Conveners
QCD and Heavy Flavours
- Diego Milanes Carreno (Universidad Nacional de Colombia (CO))
Very recently the LHCb experiment released the first measurement of the ratio $R(\Lambda_c)$. Moreover, the BABAR experiment reported a new result of the leptonic decay ratio of Upsilon meson $\Upsilon(3S)$, namely, $R_{\Upsilon(3S)}$. Both measurements are below their corresponding Standard Model predictions (deficit), deviating by \sim 1.1\sigma∼1.1σ and \sim 1.8\sigma∼1.8σ, respectively. In...
The triplet vector boson (TVB) is a simplified new physics model involving massive vector bosons transforming as a weak triplet vector, which it has been proposed as a combined explanation for the anomalous b→sμ+μ− and b→cτν¯τ data (the so-called B-meson anomalies). In this work, we carry out an updated view of the TVB model, including the Belle II perspectives. We perform a global fit to...
There is no Bc annihilation decay experimentally observed to date. The B_c -> Phi K+ decay can proceed via annihilation of anti-b and c quarks into a W intermediate boson or, alternatively, involving final-state rescattering effects. Observation of the B_c -> Phi K+ decay will provide a new insight on the B_c meson properties and will allow a new independent determination of the V_cb CKM...
There is no unique way of considering which one is the topology supposed to be the dominant one in decays such as $D^+_s \rightarrow K^+K^-K^+$ or $D^+ \rightarrow K^+K^-K^+$. There could be relevant contributions coming from either the radiation topology or the annihilation one. Meanwhile, there are extensive analyses of the annihilation topologies considering the weak vertex as a constant,...
We present the first observation of the $B^{+}$ meson production suppression in high-multiplicity respect to low multiplicity pPb collisions at $\sqrt{s_{NN}} = 8.16$ TeV with data collected by the CMS detector during 2016 and corresponding to an integrated luminosity of 175 nb$^{-1}$. The measurement uses exclusive decay channel $B^{+}\rightarrow J/\psi \ K^{+}$. The inclusive results show a...
Multiple fits were done with the run 2 of the LHCb data, to extract signal of
$B_s^0 \rightarrow \phi \phi \phi$ events via charmonia resonances. First, 3D
fits in the bins of the $B_s^0$ invariant mass were computed to get the
estimated number of true $\phi \phi \phi$ events. With a new histogram with the
resulting signal for each bin, a fit was applied, to extract the $B_s^0$
signal....
This work explores a holographic proposal to describe light nuclide spectroscopy by considering extensions to the well-known bottom-up AdS/QCD proposals, the hardwall and softwall models. We also propose an alternative description inspired by the Woods-Saxon potential. We find the static dilaton associated with this potential in this Wood-Saxon-like model. We compute the nuclide spectra...
A Peccei-Quinn~(PQ) symmetry is proposed, in order to generate in the standard Model~(SM) quark sector a realistic mass matrix ansatz with five texture-zeros. Limiting our analysis to Hermitian mass matrices we show that this requires a minimum of 4 Higgs doublets. This model allows assigning values close to 1 for several Yukawa couplings, giving insight into the origin of the mass scales in...
The biggest particle accelerators quantify the number of interactions with luminosity, the proportionality factor between the number of events per second and the cross section. For Run 3, LHCb experiment uses Allen software for High Level Trigger 1 (HLT1) developed on Graphics Processing Units (GPUs). The implementation of new trigger lines for luminosity measurements requires the development...
This work presents the selection of the $D^{+}\rightarrow K{-}K{+}K{+}$ candidates and progress in the amplitude analysis of this decay using the Multi-meson model (Triple-M), a model based on an effective chiral Lagrangian. The study is based on a sample of $pp$-collision data, collected at a centre-of-mass energy of 13 TeV with the LHCb detector between 2016 and 2018. The results of the...
Recent measurements on semi-leptonic decays of the B meson suggest a violation of lepton universality. This goes against the Standard Model prediction where none of its interactions distinguish lepton flavours. A posible explanation for this anomaly lies in the context of Beyond Standard Models. In this talk a model with new physics will be presented, which makes use of leptoquarks -...
