epjc/s10052-019-6766-8