Zobrazeno 1 - 10
of 292
pro vyhledávání: '"Matias, Joaquim"'
We study penguin-mediated $\bar{B}_{d(s)}\to\bar{K}^{*0}(K^{*0})\phi$ transitions, proposing a new optimised observable $L_{K^*\phi}$ from the ratio of the corresponding branching ratios of these decays, with limited hadronic uncertainties and enhanc
Externí odkaz:
http://arxiv.org/abs/2404.01186
We propose a set of new optimized observables using penguin mediated $\bar{B}_d$ and $\bar{B}_s$ decays: ${\bar B}_{d,s} \to K^{*0} \bar{K}^{*0}$, ${\bar B}_{d,s} \to K^{0} \bar{K}^{0}$, ${\bar B}_{d,s} \to K^{0} \bar{K}^{*0}$ and ${\bar B}_{d,s} \to
Externí odkaz:
http://arxiv.org/abs/2309.11179
Publikováno v:
Eur. Phys. J. Spec. Top. (2023) 1-20
We review the current status and implications of the anomalies (i.e. deviations from the Standard Model predictions) in semi-leptonic $B$ meson decays, both in the charged and in the neutral current. In $b\to s\ell^+\ell^-$ transitions significant te
Externí odkaz:
http://arxiv.org/abs/2309.01311
We present a model based on $S_1$ scalar leptoquarks to solve the tension observed in the recently proposed non-leptonic optimized observables $L_{K^{*} \bar{K}^{*}}$ and $L_{K \bar{K}}$. These observables are constructed as ratios of U-spin related
Externí odkaz:
http://arxiv.org/abs/2306.09178
Autor:
Algueró, Marcel, Biswas, Aritra, Capdevila, Bernat, Descotes-Genon, Sébastien, Matias, Joaquim, Novoa-Brunet, Martín
We discuss the impact of the recent LHCb update on the two lepton-flavour universality ratios $R_K$ and $R_{K^*}$, and the CMS update of $B({B_s \to \mu^+\mu^-})$ regarding the possibility of New Physics in $b\to s\ell^+\ell^-$ decays. We perform glo
Externí odkaz:
http://arxiv.org/abs/2304.07330
This contribution to the XVth Quark Confinement and the Hadron Spectrum conference covers a description, both theoretical and experimental, of the present status of a set of very different anomalies. The discussion ranges from the long standing $b \t
Externí odkaz:
http://arxiv.org/abs/2211.13030
In this letter we propose a strategy for discerning if new physics in the Wilson coefficient ${\cal C}_{9\mu}$ is dominantly lepton flavour universality violating or if it contains a sizable lepton flavour universal component (${\cal C}_9^{\rm U}$).
Externí odkaz:
http://arxiv.org/abs/2205.15212
Autor:
Crivellin, Andreas, Matias, Joaquim
In recent years, exciting (indirect) hints for physics beyond the Standard Model (SM) have been accumulated. In particular, semi-leptonic $B$ decays show deviations from the SM predictions, which, due to the ratios $R(K^{(*)})$ and $R(D^{(*)})$ are o
Externí odkaz:
http://arxiv.org/abs/2204.12175
Autor:
Matias Joaquim Culpa, Denise Oliveira e Silva, Nathália Paula de Souza, Alessandro Henrique da Silva Santos, André Luiz Sá de Oliveira, Eduarda Ângela Pessoa Cesse
Publikováno v:
Revista Brasileira de Saúde Materno Infantil, Vol 24 (2024)
Abstract Objectives: to describe the prevalence of malnutrition (underweight, low height, and overweight) in children aged six to 59 months and its spatial distribution in the city of Beira, Mozambique. Methods: an exploratory cross-sectional study w
Externí odkaz:
https://doaj.org/article/91678b24c21b46759e8ce96cf353da51
The discrepancies between the measurements of rare (semi-)leptonic $B$ decays and the corresponding Standard Model predictions point convincingly towards the existence of new physics for which a heavy neutral gauge boson ($Z^\prime$) is a prime candi
Externí odkaz:
http://arxiv.org/abs/2201.08170