The Mass and Leptonic Decay Constant of Ds0(2317) Meson in the framework of thermal QCD sum rules
Elsen Veli Veliev, Gulsah Kaya
备注：
11 pages, 6 figures, Talk at The XIII International Conference on Hadron Spectroscopy, 29 November-04 December 2009, Florida State University, Tallahassee, Florida, USA
In the present work, we assume D_{s0}(2317) meson as the c\bar{s} state and study its parameters at finite temperature using QCD sum rules. It is calculated the annihilation and scattering parts of spectral function in the lowest order of perturbation theory. Taking into account perturbative two-loop order α_{s} corrections and nonperturbative corrections up to the dimension six condensates it is investigated the temperature dependences of mass and leptonic decay constant of D_{s0}(2317) meson.
Cabibbo-suppressed non-leptonic B- and D-decays involving tensor mesons
采用Isgur-Scora-Grinstein-Wise的非相对论夸克模型，在因子分解假设下，计算了B（和D）介子到包含张量介子的末态的Cabibbo抑制的非轻子衰变.我们发现其中一些B衰变模式，如B ->（K^*，D^*）D^*_2，其分支比可达6 x 10^{-5}，这似乎是未来B工厂所能达到的。
Sterile neutrino and leptonic decays of the pseudoscalar mesons
我们考虑的情况下，只有一个无菌中微子$ N $，可以忽略不计的混合与活跃的中微子$ ν_{L} $，它与普通粒子的相互作用可以描述在一个模型独立的方法的基础上有效的理论。在此框架下，我们考虑了无菌中微子$N$对纯轻子衰变$ M \rightarrow lν$和$ ν\overlineν $以及辐射轻子衰变$ M \rightarrow lνγ$的贡献，其中$M$表示赝标介子$ B $，$ D $和$ K$ .我们发现，它可以产生显着的影响，这些罕见的衰变过程。
We study the wave functions and purely leptonic decays of $b$-flavored mesons (pseudoscalars, vector mesons, and higher excited states that are well established in experiment) in the relativistic potential model based on our previous works. The wave functions are obtained by solving the wave equation including the spin-spin and spin-orbit corrections in the effective potential. The decay constants of $B$, $B^*$ and some of their excited states that have been found in experiment are calculated with these wave functions. Then the branching fractions of the purely leptonic decay modes of these bo…
The theoretical calculation of pseudo-scalar leptonic decay widths into an invisible ALP, $M \to \ell\, ν_\ell\, a$, is reviewed. Assuming generic flavour-conserving ALP couplings to SM fermions and a generic ALP mass, $m_a$, the latest experimental results for pseudo-scalar leptonic decays are used to provide updated bounds on the ALP-fermion Lagrangian sector. Constrains on the ALP-quark couplings obtained from these channels are not yet competitive with the ones derived from FCNC processes, like $M\to P\,a$ decays. These leptonic decays can, however, provide the most stringent model-indepen…
In this paper we present a phenomenological analysis of the Partially Aligned Two Higgs Doublet Model (PA-2HDM) by using leptonic decays of mesons and $B^0_{d,s}$-$\bar B^0_{d,s}$ mixing. We focus our attention in a scenario where the leading contribution to FCNC is given by the tree level interaction with the light pseudoscalar $A^0$ ($M_{A^0}\sim 250$ GeV). We show how an underlying flavor symmetry controls FCNC in the quark and lepton couplings with the pseudoscalar, without alignment between Yukawa matrices. Upper bounds on the free parameters are calculated in the context of the leptonic …
Decay constants, semi-leptonic and non-leptonic decays in a Bethe-Salpeter Model
在Bethe-Salpeter模型中计算了B介子和$D$介子的衰变常数以及B介子到$D$和$D^*$介子的半轻子衰变的形状因子.从数据中，我们从${\bar B} \to D^* l {\barν} $中提取$V_{cb}=0.039 \pm 0.002$，从${\bar B} \to D l {\barν} $衰变中提取$V_{cb}=0.037 \pm 0.004$。然后使用形状因子在因子分解近似下获得$ B\to D π(K) $和$B \to D D (D_s) $的非轻子衰变部分宽度。
We entertain the option of scalar leptoquarks to explain the anomalies in the semi-leptonic decays of $B$-mesons and the discrepancies in the lepton $(g-2)_l$'s including the recent results at Fermilab E989. The $R_{K^{(*)}}$ and $R_{D^{(*)}}$ anomalies can be accommodated by the specific couplings for triplet and singlet leptoquarks, respectively, subject to the bounds from $B\to Kν{\barν}$. We discuss the correlation between the leptonic signatures from leptoquarks such as $μ\to eγ$ and the electric dipole moment of electron and show that desirable neutrino masses can be generated dominantly…
